[GRASS-user] how to make a grid with my DEM

GRASS GRASS user
1

Hi all,
i want to simply divide my DEM into 30m grid cells - does anyone know how to do this?

i have previously used r.clump on a 30m DEM to create unique spatial units.
however, since r.clump finds all areas of contiguous cell category values and groups them to form physically discrete areas, i end up with some spatial areas that may be larger than 30m.
any help is very much appreciated!
thank you,
Janet

2

Hi all,
i want to simply divide my DEM into 30m grid cells - does anyone know how to do this?

It’s not clear to me what result you want. What’s the resolution of your DEM? Do you need to change the resolution? or create a vector grid ?

··· 
-- 
Micha Silver
GIS Consultant, Arava Development Co.
[http://www.surfaces.co.il](http://www.surfaces.co.il)
3

Hi Janet,
Do you mean you want to create contour lines at 30m intervals? If so, r.contour would do the trick.Best,
Nick

On Sat, Feb 11, 2012 at 1:56 AM, Janet Choate <jsc.eco@gmail.com> wrote:

Hi all,
i want to simply divide my DEM into 30m grid cells - does anyone know how to do this?

i have previously used r.clump on a 30m DEM to create unique spatial units.
however, since r.clump finds all areas of contiguous cell category values and groups them to form physically discrete areas, i end up with some spatial areas that may be larger than 30m.
any help is very much appreciated!
thank you,
Janet

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