offer data at fine resolutions in digital format to produce maps in much simpler, cost effective and efficient manner in terms of mathematical modeling. The launch of SPOT, IKONOS, QuickBird, OrbView, GeoEye, WorldView, KOMPSAT etc. In the current era, most high resolution satellite images are commercially available, and are being used as a substitute to aerial photographs. Image credits: EarthExplorer (Corona) and Google Earth (GeoEye-1).
A comparison of declassified Corona (1974) vs.
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