[Tagging] How to tag small canals?

Peter Elderson pelderson at gmail.com
Sat Aug 18 07:53:20 UTC 2018


Sure. But is there a standard method to indicate this uncertainty in OSM, which can be processed by data consumers?

Mvg Peter Elderson

> Op 18 aug. 2018 om 01:35 heeft Warin <61sundowner at gmail.com> het volgende geschreven:
> 
> What you are trying to refer to is 'measurement uncertainty'.
> 
> For a non professional rough guide;
> https://en.wikipedia.org/wiki/Measurement_uncertainty
> 
> Naturally formed water way widths may have a great deal of variation along their widths .. and so the uncertainty will be very high unless specified along short segments. 
> 
>> On 18/08/18 09:11, Peter Elderson wrote:
>> It would not be that hard to add a precision to a measurement. Any measurement. Maybe there already is a standard method for that?
>> 
>> Mvg Peter Elderson
>> 
>> Op 17 aug. 2018 om 20:50 heeft SelfishSeahorse <selfishseahorse at gmail.com> het volgende geschreven:
>> 
>>>> On Friday, August 17, 2018, Christoph Hormann <osm at imagico.de> wrote:
>>>> On Friday 17 August 2018, SelfishSeahorse wrote:
>>>> 
>>>> > Of course we could just use width=*, but it's not always easily
>>>> > possible to measure the width (e.g. in a forest) and sometimes it
>>>> > changes often.
>>>> 
>>>> I would translate this into "i want a subjective non-verifiable 
>>>> classification system but i hide this by defining pro forma verifiable 
>>>> criteria for the classes".
>>> 
>>> A classification based on width is arbitrary, but i don't see why it be subjective.
>>> 
>>>> If you want to map the river width tag width=*, if you don't want to map 
>>>> the width then don't create classes based on width thresholds.
>>> 
>>> Imagine a stream/brook in a forest, not visible on satellite imagery. You can't measure its width on site (because you don't have the equipment or because the soil at its sides is marshy), but you know (estimate) that it's wider than 1 metre, but less wide than 3 metres. In my opinion it's better to have that information that none.
>>> 
>>> If you enter width="1 m - 3 m", data users very likely won't understand it. However if you enter width="2 m", the width value pretends to be exact. Besides it is very unlikely that someone else verifies that value, considering the fact that less than 1% of waterway=* tags have a width=* tag.
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