[Gdal-dev] GDAL_MERGE Memory Error

[Reinaldo Escada Chohfi]

Frank,

Thanks.  It worked.

Also, I would like to ask if you have benchmarks on gdal/FWTools when 
compiled on 64-bit machines vs. the 32-bit.  What about when compiled and 
running on Windows XP 64-bit vs. Fecora Core 4 X64?

Thanks again.

Reinaldo

At 07:27 PM 12/2/2005, Frank Warmerdam wrote:
>On 12/2/05, Reinaldo Escada Chohfi <rec at geodesign.com.br> wrote:
> >  Hello everyone,
> >
> >  I'm running gdal_merge.py and get the following memory allocation error
> > when using the -n 0 flag:
> >
> >  Traceback (most recent call last):
> >    File "gdal_merge.py", line 478, in ?
> >      fi.copy_into( t_fh, band, band, nodata )
> >    File "gdal_merge.py", line 288, in copy_into
> >      nodata_arg )
> >    File "gdal_merge.py", line 110, in raster_copy
> >      nodata )
> >    File "gdal_merge.py", line 147, in raster_copy_with_nodata
> >      nodata_test = Numeric.equal(data_src,nodata)
> >  MemoryError: can't allocate memory for array
> >
> >  I run the program twice using the same input datasets when making a mosaic
> > to extract two images with the -n 0 flag.  I get one image out. However, I
> > get the above error when trying to get the second image out.  I get the 
> same
> > error when trying to do the same operation on other inputs.  The output
> > images are all the same size about 500 MB.
> >
> >  I'm running gdal_merge.py on a AMD 64-bit machine with 4 GB of RAM and 
> lots
> > of disk space.
>
>Reinaldo,
>
>I suspect that the 32bit FWTools binaries are not able
>to utiltize your RAM effectively.  I suspect a 1 or 2GB
>limit per process.  I would suggest instead that you
>use gdal_merge.py to create the mosaic file, and then
>use gdalwarp to merge in each file to the mosaic.   It
>does not attempt to load whole images into RAM.
>
>Best regards,
>
>--
>---------------------------------------+--------------------------------------
>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    | Geospatial Programmer for Rent

Reinaldo Escada Chohfi, Ph.D.
Diretor
GeoDesign Internacional

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E-mail: rec at geodesign.com.br

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