[gdal-dev] Control overview block size

[Etienne B. Racine]

Hi List,

Is there a way to control the block size of overviews and inspect that
block size from gdalinfo ?
I have a raster with 256x256 block size.
Band 1 Block=256x256 Type=Byte, ColorInterp=Red
Band 2 Block=256x256 Type=Byte, ColorInterp=Green
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue

I'm trying to feed the images to a program that seemingly supports Tiffs
with internal overview of the same block size than the image.

I've tried >gdaladdo --config BLOCKXSIZE 256 --config BLOCKYSIZE 256
image.tif 2 4 8 16 32
gdalinfo:
Band 1 Block=256x256 Type=Byte, ColorInterp=Red
  Overviews: 8655x5655, 4328x2828, 2164x1414, 1082x707, 541x354
Band 2 Block=256x256 Type=Byte, ColorInterp=Green
  Overviews: 8655x5655, 4328x2828, 2164x1414, 1082x707, 541x354
Band 3 Block=256x256 Type=Byte, ColorInterp=Blue
  Overviews: 8655x5655, 4328x2828, 2164x1414, 1082x707, 541x354

But I couldn't find a way to inspect the overview block size to confirm
they are 256x256 since I get the same results if I set BLOCKSIZE to 128. I
suspect these options are ignored in gdaladdo.

Any way I can 1) control the overview block size and 2) inspect the block
size ?

Thanks for your help,
Etienne
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