On 1/31/2015 9:46 AM, Sander Deryckere wrote:
Updatability can be achieved by adding an id to the imported objects
(that id must be permanent in the source DB), but it's also possible
without id when you develop algorithms to compare OSM data with the
official data.
An ID is not as useful as they might seem on first glance. For the
next round of import checking: there is a new ID which isn't in OSM.
Was that building
1. ..Torn down and deleted from OSM?
2. ..Still present, but deleted by its owner looking for some sort
of 'privacy'?
3. ..An erroneous extra building in the original database?
There is also the case of newly created buildings in OSM and fully
tagged by survey without an ID
Object conflation ideally should occur on each import cycle. Saving
a copy of the original source data can help. Then for the following
import cycle, compare source data directly to get a direct list of
changes from the source.
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