[Gdal-dev] tiling/conversion

[Frank Warmerdam]

Kevin Flanders wrote:
> Can I use gdal to create tiles from a large tiff image and convert to 
> ecw at the same time? 

Kevin,

Yes, you could have gdal_translate pull a subarea out of a source file,
and write it to an ECW all in one command.

> How do I create the individual tiles?  

With gdal_translate you would need to invoke the command once for each
tile you want to produce.  Not something you want to do by hand for any
number of files!

 > Can I use
> translate, and pass a tileindex shapefile to support the clipping 
> bounding boxes to create the individual tiles....and convert on the fly?

The gdal_translate command doesn't know how to use a tileindex.  But a
script could be written to use a tileindex to cut up a big image into tiles.
That is assuming the polygons in the tileindex are simple rectangles.

Basically, currently breaking images into tiles either involves some sort
of script or other.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGF, http://osgeo.org