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LP DAAC Offers New ASTER Level-1B On-Demand Data Sets

On May 24, 2006, the LP DAAC started offering ASTER Level-1 data sets as on-demand products. Two reasons are responsible for this change:

• This action allows the LP DAAC to offer the entire ASTER Level-1A archive for Level-1B processing. Previously, we were constrained by which Level-1A data sets were available as Level-1B data sets. This provides users the opportunity to request a Level-1B from any existing Level-1A data set.
• This action further enables the LP DAAC to produce an updated ASTER Level-1 data set incorporating certain corrections and algorithm changes to ASTER's geometry and radiometry implemented by the Ground Data System (GDS) in Tokyo, Japan.

The corrected and updated ASTER Level-1A data are used to generate the Level-1B data set, which in turn are used as the input for generating all the higher-level products except the ASTER DEM, which uses an ASTER Level-1A data set. Users may choose to order the new Level-1A, Level-1B, or any of the higher-level products (subject to the appropriate band availability). All the Level-1 data sets and higher-level products are disseminated via the FTP-Pull process only. The Level-1B data sets are offered with standard projection and resampling options.

For more information, click here: http://lpdaac.usgs.gov/aster/aster-l1b_od_processing.asp

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