[GRASS-user] Create a raster starting from a coordinate pair

[Johannes Radinger]

What do you mean exactly with creating a raster from a coordinate pair?

If you want to align a raster to your coordinates you might have a look
into g.region
and set appropriate resolution and extend coordinates.

To create a raster based on coordinates, eg. set a raster value at a
specific coordinate
pair to a specific value you could use r.mapcalc:

E.g. Set the value 1 at the cell x=52, y=10
r.mapcalc "newmap = if(abs(x()-52.0)<0.001 && abs(y()-10.00)<0.001, 1)"

If you know the specific row and column and resolution you could also use:
r.mapcalc "newmap = if(row()-1 == int(($n-10.0)/$nsres) && col()-1 ==
int((52.0-$w)/$ewres), 1)"

Thanks to Glynn who taught me these things some time ago on the mailing
list :)

/Johannes




On Tue, Dec 10, 2013 at 1:02 PM, aborruso <aborruso at gmail.com> wrote:

> Hi all,
> is there some grass raster command to create a raster starting from a
> coordinate pair?
>
> Something like r.createraster input=x,y output=myraster
>
> Thank you,
>
> Andrea
>
>
>
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