We Need Your Feedback on QGIS Documentation!

Changelog for QGIS 3.0

image1

Release date: 2018-02-23

The greatest QGIS release ever! QGIS 3.0 is a huge overhaul and cleanup of our beloved Open Source GIS. QGIS 3.0 brings a massive list of new changes - the highlights of which we will try to cover here. As always can we remind you that QGIS is an open source project and if you are able to, consider supporting our work through donations, sponsorship or contributions to the code documentation, web site and so on.

Thanks

We would like to thank the developers, documenters, testers and all the many folks out there who volunteer their time and effort (or fund people to do so). From the QGIS community we hope you enjoy this release! If you wish to donate time, money or otherwise get involved in making QGIS more awesome, please wander along to qgis.org and lend a hand!

QGIS is supported by donors and sponsors. A current list of donors who have made financial contributions large and small to the project can be seen on our donors list. If you would like to become and official project sponsor, please visit our sponsorship page for details. Sponsoring QGIS helps us to fund our six monthly developer meetings, maintain project infrastructure and fund bug fixing efforts. A complete list of current sponsors is provided below - our very great thank you to all of our sponsors!

QGIS is Free software and you are under no obligation to pay anything to use it - in fact we want to encourage people far and wide to use it regardless of what your financial or social status is - we believe empowering people with spatial decision making tools will result in a better society for all of humanity.

Sponsors for QGIS version 3.0

Large

Medium

Small

Feature: Remove dxf2shp converter plugin

This functionality is available in OGR and there is no longer a need for a dedicated QGIS plugin to do this task

Feature: Remove orphaned oracle raster plugin

Feature: remove TauDEM provider from core Processing

TauDEM is quite specific set of tools and it requires installation of some additional tools. So we decide to turn it into separate provider, reducing core codebase size and maintenance efforts.

Feature: More help and possibility to configure location of the QGIS help files

More Help buttons for algorithms and dialogs are added and now pointing to the online QGIS Documentation.

Configuration allows to access context help stored online, in the organization network or on local computer. Also it is possible to combine different help sources.

image112

This feature was developed by Alexander Bruy

Feature: Migrate Photo, WebView and FileName widgets to Attachment

image113

Feature: Removed otb and lidartools providers from processing

The new logic will be to develop plugin providers that will be able to follow the external software lifecycle.

User Interface

Feature: Enable tabbed floating docks

For qt > 5.6 builds, it is possible to drop several floating docks in the same floating window where they appear as tabs https://woboq.com/blog/qdockwidget-changes-in-56.html

image66

Feature: Add support for fine-resolution mouse wheel zooming

Some mouse / pointer devices (notably on mac) have finer resolutions. They send mouse wheel events at a high frequency but with smaller delta values. Zooming with such devices was unusable for fast zoom actions. This has been fixed in 3.0.

This feature was developed by Matthias Kuhn

Feature: add search bar to the Configure Shortcuts dialog

Supports search by action name and by shortcut

image67

This feature was developed by Alexander Bruy

Feature: Locator bar

The Locator bar is a fast, always ready, generic and pluggable search facility in the Left Bottom corner of QGIS.

Currently it is able to search for algorithms, actions and layer names, but also to select a feature in current active layer by typing an attribute value.

It is 'easy' extendable, so everybody can create a QgsLocatorFilter for his/her national geocoding service or other search online or database search facility.

image68

This feature was developed by Nyall Dawson

Feature: More non-blocking, inline editing

  • map unit scaling
  • color brewer and limited random ramp editors
  • editing colors in a color list inline in the style panel
  • inline editing of colors and symbols in composer

now shown inline in style panel

Feature: Add an option to show user color schemes menus

This adds the ability for users to set whether a user created color scheme should show up in the color button drop-down menus.

It's accessed through the color picker dialog, on the lists tab. Just add a new color scheme, then from the scheme menu tick the new "show in buttons" option.

This is handy if you have sets of common palettes and want them to be instantly available through the color menu.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Color setting for map canvas north arrow decoration

Color setting has been added for all map canvas north arrow decoration.

image69

This feature was developed by Mathieu Pellerin

Feature: Improved map canvas' save as image

The map canvas' save as image function has been expanded and now offers users the possibility to tweak the scale, resolution, and extent on-the-fly. Extents can be restricted to a height-width ratio. A save as PDF function was also added to quickly export the map canvas into a resolution-independent PDF.

image70

This feature was funded by Andreas Neumann (partial funding)

This feature was developed by Mathieu Pellerin

Feature: Toggle visibility of opened panels in main window

Accessible via: - View menu > Toggle Panels Visibility - Ctrl+Tab keyboard shortcut

image71

This feature was developed by Mathieu Pellerin

Feature: Improved consistency to the user interface

This work sponsored by the QGIS grant program on "adding consistency to UI controls" is now complete and merged into master. The following tasks were done as part of this work:

  • All API regarding transparency/opacity/alpha was standardised to setOpacity() and opacity(). The methods take a double value between 0 (transparent) and 1 (opaque), keeping consistency with the Qt API.
  • A new widget QgsOpacityWidget was created, and is now used everywhere through the UI where opacity is set. This ensures consistent behavior and look for opacity controls everywhere.
  • Rotation has been standardised in the API and UI, so now rotation is always applied clockwise. All rotation widgets have been updated so they accept values from -360 to 360.
  • 2.x Projects with labeling using rotation and data defined rotation are transparently upgraded upon opening in 3.0
  • Scale APIs have been made consistent throughout the QGIS API. The confusing mix of scale denominators vs real scales has been removed, with everything now operating on scale denominators. The behaviour of all scale range calls is standardised with a common meaning for min/max scales (and explicit api documentation regarding this)
  • All scale controls now use the standard scale widgets for consistency across the UI
  • Labeling now uses the same definition for min/max scale as the rest of the UI, and existing projects are transparently upgraded on opening in 3.0.
  • Fixed most outstanding bugs relating to scale usage, including bugs breaking the rule based scale limits

Thanks to the QGIS PSC and project donors for sponsoring this work and allowing it to proceed!

This feature was funded by QGIS Sponsors and Donors

This feature was developed by Nyall Dawson

Feature: Open layers in a single group

If you try to open many sublayers, you can now open them all within a same group in the legend.

image72

This feature was funded by Kartoza

This feature was developed by Etienne Trimaille

3D Features

Feature: 3D map view and terrain generation

We have a brand new native 3D map view in QGIS! The 3D map view displays 2D map (rendered from project layers) on top terrain. By default the terrain is a flat plane, but it is possible to use raster layers with digital elevation model as the source of height data.

