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Some GALEON Results for WCS OGC, Bonn, 2005-nov-09

Some GALEON Results for WCS OGC, Bonn, 2005-nov-09. Peter Baumann International University Bremen, rasdaman GmbH email: p.baumann@iu-bremen.de. IUB @ GALEON. Implementation of a WCS server based on a raster DBMS XML / SOAP Intermediate results

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Some GALEON Results for WCS OGC, Bonn, 2005-nov-09

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  1. Some GALEON Results for WCSOGC, Bonn, 2005-nov-09 Peter Baumann International University Bremen,rasdaman GmbH email: p.baumann@iu-bremen.de

  2. IUB @ GALEON • Implementation of a WCS server based on a raster DBMS • XML / SOAP • Intermediate results • Specification of GetCoverage coverage data result • List of editorial change requests • Issues • Decision WCS.RWG: incorporate in WCS 1.1

  3. GetCoverage Evaluation Model select source coverageperform spatial subsettingperform temporal subsettingperform range subsetting (*)perform spatial scaling into result bbox (*)perform reprojection into target CRS (+)perform data format encodingtransmit resulting byte string to target location (*) including interpolation as specified (+) may involve implicit range interpolation and, hence, accuracy loss, depending on the format chosen discussion appreciated

  4. geo2cell-coord cell-indexed coverage Issues (1) • Q: If I have a coverage with temporal domain { [0:3], [7:10]}, and I select T=5 – what is the result? What if T=20?A: in both cases, an exception has to be reported. • Q: Is there any scaling / interpolation along the time axis?A: Currently not foreseen. • Proposal: make "grid" (ie, cell/pixel/voxel/…) coordinates visible to clients

  5. y t x Issues (2) • Q: the correspondence of BoundingBox and SpatialSubset in a GetCoverage request is not clear. • Q: When is dimension of result coverage reduced wrt. original coverage?A: Currently not foreseen, however considered useful.

  6. WCPS • Side effect of coverage result spec:good basis for value-added services • Under work: WCPS = Web Coverage Processing Service = coverage retrieval & processing • expression language • Declarative = describe what you want, not how to compute • based on model & functionality of WCS

  7. WCPS Concepts • WCPS language expressions independent from encoding • Example: tiff( C.red + C.nir ) • KVP encoding: WCPS language + entities where needed • Example:http://myhost/myservice ? SERVICE=WCPS & VERSION=0.0.1 & REQUEST=tiff(C.red%20+%20C.nir) & EXCEPTIONS=application/vnd.ogc.se_xml • XML encoding: XML Schema • Example:<formatEncoding format="tiff"> <binaryPlus> <structSelection component=„red“ coverage=„C“/> <structSelection component=„nir“ coverage=„C“/> </binaryPlus></formatEncoding>

  8. DLR Value-Added Satellite Image Service

  9. Web Map Service: Example http://myServer/wmsServlet?VERSION=1.1.0 &SERVICE=WMS & REQUEST=GetMap &SRS=EPSG:31464 &BBOX=4636000.0,5717000.0,4687000.0,5768000.0 &LAYERS=ortho,DEM,waterareas,waterlines &STYLES=standard,custom,AdV,AdV &WIDTH=246 & HEIGHT=300 &FORMAT=image/jpeg &EXCEPTIONS=application/vnd.ogc.se_inimage & … SELECT jpeg( scale(img0[...],[1:246,1:300]) * { 1c, 1c, 1c} overlay ((scale(img1[...],[1:246,1:300])<71.0))* { 51c, 153c, 255c} overlay bit(scale(img7[...],[1:246,1:300]), 4) * {191c, 255c, 255c} overlay bit(scale(img8[...],[1:246,1:300]), 1) * { 0c, 255c, 255c} ) FROM ...

  10. Summary Thank you for your attention! • GetCoverage result spec • Database-backed WCS under way • Operational next 2-3 weeks • WCPS = WCS + coverage processing expression language • demo implementation started (student thesis work)

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