Hi, I can see that OGC has considered EPSG:4326 too hard to handle so there not any mention about it in the examples included in the WCS 1.1.0 standard. From version 1.1.2 corrgendum 2 I can find one, but it is rather hard to read because it is giving an rotated grid as an output. I cannot find anything about WCS 1.1.1 which you are using in your requests.
The 1.1.2 example is this EXAMPLE 1 Here is an example GridCRS that references this OperationMethod encoded in XML: <?xml version="1.0" encoding="UTF-8"?> <GridCRS xmlns="http://www.opengis.net/wcs/1.1"; xmlns:gml="http://www.opengis.net/gml"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="http://www.opengis.net/wcs/1.1 ../wcsGridCRS.xsd" gml:id="example2dGridCrs2"> <gml:srsName>2D Grid CRS Example 3</gml:srsName> <GridBaseCRS>urn:ogc:def:crs:EPSG:6.6:4326</GridBaseCRS> <GridType>urn:ogc:def:method:WCS:1.2:grid2dIn3dMethod</GridType> <GridOrigin>0 0 0</GridOrigin> <GridOffsets>0.0707 0.0707 0 -0.1414 0.1414 0</GridOffsets> <GridCS>urn:ogc:def:cs:OGC:0.0:Grid2dSquareCS</GridCS> </GridCRS> The explanation text is " The six numbers in GridOffsets define a grid that is level to the ground plane but rotated at 45 degrees counterclockwise relative to the easting / northing axes, with a grid spacing of 0.1m (in the SW-NE direction) and 0.2m (NW-SE)." I have been trying to draw the resulting grid on a piece of paper but unfortunately it goes over my understanding. In your example I wonder if the northing component of the GridOffsets should be negative because your GridOrigin is set into the top-left corner. -Jukka Rahkonen- Radim Blazek wrote: > On Wed, Aug 8, 2012 at 10:39 PM, Andrea Aime <andrea.aime@geo- > solutions.it> wrote: > > On Wed, Aug 8, 2012 at 9:47 PM, Radim Blazek <[email protected]> > wrote: > >> > >> Hi, > >> I cannot get correct response from WCS 1.1.1, the result is rotated. > >> The server is here: > >> > >> http://www.sogeo.ch/geoserver/wcs > >> > >> request: > >> > >> > >> > http://www.sogeo.ch:80/geoserver/wcs?SERVICE=WCS&VERSION=1.1.1&RE > QUES > >> > T=GetCoverage&FORMAT=image/tiff&IDENTIFIER=Img_Sample&BOUNDIN > GBOX=21. > >> 5843815789473652,-129.8681617142856908,53.2349184210526332,- > 62.988918 > >> > 2857142913,urn:ogc:def:crs:EPSG::4326&GRIDBASECRS=urn:ogc:def:crs:EPS > >> G::4326&GRIDORIGIN=53.2349184210526332,- > 129.8681617142856908&GRIDCS=u > >> > rn:ogc:def:cs:OGC:0.0:Grid2dSquareCS&GRIDTYPE=urn:ogc:def:method:WCS > : > >> > 1.1:2dSimpleGrid&GRIDOFFSETS=1.7583631578947370,1.9670365714285709 > >> > >> returns rotated raster. I have checked all params and I believe that > >> with GRIDTYPE=urn:ogc:def:method:WCS:1.1:2dSimpleGrid it should > never > >> be rotated. > > > > > > Hi Radim, long time no see. > > The WCS spec uses the urn: form, urn:ogc:def:crs:EPSG::4326, that > > mandates the data to be expressed in lat/lon order, GeoServer respects > > that to the letter. > > Yes, the request above has lat/lon order in BOUNDINGBOX, GRIDORIGIN and > GRIDOFFSETS (North America), that is not a problem. > > > However you are right, the spec says no rotation allowed: > > > > GridType: default is "urn:ogc:def:method:WCS:1.1:2dSimpleGrid" > > (This GridType disallows rotation or skew relative to the GridBaseCRS > > - therefore GridOffsets has only two numbers.) > > > > Now... is it possible to maintain lat/lon axis order and still use > > 2dSimpleGrid? > > Why not? Anyway, can you find in GeoServer code the place where the > output is rotated with params given above? > > >> Does somebody has any idea? Are the params wrong? Which free WCS > >> client is known to work with GeoServer WCS 1.1.1? > > > > The was no released WCS client to use at the time, GeoServer is the > > reference implementation, it was tested as such, nobody from OGC > > complained. > > However I believe Frank tried out GDAL against GeoServer too in that > > time, can't remember outstanding issues there either. > > GDAL does not work with WCS 1.1 in geographic CRS because it does not > switch axis order. > > >> The result with 1.1.1 is also larger by 1 pixel in each direction > >> (1.0.0 works OK), is it taken into account that 1.1.1 grid is using > >> cell centers, not edges? > > > > OGC mandates cell centers as the one and only way to deal with raster > > data as far as I know, I believe we should be using it on both WCS > > versions but I'm not sure, they were implemented by two different > > people and the code paths are quite different. > > AFAIK, the WCS version 1.0 should use cell edges (bbox) like WMS 1.x does. > > Radim > > > Cheers > > Andrea > > > > -- > > == > > Our support, Your Success! Visit http://opensdi.geo-solutions.it for > > more information. > > == > > > > Ing. Andrea Aime > > @geowolf > > Technical Lead > > > > GeoSolutions S.A.S. > > Via Poggio alle Viti 1187 > > 55054 Massarosa (LU) > > Italy > > phone: +39 0584 962313 > > fax: +39 0584 962313 > > mob: +39 339 8844549 > > > > http://www.geo-solutions.it > > http://twitter.com/geosolutions_it > > > > ------------------------------------------------------- > > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and threat > landscape has changed and how IT managers can respond. Discussions will > include endpoint security, mobile security and the latest in malware threats. > http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Geoserver-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geoserver-users ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Geoserver-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-users
