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

GRASS GRASS user
1

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@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@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