Hi,
here is a vector topology related issue:
After merging a base layer of adjacent polygons ("all the counties of an
island") into one polygon ("the island's polygon") I am riddled by two issues:
1) How to get "just the outline" of the island ? Both v.type and v.extract with
"type=boundary,line" produce an empty vector.
2) The main issue is to derive all counties of the island which lie on the
shore (= ignore the counties which don't have a beach). How can a topological
query be set up, saying "derive all the county polygons which share a common
boundary with the islands shoreline" ?
Peter
--
Dr. Peter Löwe
<[EMAIL PROTECTED]>
Psssst! Schon vom neuen GMX MultiMessenger gehört?
Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger
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