<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Sure. But is there a standard method to indicate this uncertainty in OSM, which can be processed by data consumers?<br><br><div id="AppleMailSignature">Mvg Peter Elderson</div><div><br>Op 18 aug. 2018 om 01:35 heeft Warin <<a href="mailto:61sundowner@gmail.com">61sundowner@gmail.com</a>> het volgende geschreven:<br><br></div><blockquote type="cite"><div>
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<div class="moz-cite-prefix">What you are trying to refer to is
'measurement uncertainty'.<br>
<br>
For a non professional rough guide;<br>
<a class="moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Measurement_uncertainty">https://en.wikipedia.org/wiki/Measurement_uncertainty</a><br>
<br>
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. <br>
<br>
On 18/08/18 09:11, Peter Elderson wrote:<br>
</div>
<blockquote type="cite" cite="mid:F2B0B490-09BC-4239-9487-629325D0C131@gmail.com">
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It would not be that hard to add a precision to a measurement. Any
measurement. Maybe there already is a standard method for that?<br>
<br>
<div id="AppleMailSignature">Mvg Peter Elderson</div>
<div><br>
Op 17 aug. 2018 om 20:50 heeft SelfishSeahorse <<a href="mailto:selfishseahorse@gmail.com" moz-do-not-send="true">selfishseahorse@gmail.com</a>>
het volgende geschreven:<br>
<br>
</div>
<blockquote type="cite">On Friday, August 17, 2018, Christoph
Hormann <<a href="mailto:osm@imagico.de" target="_blank" moz-do-not-send="true">osm@imagico.de</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">On Friday 17
August 2018, SelfishSeahorse wrote:<br>
<br>
> Of course we could just use width=*, but it's not always
easily<br>
> possible to measure the width (e.g. in a forest) and
sometimes it<br>
> changes often.<br>
<br>
I would translate this into "i want a subjective
non-verifiable <br>
classification system but i hide this by defining pro forma
verifiable <br>
criteria for the classes".</blockquote>
<div><br>
</div>
<div>A classification based on width is arbitrary, but i don't
see why it be subjective.</div>
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
If you want to map the river width tag width=*, if you don't
want to map <br>
the width then don't create classes based on width thresholds.<br>
</blockquote>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>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.</div>
</blockquote>
<blockquote type="cite">
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