[OSM-dev] Source tag on each node

[Alan Mintz]

At 2010-12-19 00:59, Wyo wrote:
>I've just realised that rather many nodes have their own source tag, even 
>if they are just part of a way with identical tag. So I guess a rather 
>large part of the data consists of these source tags. While this isn't a 
>problem for files (thanks to compression) it enlarges the database quite a bit.
>
>Are these tags really necessary or could they be remove as long as the way 
>has a source tag? Could anybody provide an estimate how much space 
>reduction could be gained? Could anybody create a report on how many nodes 
>have identical tags as their way?

Do you have an example?

I tag intersections of ways as I survey them with source=*, source_ref=* 
among other things, like signalling, turn restrictions, etc. Sometimes, the 
source value is the same as that of the way, but that is only coincidental 
- it's not a duplication.

--
Alan Mintz <Alan_Mintz+OSM at Earthlink.net>