[Gdal-dev] image tile question

[Haobo Yu]

Frank,

I'll try it out.  To me, internal GeoTIFF tiling is a much more elegant
solution than cutting an image to pieces.  I'm glad that I don't have to
do the latter.

Thanks so much for your quick reply and clear instruction.

(And I have been enjoying your gdal a lot.  It's a marvel to me that you
have thin-plate transform built-in!)

Best,
Haobo

> My general advice would be to use internal GeoTIFF tiling, and build
> overviews.  For example:
> 
> gdal_translate -co TILED=YES old.tif new_tiled.tif
> gdaladdo new_tiled.tif 2 4 8 16 32 64 128
> 
> This format should work quite efficiently with MapServer in many
> use patterns, and is easy to manage.  Luckily 10K x 10K especially large
> though it is substantial.
> 
> > (2) If I need to create smaller tile images, is there a good tool/script
> > to cut a large GeoTIFF file?  I don't mind writing one, but didn't want
> > to reinvent the wheel, either.
> 
> I'm not aware of a script, but you can use the gdal_translate to cut
> out a chunk of an image, assigning appropriate georeferencing.
> 
> For instance:
> 
> gdal_translate -srcwin 0 0 2000 2000 in.tif out_0_0.tif
> gdal_translate -srcwin 2000 0 2000 2000 in.tif out_1_0.tif
> ...
> 
> Best regards,