[Mapserver-users] OT: Extracting dead ends from a polyline theme

[Kieran J. Ames]

DAvid,
I gave that some (thorough?) thought. However, when I use EDTOOLS for all
points, it extracts ALL VERTICES as points. So, along with dead ends, I get
every vertex in the shapefile. Matching that back to the road theme would
put me back where I started, but without the start/end nodes.
I'm toying with the shp2gen script now. I think I can write a script to
parse a GEN file and get the first and last coord of each polyline. However,
when I did it manually, I ran upon some errors. ...perhaps I missed some
data points during the monotony.
Kieran

"Lowther, David W" wrote:

> Kieran,
>
> So, you have 2 point shapefiles. 1 has intersections, 2 has all points.
> Select the features from 2 that overlap 1. Switch the selection. Create
> shapefile 3 that has all points that are not intersections. Select roads
> that overlap shapefile 3. These should be your roads that are deadends.
>
> Good Luck!
>
> Dave
>
> -----Original Message-----
> From: Kieran J. Ames [mailto:kames at keyspanenergy.com]
> Sent: Wednesday, January 22, 2003 10:25 AM
> To: mapserver-users
> Subject: [Mapserver-users] OT: Extracting dead ends from a polyline
> theme
>
> List,
> Sorry for the off-topic, but I've looked everywhere trying not to bother
> the group.
>
> I've discovered Fred Pierssen's EDTOOLS script and have used it to
> extract intersections from a road theme. However, lines that terminate
> (Dead Ends) are not extracted. Any thoughts on how I might capture them?
>
> I tried extracting ALL points from the polyline theme, but that gives me
> an unwieldy point theme which contains ALL VERTICES as well, which is
> not where I'm aiming.
>
> Suggestions on how to extract deadends appreciated.
>
> AV3.1
> WINNT
> GIS Spatially-Challenged
>
> Thanks,
> Kieran Ames
>
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