[GRASS-user] Patch tiles faster

Hi,
I need to patch more non overlapping raster maps into one map.
Currently I am using r.patch, but it is very slow for larger maps
(about 40 minutes in my case). It is so slow probably because it is
reading and processing all input tile maps with extent of the output
map. Is there a faster way how to combine more non overlapping maps?

Radim

Hi,
don't know about speed but maybe take a look at "gdal_merge.py",
it may works out...

Maxi

On 10/04/2011 07:27 PM, Radim Blazek wrote:

Hi,
I need to patch more non overlapping raster maps into one map.
Currently I am using r.patch, but it is very slow for larger maps
(about 40 minutes in my case). It is so slow probably because it is
reading and processing all input tile maps with extent of the output
map. Is there a faster way how to combine more non overlapping maps?

Radim
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--

Dr. Eng. Massimiliano Cannata
Responsabile Area Geomatica
Istituto Scienze della Terra
Scuola Universitaria Professionale della Svizzera Italiana
Via Trevano, c.p. 72
CH-6952 Canobbio-Lugano
Tel: +41 (0)58 666 62 14
Fax +41 (0)58 666 62 09

What about creating a gdal vrt, then if you need one file you can
convert it to another format.

Alex

On 10/05/2011 12:06 AM, Massimiliano Cannata wrote:

Hi,
don't know about speed but maybe take a look at "gdal_merge.py",
it may works out...

Maxi

On 10/04/2011 07:27 PM, Radim Blazek wrote:

Hi,
I need to patch more non overlapping raster maps into one map.
Currently I am using r.patch, but it is very slow for larger maps
(about 40 minutes in my case). It is so slow probably because it is
reading and processing all input tile maps with extent of the output
map. Is there a faster way how to combine more non overlapping maps?

Radim
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