[GRASS-user] i.image.mosaic generates blank mosaic

[Markus Neteler]

On Fri, Nov 15, 2013 at 4:12 PM, Nikos Alexandris
<nik at nikosalexandris.net> wrote:
> nyflyer wrote:
>> I've been trying to use the i.image.mosaic command in GRASS 6.4.1 in
>> Ubuntu

Please note that 6.4.1 isn't particularly new.

http://trac.osgeo.org/grass/wiki/Release/6.4.2-News
"Between 6.4.1 and the current 6.4.2 more than 770 updates have been applied."

http://trac.osgeo.org/grass/wiki/Release/6.4.3-News
"Over 830 new features and bug-fixes have been applied since 6.4.2. "

(and it is time to get 6.4.4 out...)

>> to stitch two raster image files (technically I'm trying to stitch only
>> the blue channel of an RGB truecolor image) but I'm just getting a blank image
>> file as the output.

You have the computational region right?
...
> --%<---
>> | Total Cells: 28707984
>> | Projection: UTM (zone 17)
>> | N: 3280373.34673833 S: 3280265.18938071 Res: 0.02067228
>> | E: 372335.90758975 W: 372236.78889019 Res: 0.01806428

A remark: The current resolution is hence 1-2cm given that you are in UTM?

BTW: You may consider to check if you do not want to have square
pixels (and if so, why they aren't).

Markus