I am attempting to determine the downstream polyline for each reach in a stream network, so that I can route disturbances through the network (e.g. floods). I have tried determining the start and end point cats for each polyline using v.net with the report operation, but it shows each cat as zero:
1 0 0
2 0 0
3 0 0
...
2043 0 0
2044 0 0
2045 0 0
2046 0 0
Clearly this should not be the case. I have a contiguous network of polyline streams.
Any ideas here? Thanks,
C.
--
Christopher J. Fonnesbeck ( c h r i s @ f o n n e s b e c k . o r g )
Georgia Cooperative Fish & Wildlife Research Unit, University of Georgia
On Monday 08 March 2004 20:18, Christopher Fonnesbeck wrote:
I am attempting to determine the downstream polyline for each reach in
a stream network, so that I can route disturbances through the network
(e.g. floods). I have tried determining the start and end point cats
for each polyline using v.net with the report operation, but it shows
each cat as zero:
1 0 0
2 0 0
3 0 0
...
2043 0 0
2044 0 0
2045 0 0
2046 0 0
Clearly this should not be the case. I have a contiguous network of
polyline streams.
Do you have points with cats on nodes? Run
v.net input=net1 output=net2 operation=nodes
v.category input=net2 output=net3 type=point option=add field=2
v.net input=net3 operation=report afield=1 nfield=2
Radim