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Posts by TerraLab

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, threshold the blue, run a water index, or use a segmentation model. 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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Turn a Satellite Image into a Site Plan in QGIS

Load imagery in QGIS, draw a zone, and get a georeferenced four-class site plan back in under a minute. The manual route, the AI route, and where each breaks.
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How to Redesign a Street in QGIS: 5 Methods

Five ways to show a street rebuilt, from hand-drawn vector layers to a generated aerial view. Only one gives back a picture that stays on the map.
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How to Simulate a Flood in QGIS: 5 Methods

From the official hazard map to a generated aerial view of the water. Which method gives a number, which gives a picture, why an elevation model changes both.
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Convert Raster to Vector in QGIS: 5 Methods

For a classified raster, use Raster > Conversion > Polygonize. Here are the five methods, the fix for staircase edges, and what to do with a photograph.
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What Is a Building Footprint? Definition and Area

A building footprint is the ground area a building covers, measured at its outer walls. What counts, how to calculate it, how it differs from floor area.
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What Is GeoAI? Definition, Examples, Uses in QGIS

GeoAI is machine learning run on geographic data. The five things it extracts today, what it costs in hardware and time, and how to run it in QGIS.
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