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.
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