[OSM-talk] Mapping well-known area: ok to guess?

[Mike Collinson]

At 11:33 AM 21/10/2007, Frederik Ramm wrote:
>Hi,
>
>     found myself mapping a very well-known residential area where roads 
>are not grid-like (rather crooked) but still very much parallel to each 
>other; didn't have a GPS track for one in the middle, so just drew it in 
>  so that it fit with the others.
>
>Do you think that (a) this is perfectly ok, (b) this should not be done 
>as it pretends to have an accuracy which isn't there, or (c) can be done 
>but should be tagged somehow? If (c), what would you use? "source=gut"? 
>"note=guessed"?


(c)

Either source=interpolation or source=guess.  When it is guessed then I put something like "note= exact position needs verifying"

PS Since data can now come from  variety of sources, I now always try to tag the source of *everything* to help other mappers.  For example, source=survey may have non-existent kinks due to urban canyoning, source=landsat and source=yahoo_imagery may be misaligned, source=npe may be distorted.

Mike
Stockholm