[GRASS-user] Difference between r.series; r.patch

[katrin eggert]

Hello Nikos

Very good point... As far as I can see, the order is relevant in
"overlapping pixels".
About the i.image.mosaic, it was developed by Markus. I gave a look at the
Script (Python version) and I'm not sure what is the advantage of this
script against r.patch.

Thanks
Kat

2010/10/14 Nikos Alexandris <nikos.alexandris at felis.uni-freiburg.de>

> katrin wrote:
>
> > > I have a sequence of satellite images (e.g 1 in the north, other in the
> > > center and other in south) that I want to merge in a single image. I
> > > found three GRASS methodologies:
> > > - r.series
> > > - r.patch
> > > - i.image.mosaic.
> > > Which one is the best to perform what I need?
>
> Hamish:
>
> > I'm not really familiar with i.image.mosaic, but r.patch would be the
> > one to use if you have three satellite images taken in sequence which
> > you wish to merge into a single image.
>
> > r.series is usually used to merge overlapping maps, r.patch to merge
> > adjoining maps.
>
> > to make r.patch easier, you can do:
> >  g.region rast=map1,map2,map3
>
> > to extend the region settings to the outer bounds of all three maps.
>
> Something critical, if I am not wrong: the order of "map1,map2,map3" is
> important (when patching overlaping maps). Check the r.patch manual.
>
> Nikos
>
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