ASTER User's Guide - NASA

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ASTER Level-1A Users Handbook Data GranuleData DirectoryGeneric HeaderCloud Coverage TableAncillary DataVNIR DataVNIR-Specific HeaderVNIR Band 1VNIR Band 2VNIR Band 3NVNIR Band 3BVNIR Supplementary DataVNIR Image DataRadiometric Correction TableGeometric Correction TableSWIR DataVNIR-Specific HeaderSWIR Band 4SWIR Band 5SWIR Band 6SWIR Band 7SWIR Band 8SWIR Band 9SWIR Image DataRadiometric Correction TableGeometric Correction TableSWIR Supplementary DataTIR DataTIR-Specific HeaderTIR Band 10TIR Band 11TIR Band 12TIR Band 13TIR Band 14TIR Image DataRadiometric Correction TableGeometric Correction TableTIR Supplementary DataFigure 7: Data Structure of an ASTER Level-1A Data Granule.20
ASTER Users Handbook3.2 ASTER Level-1B DataThe ASTER Level-1B data are L1A data with the radiometric and geometric coefficientsapplied. All of these data are stored together with metadata in one HDF file. The L1B image isprojected onto a rotated map (rotated to “path oriented” coordinate) at full instrumentresolutions. The Level-1B data generation also includes registration of the SWIR and TIR data tothe VNIR data. And in addition, for SWIR in particular, the parallax errors due to the spatiallocations of all of its bands are corrected. Level-1B data define a scene center as the geodeticcenter of the scene obtained from the L1A attribute named “SceneCenter” in the HDF-EOSattribute “productmetadata.0”. The definition of scene center in L1B is the actual center on therotated coordinates (L1B coordinates) not the same as in L1A.The structure of the L1B data file is shown schematically in Figure 8. This illustration is for theproduct generated when the instrument is operated in full mode (all systems are on and acquiringdata). In other restricted modes, e.g. just SWIR and TIR, not all the items listed in Figure 8 areincluded in the product.3.2.1 ASTER Level-1B BrowseThe ASTER Level-1B data sets do not have dedicated browse images of their own. Theirbrowse link maps back to their ASTER Level-1A parent’s browse images. Occasionally, thereare instances when an L1B browse link is grayed out or inactive. This happens under twocircumstances: one, the L1B data set was sent from GDS to LP-DAAC ahead of the L1A parent,or two, the LP-DAAC archive has not yet received the corresponding L1A parents.21
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