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Tag: guide

AI GIS: What It Does Today and Which Tool to Use

AI GIS is software that does GIS work from imagery or a plain request. The five jobs it handles in 2026, the tools for each, and where it still fails.
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What Is Remote Sensing? Sensors, Free Data, QGIS

Remote sensing is measuring the ground from satellites, planes and drones. The sensors, the free data, and a Sentinel-2 workflow in QGIS, step by step.
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Urban Infill: What It Is, and Three Scenarios on One Lot

Urban infill means building on vacant or underused land inside a city. The five kinds of lot, how to find them in QGIS, and one lot rendered three ways.
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Will AI Replace GIS Jobs? What It Automates Today

AI now digitizes, scripts and runs whole QGIS tasks. US mapping jobs are still projected to grow to 2035. Here is what changes, task by task, and what to learn.
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How Tall Is a Story? 10 Feet, Measured on 307,225 Buildings

One story is 3.07 m (10.1 ft) floor to floor at the median. Heights for 1 to 12 stories: a 5-story building stands 16.2 m (53 ft), a 10-story one 27 m (89 ft).
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Microsoft Building Footprints vs Google vs Overture, Tested

Microsoft matched 25% of a French town's cadastre buildings, OpenStreetMap 83%. Then Nairobi: five free sources, timed downloads, checked on drone imagery.
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What Is a KML File? How to Open, Edit and Convert It Free

KML is map data written as XML; a KMZ is the zipped form. Open it in Google Earth or QGIS, find attributes hidden in HTML, convert to Shapefile, CSV or GeoJSON.
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NDVI vs EVI, SAVI, NDRE and NDWI: Formulas for QGIS

NDVI flattens out over dense canopy. EVI, SAVI, NDRE, NDWI and NDMI each fix a blind spot. Raster Calculator formulas and a measured test in Brazil.
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Satellite Image Resolution Compared: 30 m to 30 cm, Free vs Paid

8 sources from Landsat to Pléiades Neo, with price and revisit. On one suburb, 0.2% of buildings cover 16 pixels at 10 m and 96% at 50 cm, of 20,911 counted.
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Sentinel-2 vs Landsat 8 and 9: Bands, Resolution, Clear Days

10 m vs 30 m, 5-day vs 8-day revisit, 13 vs 11 bands. Over one year near Rennes, Sentinel-2 gave 53 clear days and Landsat 30, with waits up to 33 vs 79 days.
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