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

[Moritz Lennert]

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.

See

https://grass.osgeo.org/grass74/manuals/rasterintro.html
https://grasswiki.osgeo.org/wiki/Computational_region

for general info and

https://grass.osgeo.org/grass74/manuals/g.region.html

for the module allowing to define the region.

Moritz