[Tagging] How to tag small canals?

Peter Elderson pelderson at gmail.com
Sat Aug 18 14:11:17 UTC 2018

Without getting into scientific, expert or philosophic discussions, I think it would not hurt to have a standardized way of recording say a bandwidth for dimensions like width and ele. The example in this case was width=3 m - 6 m or so, with the assumpion this notation would not be usable to data users. I’m just saying that it would not be that hard to find a processable notation for this, and simply asked if it already exists or has been proposed. 

Agreeing on it is a different matter, especially in OSM circles.

Mvg Peter Elderson

> Op 18 aug. 2018 om 10:44 heeft Christoph Hormann <osm at imagico.de> het volgende geschreven:
>> On Saturday 18 August 2018, Peter Elderson wrote:
>> Sure. But is there a standard method to indicate this uncertainty in
>> OSM, which can be processed by data consumers?
> This is outside the scope of of OSM IMO and not practical for mappers to 
> determine in a meaningful way.  You can specify the method used to 
> determine the width (using source:width=*) and different methods will 
> have different inherent measurement accuracies but the accuracy of the 
> values depends on lots of other factors beyond that.
> Practically mappers have usually no way to verifiably determine the 
> accuracy of their measurements unless they have a reference value of 
> known high accuracy in which case the whole excercise is pointless.  
> Theoretically mappers could practice their measurement skills and 
> assess their personal measurement accuracy based on test measuring a 
> statistically significant number of cases under comparable 
> circumstances with a known accurate reference value but practically 
> this is not feasible.
> -- 
> Christoph Hormann
> http://www.imagico.de/
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