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Tag: qgis

Greenfield vs Brownfield Sites: Meaning and Differences

A greenfield site has never been built on. A brownfield site has, and may still hold slabs, sheds or contamination. What each costs and how to tell them apart.
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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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DSM vs DTM vs DEM: What's the Difference and Which to Use

A DSM is the top of everything: roofs, treetops, ground. A DTM is bare ground alone, and DEM usually means the same. Which one to use for flood, slope or 3D.
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Revue de presse du 4 septembre 2026

La GeoRDP de rentrée, avec des exercices de maths et de SVT pour affûter votre géo-logique !
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[Blog] A new direct way to connect Trimble receivers

Connect Trimble receivers directly to Mergin Maps with our new integration. Enjoy a seamless, single-tap setup and full access to high-accuracy GPS data.
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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, use a segmentation model, threshold the blue, or run a water index. 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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