I have been using the National Map website to download some topographic maps and I can't help noticing a big difference between the old and new. Historical USGS topographic maps have building outlines on them, but current ones do not. Current maps have things like schools and cemeteries, but no outlines depicting general built structures.
Is there a reason for this omission?
Is there a data source where building information is available?
My apologies if this is not the correct forum for these questions.