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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] how to get neighbours list from a shapefile |
| Date: |
07/21/2005 08:00:02 AM |
| From: |
Quantitative Decisions |
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At 11:40 AM 7/21/2005 +0200, lars lingner wrote:
>I`m looking for an solution to get an list of all neighbours from an
>feature in my shapefile. It should differentiate between included and
>surrounding neighbours. At top of this it would be really nice to get
>the length of the border between the current feature and the neighbours.
>
>The output should be an table, which I need for further processing.
>
>I thought this is an basic task for an GIS (even if its not an trivial
>one), but I couldn't find anything. Is there an solution out there?
>Maybe as an extension for ESRI ArcView/GIS or GRASS or any other GIS?
This was recently discussed on the ArcView 3.x ESRI user forum, with an
extension available at
http://forums.esri.com/Thread.asp?c=3&f=38&t=163318&mc=3#479013 . Also
attached to that posting is a brief downloadable report providing an
efficient, general approach for solving this kind of problem (in any vector
GIS) even when there are topological inconsistencies and digitizing
errors. This may be of interest to all GISList readers, not just users of
AV 3.x.
The extension produces a table of the neighbor relation and it reports the
length of the shared borders. It does not distinguish between included and
surrounding neighbors: that's really a separate analysis, which of course
will be facilitated by having a table of the neighbors.
As always, the ArcView-centric mailing lists and Web pages are the best
places to start with inquiries like this.
--Bill Huber
Quantitative Decisions
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