Tag: tutorial

Build a tree inventory in QGIS: one point per tree from aerial imagery or LiDAR, with ID, crown size and height, then species and condition from the field.

A figure ground map shows buildings in black and the rest in white. How to make one in QGIS from open footprints, or from an aerial image without them.

The IGN Geoplateforme URLs that answer on 19 October 2026, the exact layer names, WMS vs WMTS measured in QGIS, and why a French layer stays blank.

How to geocode addresses in QGIS for free with Nominatim, MMQGIS, the US Census and the French BAN, with match rates and errors measured on 200 real schools.

Make a map in QGIS 3.44 from open data: style it, label it, build a print layout with legend, scale bar and north arrow, export it. Then the same map by AI.

How to digitize a map in QGIS: draw polygons by hand with snapping and tracing, trace a scanned map, convert a raster, or let AI outline every object at once.

How to do a spatial join in QGIS: join attributes by location or by nearest, count points in polygons, pick the right predicate, and avoid the CRS traps.

Over one Pyrenean valley, four free 30 m DEMs sat 12 to 18 m above the LiDAR ground under forest. Where to get each DEM free, and how to load it in QGIS.

6,041 bike crashes in Paris mapped three ways in QGIS: Heatmap renderer, kernel density raster and hexagons, then one sentence to an AI agent: 2 min 34 s.

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.