Difference between revisions of "Vector topology cleaning"
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'''Q:''' How about self-intersecting lines and boundaries? | '''Q:''' How about self-intersecting lines and boundaries? | ||
| − | '''A:''' In the GRASS topological model self-intersecting lines are allowed, self-intersecting boundaries are not. | + | '''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. |
| − | 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. | Note: There are some modules that do not like self-intersecting lines, e.g with {{cmd|v.buffer}} problems are expected. | ||
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| + | === See also === | ||
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| + | * [[Vector topology]] | ||
[[Category:FAQ]] | [[Category:FAQ]] | ||
[[Category:Vector]] | [[Category:Vector]] | ||
Revision as of 16:39, 6 December 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.
