## DESCRIPTION

v.overlay allows the user to overlay to vector area maps. There are 3 links attached to features in output map,

- field 1: link to the new table, new table has 3 columns
  - cat - key column linking rows to features
  - cata - category of afield from ainput
  - catb - category of bfield from binput
- field 2: category of afield from ainput
- field 3: category of bfield from binput

## NOTES

Currently only areas are supported! See also v.select.

Attributes of the tables from ainput and binput are joined into a new table linked to the output map.

v.db.connect map=outputmap table=ainput.dbf field=2
v.db.connect map=outputmap table=binput.dbf field=3

Attention: Removing the output map will also delete all tables linked to it! Therefore it is advisable to copy tables from ainput and binput first and connect the copied tables to the output map.

## EXAMPLE

v.overlay ainput=lake binput=province output=lakeXprovince

## SEE ALSO

v.db.connect, v.select, g.copy

## AUTHORS

Radim Blazek, ITC-Irst, Trento, Italy

Last changed: $Date: 2004/12/10 09:54:32 $