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Thank you for your post. I will look into geos.<br><br>-Daniel<br><br><br>> Date: Thu, 11 Mar 2010 18:51:58 -0500<br>> From: warmerdam@pobox.com<br>> To: proj@lists.maptools.org<br>> Subject: Re: [Proj] Region Finder<br>> <br>> ` ` wrote:<br>> > I have a the latitude/longitudes for a school boundary and I want to <br>> > know if an address is in that boundary. Is there a way to find out if a <br>> > coordinate is within a latitude/longitude boundary? Or even better <br>> > would be to use an address and find out what boundary it is in.<br>> > <br>> <br>> Daniel,<br>> <br>> There are two parts to your question, neither of which have to do with<br>> PROJ.4:<br>> <br>> 1) The ability to determine the lat/long location associated with an<br>> address (ie. a postal address). This is called geocoding. The following<br>> posts by Martin Davis should provide a bit of background on geocoders.<br>> <br>> http://lin-ear-th-inking.blogspot.com/2010/03/open-source-geocoders.html<br>> http://lin-ear-th-inking.blogspot.com/2010/03/more-open-source-geocoders.html<br>> <br>> 2) The ability to determine if a point is within a polygon or conversely<br>> which polygon within a set the point is in. This is a geometry operation.<br>> One of the best known geometry libraries is GEOS (a C++ port of JTS which<br>> oddly is also Martin Davis' project).<br>> <br>> http://geos.osgeo.org/<br>> <br>> Good luck,<br>> -- <br>> ---------------------------------------+--------------------------------------<br>> I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com<br>> light and sound - activate the windows | http://pobox.com/~warmerdam<br>> and watch the world go round - Rush | Geospatial Programmer for Rent<br>> <br>> _______________________________________________<br>> Proj mailing list<br>> Proj@lists.maptools.org<br>> http://lists.maptools.org/mailman/listinfo/proj<br> <br /><hr />Hotmail: Trusted email with powerful SPAM protection. <a href='http://clk.atdmt.com/GBL/go/210850553/direct/01/' target='_new'>Sign up now.</a></body>
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