How to join 2 vector files with common boundary but retain categories ?

[Malcolm Williamson]

The easiest way in GRASS would be to convert the two files to raster format;
this is really the domain in which GRASS is designed to work.

> 
> Hi Everyone:
> 
> Here's what we are attempting:
>   -----         -----		  -----------
>  |  9  |   +   | 10  |    =    | 9  |  10  |
>  |_____|       |_____|         |____|______|
> 
> boundary1       boundary2         boundary12
> 
> boundary1    is a vector file with an area with category as 9
> boundary2    is a vector file with an area with category as 10
> 
> How can they be joined to form vector file boundary12 with the area
> category information intact ??
> 
> Thank you,
> --
> Laxmi P. Musunur (LP) School of Forestry, Auburn University, 
> AUBURN AL 36849	E-mail:  mlp at forestry.auburn.edu
> 
> 
> p.s.
> 
> 1. Please note that the two areas have a common boundary so v.patch would 
>    identify the resulting area with only one category! Hence v.patch can't
>    be used.
> 
> 2. Even in v.digit one can't label the two areas in boundary12 seperately
>    because it identifies only one outer 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