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Tag: tutorial

How to Add a Basemap in QGIS: XYZ, WMS and Plugins

Browser panel, XYZ Tiles, double-click OpenStreetMap. Then Google, Esri and Bing by URL, national imagery by WMS, and which basemap a detection model can read.
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Colored site plan: the same block four ways

Flat, watercolor, pencil and glossy, all rendered from one aerial image of Letchworth Garden City. Every prompt in full, and where the model invented water.
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Detect Solar Panels in QGIS: 5 Methods

Check OpenStreetMap first. Then four ways to map rooftop PV from aerial imagery in QGIS, with the menu paths and where each one fails.
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Detect Swimming Pools in QGIS: 5 Methods

Start with QuickOSM on leisure=swimming_pool. Where the map is thin, threshold the blue, run a water index, or use a segmentation model. Five methods compared.
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Extract Roads in QGIS: 6 Methods and One Trap

Start with QuickOSM. Where OSM is thin, five more ways to get roads out of imagery, and the line-or-surface choice that decides all of them.
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Map Tree Canopy in QGIS: 6 Methods, Free and Paid

For multispectral imagery, threshold NDVI in the raster calculator, then polygonize. Six methods, what each one needs, and what a canopy layer costs.
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Turn a Satellite Image into a Site Plan in QGIS

From a Google Satellite view of Letchworth Garden City to a four-class site plan in under a minute. The manual route, the AI route, and where each one breaks.
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Convert Raster to Vector in QGIS: 5 Methods

For a classified raster, use Raster > Conversion > Polygonize. Here are the five methods, the fix for staircase edges, and what to do with a photograph.
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Detect Building Footprints in QGIS: 3 Methods

Draw a zone, name the object, run it: you get a polygon layer in minutes. Open data, hand-digitizing and AI detection compared, with the filtering step.
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Segment Anything (SAM) in QGIS: 7 Plugins Compared

SAM outlines an object from a click or a word. Seven QGIS plugins run it: what each costs, which needs an NVIDIA card, and how to install one.
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