<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Well I could say that using PostGIS ST_Intersects with "messy data" always seems to give me TopologyExceptions. I've had luck with various combinations of ST_SnapToGrid and ST_Buffer(0), but with messy data there always seems to be some weird case that requires manually edits. Sorry to be the bearer of bad news. Frankly, I don't understand why the GEOS library has to throw that error. <div class=""><br class=""></div><div class="">I would encourage you to isolate particular problems and file bug reports. Improvements in GEOS to eliminate the underlying error(s) would certainly be welcome. </div><div class=""><div class=""><br class=""><div apple-content-edited="true" class="">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="">--</div><div class="">John Abraham</div><div class=""><br class=""></div></span></div><div><blockquote type="cite" class=""><div class="">On Feb 8, 2015, at 1:43 PM, BladeOfLight16 <<a href="mailto:bladeoflight16@gmail.com" class="">bladeoflight16@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote">On Tue, Feb 3, 2015 at 11:28 AM, BladeOfLight16 <span dir="ltr" class=""><<a href="mailto:bladeoflight16@gmail.com" target="_blank" class="">bladeoflight16@gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class=""><div class="">I'm trying to create a polygon
overlay. The basic process is relatively simple: 1) Get the boundaries
2) Union the boundaries to node the linestrings 3) Polygonize the noded
outlines 4) Filter out holes using a contains or intersects test. The
problem I'm running into is that I'm getting "GEOSUnaryUnion:
TopologyException: found non-noded intersection between LINESTRING"
errors from ST_Union. <br class=""></div></div></div></div></div></div></div></div></div></blockquote><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote"><div class=""> </div></blockquote><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex" class="gmail_quote"><div class="">[a lot snipped] <br class=""></div></blockquote><div class=""><br class=""></div><div class="">I haven't seen any response to this. I was just wondering if anyone else had a chance or intentions to look this over. Granted, it's pretty long and involved (sorry for that), but I thought all the details I included were important. I do know it went through the mailing list; someone on IRC helped me find it in the... I guess it's not the archives; I don't know what it's called. But the online browsing mechanism. Thanks to anyone who's taking a look.<br class=""></div></div></div></div>
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