On Thu, Apr 03, 2014 at 06:08:46PM +0100, Dave F. wrote: > On 02/04/2014 17:14, Richard Z. wrote: > >as explained in the rationale the dimensions of the bridge/culvert > >are frequently only a fraction of the achievable precision. Think > >of a track crossing a small creek in a forest valley int the > >mountains. The GPS precision will be 10 meters if you are lucky, > >the brunnel 2-3m. Mapping this the old fashioned way will produce > >junk data, not precision. > > Rubbish. Please don't rely on a GPSr. It is only one, of many, ways > to survey. If I see a small bridge over a stream, say 3m I'll map is > as that, because that's how it accurately is in the real world. Some > users have access to detailed aerial imagery to help map accurately.
so again: *** <<a small creek in a forest valley int the mountains >> *** Where is your aerial imagery? I want that!!!!!! In the mountains you are very lucky if your imagery has less than 10 meter offset and forests render most aerial imagery useless. Richard _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