Use menu View > New 3D Map View to add a 3D view of the project. This will create a new dock widget with 3D map canvas. The 3D view uses the same controls like 2D map views to browse the map using mouse (drag map to move it around, mouse wheel to zoom) or keyboard arrow keys. In addition there are camera controls specific to 3D views: it is possible to rotate and tilt camera by one of the following ways:

  • by dragging the mouse with middle mouse button pressed
  • by pressing Shift and dragging the mouse with left mouse button pressed
  • by pressing Shift and using up/down/left/right keys

image121

This feature was funded by QGIS.ORG

This feature was developed by Martin Dobias (Lutra Consulting)

Feature: 3D renderers for map layers

In the default configuration, map layers are rendered into 2D map images on top of the terrain. It is however possible to make better use of the 3D world by configuring 3D renderers for some map layers. With 3D renderers, the data can be displayed in 3D views as true 3D objects - this is currently supported for vector layers (all geometry types - point, line or polygon). This enables much better visualization, for example:

  • polygons with building footprints may be extruded (possibly with data-defined height) to achieve 3D look
  • points with tree point locations can be rendered with 3D symbols of trees (simple geometric shapes or existing 3D models loaded from a supported file format)

To configure 3D renderers, use layer styling dock widget or the vector layer properties dialog - there is a new tab for configuration of 3D renderers.

image122

This feature was funded by QGIS.ORG

This feature was developed by Martin Dobias, Peter Petrik (Lutra Consulting)

Expressions

Feature: New expression variables

Adds @project_crs and @project_crs_definition variables for retrieving the current project CRS

Feature: new global expression variable @qgis_locale

Returns current locale used by QGIS. By default this is current system locale. If user enabled locale override in QGIS settings overriden locale will be returned.

image63

This feature was developed by Alexander Bruy

Feature: New expression variables for map settings 

- map_crs, map_crs_definition: retrieves crs details for map
- map_units: retrieves units for map (eg 'meters','degrees')

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New expression functions

Atlas expressions

  • atlas_layerid and atlas_layername: Returns layer ID and layer name of the current layer in the atlas.

Aggregate expressions

  • array_agg(expression, group_by, filter): Returns an array of aggregated values from a field or expression.

Array expressions

New group that contains expression functions for the creation and manipulation of arrays (also known as list data structures). The order of values within the array matters, in contrary to the 'map' data structure, where the order of key-value pairs is irrelevant and values are identified by their keys.

  • array(value1, value2, …) : Returns an array containing all the values passed as parameter.
  • array_append(array, value): Returns an array with the given value added at the end.
  • array_cat(array1, array2, …): Returns an array containing all the given arrays concatenated.
  • array_contains(array, value): Returns true if an array contains the given value.
  • array_distinct(array): Returns an array containing distinct values of the given array.
  • array_find(array, value): Returns the index (0 for the first one) of a value within an array. Returns -1 if the value is not found.
  • array_first(array): Returns the first value of an array.
  • array_get(array, index): Returns the Nth value (0 for the first one) of an array.
  • array_insert(array, pos, value): Returns an array with the given value added at the given position.
  • array_intersect(array1, array2): Returns true if any element of array1 exists in array2.
  • array_last(array): Returns the last value of an array.
  • array_length(array): Returns the number of elements of an array.
  • array_prepend(array, value): Returns an array with the given value added at the beginning.
  • array_remove_all(array, value): Returns an array with all the entries of the given value removed.
  • array_remove_at(array, pos): Returns an array with the given index removed.
  • array_reverse(array): Returns the given array with array values in reversed order.
  • array_slice(array, start_pos, end_pos): Returns a portion of the array. The slice is defined by the start_pos and end_pos arguments.
  • array_to_string(array, delimiter, empty_value): Concatenates array elements into a string separated by a delimiter using and optional string for empty values.
  • regexp_matches(string, regex, empty_value): Returns an array of all strings captured by capturing groups, in the order the groups themselves appear in the supplied regular expression against a string.
  • string_to_array(string, delimiter, empty_value): Splits string into an array using supplied delimiter and optional string for empty values.

Color expressions

  • create_ramp(map, discrete): Returns a gradient ramp from a map of color strings and steps.

Date and Time expressions

  • epoch(date): Return the interval in milliseconds between the unix epoch and a given date value.

General expressions

  • env(name): Gets an environment variable and returns its content as a string. If the variable is not found, NULL will be returned.
  • raster_statistic(layer, band, property): Returns statistics from a raster layer. Properties: min/max/avg/range/stdev/sum
  • with_variable(name, value, node): This function sets a variable for any expression code that will be provided as 3rd argument. This is only useful for complicated expressions, where the same calculated value needs to be used in different places.

Geometry expressions

  • extend(geometry, start_distance, end_distance): Extends linestrings by a specified amount at the start and end of the line
  • hausdorff_distance(geometry a, geometry b, densify_fraction): Returns the Hausdorff distance between two geometries. This is basically a measure of how similar or dissimilar 2 geometries are, with a lower distance indicating more similar geometries.
  • inclination(inclination(point_a, point_b): Returns the inclination measured from the zenith (0) to the nadir (180) on point_a to point_b.
  • make_circle(center, radius, segment): Creates a circular, segmentized, polygon.
  • make_ellipse(center, semi_major_axis, semi_minor_axis, azimuth, segment): Creates an elliptical, segmentized, polygon.
  • make_regular_polygon(center, radius, number_sides, circle): Creates a regular polygon.
  • make_triangle(): help still missing
  • minimal_circle(geometry, segment): Returns the minimal enclosing circle of a geometry. It represents the minimum circle that encloses all geometries within the set.
  • offset_curve(geometry, distance, segments, join, miter_limit): Returns a geometry formed by offsetting a linestring geometry to the side. Distances are in the Spatial Reference System of this geometry.
  • oriented_bbox(geom): Returns a geometry which represents the minimal oriented bounding box of an input geometry.
  • pole_of_inaccessibility(geometry, tolerance): Calculates the approximate pole of inaccessibility for a surface, which is the most distant internal point from the boundary of the surface. This function uses the 'polylabel' algorithm (Vladimir Agafonkin, 2016), which is an iterative approach guaranteed to find the true pole of inaccessibility within a specified tolerance.
  • simplify(geometry, tolerance): Simplifies a geometry by removing nodes using a distance based threshold (ie, the Douglas Peucker algorithm). The algorithm preserves large deviations in geometries and reduces the number of vertices in nearly straight segments.
  • simplify_vw(geometry, tolerance): Simplifies a geometry by removing nodes using an area based threshold (the Visvalingam-Whyatt algorithm). The algorithm removes vertices which create small areas in geometries, e.g., narrow spikes or nearly straight segments.
  • smooth(geometry, iterations, offset, min_length, max_angle): Smooths a geometry by adding extra nodes which round off corners in the geometry.
  • single_sided_buffer(geometry, distance, segments, join, miter_limit): Returns a geometry formed by buffering out just one side of a linestring geometry. Distances are in the Spatial Reference System of this geometry.

Layer Property

  • crs_description returns the CRS description of the layer.

