On Thu, Dec 13, 2012 at 12:46 PM, Jeff Meyer <[email protected]> wrote: > On Thu, Dec 13, 2012 at 8:55 AM, Josh Doe <[email protected]> wrote: > >> Obviously the number actually imported will be less, since I'm assuming >> there are a few structures already mapped in OSM. :) > > > Should there be an implicit assumption that structures already mapped in > OSM are of better quality than those being reviewed for import? Obviously, > there shouldn't be a blind overwrite or duplication, but the process Jason > has outlined involves a fair amount of curated review. >
For the first take, yes, don't import any structures that are already mapped (or really, just overlap), which is what he seems to have done with the preprocessing step. It would be useful to create a second OSM file with structures that were excluded in this preprocessing step, so a second step could be to compare them in case MassGIS is more accurate or up to date than what is in OSM. Perhaps Jason has already done this, or at least saved the original database so this can then be run. It would be very messy to determine which buildings were excluded after the import is done, without looking at the full history of each building. -Josh
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