[gdal-dev] warp taking time

[adiba nizami]

Sorry for the late reply. Here is the command i  gave :

gdalwarp --config GDAL_CACHEMAX 512 -s_srs "+proj=aea +lat_1=28 +lat_2=12
+lat_0=20 +lon_0=87 +x_0=2000000 +y_0=2000000 +ellps=WGS84 +datum=WGS84
+units=m +no_defs" -t_srs "+proj=aea +lat_1=28 +lat_2=12 +lat_0=20
+lon_0=87 +x_0=2000000 +y_0=2000000 +ellps=WGS84 +datum=WGS84 +units=m
+no_defs" -te -138559.10 571316.50 3010515.63 4012751.95 -tr 18 18 -wm 512
-co "BIGTIFF=YES" -srcnodata 255 -dstnodata 255  file1.tif file2.tif .....
file28.tif output.tif



On Thu, Jul 10, 2014 at 7:23 PM, Thornton, Michele M. <thorntonmm at ornl.gov>
wrote:

>  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> 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> 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
> >
>
>
>
>
>
> --
> View this message in context:
> http://osgeo-org.1560.x6.nabble.com/warp-taking-time-tp5150453.html
> Sent from the GDAL - Dev mailing list archive at Nabble.com.
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>
>
>
>
>
> --
> Best regards,
> Chaitanya kumar CH.
>
> +91-9494447584
> 17.2416N 80.1426E
>
>
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-- 
Regards,
Adiba Khan
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