gdalwarp change spatial resolution

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I just realized that I have Geo-TIFF's in the samme coordinatesystem but different resolution. DOP20 (20cm=1px) and DOP10 (10cm=1px) mix.Now wanted to use gdalwarp to transform the DOP20 TIFF into DOP 10.The commandline should be simple gdalwarp.exe -tr 20000 20000 -r bilinear in.tiff out.tiffbut gdalwarp complains: Creating outputfile that is 0Px0L Error 1 Attempt to create 0x0 dataset...I thought it is a simple grafik operation, "blowing" a 10000x10000 pixel Tiff into a 20000x20000 Pixel Tiff.Can anybody help me undestanding whats wrong here?



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