> Of the authorities I have managed to measure, the following all show more > road mapped than the DfT believes exists: > There could be a number of reasons for this;
1. Our boundaries are plotted from old parish boundaries on NPE typically. I had to move the Trafford/Manchester boundary in a couple of places because it has obviously been changed when the Metropolitan Borough was set up. Also, NPE has variable accuracy. i.e. we could easily be including roads in OSM's count which actually are in different authorities on the ground. 2. I'm pretty sure the DfT list will include only roads maintainable at public expense or "adopted roads". In some areas there are quite a few unadopted roads - which could easily be on OSM. Roads in newly constructed housing estates sometimes take a while for these to become adopted. There are many new housing estates on OSM. In addition, have you included "highway=service" in your tally? Roads in supermarket car parks, driveways etc. won't be on the DfT list. i.e. we could easily be including roads in OSM's count which are not going to be counted on the DfT list. _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
