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Tag: tutorial

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 the two places 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, 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

From a Google Satellite view of Letchworth Garden City to a four-class site plan in under a minute. The manual route, the AI route, and where each one breaks.
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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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Detect Building Footprints in QGIS: 3 Methods

Draw a zone, name the object, run it: you get a polygon layer in minutes. Open data, hand-digitizing and AI detection compared, with the filtering step.
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Segment Anything (SAM) in QGIS: 7 Plugins Compared

SAM outlines an object from a click or a word. Seven QGIS plugins run it: what each costs, which needs an NVIDIA card, and how to install one.
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AI Segmentation for QGIS: The Complete Guide

Draw a zone, name the object, get every polygon as a clean vector layer. The full run in QGIS, the three-step review in any order, and Semi-Auto mode.
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