WCS GetCoverage Query
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WCS_GetCoverage_Query Description: [[TermDesc::This is the main data query for a WCS service. The request contains Coverage identifier, Geographical BoundingBox and optionally, TimeSequence, fields, and filters for fields. The Coverage Processor for Cubes or Points processes the query and produces data returned to the client.]]
Glossary Domain: WCS
Related Links
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[[Links::Coverage Processor for Cubes Coverage Processor for Points]]
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Term Details
Dissecting a WCS Query
Address, port and provider
http://128.252.202.19:8080/CIRA?
Identifying service, version and request
Service=WCS Version=1.1.2 Request=GetCoverage
Identifying the coverage. Multiple coverages are not allowed.
Identifier=VIEWS
Restricting boundingbox. Longitude range is -100..-90 and latitude range is 30..40
BoundingBox=-100,30,-90,40,urn:ogc:def:crs:OGC:2:84
Selecting time. from 2008-07-02 to 2008-07-08 every three days: 2008-07-02, 2008-07-05, 2008-07-08
TimeSequence=2008-07-02/2008-07-08/P3D
Selecting field SO4f only.
RangeSubset=SO4f
Want text/csv
Format=text/csv
Store the CSV file into the server and return only XML envelope with a pointer to it.
Store=true
Live Query: VIEWS Map slice for SO4f
With
Store=false
the service returns both XML Envelope and the CSV table in one [1] document. Unfortunately, all the browsers cannot handle it, firefox being tested as the only working client.
Live Query: VIEWS Map slice for SO4f with store=false
Filtering by Location Dimension loc_code
RangeSubset=SO4f[location[YOSE1]] selects field SO4f filtering by dimension location by loc_code=YOSE1.
Live Query: VIEWS Map slice for SO4f[location[YOSE1;GRSM1]]
Examples:
Timeseries for one location. RangeSubset both selects fields and filters them by dimensions.
RangeSubset=BEXT[location[13935]] selects field BEXT filtering by dimension location by loc_code=13935.
The parameter store=true makes the return to be an xml document containing some meta information and a url to the CSV result. You need to copy the url from the XML envelope and paste it to address bar to retrieve it yourself.
Same query, but The parameter store=false returns both the XML envelope and the CSV file in the same request.
So far only Mozilla Firefox can open it automatically. Internet Explorer, Safari and Chrome are not recommended here.
