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