Map Expressions

This group contains expression functions for the creation and manipulation of 'map' data structures (also known as dictionary objects, key-value pairs, or associative arrays). One can assign values to given keys. The order of the key-value pairs in the map object is not relevant.

  • map(key1, value1, key2, value2, , …): Returns a map containing all the keys and values passed as pair of parameters.
  • map_akeys(map): Returns all the keys of a map as an array.
  • map_avals(map): Returns all the values of a map as an array.
  • map_concat(map1, map2, …): Returns a map containing all the entries of the given maps. If two maps contain the same key, the value of the second map is taken.
  • map_delete(map, key): Returns a map with the given key and its corresponding value deleted.
  • map_exist(map, key): Returns true if the given key exists in the map.
  • map_get(map, key): Returns the value of a map, given it's key.
  • map_insert(map, key, value): Returns a map with an added key/value.

Map Layers

New group that contains a list of map layers available in the current project. Returns internal map layer ids. This is used in many other expression functions that reference map layers.

Math expressions

  • inclination(point_a, point_b): Returns the inclination measured from the zenith (0) to the nadir (180) on point_a to point_b.

Operators

  • ~: Performs a regular expression match on a string value.

Record and Attributes Expressions

renamed from just "Record"

  • get_feature_by_id(layer, feature_id): Returns the feature with an id on a layer.
  • is_selected(feature, layer): Returns if a feature is selected. If called with no parameters checks the current feature.
  • num_selected(layer): Returns the number of selected features on a given layer. By default works on the layer on which the expression is evaluated.
  • represent_value(value, fieldName): Returns the configured representafftion value for a field value. It depends on the configured widget type. Often, this is useful for 'Value Map' widgets.
  • uuid(): Generates a Universally Unique Identifier (UUID) for each row using the Qt QUuid::createUuid method. Each UUID is 38 characters long.

Relations

New group listing all available table relations in a project. Useful for relation_aggregate functions.

Deprecated

  • $scale: old variable to get current map scale. Replaced by maps_scale

Changes

  • Change in substr() function
    • support negative start value (e.g. substr('hello',-2) returns 'lo')
    • support negative length value (e.g. substr('hello',3,-1) returns 'll')
    • length parameter now optional, defaults to end of string (e.g. substr('hello world',7) returns 'world')
  • strpos() now relies on a simple string within a string search
  • regexp_match() now returns pos of a matching regular expression

This feature was developed by numerous developers

Feature: Expose @parent variable in aggregate functions

This makes it possible to access attributes and geometry from the parent feature when in the filter of the "aggregate" expression function. With this in place aggregates can be calculated per feature.

E.g. max "measurement" for each point_station per polygon_research_area.

Or a default attribute value when digitizing features:

aggregate(layer:='countries', aggregate:='max', expression:=\"code\", filter:=intersects( $geometry, geometry(@parent) ) )

image64

This feature was developed by Matthias Kuhn (OPENGIS.ch)

Feature: Item_variables expression function inside compositions

This adds a new item_variables expression function when expressions are used inside a composition context.

The function takes a single argument, the id for an item inside the composition, and returns a map of variable name to value for that item. This allows you to do things like insert text in a label fetching properties of another item in the composition, eg

Insert scale of map into a label:

map_get( item_variables( 'map'),'map_scale')

Insert x coordinate of map center into a label:

x(map_get( item_variables( 'map'),'map_extent_center'))

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Documentation

Feature: Processing algorithms enhancements

Processing algorithms have been reviewed and documented. Clicking the Help button will open the QGIS website and show the algorithm description with enhanced documentation and pictures.

image65

This feature was funded by QGIS Grant Proposal

This feature was developed by Matteo Ghetta (Faunalia), Alexander Bruy

Symbology

Feature: Data defined symbol layer visibility

Adds a data defined override to control a symbol layer's visibility. Allows users to disable drawing certain symbol layers for matching features.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: save and restore color ramp used for singleband pseudocolor rendering

This feature was developed by Alexander Bruy

Feature: Add Points and Inches to available symbol units

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New color ramp button widget

In QGIS 3.0, handling of color ramps has gotten much better via a newly introduced color ramp button widget. Improvements include: - custom color ramp settings are remembered when projects are re-opened - color ramp inversion is implemented within the widget, enabling this action across QGIS - quick access to "favorite" color ramps within the widget pop-up menu - interfacing with catalogs (cpt-city and ColorBrewer) is now much more pleasant

image73

This feature was developed by Mathieu Pellerin

Feature: Style management re-work and upgrade

Style management has received a major upgrade. The improvements include:

  • A new favorite grouping system was added, which the symbols list widget defaults to
  • The selected tag / smartgroup in the symbols list widget now persists when switching layers (and across sessions)
  • The symbols list widget will update the tag / smartgroup combo box when users add / rename / remove categories
  • Users can now directly tag, as well as add to favorites, symbols while saving those to the style database
  • To streamline style management, groups have been removed and fully replaced by tags
  • Tags have been integrated into the import/export user interface

image74

This feature was developed by Mathieu Pellerin

Feature: Support setting of color and transparency on multiple items for raster renderers

It is now possible to change the color and transparency for multiple values at the same time for the singleband pseudocolor and the paletted renderers. Simply select values within the values' list and right click to have a pop-up menu appear.

image75

This feature was developed by Mathieu Pellerin

Feature: Show an alpha slider in color button drop down menu

Allows quick tweaks to the color alpha

image76

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Raster stretch toolbar actions support for pseudocolor renderer

This feature was developed by Mathieu Pellerin

Feature: Transparency support for paletted renderer

In QGIS 3.0, it is now possible to change the transparency value for unique values for the paletted renderer.

image77

This feature was developed by Mathieu Pellerin

Feature: raster auto-stretching when updating canvas

see https://lists.osgeo.org/pipermail/qgis-developer/2016-September/044393.html follow up to raster pseudocolor updated extent auto classification.

This feature was developed by Even Rouault

Feature: Control over annotation contents margins

Allows setting left/top/right/bottom margins for the contents within an annotation.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Annotations can be styled using fill symbol styles

This changes the rendering of annotation frames to use QGIS' symbology engine, which means that all the existing fill styles can now be used to style annotation frames.

Also paint effects & data defined symbol parameters.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Point cluster renderer

New symbol renderer that groups nearby points into a single rendered marker symbol. Optionally, a label displays the number of features that have been aggregated into the single symbol.

Additionally, some improvements have been made to the point displacement renderer, specifically:

  • points are now assigned to the group which is "nearest" them, rather then just assigning them first group within the search distance. In some cases this was assigning features to a more distant cluster, resulting in less predictable cluster patterns
  • individual points are now correctly shown in their own selection state
  • lots of code cleanup + documentation too.

For developers: QgsPointDisplacementRenderer has been split into a new pure virtual QgsPointDistanceRenderer base class which handles the detection of clusters and grouping of points. The new cluster renderer reuses this base class to avoid code duplication.

