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&REQUEST=GetCoverage&FORMAT=image/tiff&IDENTIFIER=Img_Sample&BOUNDINGBOX=21.5843815789473652,-129.8681617142856908,53.2349184210526332,-62.9889182857142913,urn:ogc:def:crs:EPSG::4326&GRIDBASECRS=urn:ogc:def:crs:EPSG::4326&GRIDORIGIN=53.2349184210526332,-129.8681617142856908&GRIDCS=urn: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<http://www.sogeo.ch/geoserver/wcs?SERVICE=WCS&VERSION=1.1.1&REQUEST=GetCoverage&FORMAT=image/tiff&IDENTIFIER=Img_Sample&BOUNDINGBOX=21.5843815789473652,-129.8681617142856908,53.2349184210526332,-62.9889182857142913,urn:ogc:def:crs:EPSG::4326&GRIDBASECRS=urn:ogc:def:crs:EPSG::4326&GRIDORIGIN=53.2349184210526332,-129.8681617142856908&GRIDCS=urn:ogc:def:cs:OGC:0.0:Grid2dSquareCS&GRIDTYPE=urn:ogc:def:method:WCS:1.1:2dSimpleGrid&GRIDOFFSETS=1.7583631578947370,1.9670365714285709>,
that
mandates
the data to be expressed in lat/lon order, GeoServer respects that to the
letter.
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?
> 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.
>
> 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.
Cheers
Andrea
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