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Aster 20th Anniversary: Achievements and Geologic Contributions to Mineral and Lithologic Mapping

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is a 15-channel imaging instrument operating since1999 on NASA’s Earth Observing morning orbital platform Terra ( Yamaguchi et al., 1998 ). The ASTER instrument was built and provided by Japan’s Ministry of Economy, Trade, and Industry (METI). U.S. National Aeronautics and Space Administration (NASA) provided the platform and launch vehicle. ASTER is jointly scheduled and operated by NASA and METI. ASTER has three separate optical subsystems: the visible and near-infrared (VNIR) radiometer, acquiring images in 3 bands with a 15 m instantaneous field of view (IFOV), and an additional backward-looking band for stereo; the shortwave infrared (SWIR) radiometer, acquiring images in 6 bands with a 30 m IFOV; and the thermal infrared (TIR) radiometer, acquiring images in 5 bands with a 90 m IFOV. ASTER acquires images in all bands with a swath width of 60 km. It orbits the earth in a sun-synchronous near-polar orbit with an equator crossing time of 10:30 am, and the daytime repeat visit interval is 16 days at the equator. On average, 550 scenes are acquired every day; over 3.5 million scenes are currently in the archive.