DESCRIPTION
v.net.iso splits net to bands between cost isolines (direction from
centre). Centre node must be opened (costs >= 0). Costs of centre node are
used in calculation. Supported are cost assignments for both arcs and nodes,
and also different in both directions of a vector line. For areas cost will
be calculated along boundary lines.
NOTES
Nodes must be on the isolines.
Center nodes have to be assigned to vector nodes. Nodes and arcs can be closed
using cost = -1.
EXAMPLE
Subdivision of a network into areas:
The map must contain at least one center
(point) on the vector network which can be patched into with
v.patch.
v.net.iso input=streets output=isomap ccats=1 costs=1000,2000,5000
that should cut network to 4 categories:
cat | distance from point
1 0 - 1000
2 1000 - 2000
3 2000 - 5000
4 > 5000
To see the result, run for example:
d.vect isomap col=green cats=1
d.vect isomap col=yellow cats=2
d.vect isomap col=orange cats=3
d.vect isomap col=red cats=4
SEE ALSO
d.path,
v.net.alloc,
v.net.salesman,
v.net.steiner,
v.patch
AUTHOR
Radim Blazek, ITC-Irst, Trento, Italy
Last changed: $Date$