[ka-Map-users] Improving ka-map speed with non-cached WMS?

Stephen Woodbridge woodbri at swoodbridge.com
Mon Dec 14 23:34:48 EST 2009

This is a little of topic for this list, and you might want to join the 
GDAL list if you need more help on this topic.

gdalinfo myfile.jpg
gdalwarp -of GTiff -co "TILED=TRUE" myfile.jpg myfile.tif
gdalinfo myfile.tif


??? wrote:
> hello Stephen,
>    I do not understand how you get you images converted to umcompressed 
> GTIFF. I have some .jpg images and .jgw world files with them. I want to 
> convert them to GTIFF pictures with GEO information internal. Can you 
> describe how I can implement it clearly ?
>   Thank you!
> On Tue, Dec 15, 2009 at 7:01 AM, Stephen Woodbridge 
> <woodbri at swoodbridge.com <mailto:woodbri at swoodbridge.com>> wrote:
>     There may be other or even better ways of dealing with this, but my
>     strategy has been convert all the imagery to uncompressed GTIFF data
>     using an internal tiled format which is the most efficient for mapserver
>     to access. And then to run gdaladdo on top of those. Really large files
>     will probably need to be tiled into smaller tiles and then built a
>     tileindex to stitch it all back together again. This will give you good
>     mapserver performance at the cost of disk space. If you data is getting
>     update and you need to remove old imagery and replace it, then use some
>     kind of directory structure to help manage that, for example if you have
>     a file xxx.sid create a directory xxx_sid and put the tiles in there.
>     then if you need to replace xxx.sid in the future it is easy to remove
>     the old tiles and create new ones.
>     YMMV,
>       -Steve

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