Vector topology cleaning: Difference between revisions
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(screenshot example added) |
(+notes from Markus Metz) |
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Tools to consider: | Tools to consider: | ||
* TBD | |||
* ... | |||
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'''Q:''' How about self-intersecting lines and boundaries? | |||
'''A:''' In the GRASS topological model self-intersecting lines are allowed, self-intersecting boundaries are not. | |||
Self-intersecting lines are ok e.g. for {{cmd|v.net}} modules, e.g. to represent a bridge of a secondary road over a highway. | |||
Note: There are some modules that do not like self-intersecting lines, e.g with {{cmd|v.buffer}} problems are expected. | |||
Revision as of 20:56, 23 November 2011
Q: How can I patch to fitting area maps with have been digitized separately and correct the topology? I observe that the shared polygon boundaries do not perfectly match...
A: You can use v.clean for this.
Tools to consider:
- TBD
- ...
Q: How about self-intersecting lines and boundaries?
A: In the GRASS topological model self-intersecting lines are allowed, self-intersecting boundaries are not. Self-intersecting lines are ok e.g. for v.net modules, e.g. to represent a bridge of a secondary road over a highway.
Note: There are some modules that do not like self-intersecting lines, e.g with v.buffer problems are expected.