Wednesday, December 3, 2008
ASTER Level 1 data are archived and can be searched and ordered. Higher level, calibrated and derived products, are created on-demand for each user. Information is provided under "Obtaining Data" to help with the process.
ASTER is a cooperative effort between NASA and Japan's Ministry of Economy Trade and Industry (METI), with the collaboration of scientific and industry organizations in both countries. The ASTER instrument provides the next generation in remote sensing imaging capabilities compared with the older Landsat Thematic Mapper, and Japan's JERS-1 OPS scanner. ASTER captures high spatial resolution data in 14 bands, from the visible to the thermal infrared wavelengths; and provides stereo viewing capability for digital elevation model creation. As the "zoom lens" for Terra, ASTER data are used by other Terra and space-borne instruments for validation and calibration.
Above is an illustration of the Terra spacecraft with the ASTER instrument highlighted. The links to the left under "Mission" will tell you about EOS, science applications, the instrument, and the ASTER airborne simulator.
Thursday, April 10, 2008
|Launch Date||18 December 1999 at Vandenberg Air Force Base, California, USA|
|Equator Crossing||10:30 AM (north to south)|
|Orbit||705 km altitude, sun synchronous|
|Orbit Inclination||98.3 degrees from the equator|
|Orbit Period||98.88 minutes|
|Grounding Track Repeat Cycle||16 days|
|Resolution||15 to 90 meters|
The ASTER instrument consists of three separate instrument subsystems:
VNIR (Visible Near Infrared), a backward looking telescope which is only used to acquire a stereo pair image
SWIR (ShortWave Infrared), a single fixed aspheric refracting telescope
TIR (Thermal Infrared)
ASTER high-resolution sensor is capable of producing stereoscopic (three-dimensional) images and detailed terrain height models. Other key features of ASTER are:
- Multispectral thermal infrared data of high spatial resolution
- Highest spatial resolution surface spectral reflectance, temperature, and emissivity data within the Terra instrument suite
- Capability to schedule on-demand data acquisition requests
ASTER has 14 bands of information. For more information, please see the following table:
|Cross Track Pointing||± 318km (± 24 deg)||± 116km (± 8.55 deg)||± 116km (± 8.55 deg)|
ASTER is the only high spatial resolution instrument on Terra that is important for change detection, calibration and/or validation, and land surface studies. ASTER data is expected to contribute to a wide array of global change-related application areas, including vegetation and ecosystem dynamics, hazard monitoring, geology and soils, land surface climatology, hydrology, land cover change, and the generation of digital elevation models (DEMs). Satellite Imaging Corporation (SIC) is an official distributor for ASTER Imagery through USGS.