[Tagging] Feature Proposal - RFC - temperature

Kotya Karapetyan kotya.lists at gmail.com
Wed Feb 4 09:56:05 UTC 2015


+1 for the proposal as such.

I have suggestions for some parts of the proposal though.

1) I would discourage specification of the temperature without the
scale indication. I have never lived in the US but I see from the Web
that Americans like specifying temperature in degrees Fahrenheit
without mentioning it (the same way as we in Europe use centigrade
without underlying it). Taking into account the international nature
of the OSM community, I foresee a significant risk that the map will
get populated with invalid values. Warin is right about SI units, but
SI is not even strictly followed in the technical and scientific
community, not to mention the general public. Obviously, Americans in
general ignore it by using inches, miles and degrees Fahrenheit :) I
am afraid many people will not have heard about SI guidelines and will
not have read the wiki page in significant detail.

Therefore, for the sake of clarity, I suggest always specifying "F" or
"C" with the temperature value.

2) I suggest clarifying the verbal specification of the temperature.
- Replace "chilled" with "cool" (by analogy with "warm") and also
because "chilled" actually assumes that I know that the object was
purportedly cooled down, which adds yet another uncertainty and is
usually not very relevant;
- remove the definition of "substantially colder" etc., because it
doesn't add any clarity. I agree that it is important to distinguish
between safe and unsafe situations, so let's just do that:

cold — may be unsafe to handle
hot — may be unsafe to handle
adjustable — the object temperature can be changed by consumer/user
variable — the object temperature can vary on its own
ambient — the object always remains at ambient temperature (note that
this may include the object being "cold" and "warm", including being
unsafe to handle, depending on the ambient temperature; think about
water in Siberia rivers in January)

3) For the numeric specification, I suggest adding:
- "above"/"below" options
- "approximate" value
- range of temperatures (using above/below)

temperature:circa = 80 C
temperature:above[:circa] = 300 C
temperature:below[:circa] = 1000 C


On Wed, Feb 4, 2015 at 12:20 AM, Warin <61sundowner at gmail.com> wrote:
> Hi,
> Having flagged this on a past post .. I've now moved to the comments stage.
> Page: https://wiki.openstreetmap.org/wiki/Proposed_features/Temperature
> It may be used with the tags shower, water_tap, bath ... and possibly other
> things present or future.
> --------------
> Default unit is degrees Celsius, this is an SI unit.. not a base unit but
> then few things are, e.g. minutes, hours are not base SI units. See
> http://physics.nist.gov/cuu/Units/units.html for an American explanation.
> Kelvin is not in common use due to the numbers being too cumbersome for day
> to day use of common temperatures, thus Celsius is used.
> ---------------------
> Rendering is a problem .. so far I have
> high temperature; red colour of wavy lines above standard rendered feature?
> Or a red in colour box around standard rendered feature?
> adjustable temperature
> Cold temperature; blue in colour box around standard rendered feature?
> Adjustable temperature? Box around standard rendered feature, red in colour
> at the top fadding to blue at the bottom?
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