On Wed, 2010-09-15 at 09:34 -0600, Simpson Brad-C-Lockheed wrote: > Chris, > > Thanks for responding. I understand the spatialreference map is coarse and > low resolution. However, my position is all coordinates in the general area > are shifted (although I have only looked in the English Channel area and the > Greek Islands so far). And the vmap0 data matches our database. I've only > given one example that is easy to confirm. I do not believe this is a case > of the data being too coarse. > > I would like to migrate from our old database (heritage unknown) to > openstreetmap, but I can't unless I can account for this discrepancy.
This map comparison between OSM and Google satellite shows a good match: http://tools.geofabrik.de/mc/?mt0=mapnik&mt1=googlesat&lon=-2.22122&lat=49.701&zoom=16 This comparison with Yahoo satellite data also shows a good match: http://sautter.com/map/?zoom=13&lat=49.70034&lon=-2.22001&layers=00000BTFFFFFFF It looks like the footpath shown in OSM has been uploaded as a GPX trace which seems to add further confirmation that the island is probably shown in the correct position in OSM. I guess you can look for more 3rd party data to confirm the location, or failing that, you'll need to go there yourself :) Jon _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
