Hi,
I like your ideas about is_in and urban areas. But I have doubts about
practical results. IMO areas like landuse=residential or place=city/town
aren't mapped well in OSM data. So even if you add some new features to
mkgmap, it won't be useful, because input data is not precise.
Some consideration about urban area. I think using buildings or house
numbers as indication of urban area won't be reliable. Mostly because
these are data from imports, so some cities get them while others still
do without. Probably highway's junctions (crossroads) could be the best
indication of urban area. Roads are usually mapped correctly and number
of junctions shows complexity of road network.
--
Best regards,
Andrzej
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