Hi,
Although v.clean often prints "Removed dangles: 177", nothing
actually changes in the output compred to input. What does that message
actually mean?
in spearfish:
$ v.clean in=roads out=roads_nodang tool=rmdangle
| Remove dangles | Building topology ...
825 primitives registered
Topology was built.
Number of nodes : 676
Number of primitives: 825
Number of points : 0
Number of lines : 825
Number of boundaries: 0
Number of centroids : 0
Number of areas : -
Number of isles : -
Removed dangles: 177 removed lines: 0
Building topology ...
825 primitives registered
0 areas built
0 isles built
Attaching islands:
Attaching centroids: Topology was built.
Number of nodes : 676
Number of primitives: 825
Number of points : 0
Number of lines : 825
Number of boundaries: 0
Number of centroids : 0
Number of areas : 0
Number of isles : 0
Now run the same command on the previous output - the same information
about 177 removed dangles pops up. Why?
$ v.clean in=roads_nodang out=roads_nodang2 tool=rmdangle
| Remove dangles | Building topology ...
825 primitives registered
Topology was built.
Number of nodes : 676
Number of primitives: 825
Number of points : 0
Number of lines : 825
Number of boundaries: 0
Number of centroids : 0
Number of areas : -
Number of isles : -
Removed dangles: 177 removed lines: 0
Building topology ...
825 primitives registered
0 areas built
0 isles built
Attaching islands:
Attaching centroids: Topology was built.
Number of nodes : 676
Number of primitives: 825
Number of points : 0
Number of lines : 825
Number of boundaries: 0
Number of centroids : 0
Number of areas : 0
Number of isles : 0
There is no difference between roads_nodang and roads_nodang2:
$ v.build roads_nodang option=dump > roads_nodang.dump
$ v.build roads_nodang2 option=dump > roads_nodang2.dump
$ diff roads_nodang2.dump roads_nodang.dump
(nothing printed)
so the data was not modified, despite "Removed dangles: 177". Or was it?
Maciek
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