<div dir="ltr">usually all is based on JST test set. FYI <a href="https://en.wikipedia.org/wiki/JTS_Topology_Suite">https://en.wikipedia.org/wiki/JTS_Topology_Suite</a><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br></div><div>Luigi Pirelli<br><br>**************************************************************************************************<br>* LinkedIn: <a href="https://www.linkedin.com/in/luigipirelli" target="_blank">https://www.linkedin.com/in/luigipirelli</a><br>* Stackexchange: <a href="http://gis.stackexchange.com/users/19667/luigi-pirelli" target="_blank">http://gis.stackexchange.com/users/19667/luigi-pirelli</a><br>* GitHub: <a href="https://github.com/luipir" target="_blank">https://github.com/luipir</a><br>* Book: <a href="https://www.packtpub.com/eu/application-development/mastering-geospatial-development-qgis-3x-third-edition" target="_blank">Mastering QGIS3 - 3rd Edition</a></div><div>* Hire a team: <a href="http://www.qcooperative.net" target="_blank">http://www.qcooperative.net</a><br>**************************************************************************************************</div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 11 Jan 2023 at 04:24, Nicolas Cadieux via QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Hi,<div><br><div>I am curious to learn the math behind topology.  For example, I would like to know how something like “selecting points in a polygon “ is actually done from a programming point of view.  If you have a good resource (books, video, articles…) please send it my way.</div><div><br></div><div>Thanks<br><br><div dir="ltr">Nicolas Cadieux<div><a href="https://gitlab.com/njacadieux" target="_blank">https://gitlab.com/njacadieux</a></div></div></div></div></div>_______________________________________________<br>
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