Peter, I think my problem is more of understanding how the graph is built from OSM data. The method of find the closest edge gives me the way geometry, but (please correct me if I am wrong) I need to find the closest OSM node (Node with "lat" and "lon" properties) in the geometry.
Thanks, Bryce On Tue, Jan 18, 2011 at 2:05 AM, Peter Neubauer < [email protected]> wrote: > 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 > _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
