[GRASS-user] Problem with v.clean and Breaking at Intersections

[Ryan R. Rosario]

Hi,

I am having some trouble trying to break road lines from a TIGER/Line file
at intersections.

I followed advice in another thread, but I cannot get v.clean to do anything
useful. I performed the following command equivalents using the GUI:

v.patch input=roads at PERMANENT output=preint
v.clean input=roads at PERMANENT output=tempfile type=line,boundary
error=intersections tool=break

I have verified that GRASS does in fact recognize the shape file as
containing lines. If I try to display the error vector layer, nothing is
displayed (because nothing is written to the layer). How can I solve this?

Your help is greatly appreciated.

Thanks,
Ryan


--------------------------------------------------

Tool: Threshold

Break:  0.000000e+00

--------------------------------------------------

Copying vector lines...

Rebuilding parts of topology...
Building topology ...
Registering lines:    1000   2000   3000   4000  
5000   6000   7000   8000   9000 
10000  11000  12000  13000  14000 
15000  16000  17000  18000  19000 
20000  21000  22000  23000  24000 
25000  26000  27000  28000  29000 
30000  31000  32000
32493 primitives registered      
Topology was built.
Number of nodes     :   26669
Number of primitives:   32493
Number of points    :   0
Number of lines     :   32493
Number of boundaries:   0
Number of centroids :   0
Number of areas     :   -
Number of isles     :   -

--------------------------------------------------

Tool: Break lines at intersections
Intersections:     0
Intersections:     0 (line 485)
Intersections:     0 (line 984)
..... (repeats about 100 times)
Intersections:     0                         

--------------------------------------------------

Rebuilding topology for output vector map...
Building topology ...
Registering lines:    1000   2000   3000   4000  
5000   6000   7000   8000   9000 
10000  11000  12000  13000  14000 
15000  16000  17000  18000  19000 
20000  21000  22000  23000  24000 
25000  26000  27000  28000  29000 
30000  31000  32000
32493 primitives registered      
Building areas: 


0 areas built      
0 isles built
Attaching islands: 
Attaching centroids: 

Topology was built.
Number of nodes     :   26669
Number of primitives:   32493
Number of points    :   0
Number of lines     :   32493
Number of boundaries:   0
Number of centroids :   0
Number of areas     :   0
Number of isles     :   0

--------------------------------------------------

Building topology for error vector map...
Building topology ...
Registering lines: 
0 primitives registered      
Building areas: 
0 areas built      
0 isles built
Attaching islands: 
Attaching centroids: Topology was built.
Number of nodes     :   0
Number of primitives:   0
Number of points    :   0
Number of lines     :   0
Number of boundaries:   0
Number of centroids :   0
Number of areas     :   0
Number of isles     :   0
-- 
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