See the crowd funding programme for more details.

image78

This feature was funded by Andreas Neumann, Qtibia Engineering (Tudor Barascu), Karl-Magnus Jönsson, Geonesia (Nicolas Ponzo) & numerous additional anonymous backers whose generous contributions are also highly valued!

This feature was developed by Nyall Dawson

Feature: NEW MAP COLORING ALGORITHMS IN QGIS 3.0

see http://nyalldawson.net/2017/02/new-map-coloring-algorithms-in-qgis-3-0/

image79

This feature was developed by Nyall Dawson

Feature: New "preset" colors color ramp option

Allows use of a color ramp consisting of a list of selected colors. Currently there's no way in QGIS to classify a renderer using some list of colors you've previously selected. So you can modify the colors manually after classifying, but that's a pain if you're regularly using the same color scheme. Basically, it's like the color brewer color ramp options but allowing users to pick their own preset list of colors to use (Because Cynthia Brewer isn't the only cartographic color expert!)

image80

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Allow symbol layers to be temporarily disabled

Adds a new checkbox at the bottom of each symbol layer's properties which allows you to control whether the layer is enabled or not. Disabled layers are not drawn, but are saved and can be enabled at a later stage. This makes it easier to tweak symbol appearance without having to totally delete a symbol layer.

image81

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Easy styling of discrete rasters

In QGIS 3.0, the existing raster Paletted Renderer for rasters was adapted to allow for easy styling of discrete raster layers, such as landcover or boolean rasters. Now, users can select the renamed "Paletted/Unique Values" renderer and click the "Add Unique Values" button to load all unique raster values from the layer. These are automatically assigned a color using the selected color ramp.

The unique value calculation is performed in a background thread to keep the UI responsive for large (or remote) raster layers. Additionally, users can manually add individual new classes as desired, and edit the associated pixel value for any existing class. Deleting multiple classes at once is also supported, as well as changing the color, transparency and labels for multiple classes at once.

Color palettes can be loaded from a text file, with ESRI clr/GDAL/GRASS color table formats supported. Color palettes can be saved to a clr text file for sharing.

image82

This feature was funded by Stéphane Henriod, Satelligence (http://satelligence.com/), Bird's Eye View (https://www.birdseyeviewgis.com/), other anonymous backers

This feature was developed by Nyall Dawson (North Road)

Labelling

Feature: Allow label font size in mm/pixels

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Custom labelling toolbar is now always enabled

Thanks to the awesome auxiliary data storage and the editable joined table, the manual label customization is now always enabled. You do not need anymore to add dedicated fields in your datasource to change labels position, rotation, or any of the possible settings for labels to activate the toolbar. No more copy of readonly datasources and so much faster labeling ! Be warned, labels are only saved along with your project file in a .qgd sqlite database, or inside the .qgz zipped project file if you chose that format. Don't forget to share that .qgd file if you want to share your project file.

And for power users, the old way of having data defined fields in your datasource is still there. Just define them in the layer's properties as before!

image83

This feature was funded by French ministry of Ecology and Sustainable Developpement

This feature was developed by OSLANDIA - Paul Blottiere

Diagrams

Feature: Data definable properties

Add support for more data definable properties to diagrams:

  • Distance
  • Priority
  • ZIndex
  • IsObstacle
  • Show
  • AlwaysShow
  • Diagram Start Angle

This feature was funded by QGIS Grant Program

This feature was developed by Nyall Dawson (North Road)

Rendering

Feature: Live layer support

QGIS 3.0 now supports live layers. These layers get re-rendered automatically at a time interval that you determine, in a clean and flicker free way. Live layers are great for tracking continuously changing data like a fleet of cars, a flock of birds that you have telemetry data for and so on.

image84

This feature was developed by Kartoza & North Road

Feature: Trigger layer refresh or layer actions from PostgreSQL NOTIFY signal

Following the live layer effects, this allows to trigger actions or layer refresh in QGIS only when the database notifies QGIS it should do something. It will require less ressources than refreshing on interval, and you can even code a chat application in QGIS with that :)

See https://vimeo.com/236604742

http://oslandia.com/en/2017/10/07/refresh-your-maps-from-postgresql/

This feature was funded by QGIS.org Grant application

This feature was developed by OSLANDIA - Vincent Mora

Feature: Cache labeling result to avoid unnecessary redraws when refreshing canvas

This change allows the labeling results to be cached to an image following a map render. If the cached label result image can be reused for the next render then it will be, avoiding the need to redraw all layers participating in the labeling problem and resolving the labeling solution. Basically this means that canvas refreshes as a result of changes to any NON-LABELED layer are much faster. (Changing a layer which is part of the labeling solution still requires all labeled layers to be completely redrawn)

This feature was developed by Nyall Dawson (North Road)

Feature: Grid renderer for points displacement

Grid renderer for points displacement

image85

This feature was developed by Muhammad Yarjuna Rohmat (Kartoza)

Digitising

Feature: Range vertex selection in node tool

That feature makes it possible to select a range of vertices from one feature.

It can be activated by pressing Shift+R - afterwards one needs to click start and final point within a feature - this will selected all vertices between the two.

The range selection can be cancelled anytime by right-click or by pressing Esc key.

For closed curves (polygons), it is possible to switch to the "longer" way around the ring by holding Ctrl while clicking the final point.

image86

This feature was funded by French ministry in charge of ecology

This feature was developed by Martin Dobias (Lutra Consulting)

Feature: Add default Z value option

Create Geopackages/Shapefiles: Now with the option to have Z-values

image87

This feature was developed by Alexander Lisovenko / Paul Blottiere

Feature: Move feature now benefits from Advanced Digitizing

Just move a feature using the new "click - click ergonomy" and use the advanced digitizing panel and shortcut to constraint angles, distances, exact XY.

This feature was developed by Denis Rouzaud

Feature: Added functionality to copy/move feature to move feature map tool

This allow to duplicate feature and move them in one move from a selected feature

image88

This feature was developed by Denis Rouzaud

Feature: Tracing with offset

You can now use the trace digitising tool with an offset as shown in the accompanying image.

image89

This feature was funded by d.b.g. Datenbankgesellschaft mbH

This feature was developed by Martin Dobias

Feature: Overhaul of the Vertex tool

The Node tool (now renamed to Vertex tool) has undergone a complete rework to make it more flexible. Some of the more important changes are:

