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

[Nick Ves]

While we discuss it, another good step you want to apply before doing
the actuall stitch is to trim the rasters' area by a couple of pixels
before hand. Usually the borders is full with pesky pixel with
distorsions/noise, which might contaminate your mosaic.

N

On Fri, Nov 15, 2013 at 10:28 PM, Markus Neteler <neteler at osgeo.org> wrote:
> 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
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