[Tagging] simple_brunnel : one node bridge like xing highway over waterway

Richard Z ricoz.osm at gmail.com
Thu Apr 3 19:43:23 UTC 2014


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



More information about the Tagging mailing list