<div dir="ltr">Adiba,<div><br></div><div>I noticed that your source and target projections are same. Why not use gdalbuildvrt and gdal_translate and skip the warping process? You create a virtual mosaic (and assign the projection if needed) with buildvrt. You can create a tiff file from the vrt file using gdal_translate.</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Jul 14, 2014 at 11:12 AM, adiba nizami <span dir="ltr"><<a href="mailto:adiba.nizami@gmail.com" target="_blank">adiba.nizami@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Sorry for the late reply. Here is the command i gave :</div><div><br></div><div>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</div>
<div><br></div></div><div class="gmail_extra"><div><div class="h5"><br><br><div class="gmail_quote">On Thu, Jul 10, 2014 at 7:23 PM, Thornton, Michele M. <span dir="ltr"><<a href="mailto:thorntonmm@ornl.gov" target="_blank">thorntonmm@ornl.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hello,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Michele Thornton<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:gdal-dev-bounces@lists.osgeo.org" target="_blank">gdal-dev-bounces@lists.osgeo.org</a> [mailto:<a href="mailto:gdal-dev-bounces@lists.osgeo.org" target="_blank">gdal-dev-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>bas smit<br>
<b>Sent:</b> Thursday, July 10, 2014 7:52 AM<br>
<b>To:</b> Chaitanya kumar CH<br>
<b>Cc:</b> gdal dev<br>
<b>Subject:</b> Re: [gdal-dev] warp taking time<u></u><u></u></span></p><div><div>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">I am wondering why you are using <span style="font-family:"Arial","sans-serif"">gdalwarp for mosaicing images having </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#500050">same projection instead of gdal_merge.py?</span><u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#500050">Bas Smit</span><u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Jul 10, 2014 at 7:14 PM, Chaitanya kumar CH <<a href="mailto:chaitanya.ch@gmail.com" target="_blank">chaitanya.ch@gmail.com</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal">garfy,<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Please provide the gdalwarp command you used. Did you modify GDAL_CACHEMAX?<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Jul 10, 2014 at 3:26 PM, garfy <<a href="mailto:adiba.nizami@gmail.com" target="_blank">adiba.nizami@gmail.com</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Dear All,<br>
<br>
I am trying to generate mosaic of 28 input images using *gdalwarp*.<br>
All are in same projection. It has taken 5 days to generate the final<br>
output.<br>
Please find the gdalinfo of input and output attached. The input files are<br>
passed to warp in the order in which the gdalinfo is present in the<br>
attachement.<br>
<br>
Any input on improving the time would be really helpful.<br>
<br>
<br>
Thanks<br>
input_files_gdalinfo.txt<br>
<<a href="http://osgeo-org.1560.x6.nabble.com/file/n5150453/input_files_gdalinfo.txt" target="_blank">http://osgeo-org.1560.x6.nabble.com/file/n5150453/input_files_gdalinfo.txt</a>><br>
final_output_gdalinfo.txt<br>
<<a href="http://osgeo-org.1560.x6.nabble.com/file/n5150453/final_output_gdalinfo.txt" target="_blank">http://osgeo-org.1560.x6.nabble.com/file/n5150453/final_output_gdalinfo.txt</a>><br>
<br>
<br>
<br>
<br>
<br>
--<br>
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<p class="MsoNormal"><br>
<br clear="all">
<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span><span style="color:#888888">-- </span></span><span style="color:#888888"><br>
<span>Best regards,</span><br>
<span>Chaitanya kumar CH.</span><br>
<br>
<span><a href="tel:%2B91-9494447584" target="_blank">+91-9494447584</a></span><br>
<span>17.2416N 80.1426E </span></span><u></u><u></u></p>
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<br>_______________________________________________<br>
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<a href="http://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank">http://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br></blockquote></div><br><br clear="all"><div><br></div>-- <br></div></div>Regards,<br>Adiba Khan<br>
</div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br>Best regards,<br>Chaitanya kumar CH.<br><br>+91-9494447584<br>17.2416N 80.1426E
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