QGIS Open Day: Friday from 10 UTC

Tag: qgis

Free DEM Download: SRTM, Copernicus and LiDAR in QGIS

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.
Learn More

How Tall Is a Story? 10 Feet, Measured on 307,225 Buildings

One story is 3.07 m (10.1 ft) floor to floor at the median. Heights for 1 to 12 stories: a 5-story building stands 16.2 m (53 ft), a 10-story one 27 m (89 ft).
Learn More

How to Make a Heat Map in QGIS (and With One Prompt)

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.
Learn More

Microsoft Building Footprints vs Google vs Overture, Tested

Microsoft matched 25% of a French town's cadastre buildings, OpenStreetMap 83%. Then Nairobi: five free sources, timed downloads, checked on drone imagery.
Learn More

What Is a KML File? How to Open, Edit and Convert It Free

KML is map data written as XML; a KMZ is the zipped form. Open it in Google Earth or QGIS, find attributes hidden in HTML, convert to Shapefile, CSV or GeoJSON.
Learn More

Revue de presse du 9 octobre 2026

Une GeoRDP d'automne, avec des géotrucs parfois concrets et à picorer, façons géotapas divers et variés.
Learn More

From CAD to GIS: When you need to make the transition

Discover why and how to transition your engineering drawings from CAD to GIS for improved asset management, spatial querying, and real-world accuracy.
Learn More

NDVI vs EVI, SAVI, NDRE and NDWI: Formulas for QGIS

NDVI flattens out over dense canopy. EVI, SAVI, NDRE, NDWI and NDMI each fix a blind spot. Raster Calculator formulas and a measured test in Brazil.
Learn More

Satellite Image Resolution Compared: 30 m to 30 cm, Free vs Paid

8 sources from Landsat to Pléiades Neo, with price and revisit. On one suburb, 0.2% of buildings cover 16 pixels at 10 m and 96% at 50 cm, of 20,911 counted.
Learn More

Sentinel-2 vs Landsat 8 and 9: Bands, Resolution, Clear Days

10 m vs 30 m, 5-day vs 8-day revisit, 13 vs 11 bands. Over one year near Rennes, Sentinel-2 gave 53 clear days and Landsat 30, with waits up to 33 vs 79 days.
Learn More