Interoperability Day Introduction Standardsbased Web Services Interfaces to Existing AtmosphericOcea

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Interoperability Day Introduction
Standards-based Web Services Interfaces
toExisting Atmospheric/Oceanographic Data
Systems
Ben Domenico Unidata Program Center Unidata OGC
Interoperability Day September 2007
supported by NSF
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Acronym Glossary

• GALEON (Geo-interface for Air, Land, Environment,
  Oceans NetCDF)
• FES (Fluid Earth Sciences, mainly the data
  systems of the atmospheric and ocean sciences)
• http//www.unidata.ucar.edu/content/publications/a
  cronyms/glossary.html

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Taking Advantage of Web Services for Data System
Interoperability
FES Client Applications
GIS Client Applications
OGC or OPeNDAPTHREDDS, ADDE. FTPprotocols
OpenGIS Protocols WCS, WFS, SOS, GML, CSW
OGC or proprietary GISprotocols
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GALEON (Geo-interface for Air, Land, Earth,
Oceans NetCDF)

• Foster interoperability between data systems of
  FES and GIS communities
• Provide standard interfaces, e.g.,
• Web Coverage Service (WCS)
• Web Feature Service (WFS)
• Sensor Web Enablement (SWE)
• Catalog Services for the Web (CSW)
• To existing netCDF/THREDDS services, e.g.,
• HTTP access to netCDF
• OPeNDAP client/server protocol
• THREDDS catalogs

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CS-W Client
WCS Client
NcMLGML
getCapabilities
geoTIFF
getCoverage
netCDF
describeCoverage

WCS coverage
NetCDF
GMLgenerator
geoTIFFgenerator
NcML-G metadata
THREDDS catalogs
OPeNDAP
ADDE
THREDDS catalogs enhanced with NcML-GML
NetCDF/OPeNDAP data server
netCDF objects
OPeNDAP
ADDE
NetCDF dataset
THREDDS enhanced catalog generation tools

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Phase 2 Issues

• Is WCS 1.1 adequate for serving netCDF datasets
  such as those on the servers at Unidata, the
  University of Florence, George Mason University,
  NERC, NCDC, and the PFEL, and others?
• In the context of serving traditional netCDF
  datasets, what's the relationship between WCS and
  other standard specifications?

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WCS for Other Dataset Types

• GALEON 1 focus on 5D forecast model output
• For GALEON 2?
• point or "station" observations
• vertical profile and trajectory datasets
• swath data from polar orbiting satellites
• radial data from radar stations

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General Dataset Categoriesfrom RAL features
workshop

• Unidata CDM
• Gridded datasets
• Collections of station observations
• Vertical profile and trajectory datasets
• Swath data from polar orbiting satellites
• Radial data from ground-based radar stations

• CSML Scientific Features
• GRID
• Profile
• Ragged section
• Scanning radar
• Profile series

• OGC SWE Sampling Feature Classes
• A Station samples the world at a point,
• a Profile along a curve,
• a SurfaceOfInterest on a surface,
• and a SolidOfInterest in a solid region.

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Grids and Station Observations
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WCS and other OGC Specs

• Need standards-based catalogs for collections of
  datasets (CSW-ebRIM?)
• Relationship between CSW and getCapabilities
  lists
• Collections of point time series data (WCS, WFS,
  or SOS)
• GML dialects
• ncML-GML
• CSML
• GMLJP2

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Clients
CF-netCDFCoverages
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WCS, WFS, SOS, CS-W Clients
CS-Wdiscoveryfor allresources
CF-netCDFCoverages
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Questions for Participants

• Whats the right mix and architecture of
  standards-based web services?
• Is there anything your organization can
  contribute in the next six months to a year?
• clients
• servers
• testing
• To get your part done, whats needed from others?

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For More Information

• OGC documentshttp//portal.opengeospatial.org/in
  dex.php?mprojectsaviewproject_id173
• Status of implementations and interoperability
  testshttp//galeon-wcs.jot.com/WikiHome
• ben_at_unidata.ucar.edu

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References

• netCDFhttp//my.unidata.ucar.edu/content/software
  /netcdf/index.html
• GALEONhttp//my.unidata.ucar.edu/content/projects
  /THREDDS/GALEON/GALEON-Activity-Plan.htm
• Acronym Glossaryhttp//my.unidata.ucar.edu/conten
  t/publications/acronyms/glossary.html