There are three known discrepancies with ASTER Level-1 data that were recently identified: 1) Earth rotation angle error, 2) Earth nutation-related longitudinal error, and 3) Earth ellipsoid-related terrain error. The first two affect certain time frames while the third is universal. The ASTER Science Team has implemented a web-based correction tool that performs all three corrections to a user-supplied ASTER data set. Users physically provide their ASTER Level-1A or -1B data sets by uploading them to an FTP server. The requisite corrections are applied to make the necessary coordinate adjustments to the provided data sets. The corrected data sets are then staged for the user to download them from the same FTP server.

•   Detailed description of corrections
• Web-based correction tool