AW: [GRASS-user] Some issues with r.mapcalc

[Christian Schwartze]

You can change the NULL value using r.null map null=x to avoid the null()
handling. Is it your question..??

Christian.

-----Ursprüngliche Nachricht-----
Von: grass-user-bounces at lists.osgeo.org
[mailto:grass-user-bounces at lists.osgeo.org] Im Auftrag von Fulvio
Mastrogiovanni
Gesendet: Mittwoch, 1. April 2009 13:45
An: grass-user at lists.osgeo.org
Betreff: [GRASS-user] Some issues with r.mapcalc

Hi everyone,

I hope you can help me in solving this issue. Basically, what I want to do
is to
create a new raster map whose cells are simply given by the "or" of other
two
maps (possibly for specific categories), as follows:

r.mapcalc test=if(vegcover==1 || railroads==1)

However, maps like railroads are null() when not equal to 1. The resulting
map
"test" is null() wherever cells in railroads are null(), therefore making
null() also cells where vegcover is 1.

How can I solve this issue?

Thanks!

Fulvio


-- 
Fulvio Mastrogiovanni
DIST|University of Genova|Italy

Email: fulvio.mastrogiovanni at unige.it
WWW: http://www.laboratorium.dist.unige.it/~fulvio/
Phone: (+39)0103532801

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