The 'satellite imagery' with highest spatial resolution for urban mapping is currently:
Choose the correct answer
MODIS satellite at 1 km resolution
Submetric satellites (< 1 m like WorldView-3 at 0.31 m or Cartosat-3 at 0.25 m) for urban-scale mapping
Landsat at 30 m resolution
Weather satellites at 1–5 km
Correct Answer
B. Submetric satellites (< 1 m like WorldView-3 at 0.31 m or Cartosat-3 at 0.25 m) for urban-scale mapping
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Commercial satellites: WorldView-3 = 0.31 m pan, 1.24 m multispectral (highest commercial). WorldView-2 = 0.46 m. Pléiades = 0.5 m. Cartosat-3 (India, ISRO) = 0.25 m pan (submetric). RESOURCESAT/Sentinel: 10–30 m. IKONOS/QuickBird: 0.6–0.61 m (older). For urban cadastral/building mapping: submetric (< 1 m) resolution needed. LiDAR still provides better accuracy for 3D.
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