1. SPOT Web Page. [Online] [http://www.spotimage.fr]
2. Landsat 7 Web Page. [Online] [http://geo.arc.nasa.gov/sge/landsat/]
3. IKONOS Web Page. [Online] [http://www.geoeye.com/CorpSite/products-and-services/imagery-sources/]
4. QuickBird Web Page. [Online] [http://www.digitalglobe.com]
5. OrbView Web Page. [Online] [http://www.orbital.com/SatellitesSpace/ImagingDefense/]