Bryce, are you looking for some kind of "snapping" to the nearest geometry? I was doing something like that, Craig did a test on that, see https://github.com/neo4j/neo4j-spatial/blob/master/src/test/java/org/neo4j/gis/spatial/TestSpatialUtils.java#L53, there is some basic support for that in
SpatialTopologyUtils.java. Does that help to get started? Feel free to add more utilities and maybe a routing example, when you get it working. Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Tue, Jan 18, 2011 at 5:50 AM, bryce hendrix <[email protected]> wrote: > Craig, > > I've ran into a bit of a stumbling block. I am attempting to do find a > simple route using A* from 2 nodes on 2 different ways. What is the best way > to find the points closest to 2 reference points which are on ways? Assuming > I've got those nodes, is there anything special I have to do, other than > setting up the estimate and cost evaluators? > > If I can figure this out, I'll submit my example back to you guys. I'm > excited about this stuff, but I seem to be discovering the limits of the > docs. > > Bryce > > On Sun, Jan 16, 2011 at 7:11 PM, Craig Taverner <[email protected]> wrote: > >> Great that they all work :-) >> >> Good luck with the rest of the project and keep us posted, we're interested >> in any feedback on the API. >> >> (getting lat/long mixed up is one of those things we all keep doing, I'm >> pretty sure I did it once as recently as last month ... ;-) >> >> On Sun, Jan 16, 2011 at 11:52 PM, bryce hendrix <[email protected] >> >wrote: >> >> > Craig, Peter, >> > >> > Its useful if I get the latitude and longitude in the correct order for >> the >> > Point. Ugh. I've found >> > that SearchPointsWithinOrthodromicDistance, SearchClosest, >> > and SpatialTopologyUtils.findClosestEdges all work for me. Looks like my >> > project is well on its way now, thanks for the help. >> > >> > Bryce >> > >> > On Sun, Jan 16, 2011 at 3:16 PM, Craig Taverner <[email protected]> >> wrote: >> > >> > > The SearchPointsWithinOrthodromicDistance basically does a search on a >> > > rectangular bounding box, and then inside the result set filters by >> > > distance >> > > from the center. The filter probably works only on points as implied by >> > the >> > > class name. >> > > >> > > The SpatialTopologyUtils class has a method findClosestEdge, which will >> > do >> > > what you are looking for. If you call it without a distance value, it >> > will >> > > take 1% of the total span of your layer as the search window, so if >> this >> > > does not make sense for your data (eg. your layer covers a small area, >> as >> > > you hinted at), then pass in the distance in units of the coordinate >> > system >> > > of the layer (probably WGS84, degrees, if you are using only OSM data). >> > Try >> > > it out and let us know. >> > > >> > > See: >> > > >> > > - >> > > >> > > >> > >> https://github.com/neo4j/neo4j-spatial/blob/master/src/main/java/org/neo4j/gis/spatial/SpatialTopologyUtils.java >> > > - >> > > >> > > >> > >> https://github.com/neo4j/neo4j-spatial/blob/master/src/test/java/org/neo4j/gis/spatial/TestSpatialUtils.java >> > > >> > > >> > > On Sun, Jan 16, 2011 at 11:19 AM, Peter Neubauer < >> > > [email protected]> wrote: >> > > >> > > > Bryce, >> > > > I think (Craig, correct me if I'm wrong) you need to have a Point >> > > > layer to be able to do that search. The default OSM layer is >> > > > containing a lot of geometries, so I think you first should define a >> > > > layer on top of the full imported one, then search. I did something >> > > > like that in another spike, see >> > > > >> > > > >> > > >> > >> https://github.com/popdevelop/snapplr/blob/master/server_java/src/main/java/com/geosnappr/TaginfoImporter.java#L312 >> > > > >> > > > The layer is defined with something like >> > > > >> > > > >> > > >> > >> https://github.com/neo4j/neo4j-spatial/blob/master/src/test/java/org/neo4j/gis/spatial/TestDynamicLayers.java#L26 >> > > > on top of the imported full data layer. >> > > > >> > > > Does that help? >> > > > >> > > > Cheers, >> > > > >> > > > /peter neubauer >> > > > >> > > > GTalk: neubauer.peter >> > > > Skype peter.neubauer >> > > > Phone +46 704 106975 >> > > > LinkedIn http://www.linkedin.com/in/neubauer >> > > > Twitter http://twitter.com/peterneubauer >> > > > >> > > > http://www.neo4j.org - Your high performance graph >> > > database. >> > > > http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing >> > party. >> > > > >> > > > >> > > > >> > > > On Sat, Jan 15, 2011 at 10:58 PM, bryce hendrix < >> > [email protected]> >> > > > wrote: >> > > > > I'm pretty new to neo4j, so please excuse me if this is a FAQ. >> > > > > >> > > > > I exported OSM data for a city from the OSM site, then imported it >> > > using >> > > > the >> > > > > OSMImporter. I can see the layer via the webserver, so I know if >> got >> > > > > imported okay. Now I would like to find the way nearest to a >> > coordinate >> > > > via >> > > > > the Java API, but I'm not really sure how to do that. I've tried >> > using >> > > > > SearchPointsWithinOrthodromicDistance, but the results of the query >> > are >> > > > > always empty. Can someone give me some tips, or provide a simple >> > > example? >> > > > > >> > > > > Thanks in advance, >> > > > > Bryce >> > > > > _______________________________________________ >> > > > > Neo4j mailing list >> > > > > [email protected] >> > > > > https://lists.neo4j.org/mailman/listinfo/user >> > > > > >> > > > _______________________________________________ >> > > > Neo4j mailing list >> > > > [email protected] >> > > > https://lists.neo4j.org/mailman/listinfo/user >> > > > >> > > _______________________________________________ >> > > Neo4j mailing list >> > > [email protected] >> > > https://lists.neo4j.org/mailman/listinfo/user >> > > >> > _______________________________________________ >> > Neo4j mailing list >> > [email protected] >> > https://lists.neo4j.org/mailman/listinfo/user >> > >> _______________________________________________ >> Neo4j mailing list >> [email protected] >> https://lists.neo4j.org/mailman/listinfo/user >> > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
