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This Landsat image shows Lake Superior and the Apostle Islands off the tip of the Bayfield Peninsula in Wisconsin.

Landsat false color images reveal various types of land cover. Each pixel in a full-scale Landsat image represents about 30 meters. The images are generated by computers based on reflected and emitted electro-magnetic energy detected by sensors in the Landsat satellite. While traditional optical imagery utilizes three bands of energy (red, green and blue light), Landsat and other hyperspectral sensing measures energy in six or more bands. As a result, Landsat images can detect and distinguish features not apparent in conventional photography. Coverage for most of Earth is available in MrSID compression format from NASA and other sources (see Links).


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