[GRASS-user] How to use r.grow module

Moritz Lennert mlennert at club.worldonline.be
Fri Oct 12 02:52:43 PDT 2018

Hi Vidura,

On 11/10/18 19:15, Vidura Dantanarayana wrote:
> Hi everyone,
> I'm a new user to grass and can I know how to create a raster map 
> containing one cell using r.grow module. I read the manual but could not 
> understand any.

r.grow is not meant for creating a map with one cell. It creates a sort 
of buffer around non-null cells in an existing raster map.

To create a new raster map with one cell, you have different options 
depending on what you have:

- If you have coordinates for the cell, you can use

	- r.in.xyz
	- v.in.ascii to create a vector point and then v.to.rast to transform 
this to raster.

- If you want to digitize the cell interactively, you can use the raster 
digitizer (https://grass.osgeo.org/grass74/manuals/wxGUI.rdigit.html)

Whatever you do, make sure you first have a good understanding of the 
concept of computational region in GRASS GIS as this will determine the 
nature of your raster.



for general info and


for the module allowing to define the region.


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