On Tue, Oct 14, 2008 at 11:05 AM, Tristan Scott <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> > > 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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