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An HDF-EOS Data Server Based on OPeNDAP and ECHO

An HDF-EOS Data Server Based on OPeNDAP and ECHO. Bob Bane, Mohammad Rabi, Weijun Su, Richard Ullman, Jingli Yang, Zhangshi Yin Data Usability Group, NASA/GSFC. HDF-EOS data access via web. Findable With standard search engines With domain-specific engines Browseable Per-granule web page

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An HDF-EOS Data Server Based on OPeNDAP and ECHO

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  1. An HDF-EOS Data ServerBased on OPeNDAP and ECHO Bob Bane, Mohammad Rabi, Weijun Su, Richard Ullman, Jingli Yang, Zhangshi Yin Data Usability Group, NASA/GSFC

  2. HDF-EOS data access via web • Findable • With standard search engines • With domain-specific engines • Browseable • Per-granule web page • Readable metadata • Links for fetching data • Retrievable • Whole dataset • Metadata only • Individual fields • Sectorized fields

  3. Intended Audience • Groups that are generating HDF-EOS products • Need a straightforward, inexpensive way to publish them to the web • Major archives already have their own systems - this is for everyone else

  4. Tools used Standard tools Unix shell scripts Apache web server Earth science standards and protocols OPeNDAP ECHO Our tools ODL <-> XML <-> HTML

  5. OPeNDAP “netCDF via HTTP” Also works for HDF 4/5 and HDF-EOS 2/5 http://opendap.org

  6. ECHO EOS ClearingHouse Searchable repository for earth science metadata Based on standard commercial tools Databases E-commerce middleware http://echo.eos.nasa.gov

  7. Our Tools hemu - extracts ODL metadata odl2xml - converts ODL to EOS-compatible XML heex - breaks an HDF-EOS dataset into field files with an HTML/XML table of contents XSLT stylesheets - convert XML to pretty HTML

  8. HDF_EOS files OPeNDAP server Fetch/sectorize hemu heex DODS client ODL metadata Web server Web browser XML contents Field files Browse/fetch odl2xml ECHO client Search/query XML metadata Search engines Pretty HTML XSLT File transfer ECHO XML ECHO server XSLT Web/HTTP Implemented by us Other tools Client-side services

  9. Installation Foundation Unix Apache Java Libraries HDF4/5, HDF-EOS2/5 SDP Toolkit OPeNDAP server Our software heex, odl2xml, hemu heserve scripts

  10. Use Two shell scripts ingest granule-file.hdf Publishes granule to the web echoingest metadata.xml Publishes web links for granule to ECHO Optionally called by ingest

  11. Granule Web Pages

  12. Granule Web Pages

  13. Granule Web Pages

  14. Granule Web Pages

  15. Screen shot Showing link dragged into DODS client

  16. Where is the software? http://hdfeos.gsfc.nasa.gov ’Tools’ link heserve system

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