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Posts by TerraLab

Photogrammetry vs LiDAR: Which One for Which Job

Photogrammetry rebuilds a surface from overlapping photographs. LiDAR measures it with a laser. One gives you colour and a cheap flight, the other gives you the ground under the trees.
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Multispectral vs Hyperspectral Imagery, Explained

Multispectral imagery records a few wide bands of light. Hyperspectral records hundreds of narrow ones. What each can tell you about a field, a roof or a mine, and what it costs.
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Site Plan vs Plot Plan: What Each One Shows

A plot plan draws one lot: its lines, its building, its setbacks. A site plan draws the whole project. Which one a permit asks for, and who draws it.
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Orthomosaic vs Orthophoto: What Each Word Means

An orthophoto is one aerial photograph corrected to a map. An orthomosaic is many of them stitched into one image. Which one you have, and where the seams are.
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Semantic vs Instance Segmentation on Aerial Imagery

Semantic segmentation labels every pixel with a class: building or not. Instance segmentation draws every building as its own object.
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AI Agent for QGIS: The Complete Guide

Step-by-step guide to AI Agent for QGIS: install it, send your first message, then follow eight real tutorials, from flood maps to NDVI and web search.
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Greenfield vs Brownfield: The Difference, on a Map

A greenfield site has never been built on. A brownfield site has, and may still carry what the last use left behind. How to tell them apart in QGIS.
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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: The Difference, and How to Tell

A DSM is the height of the top of everything: roofs, treetops, bare ground. A DTM is bare ground alone. DEM is the generic word, and usually means bare ground.
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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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