ASTER User's Guide - NASA

ASTER Users Handbookoriented image to north-up. If you are using an ASTER Level-1B processed prior to May2001, using an algorithm version that is less than 4.0 (referred to as PGEVERSION in thehdf metadata), it is important to bear in mind that the SceneOrientationAngle values havereverse signs.13.6 ASTER Higher-Level ProductsWhat higher-level products are produced from an ASTER L1A data set, and where can Ilearn more about them?Presently, the only higher-level products produced from an ASTER L1A data set are• an absolute Digital Elevation Model (DEM). This product requires a requestor to submitGround Control Points (GCPs) for their area of interest• A relative DEM. This does not require a requestor to provide GCPs.For more general information on the ASTER DEM product, check the product’s one-pager at:http://edcdaac.usgs.gov/aster/ast14dem.htmlFor more technical details on the ASTER DEM, check its Algorithm Theoretical BasisDocument (ATBD) at:http://eospso.gsfc.nasa.gov/ftp_ATBD/REVIEW/ASTER/ATBD-AST-08/atbd-ast-08.pdfWhat higher-level products are produced from an ASTER L1B data set, and where can Ilearn more about them?All the higher-level ASTER geophysical products (except an absolute DEM) are produced usinga L1B as its input. These products including their Long and Short names are listed below:[There are 2 sources of information on each of these products that you would find useful:• one, an ASTER Data Products Specification document that provides both algorithm andproduct descriptions besides sections on applications and constraints. These productspecifications are also available in Appendix II of this Handbook.• two, there are product one-pagers for each of these products that are available from LP-DAAC (http://edcdaac.usgs.gov/aster/asterdataprod.html). These provide a brief productdescription, data set characteristics, image dimensions, file sizes, search and orderinginformation, and links to algorithm, documentation etc.].Level-2 products (the Short-Names also provide links to the LP-DAAC Product One-Pagers):Routinely Produced at ECS-EDAAC1. ASTER Level-2 Decorrelation Stretch Product (VNIR) AST_06V2. ASTER Level-2 Decorrelation Stretch Product (SWIR) AST_06S3. ASTER Level-2 Decorrelation Stretch Product (TIR) AST_06T81