<div dir="ltr">No, that is in fact excellent (actually irritatingly good, I was just finishing up a write up of my own...), but I should have been more specific.  I'm looking for a reference to point to for the why it works, not the how, i.e. how does the structure of the R-Tree index lends itself to creating a distance operator -- the hierarchy of the tree, the distance between branches, or what not.<br>
<br>Best,<br>Steve<br><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Nov 20, 2013 at 2:51 PM, Paul Ramsey <span dir="ltr"><<a href="mailto:pramsey@cleverelephant.ca" target="_blank">pramsey@cleverelephant.ca</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hopefully I'm not too immodest in saying this<br>
<br>
<a href="http://workshops.boundlessgeo.com/postgis-intro/knn.html" target="_blank">http://workshops.boundlessgeo.com/postgis-intro/knn.html</a><br>
<br>
P<br>
<div><div class="h5"><br>
On Wed, Nov 20, 2013 at 10:49 AM, Stephen Mather<br>
<<a href="mailto:stephen@smathermather.com">stephen@smathermather.com</a>> wrote:<br>
> Hi All,<br>
><br>
> What's the best (normal) human readable reference for the PostGIS distance<br>
> operators-- but deep enough to talk about the use of index structure in the<br>
> use of the operators?<br>
><br>
> Thanks,<br>
> Best,<br>
> Steve<br>
><br>
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