Tag: qgis

Thoughts and Discussions on the Development of QGIS Plugins

A few weeks ago, Oslandia organized a webinar/roundtable discussion titled “Creating QGIS Plugins in 2026: Challenges, Expectations, and Concerns!” open to the international developer community.

The goal was to share our experiences as QGIS plugin developers—including our objectives, habits, and challenges—as well as to discuss the available tools.

This discussion was also a great opportunity to share our feedback as developers, identify needs related to QGIS plugin development, and explore ways to make the most of our development work.

If you missed the session, you can find the recording here: https://s.zoom.us/m/bPlTUNXA2

Julien Moura’s introductory presentation is also available!

As a key contributor to the open-source QGIS solution, Oslandia has been actively contributing to its development for over 15 years—from the QGIS core to the development of plugins such as CityForge and, more recently, QSunPotential.

If you’d like to discuss your challenges, difficulties, or ideas, feel free to contact us at: infos+qgis@oslandia.com

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Embed Interactive Maps on Websites with Kumoy - QGIS LAB by MIERUNE

Introduction When you show a QGIS map on a web page as an image, viewers cannot pan to the place they care about or zoom in for detail. Building a web map from scratch is another option, but it requir...
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ChatGPT for QGIS: What It Can and Can't Do, Tested

Can ChatGPT automate QGIS? I asked it for PyQGIS code on three real tasks and ran every script in QGIS. What worked, what failed without an error, and why.
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What Is a CRS in GIS? EPSG Codes and Fixing Wrong Layers

A CRS tells software where coordinates sit on Earth. Datums, EPSG codes, 4326 vs 3857, and a step-by-step fix for a layer that lands in the wrong place.
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What Is NDVI? Formula, Value Chart and the Sentinel-2 Trap

NDVI = (NIR - Red) / (NIR + Red), from -1 to 1. What each value range means, a season measured field by field, and the offset that turns 0.82 into 0.56.
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What Is PyQGIS? A First Script and a Chatbot Code Test

Where to run PyQGIS, a first script, and a test on six tasks: chatbot code always ran, but one result was silently wrong when given only layer names.
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What Is QGIS? Free GIS Software, QGIS 4, and the 10 Top Plugins

QGIS is free, open-source GIS for Windows, macOS and Linux. What people use it for, what QGIS 4 changed in 2026, and the 10 most downloaded of 3,600 plugins.
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Download Sentinel-2 Images in QGIS: 4 Free Methods

Stream Sentinel-2 over STAC with no account, or get the L2A product from Copernicus Browser. Four methods tested on farms in Brazil, with timings.
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How to Download OSM Data in QGIS: 4 Methods, Timed

QuickOSM fetched 4,560 buildings in 5 seconds; a whole country timed out. When to use QuickOSM, a Geofabrik .pbf (Kenya in 57 s), Overpass Turbo or an AI agent.
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How to Georeference an Image in QGIS: 3 Ways, on a 1947 Map

Layer > Georeferencer, 8 points, Polynomial 1 and a 34 s warp on a 1947 scan. Which transformation to pick, and why an RMSE of zero hid a map 594 m off.
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