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NDVI vs EVI, SAVI, NDRE and NDWI: Which Index When

NDVI flattens out over dense canopy. EVI, SAVI, NDRE, NDWI and NDMI each fix one of its blind spots. Formulas, Sentinel-2 bands and a measured test in Brazil.
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Satellite Imagery Resolution Compared: What You See at 30 m, 10 m, 3 m and 30 cm

Pixel sizes from Landsat to drones, one French suburb shown at each, and a count of how many of its 20,911 buildings and 2,966 pools each resolution can see.
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Sentinel-2 vs Landsat 8 and 9: Bands, Resolution, Revisit

Sentinel-2 sees 10 m pixels every few days, Landsat 8 and 9 see 30 m with a thermal band and an archive back to 1972. Bands side by side, and a year of clear views counted at three farms.
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ChatGPT for QGIS: What It Can and Can't Do, Tested

Can ChatGPT automate QGIS? I asked it for PyQGIS code on three real tasks and ran every script in QGIS. What worked, what failed without an error, and why.
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What Is a CRS (Coordinate Reference System)?

A CRS tells software where coordinates sit on Earth. Datums, projections, EPSG codes, 4326 vs 3857, and how to fix a layer that lands in the wrong place.
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What Is NDVI? Meaning, Values and Formula

NDVI measures how green and dense vegetation is, from red and near-infrared light. What the values mean, a season measured field by field, and QGIS steps.
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What Is QGIS? The Free GIS, Explained for 2026

QGIS is free, open-source software for making maps and working with geographic data. What it does, what QGIS 4 changed, and 3,600 plugins counted.
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Photogrammetry vs LiDAR: Which One for Which Job

Photogrammetry rebuilds a surface from overlapping photos. LiDAR measures it with a laser. One gives colour and a cheap flight, the other sees 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.
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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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