If I undestood it well enough and you are trying to match GPS tracked points upon a road system, you should be careful about crossings. Where two roads cross, a GPS point may be nearer to the crossing road instead of the one the vehicle actually was. So you should ensure to somehow "stick" to the "correct" road. Maybe by calculating the azimuth of each individual two-consecutive-points segment and searching for the road nearest to the ending point of the segment _and_ with the azimuth most similar to the segment itself. Obviuosly sometimes a vehicle actually turns into a crossing road, so you should also recognize that somehow and _don't_ "stick" in that case...
Bye Paolo Rizzi > -----Messaggio originale----- > Da: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] conto di > searchelite > Inviato: giovedì 17 luglio 2008 16.23 > A: postgis-users@postgis.refractions.net > Oggetto: RE: [postgis-users] match line with road segment > > > > > > Paragon Corporation-2 wrote: > > > > You may be better off snapping the points to the line first > before you do > > a > > make line. Take a look at Paul's blog entry. > > > > > > > http://blog.cleverelephant.ca/2008/04/snapping-points-in-postgis.html > > > > Sounds similar to what you are trying to do. > > > > Hope that helps, > > Regina > > > > > > Thanks for the reply...Yes, I already did that..so, is there > any idea what > should i do next? > thanks > -- > View this message in context: > http://www.nabble.com/match-line-with-road-segment-tp18479996p 18509643.html Sent from the PostGIS - User mailing list archive at Nabble.com. _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
