[gdal-dev] vrt performance with 1000's of tiles?

Matt Klaric matt at klaric.com
Mon Apr 5 15:33:59 EDT 2010

On Mon, Apr 5, 2010 at 2:20 PM, William Kyngesburye
<woklist at kyngchaos.com>wrote:

> I thinking of creating a vrt for approx 19000 geotiff DEM tiles (SRTM).
>  Any comments on the performance or practicality of this?  Is there a
> difference in performance between Geotiff and GRASS as the tile format?
> Mainly it's so I can easily extract regions for projects, so it would be
> one-shot gdal_translate runs.
I've done something similar.

Check out the SourceProperties tag in http://www.gdal.org/gdal_vrttut.html.
If you specify that for each source image, then GDAL doesn't have to open
all 19000 images at runtime.  The performance is quite good.

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