  1. Instead of requiring users to first select a feature and then edit its vertices in the second step, the tool now capable of working with multiple features at the same time. It is therefore easy to select vertices from several features and move or delete them at once. If there is a need to constrain selection of vertices to just specific feature(s), it is possible to select the features with selection tool first - the vertex tool will only work with vertices from selected feature(s) in such cases.
  2. Instead of working just with the currently selected layer, the tool is now able to work with all layers that are in editing mode at the same time. Moving of features that logically belong together but are located in different layers has got much easier. Still, the current layer is respected if there are multiple choices when picking vertices.
  3. Features and their vertices get highlighted as the user moves the mouse pointer over them, giving better visual feedback.
  4. In QGIS 2.x the vertices would be moved by clicking a vertex, dragging it with the left mouse button still pressed and finally dropping them by releasing the mouse button. This behavior has been changed to "click-click" approach where user first clicks a vertex to pick it, then drag it without having any mouse buttons pressed and drop it by clicking again on the final destination. The arguments for this change were the following:
  5. it is easier to precisely place nodes (not having to apply force to the mouse button all the time)
  6. one does not move nodes inadvertently
  7. it is possible to cancel the operation
  8. it allows to pan the map by pressing space bar while the node is being moved

See https://github.com/qgis/QGIS-Enhancement-Proposals/issues/69 for more information.

image90

This feature was funded by QWAT

This feature was developed by Martin Dobias (Lutra Consulting)

Feature: Vertex tool: mid-point markers to add vertices

The improved vertex tool now also displays extra markers on the mid-point of line segments of features. Clicking such marker results in addition of a new vertex. The existing way of adding vertices by double-clicking segments has been kept.

image91

This feature was funded by QWAT

This feature was developed by Martin Dobias (Lutra Consulting)

Feature: Vertex tool: continue line

When editing linestring geometries with the vertex tool, moving the mouse towards the first or the last vertex will display an extra marker just next to the endpoint. Clicking the marker will add a vertex at the end of the geometry.

image92

This feature was funded by QWAT

This feature was developed by Martin Dobias (Lutra Consulting)

Feature: Vertex tool: support for advanced digitizing panel

The advanced digitizing panel now works also with the vertex tool - it is possible to enter coordinates of new or existing vertices in the panel just like in other digitizing map tools.

image93

This feature was funded by QWAT

This feature was developed by Martin Dobias (Lutra Consulting)

Data Management

Feature: Pan to current feature in attribute table

image94

This feature was developed by Marco Hugentobler

Feature: Map of CRS-extent in Project properties

image95

Feature: Auxiliary Storage Support

A new tab is available in vector layer properties to manage auxiliary storage :

A new action Store data in the project is available in the data defined menu providing an easy way to manage auxiliary data for a property :

Auxiliary data is stored in a sqlite database and managed thanks to the OGR data provider (instead of the spatialite provider) to keep as small as possible the database file. This database file (with extension .qgd) is either saved just next to the project file or directly embedded within the new .qgz format.

See the original pull request and this article which explains more

image96

This feature was developed by Paul Blottiere / Oslandia

Feature: Metadata overhaul

The metadata system in QGIS has been overhauled. In QGIS 3.0 we introduce our own internal, formalised metadata schema which is separate from the QGIS project file format. We introduce new API capabilities for reading and writing metadata for layers. We have separated the display of metatadata from the editing and have added a new metadata editing tool. Metadata are currently saved in the project file. It can also be saved as an XML file alongside file based layers or in a local sqlite database for remote layers (e.g. PostGIS).

you can read more about the design considerations adopted in this work by referring to the QGIS Enhancement Proposal (QEP) - QEP-92

Please note this is the first phase in the development of a complete and standards compliant metadata infrastructure for QGIS. We are seeking further funding to implement a more complete implementation for the metadata system - see this document for details of future planned work packages that need funding.

The specification for the QGIS metadata schema is here.

The primary funder for this work was The WorldBank/GFDRR with supporting funding provided by NINA.

image97

This feature was funded by WorldBank/GFDRR

This feature was developed by Kartoza and collaborators

Feature: Unified data source manager dialog

A single unified dialog to handle data source management and layers loading.

image98

This feature was funded by Boundless

This feature was developed by Alessandro Pasotti

Feature: OSM Downloader tool removed

We have removed the OSM downloader tool that was provided in 2.x releases of QGIS. We encourage you to rather use the QuickOSM plugin which has been ported to QGIS 3.0.

Forms and Widgets

Feature: Allow controlling labels for individual edit widgets

In the drag and drop designer, a double click on an item will allow controlling if the label should be shown for each item individually.

This feature was developed by Matthias Kuhn

This feature was developed by Matthias Kuhn

Feature: conditional visibility for tabs and groupboxes

This adds a new configuration option to conditionally show or hide tabs and groupboxes in drag and drop designer forms. Configuration is done via a double click in the designer tree in the fields configuration interface. An expression can be entered to control the visibility. The expression will be re-evaluated everytime values in the form change and the tab or groupbox shown/hidden accordingly.

This feature was developed by Matthias Kuhn

Feature: Smarter default edit widgets with plugins to pick them

Now the widgets can give a score on how well they could handle the type of a field. Leading to better default widgets.

Additionally, plugins can be added to choose a widget type in function of external information. One of them uses a table in PostgreSQL, allowing to specify the widget type and configuration to use for each field.

Automatically pick RelationReference widgets for foreign keys.

This feature was developed by Patrick Valsecchi

Feature: Field constraints can be enforced or not

Non-enforced constraints just show a warning to the user, but do not prevent committing the feature. Enforced constraints block users from committing non compliant features. So we have soft warnings now! Any constraints detected by the provider are always enforced.

image99

This feature was funded by OpenGIS.ch

This feature was developed by Nyall Dawson (North Road)

Feature: Add layer scoped actions

Within the attribute table, there is a new button to trigger actions which are not based on individual features but instead on the whole layer. Normally they will perform actions based on all features or the selection.

This feature was developed by Matthias Kuhn

Feature: Show field values in autocompleter in form filter mode

The autocompleter is nicely updated in the background so that the gui remains nice and responsive, even if there's millions of records in the associated table.

It's now used as a search widget for text fields, so can be seen in the browser window if you set the filter to a text field, or if you launch the form based select/filter by selecting a layer and pressing F3.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Add zoom to features and flash features shortcuts in select by form dialog

Allows very quick navigation and identification of features which match the criteria in the form

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Add between/not between to numerical fields in select by form

image100

This feature was developed by Mathieu Pellerin

Layer Legend

Feature: Hide Deselected Layers action

Allows you to quickly hide all deselected layers. This is very handy when you have a large project and want to quickly hide all except for a couple of layers

image101

This feature was funded by SMEC (Surbana Jurong)

This feature was developed by Nyall Dawson (North Road)

Feature: Change of ergonomy of the visibility of layers inside groups

  • Checking/unchecking a group doesn't change the check state of its children. A node is visible if and only if it is checked and all its parents too.
  • There is no more a semi-checked state for a group
  • Ctrl-clic on a unchecked group will check the group and all its descendants.
  • Clic on a unchecked layer will check the lager and all its parents.
  • Ctrl-clic on a checked group will uncheck the group and all its descendants.
  • Ctrl-clic on a checked layer will uncheck the layer and all its parents.
  • Those actions are available in contextual menu items in the tree view.
  • Invisible layers because they or their parent(s) is unchecked are greyed out.

