[OSM-talk] Mapping canals
nick.dyer at itdev.co.uk
Thu Jan 24 11:18:39 GMT 2008
Gervase Markham wrote:
> So this is just another example of why allowing people to use any unit
> "as long as they label it" is a bad idea :-)
I am afraid that is a bit of a straw man argument.
The canals in the UK are specified in feet (for example, maximum width a
boat can be, the length of locks, or the depth). If you translate these
values to metres as they enter the database you are throwing away data.
In addition, it goes against the idea that the database should represent
the actual situation on the ground rather than something that makes it
easy to process.
And as has been mentioned, this isn't a new problem for OSM: the
maxspeed tag already carries values in mph - see
for a subset of the discussion we are having here.
In case you're worried about all these units making the database bigger,
it's worth noting that the string "72ft" is still shorter than "21.9456".
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