[OSM-talk] Import of buildings in Chicago

[Mike N]

On 5/27/2012 2:53 PM, Alan wrote:
>> As I discussed with you, I am no longer uploading data with the tag and will
>> >  go back to remove the tag from the existing data.
> I object.
>
> An ID tag is highly useful for future reconciliation and/or synchronization later.

   I used to agree with you, but in terms of minimum labor, updates are 
best performed by retaining the original upload data, then doing a 
conflation between the original data and a later update.   That will 
highlight only changes from the original source, and only those 
differences will need to be manually merged into OSM.