This feature was developed by Even Rouault

Map Composer

Feature: Control over drawing of composer table grid horizontal & vertical lines

It is now possible to independently control horizontal and vertical line rendering of composer table items. This added flexibility expends the styling possibilities of this item directly within QGIS.

image102

This feature was developed by Mathieu Pellerin

Feature: Drag qpt to QGIS to create new composer from template

This feature was funded by SMEC (Surbana Jurong)

This feature was developed by Nyall Dawson (North Road)

Feature: Allow customization of line spacing for composer legend item labels

This feature was developed by Mathieu Pellerin

Feature: Allow choice of CRS for map items

This allows the CRS for map items to differ from the canvas/project CRS. It also allows different map items to have different CRS, eg an overview map can be set to a different CRS to the main map.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Holding shift while drawing polyline/polygon constrains line angles

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: More data definable controls

Item frame and background colors Data defined svg colors and outline width for composer picture items (Especially useful when the picture is showing a north arrow!) Data defined legend titles and column count Data defined scalebar colors and line width

This feature was funded by QGIS Grant Program

This feature was developed by Nyall Dawson (North Road)

Feature: Map Composer Overhaul

This is a major rework to how compositions are managed in the code of QGIS.

Highlights are:

  • A new QgsLayoutManager class which is used for storage and serializing/deserializing of compositions. A QgsLayoutManager is attached to QgsProject. This allows core code to access the compositions attached to a project. All handling of compositions has been moved from app to core, making it easy for server (and other non-app based projects. QField/roam?) to access project compositions without resorting to fragile xml parsing.
  • Composer windows are created on demand and destroyed on close. This avoids the heavy requirement of creating all composer windows and widgets for every single composer item when loading projects. It was the main reason loading projects with compositions were so slow previously. Now, composer windows are created only when the window is opened and destroyed when the window is closed. Composer item configuration widgets are also only created on demand (when an item is selected) instead of precreating all widgets.
  • A side benefit of destroying composer windows on close is that we now no longer suffer from a Qt bug which blocked use of floating docks in composer windows. Now you can float the item/composition/etc panels! Much nicer for full screen working with compositions on multi-monitor setups.
  • Reworked API for working with composers through iface. Since composer windows don't exist unless they are currently open, all the iface methods for interacting with composers have been redone to make it clear that they only apply to open windows. Additionally, a simple composer interface which provides a stable API for plugins and scripts to work with composer windows has been added. Very basic for now, but in future we can extend with more hooks to allow plugins to interact with composer windows.
  • Lots of code cleanups and removal

More info at https://north-road.com/qgis-layout-and-reporting-engine-campaign/

image103

This feature was funded by The Swiss QGIS User Group and many more!

This feature was developed by Nyall Dawson (North Road)

Analysis Tools

Feature: Raster unique values count for processing

http://imhere-asia.com/blog/post/qgis-raster-layer-unique-values-count

This feature was developed by http://imhere-asia.com/

Processing

Feature: New algorithm for offsetting lines

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New algorithm for single sided buffers

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Add choice of simplification method to simplify

This change allows users to choose which method to use when running the simplify geometries algorithm, with choices of the existing distance based (Douglas Peucker) algorithm, area based (Visvalingam) algorithm and snap-to-grid.

Visvaligam in particular usually results in more cartographically pleasing simplification over the standard distance based methods.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: support for output geometry types in models

Model child algorithm inputs are now filtered to only those which generate applicable geometry types for the input to another child algorithm

This feature was developed by Alexander Bruy

Feature: Angle threshold for smooth algorithm

Add option to QgsGeometry::smooth to not smooth segments shorter than a certain threshold or sharp corners with an angle exceeding a threshold

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Better support for Z/M dimensions and curved geometries

Many more algorithms now respect Z/M values and do not discard this information, and additionally many algorithms now correctly maintain curved geometries without forced segmentization of these geometries.

Feature: Raster analysis algorithms added to Processing

The following algorithms were added to Processing from the Raster Analysis plugin:

  • Aspect
  • Slope
  • Ruggedness
  • Hillshade
  • Relief

Now these algorithms can be used in scripts, models and for batch processing.

image104

This feature was developed by Alexander Bruy

Feature: New algorithm to extract specific nodes

This algorithm allows you to extract specific nodes from geometries. Eg you can extract the first or last node in the geometry.

The algorithm accepts a comma separated list of node indices to extract, eg 0 = first node, 1 = second node, etc. Negative indices can be used to extract nodes from the end of the geometry. Eg -1 = last node, -2 = second last node.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Expose zonal statistics from Zonal statistics plugin in toolbox

This feature was developed by Alexander Bruy

Feature: Add a spatialite execute SQL algorithm

This feature was developed by Mathieu Pellerin

Feature: New algorithm to extend lines

Allows extending linestrings by a set distance at the start and end of the line

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New extract by expression algorithm

Filters an input layer by expression

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Add import into spatialite algorithm

This feature was developed by Mathieu Pellerin

Feature: Interpolation algorithms

Expose IDW and TIN interpolation from Interpolation plugin in toolbox

Interpolation plugin has been removed as a result

This feature was developed by Alexander Bruy

Feature: New algorithm to compute geometry by expression

This algorithm updates existing geometries (or creates new geometries) for input features by use of a QGIS expression. This allows complex geometry modifications which can utilise all the flexibility of the QGIS expression engine to manipulate and create geometries for output features.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Snap geometries to layer algorithm

Port the Geometry Snapper plugin to processing

Snap geometries algorithm allows snapping to other layer types, supports point/line layers

Snap to layer algorithm accepts a mode parameter. With a new option to prefer to snap to closest point on geometry. The old behaviour was to prefer to snap to nodes, even if a node was further from the input geometry than a segment. The new option allows you to snap geometries to the closest point, regardless of whether it's a node or segment.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New input type for expressions

This adds a new input type for expression inputs. Expression inputs can be linked to a parent layer so that the builder shows the correct fields and layer variables.

It's designed to be used when an algorithm specifically requires an expression, eg Select by Expression and Extract by Expression.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: SplitWithLines

Rename algorithm SplitLinesWithLines to SplitWithLines Accept polygon as input, too Use only selected lines to split with (if processing is set to use selection only) Issue log message if trying to split multi geometries Update help

This feature was developed by Bernhard Ströbl

Feature: Pole of inaccessibility algorithm

Implements a processing algorithm to calculate the pole of inaccessibility for a surface, which is the most distant internal point from the boundary of the surface. This function uses the 'polylabel' algorithm (Vladimir Agafonkin, 2016), which is an iterative approach guaranteed to find the true pole of inaccessibility within a specified tolerance. More precise tolerances require more iterations and will take longer to calculate.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Extract by attribute can extract for null/notnull values

Adds support for filtering where an attribute value is null or not null

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Create attribute index algorithm

Allows creation of an index on an attribute in a layer for faster attribute based filtering

Support depends on the underlying data provider for the layer

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New 'drop geometries' algorithm

Simply removes any geometries from an input layer and returns the features with attributes only

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New universal 'basic stats for field' algorithm

Replaces the existing 'Basic Stats for Numeric Fields' and 'Basic Stats for String Fields' algorithms and adds support for date/time/datetime fields.

