ASTER User Handbook

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ASTER Users Handbook Parameter Version 2.1 Geometric Db Intra-Telescope Registration VNIR < 0.1 pixel SWIR < 0.1 pixel TIR < 0.1 pixel Inter-Telescope Registration SWIR/VNIR < 0.2 pixel TIR/VNIR < 0.2 pixel Stereo Pair System Error Band 3B/3N < 10 m Pixel Geolocation Knowledge* Relative < 15 m Absolute < 50 m * Not Terrain-Corrected Table 6: Geometric Performance of ASTER Level-1 Data (Based on V2.1 of the Geometric Correction Database). Geometric System Correction Database There is an evolving geometric system correction database that is maintained at GDS. This database provides the geometric correction coefficients that are applied to produce the Level-1B data. The geometric correction reference in an ASTER Level-1 data set is provided in both the HDF and ECS metadata. In the HDF file, this is present as the GeometricDBVersion value in the ProductMetadata.0 block. In the ECS .met file, the same attribute name and value are present as part of the granule-level metadata. The evolving versions of the GeometricDBVersions till date have been 01.00, 01.01, 01.02, 02.00 and 02.05. 26
ASTER Users Handbook 7.0 Data Acquisition Strategy ASTER was not designed to continuously acquire data, and hence each day’s data acquisitions must be scheduled and prioritized. The ASTER Science Team has developed a data acquisition strategy to make use of the available resources. Acquisition requests are divided into three categories: local observations, regional monitoring, and global map. Local Observations Local Observations are made in response to data acquisition requests from authorized ASTER Users. Local Observations might include, for example, scenes for analyzing land use, surface energy balance, or local geologic features. One subset of Local Observations consists of images of such ephemeral events as volcanoes, floods, or fires. Requests for "urgent observations" of such phenomena must be fulfilled in short time periods (of a few days). These requests receive special handling. Regional Monitoring Data Regional data sets contain the data necessary for analysis of a large region (often many regions scattered around the Earth) or a region requiring multi-temporal analysis. A "Local Observation" data set and a "Regional Monitoring" data set are distinguished by the amount of viewing resources required to satisfy the request, where smaller requirements are defined as Local Observations and larger requirements are defined as Regional Monitoring. The ASTER Science Team has already selected a number of Regional Monitoring tasks. Among the most significant are three that involve repetitive imaging of a class of surface targets: 1. The world's mountain glaciers, 2. The world's active and dormant volcanoes, and 3. The Long-Term Ecological Research (LTER) field sites. Global Map The Global data set will be used by investigators of every discipline to support their research. The high spatial resolution of the ASTER Global Map will complement lower resolution data acquired more frequently by other EOS instruments. This data set will include images of the entire Earth’s land surface, in all ASTER spectral bands and stereo. Each region of the Earth has been prioritized by the ASTER Science Team for observation as part of the Global Map. Currently the following characteristics have been identified for images in the Global Map data set: 27
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