[GRASS-dev] v.split: what is 'vertices' for?
hamish_nospam at yahoo.com
Thu Oct 5 02:53:54 EDT 2006
Maciej Sieczka wrote:
> I haven't found anything relevant in the manual, lists archives, the
> BT or the source code, so I'm asking here.
> There are 2 vertices (nodes) currently. Trying to add a vertex between
> $ v.split input=line output=line_split vertices=3
> Checking line_split in v.digit proves there are still only 2 vertices
> - the nodes themselves; the 3rd vertex in not added.
> No matter what is the 'vertices' set to, the outcome is the same. Is
> that OK? What am I missing to understand what is the 'vertices' option
v.split is acting correctly. As usual, more documentation needed.
The module breaks lines at verticies, it doesn't add verticies.
In Radim's vector TODO there is a bit about v.in.ogr needing v.split
built into it for huge polygons.
e.g., I have a long, high-resolution single boundary line of the
coastline. Some tools take a very long time to process (build) this. By
using v.split to break the same polygon into several connected boundary
lines (green "X" in v.digit) you can speed up processing 1000%.
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