Hi list, I'm experimenting with the GTI driver and hitting an issue when trying to add overviews. I'm compiling a large number of adjacent non-overlapping tiles, each of which has is own bundled overviews:
gdalinfo /*snip*/tile-1377-471.tif Size is 32768, 32768 Origin = (3.057607090103000,48.420794507110998) Pixel Size = (0.000004056990000,-0.000002694048000) Band 1 Block=512x512 Type=Byte, ColorInterp=Red NoData Value=0 Overviews: 16384x16384, 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256 Band 2 Block=512x512 Type=Byte, ColorInterp=Green NoData Value=0 Overviews: 16384x16384, 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256 Band 3 Block=512x512 Type=Byte, ColorInterp=Blue NoData Value=0 Overviews: 16384x16384, 8192x8192, 4096x4096, 2048x2048, 1024x1024, 512x512, 256x256 I also have a very low resolution "hat" file that covers the whole work area: gdalinfo /*snip*/lr.tif Size is 2100, 1792 Origin = (1.413084112150000,49.303580186365998) Pixel Size = (0.001045206663490,-0.000689676288000) Band 1 Block=256x256 Type=Byte, ColorInterp=Red NoData Value=0 Overviews: 1050x896, 525x448, 263x224, 132x112 Band 2 Block=256x256 Type=Byte, ColorInterp=Green NoData Value=0 Overviews: 1050x896, 525x448, 263x224, 132x112 Band 3 Block=256x256 Type=Byte, ColorInterp=Blue NoData Value=0 Overviews: 1050x896, 525x448, 263x224, 132x112 I would like to create a GTI dataset referencing all these tiles, and the "hat" dataset, and have created it like so: ogrinfo -so -al mosaic.gti.fgb: Layer name: tileindex Metadata: BAND_COUNT=3 DATA_TYPE=Byte NODATA=0 OVERVIEW_0_FACTOR=2 OVERVIEW_1_FACTOR=4 OVERVIEW_2_FACTOR=8 OVERVIEW_3_FACTOR=16 OVERVIEW_4_FACTOR=32 OVERVIEW_5_FACTOR=64 OVERVIEW_6_FACTOR=128 OVERVIEW_7_DATASET=/*snip*/lr.tif RESAMPLING=bilinear RESX=0.00000269495773407954 RESY=0.00000269495773407954 However when I inspect the gti dataset, the overview count is not what I expect: gdalinfo mosaic.gti.fgb: Size is 814460, 458598 Origin = (1.413084000000000,49.303579999999997) Pixel Size = (0.000002694957734,-0.000002694957734) Band 1 Block=256x256 Type=Byte, ColorInterp=Undefined NoData Value=0 Overviews: 203615x114650, 101808x57325, 50904x28663, 25452x14332, 12726x7166, 6363x3583, 2100x1792 Note the overview list, which I would have expected to be: 407230x229299, 203615x114650, 101808x57325, 50904x28663, 25452x14332, 12726x7166, 6363x3583, 2100x1792, 1050x896, 525x448, 263x224, 132x112 but is not, i.e. it is missing the first overview level of the individual tiles, and the overviews of the hat dataset. Is this a configuration issue on my end ? Thanks, Thomas
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