Landsat-7 ETM+ Satellite Imagery, 2011

The Landsat Series is a joint USGS and NASA-led enterprise for Earth observation that represents the world's longest running system of satellites for moderate-resolution optical remote sensing for land, coastal areas, and shallow waters. Landsat 7 was launched from Vandenberg Air Force Base in California on April 15, 1999, on a Delta II rocket. The satellite carries the Enhanced Thematic Mapper Plus (ETM+) sensor. This instrument was improved from previous instrumentation designs. The primary features on Landsat 7 include a panchromatic band with 15 meter spatial resolution, an onboard full aperture solar calibrator, five percent absolute radiometric calibration, and a thermal infrared channel with a four-fold improvement in spatial resolution over Thematic Mapper (TM).

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