[GRASSLIST:3818] Re: Mask Concept

[Otto Dassau]

Anil Kumar Bhagat wrote:
> 
> Dear Grass user ,
>                   I donot have the concept of mask . Please anybody help
> me in understanding mask . What is this ? How is works . How to set or
> prepare new mask ? How is modules are directly related to mask or mask
> file . Sorry for this simple qustion ?
> 

normally, the manual page of the modul r.mask should provide a
sufficient answer to your questions: 

http://grass.itc.it/gdp/html_grass5/html/r.mask.html

if this doesn't help, it would be useful to describe your 
usage problem more detailed to get an useful answer.

 Otto Dassau