[OSM-dev] Duplicated nodes in Potlatch

David Earl david at frankieandshadow.com
Sun Oct 5 17:12:11 BST 2008

On 05/10/2008 17:00, Matt Amos wrote:
> On Sun, Oct 5, 2008 at 1:02 PM, Richard Fairhurst <richard at systemed.net> wrote:
>> Rogier Wolff wrote:
>>> Number one has the disadvantage of allowing the database to grow
>>> bigger than it needs to be.
>> Heh. Of course, we have an elephant in the room there - one which,
>> mercifully, 0.6 will address. I committed a change last night (not
>> deployed yet) so that amf_controller filters out created_by tags on
>> nodes before sending them to Potlatch, which ignores them anyway. On
>> average it cuts the amount of data transmitted by about 25%....
> just out of interest, i did a quick check on a recent UK extract: 65%
> of all tags are created_by and that 87% of created_by tags are JOSM.
> i was quite surprised :-)

And this underestimates it because Potlatch replaces any created_by's on 
objects originally created by JOSM, but JOSM doesn't replace Potlatch's 

You can see the same effect in ItoWorld's OSMMapper: often Potlatch is 
used to tweak, but JOSM used for the heavyweight bulk mapping.


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