No, what I meant was post a test case written in Java which calls the
JTS LineMerger class with an input which produces the unexpected behaviour.
If this is embedded in some WPS server there's not much I can do to
debug it. I can say one thing - it seems *very* unlikely that the new
lines which appear in the final image are created by the LineMerger
algorithm. I have no idea where they might come from.
Theodor Foerster wrote:
I uploaded 2 pictures of the original
(http://geoserver.itc.nl:8080/wps/original.png) and the resulting merged
lines (http://geoserver.itc.nl:8080/wps/mergedLines.png).
I am not sure, what you mean by testcase. I could post a WPS request and
the URL to the process and you could play around with it. Is it that,
what you mean?
Thanks for your efforts.
Theodor
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf
Of Martin Davis
Sent: Thursday, September 25, 2008 6:41 PM
To: JTS Topology Suite Development
Subject: Re: [jts-devel] LineMerger question/problem
That doesn't seem right. If a node truly has degree 1,
LineMerger should not snap that node to any other node.
LineMerger does not move nodes, it simply joins them if they
are coincident.
A picture might help to shed some light on the problem - as
would a simple test case.
Theodor Foerster wrote:
Hi,
I am using LineMerger, to remove pseudo nodes from a
waterpipe network.
My intention is to remove any nodes (degree = 2) and merge the two
affected linestrings. I thought that LineMerger would be the right
tool to use, but somewhat the LineMerger also closes lines, thus
nodes, which have a degree of 1 are now connected to other
nodes with degree of 1.
Thereby the cul-de-sacs are removed completely. So is this
behaviour
intended, when adding a complete network to the LineMerger, that it
also connects the cul-de-sacs of the network?
Help is highly appreciated.
Best regards
Theodor
ITC, Enschede
Department of Geo Information Processing PO. Box 6 7500 AA
Enschede
the Netherlands International Institute for Geo-Information Science
and Earth Observation (ITC) Chamber of Commerce: 410 27 560
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