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HDF & HDF-EOS Workshop VIII 2004 October 26-28 Aurora, CO

Subsetting at UAH. HDF & HDF-EOS Workshop VIII 2004 October 26-28 Aurora, CO. Bruce Beaumont, Matt Smith, Helen Conover, Sara Graves. Why Subset?. Goal: to provide a science data user with only the data they need as quickly as possible.

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HDF & HDF-EOS Workshop VIII 2004 October 26-28 Aurora, CO

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  1. Subsetting at UAH HDF & HDF-EOS Workshop VIII 2004 October 26-28 Aurora, CO Bruce Beaumont, Matt Smith, Helen Conover, Sara Graves

  2. Why Subset? • Goal: to provide a science data user with only the data they need as quickly as possible. • Benefits science data users and data centers:- Reduces analysis time by reducing amount of data- Reduces time for data delivery- Reduces resources (network, personnel, media, etc.) • Steps:- Locate spatial / temporal / spectral area of interest- Extract- Re-assemble for distribution/use

  3. What is HSE?HEW Subsetting Engine A new packaging option for the HDF-EOS Subsetter designed for users that want subsetting, but do not want to host the full HEW installation or even the standalone HEW back-end.

  4. What is HEW? • HDF-EOS Web-based Subsetter • Prototype software designed to be dataset-independent (HDF-EOS) • Funded by NASA/ESDIS for EOS-DIS • To be used within ECS (EOS-DIS Core System) • Original Front-end/GUI (optional) • Uses HTML forms and JavaScript • Original Back-end • Needed subset criteria and HDF-EOS data • Performed subsetting as a “batch” job

  5. What are HSE’s capabilities? • Versions available for HDF-EOS 2 and HDF-EOS 5. • Subsets multiple files in one call. • Subsets properly-formatted HDF-EOS grid and swath objects. • Subsets spatially by latitude/longitude or row/column. • Subsets swaths temporally by date/time range. • Subsets swaths by full or partial (subscan) lines. • Subsets spectrally by HDF-EOS field. • Subsamples along any dimension by stride (repeating interval) or by discrete index list. (see chart) • Copies all file and field attributes to the output file and updates HDF-EOS “core” metadata when possible.

  6. Stride Subsampling on a Dimension • STRIDE = 2 Selected • Indexed Subsampling on a Dimension • INDEXES = (1, 3, 4, 5, 7) Selected

  7. Existing HEW Back-End Architecture • Front end supplies subsetting criteria file • Subsetter writes messages to status file • Subsetter writes messages to log file • Subsetter sends e-mail to end-user Many sites do not want to create ODL files or the hassle of dealing with message or log files or e-mail.

  8. New HSE Architecture • User application code builds subsetting criteria structure • Subsetting engine function calls user’s functions for status and log messages • No e-mail is sent All subsetting functionality is contained within a callable function

  9. SPOT • Subsettability “checker” • Displays content/structureof HDF-EOS4 (or HE5) files • Examines files for subsettability by HSE • Simple command-line interface • Stand-alone operation • Available at subset.org

  10. HEW integration with ECS

  11. Product Availability Matrix

  12. Currently Available/Planned Subsetting Applications • HDF-EOS Subsetting Engine (HDF-EOS, HE5)Status Deployments • Complete System available GHRC • Subsetting Engine Only available GSFC • SPOT - Subsettability Checker available many • HSE Integrated with ECS Data Order System available NSIDC, EDC • HSE Integrated with AMSR-E Processing available AMSR-E SIPS • Subsetting as a Web Service planned (ECHO) • Customized Subsetting • MODIS tools available Science teams • Coarse-grain SSM/I Subsetter available GHRC • General Purpose Customizable Subsetting • Subsetting Tool using ESML in work (various)

  13. http://subset.org

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