[OSM-talk] immutable=yes Fwd: DEC Lands

[Andrew Chadwick]

Ulf Lamping wrote:

>> What's needed here is not an immutable=yes tag but rather a couple of 
>> tags source=DEC and accuracy=definitive which will give GPS toting 
>> mappers the information they need to know that the data in OSM is likely 
>> to be more accurate that their GPS.  They can then take an informed view 
>> about whether or not to mess with it.
>
> Sounds like a good approach. Having something like "You are about to 
> edit data that is probably more accurate (<Xm) than what you can achieve 
> with common GPS equipment. Are you really sure you want to change this?"

+1 from me too. With a positive, non-zero floating-point {number of
metres | dilution of precision} as an allowed value, perhaps.

Perhaps it should decay automatically to less accurate measurements if
people edit it with less accurate equipment. Quite how you assess how
accurate a given device, trace or vector is is left as an exercise for
the reader, naturally. And could be difficult since the OSMdb doesn't
appear to record any of that stuff...

-- 
Andrew Chadwick

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