[GRASSLIST:8484] Re: converting raster value of 0 (black) to null

[bfdi533]

On Mon, 2005-10-03 at 15:33 -0700, Ian MacMillan wrote:
> Ed, you can try this.  First, I think you need to put quotes around 
> your if statement.  The command line is probably choking on the 
> parentheses.  So instead of
> 
> > radarnew=if(radar=0,null(),radar)
> try
> r.mapcalc radarnew = 'if(radar=0, null(),radar)'
> 
> Or you could just use r.null (designed specifically for your purpose).

That did the trick exactly.  I had no idea this one existed and it
worked perfectly.

Per another post, I also determined that the radar=0 should have been
radar==0 which is why I got the all pink result.

Thanks to all for the pointers.

-- 

--------------------------
Ed Davison