[OSM-talk] Map Features, maxspeed and maplint

[Karl Newman]

On Tue, Oct 14, 2008 at 11:05 AM, Tristan Scott <trs998 at gmail.com> wrote:

> If this catches on not only do we have a well-defined and easily-processed
> value for "speed" to use in all manner of things, we also have a template
> for defining other data types (bridge height? maxweight?) which might (or
> might not) make the job of the data processor for an map consuming
> application (satnav etc) much easier.
>
> Tristan
>
> 2008/10/14 David Earl <david at frankieandshadow.com>
>
> On 14/10/2008 18:26, Tristan Scott wrote:
>>
>>> Given that SI units are standard across OSM could be define a "speed"
>>> value in addition to "Numeric" "String" etc like so:
>>> (default to kmh as specified before (also means not adding millions of
>>> pointless "kmh" strings to the db)
>>> Factor means "multiply by this to convert to SI - interpreters would
>>> either use value as-is or multiply by Factor for that suffix to get SI
>>> units.
>>> "Suffix" is the entire string after the numerical value, with whitespace
>>> trimmed - so spaced/not spaced suffix wouldn't matter - defining this
>>> rigidly would be ignored by most users, i suspect
>>>
>>> My proposed table:
>>> Unit - Factor
>>> "" - 1
>>> "kmh" - 1
>>> "mph" - 1.609
>>> "knots" - 1.852
>>>
>>
>>
>> +1.
>>
>> I really don't see what all the fuss is about. It's not exactly novel to
>> do it this way: CSS puts units as part of the value.
>>
>> It's what I've been doing all along, except some pedant comes along and
>> changes it to some incomprehensible decimal number almost as soon as I add
>> them to the map (which means I can carry on doing it that way even if others
>> think differently, as they'll get converted automatically as far as i am
>> concerned and I don't have to think about a magic number in km/h).
>>
>> David
>>
>>
What about just using the maxspeed tag with just a number and having a
separate tag for the units. i.e., maxspeed=30; maxspeed_units=mph

Karl
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