Andrea,
thanks a lot for your reply. I am aware of the different ordering in the
coordinates. I'v been trying to track down the problem a little further.
When I use only EPSG:4326 in the request I do get the correct image
returned. But when using urn:ogc:def:crs:EPSG:4326 instead (and switching
from lon/lat to lat/lon coordinates) the image returned is flipped and
rotated, regardless of the viewing software (I tried QGIS & ArcGIS).
I also double-checked the same image on a another Geoserver instance we are
running (GS 2.0.2), and surprisingly both requests result in exactly the
same image. So the problem occurs only with GS 2.1.0beta1. I suspect there
is either a bug or more parameters need to be specified.
for your reference here are the two requests I used:
http://localhost:8090/geoserver/ows?service=WCS&version=1.1.1&request=getCoverage&identifier=sbsc:MOD11C3.A2000061.005.2006273174935_MODIS_MONTHLY_0.05DEG_CMG_LST_day&boundingbox=50,50,180,80,EPSG:4326&format=image/geotiff&GridBaseCRS=EPSG:4326&store=true
http://localhost:8090/geoserver/ows?service=WCS&version=1.1.1&request=getCoverage&identifier=sbsc:MOD11C3.A2000061.005.2006273174935_MODIS_MONTHLY_0.05DEG_CMG_LST_day&boundingbox=50,50,80,180,urn:ogc:def:crs:EPSG:4326&format=image/geotiff&GridBaseCRS=urn:ogc:def:crs:EPSG:4326&store=true
thanks again for looking into this,
Roman
On Sat, Dec 4, 2010 at 10:11 AM, Andrea Aime
<[email protected]>wrote:
> On Sat, Dec 4, 2010 at 1:26 AM, Roman Gerlach <[email protected]>
> wrote:
> > Hi all,
> >
> > We have set up a Geoserver 2.1.beta1 on Ubuntu 8.04 with a few hundred
> MODIS
> > images; all in GeoTIFF processed with gdal and of equal dimension and
> > coordinate system (EPSG:4326); including internal tiles and overviews.
> All
> > works nicely with WMS, but when I'm trying to retrieve a single GeoTIFF
> (no
> > re-projecting) with the following WCS getCoverage KVP request I run into
> > trouble.
> >
> >
> http://localhost:8090/geoserver/ows?service=WCS&version=1.1.1&request=GetCoverage&BoundingBox=50,50,80,180,urn:ogc:def:crs:EPSG:4326&identifier=sbsc:MOD11C3.A2000061.005.2006273174935_MODIS_MONTHLY_0.05DEG_CMG_LST_day&format=image/geotiff&store=true
> >
> > The image returned is rotated by 90 deg and mirrored.
> >
> > I tried to add a few more parameters:
> >
> >
> http://localhost:8090/geoserver/ows?service=WCS&version=1.1.1&request=GetCoverage&BoundingBox=50,50,80,180,urn:ogc:def:crs:EPSG:4326&identifier=sbsc:MOD11C3.A2000061.005.2006273174935_MODIS_MONTHLY_0.05DEG_CMG_LST_day&format=image/geotiff&store=true&gridBaseCRS=urn:ogc:def:crs:EPSG:4326&gridOffsets=0.05,0.05
> >
> > This solves the mirror effect, but not the rotation. It seems there is
> > something else missing, but I can't figure out what. Any hint?
>
> OGC mandates urn:ogc:def:crs:EPSG:xywz syntax uses the same axis order
> as in the EPSG
> database. For 4326 and all other geographic coordinate reference
> systems that means lat/lon.
> So the result you get is to be expected, it's flipped because it's
> lat/lon instead of lon/lat, GIS aware
> systems should be able to use it and display it properly.
> Tried it out and both uDig and QGis could display the results properly
> (that is, non flipped)
> Of course a simple image viewer wouldn't.
>
> Cheers
> Andrea
>
> -----------------------------------------------------
> Ing. Andrea Aime
> Senior Software Engineer
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
>
> phone: +39 0584962313
> fax: +39 0584962313
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
> -----------------------------------------------------
>
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