Hi Scott, gdal complained about the error because geoserver.tif has less pixels than gdal.tif.
But that doesn't help answering my question. >If I run: >gdal_translate -projwin 137.915315044103 -36.51629558851893 154.64770004642423 >-40.081875882617666 geoserver.tif new.tif > It completes with warning: > Warning 1: Computed -srcwin -1 -1 17 4 falls partially outside raster extent. > Going on however. > Try again with your -projwin values within your geoserver.tif extent and see > what happens. On Mon, 3 Apr 2023 at 14:29, Pham Huu Bang <a09...@gmail.com> wrote: > Hello, > > I've a hard time understanding which one should be the correct result by > gdal_translate or GeoServer. > > My system (Ubuntu 22.04) has: > - GDAL 3.4.1 > - Geoserver 2.22 running on Tomcat on port 9090 > > I have a small tiff file (link to download at the bottom of this thread) > in EPSG:4326, then I wanted to have a small subset on Lat and Long axes > from it by running: > > - gdal_translate -projwin 137.915315044103 -36.51629558851893 > 154.64770004642423 -40.081875882617666 test.tif gdal.tif > > > - curl ' > http://localhost:9090/geoserver/wcs?service=WCS&version=2.0.1&request=GetCoverage&format=image/tiff&coverageId=test_raster:output&subset=Lat(-40.081875882617666,-36.51629558851893)&subset=Long(137.915315044103,154.64770004642423)' > -o geoserver.tiff > > - Then gdalinfo gdal.tif returns: > > Size is 17, 4 > > and gdalinfo geoserver.tif returns > > Size is 17, 3 > > - Also the geo bbox of gdal.tif and geoserver.tif are different. > First file gives: > > Upper Left ( 136.9750000, -35.9750000) > > Second file gives: > > Upper Left ( 137.9750000, -36.9750000) > > > More importantly, the pixels are shifted from gdal.tif at the top to > geoserver.tif at the bottom which you can see from this image: > https://imgur.com/a/L0vKvYk > > Here is the link to download test.tif, gdal.tif and geoserver.tif > https://drive.google.com/file/d/1dawCy38FMwx4J7OQsky-gAHHOXsMuDcy/view?usp=sharing > > Please share your opinion which result (gdal.tif or geoserver.tif) should > be correct? > > Thanks, >
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