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Subsetting

Subsetting. University of Alabama in Huntsville Information Technology and Systems Center Matt Smith http://subset.itsc.uah.edu for The 4 th HDF-EOS Vendor Workshop 19-21 September 2000. Outline. HEW Definition Subsetting criteria file Demo HEW2K Subsetting plans Subsetting Portal

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Subsetting

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  1. Subsetting University of Alabama in Huntsville Information Technology and Systems Center Matt Smith http://subset.itsc.uah.edu for The 4th HDF-EOS Vendor Workshop 19-21 September 2000

  2. Outline • HEW • Definition • Subsetting criteria file • Demo HEW2K • Subsetting plans • Subsetting Portal • Integration with ECS • Other plans HDF-EOS Workshop

  3. HEW - What is it? • HDF-EOS Web-based Subsetter • Prototype software designed to be dataset-independent (i.e., HDF-EOS) • Back-end (C) • needs subset criteria file & HDF-EOS data • Front-end/GUI • HTML forms & Javascript • http://subset.itsc.uah.edu HDF-EOS Workshop

  4. HEW back-end • Uses HDF-EOS (and HDF) library • Instructions via a subset criteria file (ODL) • Handles multiple similar files • Handles Swath and/or Grid data • Unix (SGI & Sun) executables available • Subsetted output files contain: • StructMetadata (HDF-EOS) • ArchiveMetadata* • ProductMetadata (added by HEW ODL file) • CoreMetadata* (w/ modified bounding box & time info) • optionally placed in .met file *if present in parent file HDF-EOS Workshop

  5. HEW GUI demo/JavaScript • Demo of http://subset.itsc.uah.edu/hew2k • Uses Dynduo JavaScript library • Works on Netscape and Explorer HDF-EOS Workshop

  6. Subset criteria file • contains: • File(s) to subset Req’d • Parameters/channels Req’d • E-mail address Req’d • Bounding box Opt. • Latitude/Longitude bounds • Row/Column bounds (grids only) • Time range Opt. • Subsampling stride Req’d • Non-geolocated objects Opt. • Output file prefix Opt. • .met file Opt. • Sub-scan subsetting (swaths only) Opt. HDF-EOS Workshop

  7. Sample subset criteria file (ODL) GROUP = SUBSET PARENT_FILE =(“/AQUA/AMSR/AE_L2A.hdfeos”) LATITUDE_RANGE = (35.000000, 40.000000) LONGITUDE_RANGE = (-77.000000, -72.000000) EMAIL = “user@company.com” OUTPUT_PREFIX = “NC_coast” MET_FILE = “YES” GROUP = SPOG NAME = “swath_1” TYPE = “SWATH” PARAMETERS = “89.0V_Res.1_TB”, “89.0V_Res.2_TB”) SUBSAMPLING = (“GeoTrack”, 1, “GeoXtrack”, 1) END_GROUP = SPOG END_GROUP = SUBSET END HDF-EOS Workshop

  8. Subsetting Portal • http://subset.org • Up in December, 2000 • For everyone involved in subsetting • Advertising • Forums • Data • Software • Glossary • Tutorials • Links to specialized subsetters HDF-EOS Workshop

  9. Other Tools • SPOT – Subsettability Checker • eospeek – HDF-EOS file display • hdfpeek – HDF file display • HDF-EOS user’s manual (in work) HDF-EOS Workshop

  10. Plans • HEW • Integration with ECS • Special implementations at data centers • Subsetting Portal • http://subset.org • ADaM • Subsetter/Format Converter • ESML HDF-EOS Workshop

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