Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It only takes a minute to sign up.
Sign up to join this community
I am designing a map of very densely populated area in Tilemill. I am using OSM building data. Due to having a lot of buildings it is very difficult to differentiate one building to another.
Is there any way to reduce all building polygon sizes to 95% or 98% so that buildings can easily be differentiate each other?
A few thoughts:
simplest: remove borders at low zoom.
shrink via carto: use line-offset: <some small negative number> to inset the building border and remove the polygon-fill, though this can create strange artifacts around corners.
shrink via PostGIS: use ST_Buffer(way, <negative buffer in meters>. See ST_Buffer doc
Last one is probably the most robust solution, but ST_Buffer can be computationally expensive, and assumes you're pulling data in from a PostGIS database.
