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An HDF-EOS Data Server Based on OPeNDAP and ECHO

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Information about An HDF-EOS Data Server Based on OPeNDAP and ECHO
Technology

Published on February 19, 2014

Author: HDFEOS

Source: slideshare.net

Description

We describe a data server for publishing HDF-EOS datasets to the web. This system makes HDF-EOS datasets:

o Findable - the datasets are visible on the web to their intended users, both in generic web search engines and in domain-specific search tools like ECHO.
o Browseable - each dataset has a web page associated with it that displays its metadata readably, and has links to allow fetching the data.
o Retrievable - for each dataset, there is a way to retrieve:
- The whole dataset
- Just the metadata
- Individual fields from the dataset
- Partial, sectorized data from fields
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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 • Readable metadata • Links for fetching data • Retrievable – – – – Whole dataset Metadata only Individual fields Sectorized fields

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

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

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

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

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

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

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

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

Granule Web Pages

Granule Web Pages

Granule Web Pages

Granule Web Pages

Screen shot Showing link dragged into DODS client

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

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