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edited Dec 25, 2012 at 19:46

zetah

I wanted to merge around 20 dem tiffs each around 100MB, and I used gdalwarp (I know about virtual file option):

gdalwarp $(list_of_tiffs) merged.tiff

However this command took very long time, and after some 15min it was processing 5th image from set. I terminate it.

I then found that gdal_merge.py script can be used also for mosaicing, and tried it:

grad_mergegdal_merge.py $(list_of_tiffs)

which completed in less then 3min.

As I expected that both commands would produce same result, I wonder what's the difference between the two, as to why gdalwarp takes so much time if result is same?

I wanted to merge around 20 dem tiffs each around 100MB, and I used gdalwarp (I know about virtual file option):

gdalwarp $(list_of_tiffs) merged.tiff

However this command took very long time, and after some 15min it was processing 5th image from set. I terminate it.

I then found that gdal_merge.py script can be used also for mosaicing, and tried it:

grad_merge.py $(list_of_tiffs)

which completed in less then 3min.

As I expected that both commands would produce same result, I wonder what's the difference between the two, as to why gdalwarp takes so much time if result is same?

I wanted to merge around 20 dem tiffs each around 100MB, and I used gdalwarp (I know about virtual file option):

gdalwarp $(list_of_tiffs) merged.tiff

However this command took very long time, and after some 15min it was processing 5th image from set. I terminate it.

I then found that gdal_merge.py script can be used also for mosaicing, and tried it:

gdal_merge.py $(list_of_tiffs)

which completed in less then 3min.

As I expected that both commands would produce same result, I wonder what's the difference between the two, as to why gdalwarp takes so much time if result is same?

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asked Dec 25, 2012 at 19:32

zetah

What's the difference between gdalwarp and gdal_merge for mosaicing

I wanted to merge around 20 dem tiffs each around 100MB, and I used gdalwarp (I know about virtual file option):

gdalwarp $(list_of_tiffs) merged.tiff

However this command took very long time, and after some 15min it was processing 5th image from set. I terminate it.

I then found that gdal_merge.py script can be used also for mosaicing, and tried it:

grad_merge.py $(list_of_tiffs)

which completed in less then 3min.

As I expected that both commands would produce same result, I wonder what's the difference between the two, as to why gdalwarp takes so much time if result is same?