[gdal-dev] running gdal_merge for a lot of files

[Roger André]

There are probably several different ways to approach this, the following
are 2 that have worked for me in the past when gdal_merge.py has had
problems.

1) Assuming all of the tiles are in the same projection and resolution, use
gdalwarp to create the mosaic.
or
2) Since you are using version 1.6.1 of gdal, you could try using the
"gdalbuildvrt" utility to create a virtual mosaic.  I suspect it might be
possible to use the VRT as the input source to create overviews.
--


On Fri, Jun 26, 2009 at 12:46 AM, Pavel Iacovlev
<iacovlev.pavel at gmail.com>wrote:

> Good day all,
>
> I am trying to merge a large data set, the input imagery is 1TB RGB
> uncompressed tifs (lots of them). Then I run gdal_merge.py on a small
> data set it runs ok and with -v option I can see whats happening. But
> then I run on a large dataset I don't get no verbose output (I don't
> get no output at all) and it stuck on 8.9 GB image size. I can just
> track that the image is getting bigger but not verbose output
> whatsoever and I can tell why it stops on 8.9 GB.
>
> My command is: gdal_merge.py -v -init 255 -of GTiff -co TILED=YES -co
> COMPRESS=JPEG -co PHOTOMETRIC=YCBCR -co BIGTIFF=YES -o of.tif of/*.tif
>
> The input images are around 160mb each so loading them 1 by 1 into
> memory is not a problem.
>
> I want to join all this imagery into 1 big tif and create overviews to
> serve it via mapserver.
>
> GDAL version: GDAL 1.6.1, released 2009/05/11
>
> --
> http://iap.md, The future is open
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