[Tile-serving] [openstreetmap/osm2pgsql] LUA: calculate length (m) and area (m^2) (Discussion #1756)

[Jochen Topf]

PR: Please do. 

mercator/3857: No, not in meter, but something close enough in lower latitudes and for shorter distances. Read https://en.wikipedia.org/wiki/Mercator_projection for all the details. :-)

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