About four months later, all Landsat data was made available at no cost. In October 2008, USGS made all Landsat 7 data free to the global public data downloads increased sixty-fold. Since June 2003, the sensor has acquired and delivered data with data gaps caused by the Scan Line Corrector (SLC) failure. 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). This instrument was improved from previous instrumentation designs. The satellite carries the Enhanced Thematic Mapper Plus (ETM+) sensor. Landsat 7 was launched from Vandenberg Air Force Base in California on Apon a Delta II rocket.
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