Addition of two maps

[Malcolm Williamson]

> 
> Here is the situation:
> 
> 	I have two maps that have an overlapping area.  I would like to 
> add the two maps together and use only one map for the overlapping
> 
> area.  If I use r.mapcalc and preform an addition function it
> 
> will add that overlapping area.  
> 
> How can I avoid this situation?
> 
> Thanks for any help.
> 
> 
> Kym M. Lenkus
> Davidson Laboratory
> 

If I understand you correctly, the following should work:

	newmap = if(map_a,map_a,map_b)

assuming that map_a is the one you want to use in the overlapping area.

-- 
Malcolm D. Williamson - Research Assistant       E-mail: malcolm at cast.uark.edu
Center for Advanced Spatial Technologies      Telephone: (501) 575-6159
Ozark Rm. 12                                        Fax: (501) 575-3846 
University of Arkansas              
Fayetteville, AR 72701