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
<selfishseaho...@gmail.com <mailto:selfishseaho...@gmail.com>> het
volgende geschreven:
On Friday, August 17, 2018, Christoph Hormann <o...@imagico.de
<mailto:o...@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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