Are there any good examples for converting the shapefile data to JTS geometries? I ran into problems using WSG84 coordinates which don't map to cartesian coordinates. I understand that JTS is a cartesian coordinate library.
~Ben Holland On Fri, Aug 6, 2010 at 9:44 AM, Jody Garnett <[email protected]> wrote: > Those were good suggestions. > > I was thinking for each country; create a prepared geometry, or that data > structure for a point in polygon test, and run through all of the points (or > if you are worried load the points into a spatial index and use the polygon > extent to pull out a small number to test against). > > Jody > > On 07/08/2010, at 12:32 AM, [email protected] wrote: > >> I assume your geometries are stored in shape files. >> >> Possibility 1, using SQL) >> Use a spatial sql extender like postgis, import your shape files into >> sql tables and create a query using a sql statement with spatial >> predicates (st_contains, st_intersects) >> >> Possibility 2, using JAVA) >> Read your polygons from a shape file. >> Read your point from the shape file and create ONE Multpoint JTS geometry. >> Intersect the Multipoint geometry with each polygon. >> The result of the intersection is a Multipoint geometry containing all >> points within the polygon. >> >> Hope this helps >> >> Quoting Andreas Schildbach <[email protected]>: >> >>> Hi there, >>> >>> I have got 300.000 Geo-Coordinates (European Public Transport Stops) and >>> like to determine for each of them to which country they belong - >>> preferably in Java code. Due to the sheer number of coordinates, I think >>> I cannot use one of the available web services (request limits). >>> >>> I was pointed to GT2, but am unable to find a simple example to build >>> on. I found TM_WORLD_BORDERS-0.2 data which seems to contain the country >>> shapes I need. >>> >>> Can you give me a pointer to some code? >>> >>> Best regards, >>> >>> Andreas >>> >>> ------------------------------------------------------------------------------ >>> This SF.net email is sponsored by >>> >>> Make an app they can't live without >>> Enter the BlackBerry Developer Challenge >>> http://p.sf.net/sfu/RIM-dev2dev >>> _______________________________________________ >>> Geotools-gt2-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users >>> >> >> >> >> ---------------------------------------------------------------- >> This message was sent using IMP, the Internet Messaging Program. >> >> >> >> ------------------------------------------------------------------------------ >> This SF.net email is sponsored by >> >> Make an app they can't live without >> Enter the BlackBerry Developer Challenge >> http://p.sf.net/sfu/RIM-dev2dev >> _______________________________________________ >> Geotools-gt2-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > > > ------------------------------------------------------------------------------ > This SF.net email is sponsored by > > Make an app they can't live without > Enter the BlackBerry Developer Challenge > http://p.sf.net/sfu/RIM-dev2dev > _______________________________________________ > Geotools-gt2-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
