<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">Daniel,</div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">This is interesting stuff, could you post some example function signature and input/output pictures on the wiki so we can do a little design review. I thing it’s very exciting and am very positive about it.</div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;">P</div> <div id="bloop_sign_1421342868783981056" class="bloop_sign">
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-- <br>
Paul Ramsey<br>
http://cleverelephant.ca<div>http://postgis.net
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</div> <br><p style="color:#000;">On January 15, 2015 at 4:14:44 AM, Daniel Baston (<a href="mailto:dbaston@gmail.com">dbaston@gmail.com</a>) wrote:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>
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<div>Hello,<br>
<br>
I'm working on a couple of C-language functions to solve some
clustering problems I frequently face in PostGIS. I'm
wondering if there may be any level of interest in including such
functions in the project? I would be happy to flesh these out
to include the error-handling and unit-testing that would be
required.<br>
<br></div>
Function #1 takes a GeometryCollection and returns the same
geometries, re-aggregated into groups of interconnected geometries
(solving a question I posted about at <a href="http://gis.stackexchange.com/q/94203">http://gis.stackexchange.com/q/94203</a>
)<br>
<br></div>
<div>(Internally this builds an STRtree using GEOS and uses a
union-find structure to identify connected components....as an
aside, I am wondering if there is some way to take advantage of a
database spatial index that may already exist)<br></div>
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Function #2 (not written) would solve a related problem - we want
to take a set of points and return a set of MultiPoints, where each
point in a MultiPoint is within distance X of some other point in
the MultiPoint.<br>
<br></div>
Thanks,<br>
Dan<br></div>
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