Having a single unified algorithm allows more flexible models where a field type may not be known in advance.

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Port heatmap plugin to processing algorithm

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: New algorithm to orthagonalize geometries

Adds a new algorithm which tries to make angles in geometries either right angles or straight lines

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Network analysis algorithms

add shortest path and service area algorithms to Processing

also allow calculating shortest path from a point to all points in a layer, or from all points in a layer to an end point. And creating service areas for all points in a layer.

Roadgraph plugin has been removed as a result.

This feature was developed by Alexander Bruy

Feature: Export processing models as PDF/SVG

In addition to exporting processing models as bitmap images, it is now possible to export processing models as resolution-independent PDFs and SVGs. This allows for high-resolution export of models which can be embedded into papers and books being published.

image105

This feature was developed by Mathieu Pellerin

Feature: New algorithm to truncate tables

Irretrievably deletes all features from a table... use with caution!

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Added ‘invalid feature handling’ option

This feature was developed by Victor Olaya

Feature: Algorithm to fix invalid geometries using native makeValid() implementation

This feature was developed by Alexander Bruy

Feature: Add search to Get Scripts and Models dialog

This feature was developed by Alexander Bruy

Feature: Generic centroid algorithm

Reworked centroid algorithm which handles non-polygon layers

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Improved Extract nodes algorithm

Extract nodes algorithm now saves node index, distance along line and angle at node

This feature was funded by Andreas Neumann

This feature was developed by Nyall Dawson (North Road)

Feature: New algorithm for translating (moving) points

Allows geometries to be shifted by a x/y displacement

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Improved processing modeler window

The processing modeler window has received a lot of attention for this release. Improvements include: - zoom controls in the window's toolbar - customization of inputs and algorithms panels' location - panels can now float above the processing window

image106

This feature was developed by Mathieu Pellerin

Feature: New raster unique values report algorithm

A new algorithm was added to processing which returns the count and area of each unique value within a given raster layer.

image107

This feature was developed by Mathieu Pellerin

Feature: Remove TauDEM provider from core Processing

We have removed the TauDEM provider from processing.

image108

Feature: Download a file from Processing

Download a file from Processing. Query a remote API to get a geojson

This feature was developed by Etienne Trimaille

Feature: Optimised points along geometry algorithm

Supports also polygon geometries, handles null geometries, and records the original line angle along with the distance for each point.

image109

This feature was funded by Andreas Neumann

This feature was developed by Nyall Dawson (North Road)

Feature: Sort by expression algorithm

This feature was funded by DFAT/DMI

This feature was developed by Etienne Trimaille (Kartoza)

Application and Project Options

Feature: New zipped project file format .qgz

A long time ago on the developper's mailing list, we discussed of a container storing the xml file and other ressources. This is now possible, though it remains optional. The auxiliary storage feature takes advantage of that by storing the associated .qgd sqlite database. We hope that in next versions land support for embedding other resources like SVG, color ramps, datasources, images, etc...

image110

This feature was funded by French ministry of Ecology and Sustainable Developpement

This feature was developed by OSLANDIA - Paul Blottiere

Feature: Add support for user profiles

All user settings/plugins, etc are now loaded from the app data location for each platform and no longer .qgis3/2. Settings and plugins in each profile are now isolated from each other.

This allows for different runtime setups depending on what the user needs, e.g test, prod, demo, etc

Profile menu allows for switching between profiles or creating new ones.

image111

This feature was developed by Nathan Woodrow

Browser

Feature: Drag'n'drop layers from layer tree view to browser dock

Makes it easy to e.g. store your temporary layers in PostGIS

This feature was developed by Martin Dobias

Feature: Standalone QGIS Browser application removed

We have removed the standalone QGIS Browser application that shipped with QGIS 2.x. This application had poor user uptake and represented a maintenance overhead that we do not wish to continue with in the 3.0 code base.

Data Providers

Feature: New unified 'add layer' dialog

You can now use a single dialog to add a huge variety of data formats to QGIS.

image114

This feature was developed by Alessandro Pasotti

Feature: GeoPackage

  • processing uses pkg by default
  • save as uses pkg by default
  • create new layer uses pkg by default
  • browser drag and drop import layers

This feature was developed by Alessandro Pasotti

Feature: Support all GDAL writable raster formats for 'Save as' dialog on raster layers

This feature was developed by Nyall Dawson

Feature: Support for Z/M geometries in gpkg, spatialite and memory layer provider

Support for Z dimension and M values was added to QGIS' gpkg, spatialite and memory layer provider. the option to add Z and M dimensions has also been added to the "create new layer" dialogs

image115

This feature was funded by QWAT group, http://www.imhere-asia.com/

This feature was developed by Mathieu Pellerin, Alexander Bury, Paul Blottiere

Feature: Unique and not-null constraint handling

Automatic detection of provider-side unique and not-null constraints implemented for postgres, spatialite, ogr provider

Client side unique and not-null constraints can be set within QGIS.

Unique constraints are enforced in attribute form

This feature was funded by OpenGIS.ch

This feature was developed by Nyall Dawson (North Road)

Feature: GeoNode integration

GeoNode is an open source geospatial content management system that makes it easy to publish geospatial data on the web. QGIS 3.0 includes new functionality that will allow you to very easily add a GeoNode instance to the browser tree and add any layers from that site to your project as WMS, WFS or XYZ. There is no need to dig around trying to figure out WMS/WFS end points, QGIS will do everything for you. When using WMS and XYZ Tiled layers, the style of the published GeoNode layer will be used.

If the GeoNode instance uses the QGIS Server backend rather than a GeoServer backed, you can copy and paste styles from the server and apply them to your local layer so that your WFS layer renders exactly as it does on the server (as shown in the animated GIF here).

There are also python bindings so that you can add GeoServer layers to QGIS from your plugins. If you are interested in running your own GeoNode with QGIS Server backend please see this site for details on how you can do that using docker and rancher.

image116

This feature was funded by WorldBank/GFDRR

This feature was developed by Kartoza

Feature: Detect literal default values for spatialite provider

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Create attribute index support for spatialite provider

Allows creation of attribute indexes for spatialite layers

This feature was funded by North Road

This feature was developed by Nyall Dawson (North Road)

Feature: Add support for arrays

Supported by postgres, spatialite

This feature was developed by Patrick Valsecchi

Feature: Support for HStore in PostGIS data provider

Feature: Add auto-discovery of relations for PostgresQL

This feature was developed by Patrick Valsecchi

Feature: Data dependencies between layers

This allows to declare data dependencies between layers. A data dependency occurs when a data modification in a layer, not by direct user manipulation may modify data of other layers. This is the case for instance when geometry of a layer is updated by a database trigger after modification of another layer's geometry.

