April 9, 1984
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Frisco, Texas is a city in the Dallas-Fort Worth metroplex, located about 40 km (24.9 mi) northeast of the Dallas/Fort Worth International Airport. Founded in 1860 along the Shawnee Trail, the town has become a bedroom community for workers in Dallas-Fort Worth. The city saw explosive growth between April 9, 1984 when the Landsat TM image was acquired, and April 15, 2018 when the ASTER image was acquired. Population grew from 4,500 to 174,000. The images cover an area of 27 by 34.5 km (16.7 by 21.4 mi), and are located at 33.1 degrees north, 96.8 degrees west.

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 http://asterweb.jpl.nasa.gov/.