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| Subject: | [gislist] Finding Islands on Lakes / topology (?) question |
| Date: |
06/15/2004 06:05:01 PM |
| From: |
Brian Russo |
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I have a topologically clean layer with chained polylines, but no useful
attribute information. I can convert this into polygons, but the methods
I've used give me polygons for interior waterways (lakes, etc) as well
as islands on those lakes. So I have these sort of nested donuts/donut
holes. What I would like is to be able to assign some sort of code based
on how 'deep' the nesting is.
For example,
0 = Not in a region
1 = Encapsulated by one polygon (e.g. an island in the ocean)
2 = Encapsulated by two polygons (e.g. a lake on said island)
3 = Encapsulated by three polygons (e.g. an island on the lake on the island)
...
n
I have no idea what n is, but I doubt it's higher than 3-4.
ideas?
thanks
--
Recursivity. Call back if it happens again.
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