[GRASS-user] One raster from many

[Daniel Farnan at San Francisco]

Worked much faster than 4 days, but generated a blank (white) raster.
 - this may be due to the srtm data(?). All were imported as .tif with
r.in.gdal.
I know I had done this another way initialy, as I said, similar to
resetting the region when subsetting a raster map, I just cannot recall
what I did. 
(sorry Maciek, I sent too quickly - meant to include the list).
-----Original Message-----
From: Maciej Sieczka [mailto:tutey at o2.pl]
Sent: Monday, July 16, 2007 11:33 AM
To: Daniel Farnan @ San Francisco
Cc: GRASSLIST
Subject: Re: [GRASS-user] One raster from many

Daniel Farnan @ San Francisco wrote:
> Tried r.patch and r.cross - did not use these previously, r.patch took

> over 4 days to process the rasters, and still crashed my machine.

It's better to reply via the mailing list, so more folks can
participate.

r.patch should not fail to process as little as 11 SRTM tiles within 4
days, either 1" or 3". Propably you have your working region/resolution
set to big and running out of memory?

try:

g.region rast=rast1,rast2,...,rast11 -a
r.patch in=rast1,rast2,...,rast11 out=rast_all

Does that still crash? What GRASS version and platform?

> I am not really concerned about the null values,

No worries. r.patch will treat null transparent.

> the area
> is large, and the files had to be downloaded piecemeal from USGS, I 
> just want to put them together as one file. :-) thanks for the 
> response - I was hoping it was r.patch when I did the GUI exploration 
> last week, however it seems not.

Besides r.patch (and multipurpose r.mapcalc) there is not other tool in
GRASS usefull for "quilting" rasters I guess.

Maciek