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Tag: qgis

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).
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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.
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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.
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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.
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Revue de presse du 9 octobre 2026

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