This feature was developed by Hugo Mercier

Feature: dxf export: support reprojection

This feature was developed by Juergen E. Fischer

Feature: Load/save style in database for GPKG and Spatialite

This feature was developed by Even Rouault

Feature: Improved handling of defaults

Improve handling of defaults (inc provider default clauses, literal defaults, and QGIS expression defaults) and automatically handle unique value constraints on layers

Any fields with unique value constraints will be guaranteed to have a value which is unique to the field.

This also means that after certain editing operations (e.g. copy-paste, split features etc.) attributes will now be set to their default value, if applicable.

This feature was funded by Canton of Zug and the QGEP project

This feature was developed by Nyall Dawson (North Road)

QGIS Server

Feature: QGIS Server overhaul

As you may know, QGIS is jumping to a new major version (yes!). Doing so was made necessary because of the need to switch to python 3, QT5, but also because we needed to break the QGIS API in several places. (http://blog.qgis.org/2016/02/10/qgis-3-0-plans/)

A year ago, a tiny troll from switzerland rang a bell about the strong need for love server code base required. Indeed, the API was locked by some old methods of QGIS server. In short, QGIS server was reparsing the qgs project file in his own way, and created dependencies to part of QGIS we needed to drop.

As outsourcing the server code base was not an option, so we had to refactor it. The involved parties decided to get engaged in a code sprint in the city of Lyon, France dedicated to sharing their vision, planning the work and finally making all the following happen:

Higher level refactoring

All services (WMS GetMap, WFS GetFeature, GetLegendGraphics, WCS, GetPrint etc..) have been rewritten. Some like WMS were entirely rewritten. Kudos to the devs!

New features

  • Multi-thread rendering like in the desktop
  • A new option to trust layer metadata and thus speed up project loading
  • WFS 1.1 support https://github.com/qgis/QGIS/pull/5297
  • Full Python bindings for the server API
  • Server Services as plugins like providers

Deep, complex and unrewarding tasks

  • Remove all singleton calls
  • Cut all the dependencies to the old QGIS project file parser
  • Minimize dependencies to GUI library. Since fonts are necessary to render maps, totally removing them was not feasable.

Infrastructure tasks

  • Build a OGC compliancy platform and integrate it to a continuous integration platform. Conformity reports are now pushed to tests.qgis.org
  • Add unit tests ... and again more unit tests
  • Stress QGIS server against security leaks (SQL injections and other malicious attacks)
  • Start profiling and bench marking performances. This work still need some love - and funding - to be achieved

A presentation was given at FOSS4G-EU in July.

This feature was funded by QGIS.ORG Donors

Feature: Possibility to segmentize feature info geometry in server

Many web clients can't display circular arcs in geometries. To allow such clients to still display a feature's geometry (e.g. for highlighting the feature), a new per project QGIS server option was introduced (Menu "Project" -> "Project Properties" -> "QGIS Server") to segmentize the geometry before sending it to the client in a GetFeatureInfo response.

image117

This feature was funded by Kanton of Zug

This feature was developed by Marco Hugentobler

Plugins

Feature: Remove trusted status from Plugin Manager

https://github.com/qgis/QGIS/pull/5272

Feature: Offline editing: Add flag to only copy selected features

This extends the offline editing possibilities to only work on subset of large layers

This feature was funded by DB Fahrwegdienste GmbH

This feature was developed by Matthias Kuhn

Feature: GDALTools moved to Processing

GDALTools plugin has been removed.

All functions previously available through the GDALTools plugin were moved to the QGIS Processing framework, allowing to use these tools in scripts, models and execute them in batch processes. Additionaly we updated the algorithms with new parameters, introduced in latest GDAL versions and improved overall UI/UX by exposing some advanced parameters like creation options, NODATA value settings etc.

image118

This feature was developed by Alexander Bruy

Feature: allow installing plugins from local ZIP packages

It is now more easy to install plugins manually without having to unzip them in the user profile directory by hand.

image119

This feature was developed by Alexander Bruy

Feature: Plugins can provide a custom help in Expression window

Plugins which are providing expressions can add a custom help made with HTML strings.

image120

This feature was funded by DFAT/DMI

This feature was developed by Etienne Trimaille (Kartoza)

Programmability

Feature: Geometry class updates

There has been a major overhaul of the geometry classes in QGIS. The old classes have been renamed (as per the table below). New geometry classes will properly preserve Z and M attributes if present.

References https://github.com/qgis/qgis3.0\_api/issues/11

This finally brings back a consistent state in naming within the geometry API

Renames

QGIS 2QGIS 3
QgsPolygonQgsPolygonXY
QgsMultiPointQgsMultiPointXY
QgsMultiPolylineQgsMultiPolylineXY
QgsMultiPolygonQgsMultiPolygonXY
QgsPolygonV2QgsPolygon
QgsMultiPointV2QgsMultiPoint
QgsMultiPolylineV2QgsMultiPolyline
QgsMultiPolygonV2QgsMultiPolygon

See also https://github.com/qgis/QGIS/pull/5491

This feature was developed by Matthias, Nyall and others

Feature: Task manager

Introduces a framework for creating background tasks, which are interacted with through a centralised manager

Adds new classes: - QgsTask. An interface for long-running background tasks - QgsTaskManager. Handles groups of tasks - also available as a QgsApplication member for tracking application wide tasks

Add simple python method QgsTask.fromFunction for creation of tasks from a function without having to create a QgsTask subclass

Support for dependent tasks

Cancelling a task on which others depend leads to all these other tasks getting cancelled as well.

Add handling of dependent layers to task manager

If a task has dependent layers which are about to be removed, the task will automatically be cancelled

QgsTasks can have subtasks

Now, a QgsTask can have subtask QgsTasks set by calling QgsTask::addSubTask. Sub tasks can have their own set of dependent tasks.

Subtasks are not visible to users, and users only see the overall progress and status of the parent task.

This allows creation of tasks which are themselves built off many smaller component tasks. The task manager will still handle firing up and scheduling the subtasks, so eg subtasks can run in parallel (if their dependancies allow this).

Subtasks can themselves have subtasks.

This change is designed to allow the processing concept of algorithms and modeller algorithms to be translatable directly to the task manager architecture.

This feature was funded by QGIS Grant Program

This feature was developed by Nyall Dawson (North Road)

Feature: API to allow drag'n'drop of custom browser items

QgsDataItem implementations may provide hasDragEnabled(), mimeUri() and QgsCustomDropHandler implementation to deal with drop of custom items.

This feature was developed by Martin Dobias