[Tagging] Accuracy of survey
bsd at volki.at
Tue Dec 23 23:21:52 UTC 2014
On 23.12.2014 17:37, Rainer Fügenstein wrote:
> mapper A, by means of DGPS, MilStd GPS, crystal ball etc., is able to
> achieve an accuracy of, say, a few centimeters and uses it to add new
> nodes (POIs) to OSM.
> some time later, mapper B with his/her ancestors mechanical GPS device
> (*), achieving an accuracy of max., say, 15 meters, surveys the same
> area, figures out that (by his/her point of view) POIs added by mapper
> A are 15 meters off and corrects their location.
> what is needed here is some tag, saying "don't touch these
> coordinates, they've been surveyed with high(est) accuracy".
I used estimated_accuracy=* or gps_accuracy=* a couple of times, but I doubt
that it prevents other mappers from moving or even deleting them. Some use
editors like Potlatch, so they are not aware of tags. Some do thousands of
edits, all of which are validator based "corrections". They do not ask nor
think nor look at tags, except at those reported by the validator.
Friedrich K. Volkmann http://www.volki.at/
Adr.: Davidgasse 76-80/14/10, 1100 Wien, Austria
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