[GRASSLIST:2056] Re: editing raster polygon

[Richard Greenwood]

Helmer,

Thank you very much. You put me on the right path. I made two minor changes 
(below) to your approach and got the result that I desired.

     r.mapcalc
     correctedpolygon=if(not(isnull(areastoremove)), null(), 
uncorrectedpolygon)

I appreciate your help.
Thanks,
Richard

At 08:14 AM 12/15/2003, Helmer Schack-Kirchner wrote:
>Convert the digitized polygon areas to raster and use r.mapcalc.
>correctedpolygon= if(areastoremove,NULL(),uncorrectedpolygon)
>
>(Please refer the r.mapcalc manual for the syntax)
>
>Helmer
>
>Richard Greenwood wrote:
>
>>I have a complex raster polygon that I use as a mask. I need to edit the 
>>polygon. Specifically, I need to remove some areas of the polygon.
>>
>>I have used r.digit to digitize the areas that I would like to remove, 
>>but I can not seem to see what to do next.
>>
>>Thanks.
>>
>>
>>Richard W. Greenwood, PLS
>>Greenwood Mapping, Inc.
>>Rich <at> GreenwoodMap <dot> com
>>(307) 733-0203
>>http://www.GreenwoodMap.com
>
>
>--
>Dr.Helmer Schack-Kirchner
>Institut für Bodenkunde und Waldernährungslehre
>Albert-Ludwigs-Universität
>79085 Freiburg / Germany
>Tel. xx761 203 3612
>Fax. xx761 203 3618
>


Richard W. Greenwood, PLS
Greenwood Mapping, Inc.
Rich <at> GreenwoodMap <dot> com
(307) 733-0203
http://www.GreenwoodMap.com