On 28/01/19 04:24, Sergio Manzi wrote:
On 2019-01-27 17:53, OSMDoudou wrote:
Indeed, it's very strange to require mappers do the maths when there is a
notation to indicate the unit and let the renderers do the maths.
Hi!
Why do you talk about math? Do you expect renderers to automatically convert
weights from whatever unit to the one you're using for your locale? Or maybe to
use those weight limits as a parameter for the router?
Yes. The renders have to cope with different units for speed, length, height,
elevation etc. so why not weight?
As has been said before - far easier to find an error in the rendering and
correct it than
find an error in the maths used by a single entry or a single mapper in the
data base.
If this is what you want, then the problem is the parsing of the string used to define the units used within the tag:
as already pointed out, "ton" is the symbol used for both "long" (UK, imperial) and
"short" (US, cental) tons, so we must find a "controlled" way to indicate which measurement system
is in use for the tag.
On the wiki page for units there is now the default unit of the tonne (metric
ton for usa), and then alternative units of st for short ton, lt for long ton.
https://wiki.openstreetmap.org/wiki/Map_Features/Units
I just recently add the lt for long ton, the short ton was already there. If
you want to add other units .. do so.
If the mapper uses the unit 'ton' then they have not complied with the wiki and
there would need to be a decision on using it at all, if using it then what
unit is to be used.
If instead we are not interested in possible computations, then we can live
with the customary way to indicate tons, and deduce from the location which
kind of tons we are talking about, same as if we were traveling to the place
and see the indication on a sign, with our own eyes.
And indeed the same heuristics can possibly be applied to a parser...
Sergio
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