[gdal-dev] warp taking time

[Thornton, Michele M.]

Hello,

I’m interested in this thread.  One comment I can add about gdal_merge.py is that it does not properly handle nodata values from the full (padded) extent of the input files.  gdalwarp, which can be VERY slow, does handle the nodata values correctly.

Michele Thornton

From: gdal-dev-bounces at lists.osgeo.org [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of bas smit
Sent: Thursday, July 10, 2014 7:52 AM
To: Chaitanya kumar CH
Cc: gdal dev
Subject: Re: [gdal-dev] warp taking time

I am wondering why you are using gdalwarp for mosaicing images having same projection instead of gdal_merge.py?

Bas Smit

On Thu, Jul 10, 2014 at 7:14 PM, Chaitanya kumar CH <chaitanya.ch at gmail.com<mailto:chaitanya.ch at gmail.com>> wrote:
garfy,

Please provide the gdalwarp command you used. Did you modify GDAL_CACHEMAX?

On Thu, Jul 10, 2014 at 3:26 PM, garfy <adiba.nizami at gmail.com<mailto:adiba.nizami at gmail.com>> wrote:
Dear All,

I am trying to generate mosaic of 28 input images using *gdalwarp*.
All are in same projection. It has taken 5 days to generate the final
output.
Please find the gdalinfo of input and output attached. The input files are
passed to warp in the order in which the gdalinfo is present in the
attachement.

Any input on improving the time would be really helpful.


Thanks
input_files_gdalinfo.txt
<http://osgeo-org.1560.x6.nabble.com/file/n5150453/input_files_gdalinfo.txt>
final_output_gdalinfo.txt
<http://osgeo-org.1560.x6.nabble.com/file/n5150453/final_output_gdalinfo.txt>





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Best regards,
Chaitanya kumar CH.

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