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THREDDS Data Server

THREDDS Data Server. Ethan Davis GEOSS Climate Workshop 23 September 2011. THREDDS Data Server (TDS). Provides web services for scientific data Catalogs available datasets Data access/subset services Dataset collections services Metadata services. THREDDS Data Server (TDS).

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THREDDS Data Server

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  1. THREDDS Data Server Ethan Davis GEOSS Climate Workshop 23 September 2011

  2. THREDDS Data Server (TDS) • Provides web services for scientific data • Catalogs available datasets • Data access/subset services • Dataset collections services • Metadata services

  3. THREDDS Data Server (TDS) • Built on the netCDF-Java library • Reads various data formats: • netCDF-3, netCDF-4 • GRIB-1, GRIB-2, BUFR • HDF-4, HDF-5, HDF-EOS • … • Recognizes various Scientific Feature Types • Gridded Data; Radial Data; Swath Data • Discrete Sampling Features: • Point Data; Station Data; Profile Data • Trajectory (e.g., aircraft track) Data

  4. Gridded Data

  5. Radial Data

  6. Point/Station Data

  7. Profile Data

  8. Trajectory/Track Data

  9. THREDDS Data Server (TDS) • Catalogs of available datasets: • Hierarchical presentation of dataset collections • Advertises services available for each datasets • Contains metadata about each dataset

  10. THREDDS Data Server (TDS) • Data access services: • HTTP file download • OPeNDAP • WMS (1.1.1 & 1.3.0) and WCS (1.0.0) • NetCDF Subset Service (NCSS) • Feature Collection Subset Services • Point/Station Collections • Radar Station Collections

  11. THREDDS Data Server (TDS) • Data collection services • Aggregation • Point/station collection • Metadata services • THREDDS • ncISO: ISO, UDDC, NcML

  12. Climate & Forecast (CF)Metadata Conventions • Standard names for data variables • Coordinate variables and CRS • Scientific Feature Types • Climatological statistics • Calendars (e.g., years made up of 360 days)

  13. Future Work • Coordinate Reference Systems • CF doesn’t require some important details (e.g., datums). • CF has limited ability to specifying vertical datums • Calendars: e.g., 360 day year • Supported in CF • Not currently supported by netCDF-Java/TDS. However, it will be supported in netCDF-Java/TDS 4.3 • Not sure about support in OGC services • Describing climate anomalies • Describing ensemble model data

  14. Questions? • Ethan Davis, edavis@unidata.ucar.edu • netCDF-Java • http://www.unidata.ucar.edu/software/netcdf-java • netcdf-java@unidata.ucar.edu • THREDDS Data Server • http://www.unidata.ucar.edu/software/tds • thredds@unidata.ucar.edu

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