[GRASS-user] custom local map location

[Nikos Alexandris]

* Ken Mankoff <mankoff at gmail.com> [2018-05-19 11:35:23 +0200]:

>Hi GRASS List,
>
>I've just spent 30 days on a field campaign collecting data. I have a
>large amount of it in a GRASS mapset with location EPSG:3413. I'd like
>to set up a new location with (0,0) centered on our basecamp and
>everything nearby relative to that. Can someone advise how to use
>"proj" to create a new location centered on either a (lon,lat) location
>but with units meter, or centered on an (x,y) location from a different
>projection?
>
>The reason for this is so I can push data to ParaView which doesn't
>work well with coordinate systems far removed from the origin.

Ken,

some starter idea (?)

# create an unprojected XY location
grass -c /grassdb/xy

# import an 256 by 256 sized (unprojected) TIFF
r.external input=SomeTIFF out=SomeTIFF

# re-set SomeTIFF's region
r.region n=128 s=-128 w=-128 e=128

Now (0,0) is in the center of the image.

Nikos

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