[Tagging] Straw pole Temperature=objective default unit?
Jan van Bekkum
jan.vanbekkum at gmail.com
Sun Apr 12 06:52:41 UTC 2015
As a physicist I don't like any value without units. The degree symbol is
not needed, but C would be great: 21 C, 70 F.
On Sun, Apr 12, 2015 at 6:43 AM John Willis <johnw at mac.com> wrote:
> If it's 42 f, you'd go into hypothermia almost instantly. =}
> Assuming c unless explicit should be enough for mapping.
> > On Apr 12, 2015, at 8:23 AM, Warin <61sundowner at gmail.com> wrote:
> >> On 10/04/2015 4:50 AM, Andy Mabbett wrote:
> >>> On 9 April 2015 at 01:52, Warin <61sundowner at gmail.com> wrote:
> >>> Say a mapper tags
> >>> temperature=42
> >> Under what circumstances would such a tag be used. How would we know
> >> that the actual temperature is not 41 or 43?
> > You want more detail?
> > Say a mapper tags
> > amenity=swimingpool
> > temperature=42
> > ---------------- Is that enough detail?
> > The question is
> > is the 42 taken as degrees Celsius or rejected as an error????
> > Presently 'degrees Celsius' is a little ahead of ' rejection' .
> > ========================================
> > Accuracy? really? in OSM? No dimension entry into OSM includes any
> statement of accuracy ...
> > If you want a full statement of 'accuracy' it would have to be a
> statement of uncertainty with level of confidence and coverage factor.
> > No .. you don't want to go there!!!!!!
> > No measurement is 'error free'. They all have some uncertainty ..
> > Reference http://kcdb.bipm.org/appendixC/search.asp?service=All
> > For example NIST claim, in thermometry, for a liquid in glass
> thermometer at 'normal' temperatures their best uncertainty is 0.02 K
> (neglecting any contribution by the thermometer being calibrated).
> > Note : BIPM uncertainties are adjusted for 95% level of confidence and
> approximately a coverage factor of 2.
> > No .. you don't want to go to statements of errors and accuracy ..
> > Instead .. what would a 'reasonable person' expect for such a statement
> of 'the temperature is 42 °C'? Most would readily accept ±1°C given the
> resolution of the statement. They may even accept ±2°C .. but not ±10°C.
> > What would be acceptable for a statement of 'width is 1 metre' given in
> OSM on a path? Why am I wasting time on such a question? Because Andy
> asked. Suggest you do some research on it Andy.
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