[Mapserver-users] Tiling Tif Images

[Chip Hankley]

Stefan:

> a) the images I have (100-500 MB) are not yet tiled; and I assume it
would 
> result in a better performance if they would be.

Yes. You should also review the archives on notes from Ed (and others)
regarding image performance in general. Tiling is only one part of the
equation. Another *very* important thing is to make sure you are using
images of appropriate resolution. For instance, if you're displaying
orthophotos with 6" pixels at 1:20,000, you're processing WAY more data
than you can display... so developing pyramids or other display schemes
to minimize this kind of overhead is important. 

> c) I did not succeed in finding the gdaltindex file, which seems to
be 
> necessary to do the tiling of images.
> 
I haven't done this for about 6 months, but as I recall, gdaltindex
does not do the tiling, per se. The utility creates a shapefile that
acts as the *index* to the tiles. YOU need to create the tiles. There
are, as some have indicated, a lot of ways to do this. There may be some
tools in gdal that do this, certainly you can do it in many GIS
packages. There's an AML in the WIKI that will do it if you have access
to ArcInfo w/ GRID. Conceivably, you could do it "by hand" with an image
editing package (like Paint Shop Pro) by slicing up the image into
regular tiles and creating new world files.

Chip

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