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Has anyone come across a shareware/freeware tool for analysing the overlays and tiling (i.e the internal indexing) of GeoTIFF images?

What would be excellent would be something like a GeoTIFF tuning advisor...

Back in my Intergraph days, we had such a tool. It allowed us to have multi-gigabyte TIFFs being displayed in maps with subsecond performance.

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I'm not sure what you mean by "analyse" but is GDAL's gdal_retile what you are looking for?

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Just a simple UI that can tell me whether overlays have been set and what the tiling settings are. I'd like to use GDAL more, but my Python skills need some work.. –  minus34 Nov 9 '11 at 22:51
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try gdalinfo (gdal.org/gdalinfo.html) to give you that sort of simple overview of the GeoTiff. –  iant Nov 10 '11 at 8:33
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