Pieren <[email protected]> wrote: > On Tue, Feb 21, 2012 at 4:25 PM, Johann H. Addicks <[email protected]> > wrote: > >> Is it possible to *know* which of the two is right? > > Probably none of them. > The aerial imagery alignment accuracy depends on the concerned area > (Bing is using many providers), the topology (mountains are more > difficult to rectify than flat land) and may change on the zoom level. > A single GPS trace is also not a good reference (can be +- 5 to 10 > meters, even more in urban zones). Best is an average of several > traces done at different time intervals (with different satellites > positions). > Even better are survey/benchmarks maintained by governmental or > private geographical agencies (if you are allowed to use them). > > Pieren > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies
One oddity I have noticed with both car and cell-phone GPS is that it seems to be more accurate when I am moving than when I am standing still. -- John F. Eldredge -- [email protected] "Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
