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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | [gislist] selective extraction of nodes to points |
| Date: |
04/14/2004 04:55:01 PM |
| From: |
Zane Crawford |
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I have digitized some geologic features on the surface of Europa - long
linear features, and want to analyze the cross-cutting relationships at
their intersections.
I took the shapefile and converted it to a coverage, cleaned it and
built topology (as someone on the list helpfully suggested), and used
NODEPOINT at the Arc command line to extract the nodes into a point
coverage. However this extracts *all* of the nodes - including the
endpoints of the lines, which I don't want. Is there some way to extract
only the intersections? I.e. only the nodes which lie on more than one
line?
Additionally, each of these geologic structures has a unique ID number
which I assigned it during digitization. In the point coverage
representing their intersections, I want two fields in the attribute
table representing the unique ID numbers of the two line features which
the node was at the intersection of. What's the right way to pull that
data over? There are >500 intersections, so doing it by hand isn't so
attractive.
(oh, and I'm using ArcGIS 8.3)
Thanks!
--
Zane A. Crawford zane@ideotrope.org
Amateur Human https://ideotrope.org
Boulder, Colorado __o
work : 303.492.6230 _`<,_ "Here we are, trapped in the
cell : 720.201.0751 (*)/ (*) amber of the moment. There
PGP : 0x55E0815F is no why."
-- Kurt Vonnegut
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