[OSM-newbies] Updating already uploaded data

[Jason Reid]

Bob Jonkman wrote:
> Hi all:  I spent the weekend cycling all over town, collecting map 
> tracks. Sunday night I tagged and uploaded it using JOSM, and saved the 
> file. 
>
> Yesterday I corrected a few small errors (node positions) and added 
> some additional tags (footpaths, playgrounds), and re-saved the file.
>
> Can I upload the same file with the updates?  Will OSM create duplicate 
> nodes, or does it recognize a moved node?
>
> Thanx,
> --Bob.
>
> -- -- -- --
> Bob Jonkman <bjonkman at sobac.com>         http://sobac.com/sobac/    
> SOBAC Microcomputer Services              Voice: +1-519-669-0388       
> 6 James Street, Elmira ON  Canada  N3B 1L5  Cel: +1-519-635-9413
> Software   ---   Office & Business Automation   ---   Consulting
>
>
>   
You can upload from the same file. When JOSM uploads a new node (or way, 
or relation) it saves the ID that the server generates in the file, and 
thats sent with the object if you modify it locally and upload it again. 
However one thing that is suggested to do before you upload, especially 
if some time has passed, is to just download the area in JOSM again, 
just in case someone else has modified things in the meantime. If there 
are any conflicts JOSM will prompt you and you can choose which version 
to keep.

-Jason Reid