This image, acquired by NASA's Terra spacecraft on May 1, 2011, shows more than 314,000 acres burned in west Texas. The 2011 fire season in Texas is of historic proportions.

The 2011 fire season in Texas is of historic proportions. The Rock House fire was the largest grass fire in Texas history, and burned more than 314,000 acres in west Texas. More than 400 fire personnel spent 25 days to contain the blaze, which charred one-fourth of Jeff Davis County. The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on NASA's Terra spacecraft acquired this image of the wildfire on May 1, 2011. The image covers an area of 45 by 68 kilometers (28 by 42 miles), and is located near 30.7 degrees north latitude, 103.9 degrees west longitude.

With its 14 spectral bands from the visible to the thermal infrared wavelength region and its high spatial resolution of 15 to 90 meters (about 50 to 300 feet), ASTER images Earth to map and monitor the changing surface of our planet. ASTER is one of five Earth-observing instruments launched Dec. 18, 1999, on Terra. The instrument was built by Japan's Ministry of Economy, Trade and Industry. A joint U.S./Japan science team is responsible for validation and calibration of the instrument and data products.

The broad spectral coverage and high spectral resolution of ASTER provides scientists in numerous disciplines with critical information for surface mapping and monitoring of dynamic conditions and temporal change. Example applications are: monitoring glacial advances and retreats; monitoring potentially active volcanoes; identifying crop stress; determining cloud morphology and physical properties; wetlands evaluation; thermal pollution monitoring; coral reef degradation; surface temperature mapping of soils and geology; and measuring surface heat balance.

The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate, Washington, D.C.

More information about ASTER is available at

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