Presentation is loading. Please wait.

Presentation is loading. Please wait.

WCS :: OGC Bonn 2005-nov-09 Some GALEON Results for WCS OGC, Bonn, 2005-nov-09 Peter Baumann International University Bremen, rasdaman GmbH

Similar presentations


Presentation on theme: "WCS :: OGC Bonn 2005-nov-09 Some GALEON Results for WCS OGC, Bonn, 2005-nov-09 Peter Baumann International University Bremen, rasdaman GmbH"— Presentation transcript:

1 WCS :: OGC Bonn 2005-nov-09 Some GALEON Results for WCS OGC, Bonn, 2005-nov-09 Peter Baumann International University Bremen, rasdaman GmbH

2 2 WCS :: OGC Bonn 2005-nov-09 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 3 WCS :: OGC Bonn 2005-nov-09 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 4 WCS :: OGC Bonn 2005-nov-09 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 geo2cell-coord cell-indexed coverage

5 5 WCS :: OGC Bonn 2005-nov-09 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. x y t

6 6 WCS :: OGC Bonn 2005-nov-09 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 WCPS

7 7 WCS :: OGC Bonn 2005-nov-09 WCPS language expressions independent from encoding Example: tiff( C.red + C.nir ) KVP encoding: WCPS language + entities where needed Example: ? SERVICE=WCPS & VERSION=0.0.1 & REQUEST=tiff(C.red%20+%20C.nir) & EXCEPTIONS=application/vnd.ogc.se_xml XML encoding: XML Schema Example: WCPS Concepts

8 8 WCS :: OGC Bonn 2005-nov-09 DLR Value-Added Satellite Image Service

9 9 WCS :: OGC Bonn 2005-nov-09 Web Map Service: Example VERSION=1.1.0 & SERVICE=WMS & REQUEST=GetMap & SRS=EPSG:31464 & BBOX= , , , & 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 10 WCS :: OGC Bonn 2005-nov-09 Summary 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) Thank you for your attention!

11 11 WCS :: OGC Bonn 2005-nov-09 Demo Mowglie sections

12 12 WCS :: OGC Bonn 2005-nov-09 value changing operators format converters WCPS Operator Overview Metadata functions general coverage manipulation set operators geometry operations

13 13 WCS :: OGC Bonn 2005-nov-09 work on rasdaman (raster data manager) array algebra + database query language + parallel architecture for large-scale raster services Geo sensor data (1-D) raster maps, (2-D/3-D) Life science Human brain, gene expression simulation Supercomputing climate modelling (4-D) CFD (3-D) astrophysics (4-D) Background


Download ppt "WCS :: OGC Bonn 2005-nov-09 Some GALEON Results for WCS OGC, Bonn, 2005-nov-09 Peter Baumann International University Bremen, rasdaman GmbH"

Similar presentations


Ads by Google