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

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) ations/acronyms/glossary.htmlhttp:// ations/acronyms/glossary.html

Taking Advantage of Web Services for Data System Interoperability GIS Client Applications FES Client Applications OpenGIS Protocols: WCS, WFS, SOS, GML, CSW OGC or proprietary GIS protocols OGC or OPeNDAP THREDDS, ADDE. FTP…protocols GIS Server GIS Servers Demographic, infrastructure, societal impacts, … datasets THREDDS Server FES Servers Station obs, satellite, radar, forecast model output, … datasets

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

NetCDF/OPeNDAP data server WCS Client … THREDDS catalogs enhanced with NcML-GML WCS capabilities THREDDS interface WCS description THREDDS interface OPeNDAP NetCDF dataset NetCDF OPeNDAP GML generator geoTIFF generator WCS coverage netCDF geoTIFF NcMLGML getCoverage getCapabilities describeCoverage THREDDS enhanced catalog generation tools THREDDS catalogs NcML-G metadata netCDF objects ADDE CS-W Client

Phase 2 Issues 1.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? 2.In the context of serving traditional netCDF datasets, what's the relationship between WCS and other standard specifications?

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

General Dataset Categories from 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.

Grids and Station Observations

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

SOS WCS CF-netCDF Coverages WCS WFS WCS WFS WCS WFS WFS/ WCS Client WCS/WFS Server CSML Sampling Features delivered as CF-netCDF Coverages WCS WCS Client WCS/WFS Server WFS WCS CF-netCDF Coverages ncML-GML Sampling Features delivered as CF-netCDF Coverages THREDDS WCS Server Observation Datasets Model Output Datasets Observing System Unidata Internet Data Distribution System WCS CF-netCDF Coverages Sensor Observation Service SOS Clients

WCS, WFS, SOS, CS-W Clients SOS WCS CF-netCDF Coverages WCS WFS WCS WFS WCS WFS WFS/ WCS Client WCS/WFS Server CSML Sampling Features delivered as CF-netCDF Coverages WCS WCS Client WCS/WFS Server WFS WCS CF-netCDF Coverages ncML-GML Sampling Features delivered as CF-netCDF Coverages THREDDS WCS Server Observation Datasets Model Output Datasets Observing System Unidata Internet Data Distribution System WCS CF-netCDF Coverages Sensor Observation Service SOS CS-W discovery for all resources

Questions for Participants What’s 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, what’s needed from others?

For More Information OGC documents: m=projects&a=view&project_id=173OGC documents: m=projects&a=view&project_id=173 Status of implementations and interoperability tests: of implementations and interoperability tests:

References netCDF e/netcdf/index.htmlnetCDF e/netcdf/index.html GALEON /THREDDS/GALEON/GALEON-Activity- Plan.htmGALEON /THREDDS/GALEON/GALEON-Activity- Plan.htm Acronym Glossary ions/acronyms/glossary.htmlAcronym Glossary ions/acronyms/glossary.html