Merced County Association of Governments has building footprints, addresses and other digital files that can be imported into OSM. GIS Analyst Natalia Austin was very helpful in quickly answering questions and confirmed that the files are public domain and can be freely used. The county has both addresses and building footprint files available. They may update the data in the future, but the county only does it as it has time and doesn't have a specific time schedule, so this will probably be a one-time import, although it may be worth checking back in the next couple years to see if they have made any major updates in either of the files. The import will include information merged and conflated into one file.
I have downloaded with Turbo API the few buildings already in the county and have verified that none overlap with existing buildings. I left the existing buildings in place as much as possible and merged any existing address nodes or pois manually with the new buildings. Unfortunately not every building in the county was digitalized, but most address points were. Where there was a direct one-to-one relation, I merged the address point with the building outline. When more than one point occupy a building, the nodes were kept separate from the building outline. I added 100s of buildings manually from imagery so blocks would have the missing outlines rather than just the address node. The original shapefiles included the name and type of business. The extra category allowed them to be matched to their corresponding OSM tags. Both name and OSM category have been included when possible, and the original tags were deleted. The shapefile created unnecessary relations with several of the buildings near each other. These have been manually removed as much as possible, leaving just the tags. I have gone through and tried to make sure the addresses that are not conflated with the buildings are as close to the building as possible and there are no overlapping address points or extra floating address points that don't correspond to anything. I expanded the street abbreviations and converted to proper case items that were in all caps. The JOSM file is available for review at https://www.dropbox.com/s/byclptdmlevy1p8/Merced%20buildings%20and%20addresses.osm?dl=0. See more on the import wiki page at http://wiki.openstreetmap.org/wiki/Import/Catalogue/Merced_County_Buildings . Please let me know with any thoughts, questions or concerns. Thanks, Nathan
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