[Tagging] Straw pole Temperature=objective default unit?

[John Willis]

If it's 42 f, you'd go into hypothermia almost instantly. =}

Assuming c unless explicit should be enough for mapping. 

Javbw


> 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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