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Tag: tutorial

How to Download OpenStreetMap Data into QGIS

QuickOSM for a town, a Geofabrik .pbf for a country, Overpass Turbo for custom queries. Tested on Kisumu, with the timeouts and the ODbL credit.
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How to Download Sentinel-2 Images in QGIS

Stream Sentinel-2 into QGIS over STAC with no account, or download the L2A product from Copernicus Browser. Bands, clouds and NDVI, tested in Brazil.
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How to Georeference a Map or Image in QGIS

Open Layer > Georeferencer, place control points, pick Polynomial 1 and a projected CRS. Then read the RMSE in metres: tested on a 1947 USGS map.
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AI Agent for QGIS: The Complete Guide

How to use AI Agent in QGIS: install it, write your first request, stay in control, then 10 real runs, from georeferencing an old map to an HTML report.
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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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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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