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<div class="Normal"><span style='font-size: 10pt;'>Perhaps I'm wrong, but take a
look at the PostGIS Documentation
http://postgis.refractions.net/docs/ch06.html#id2529854</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>All the things you are
looking for are described here.</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>Cheers,</span><br><span style='font-size: 10pt;'>Horst</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>-----Ursprüngliche
Nachricht-----</span><br><span style='font-size: 10pt;'>Von: Brent Wood
[mailto:pcreso@pcreso.com]</span><br><span style='font-size: 10pt;'>Gesendet am:
Freitag, 17. November 2006 03:36</span><br><span style='font-size: 10pt;'>An:
PostGIS Users Discussion</span><br><span style='font-size: 10pt;'>Betreff: Re:
[postgis-users] dynamic segmentation</span></div>
<div class="Normal"><br><br></div>
<div class="Normal"><span style='font-size: 10pt;'>P Kishor
wrote:</span><br><span style='font-size: 10pt;'>> Someone asked me recently
about open source dynamic
segmentation</span><br><span style='font-size: 10pt;'>> solutions. I thought,
let's ask the PostGIS community. Is
this</span><br><span style='font-size: 10pt;'>> possible with PostGIS? If
not, does anyone know of other open
source</span><br><span style='font-size: 10pt;'>> solutions for
ds?</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>It sort of depende what you
do with dynamic segmentation, some is easily
doable</span><br><span style='font-size: 10pt;'>with PostGIS, other stuff is
harder.</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>For example, having a single
line feature, representing say, a pipeline.</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>DS can allow various segments
of this to have some different attributes,
like</span><br><span style='font-size: 10pt;'>identifying steel & concrete,
or above ground & underground sections. You
can't</span><br><span style='font-size: 10pt;'>do this quite the same way in
PostGIS, but having separate features with
a</span><br><span style='font-size: 10pt;'>common attribute, such as 5 separate
line segments with a common
pipeline_id,</span><br><span style='font-size: 10pt;'>as well as a
multiline/geometrycollection representing the composite
feature</span><br><span style='font-size: 10pt;'>means you can achieve
comparable functionality using appropriate SQL &
data</span><br><span style='font-size: 10pt;'>structures.</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>So does PostGIS "do" dynamic
segmentation? Strictly speaking, not really.</span></div>
<div class="Normal"><br></div>
<div class="Normal"><span style='font-size: 10pt;'>Can functionality equivalent
to dynamic segmentation be implemented
using</span><br><span style='font-size: 10pt;'>PostGIS? Quite often
yes.</span></div>
<div class="Normal"><br><br></div>
<div class="Normal"><span style='font-size: 10pt;'>Cheers,</span></div>
<div class="Normal"><span style='font-size: 10pt;'> </span><br></div>
<div class="Normal"><span style='font-size: 10pt;'> Brent Wood</span></div>
<div class="Normal"><br><br><span style='font-size: 10pt;'> </span><br></div>
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