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On 11/17/10 12:10, strk wrote:
<blockquote cite="mid:20101117111019.GB92020@keybit.net" type="cite">
<pre wrap="">On Wed, Nov 17, 2010 at 11:40:41AM +0100, Jan Hartmann wrote:
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<pre wrap="">Perhaps this is the wrong list to ask, but I just read Martin Davis' column:
<a class="moz-txt-link-freetext" href="http://lin-ear-th-inking.blogspot.com/2010/08/magnifying-topology-using-jts.html">http://lin-ear-th-inking.blogspot.com/2010/08/magnifying-topology-using-jts.html</a>
It's a tool for the Java Topology Suite (JTS) to discover small
topological errors in a vector map. It solves a problem that I have
suffered from during my whole GIS career: getting correct input maps.
How difficult would it be to implement this in GEOS, and, possibly, to
build a hook for it in PostGIS?
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The code seems to be only in TestBuilder, not in core JTS libs.
Are you sure you want it in PostGIS, btw ? As it really sounds to me
as something you'd want to compute _temporary_ visualizations for
human consumption (no analitical computations).
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<font face="Times New Roman, Times, serif">Good point. It's a
visualizing tool, so its main use would be in tools like QGIS and
OpenJump. I wonder though whether it would make sense to build an
analytical tool in PostGIS to discover small topology errors,
based on Martin's code. Perhaps something like that is already
under development in the topology code. I'm just looking for
something that can easily clean up this kind of error in vector
maps, IMHO one of the most common and most difficult errors to
find and correct. Just thinking out loud. <br>
<br>
Jan</font><br>
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