Hello, I wrote a program which imports height informations to the existing buildings in Paris, France.
The source data license is ODbL and I have added a new row in the import catalog page. The program simply adds building:levels tags on building elements which : - don't have yet a such tag (in order to not disturb work already done by other contributors) - have good matching score with the imported buildings. More informations are on the Wiki page: http://wiki.openstreetmap.org/wiki/Paris,_France/Buildings_Heights_Import I'd have a few questions about the source : In the Wiki it's written "for large edits the source tag can be added to the changeset tags rather than in the features themselves". That's what I'm doing for now but I'd prefer to set the source tag on each updated building. The problem is that all parisian buildings have already a source tag valued because they have been imported from cadastre of the French gouvernement. My question is: should I add a new source tag like tag source:building:levels=my_source_label or reuse the source tag by concatening my source label (example: tag source = previous_source_label + my_source_label) ? If the answer is to reuse the source tag what's the best way to do the concatenation : with ". ", with " + " or with a carriage return ? Thanks for your help, Vincent.
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