Given a polygon in a PostGIS database, what is the best way to create a graph of its distribution over a range of latitudes? I'm picturing a graph of a curve, where the proportion of the total area under the curve that lies between two points on the x-axis (latitude) represents the proportion of the polygon's area between those latitudes. The tools I have at my disposal are PostGIS and R. It seems like this should be a fairly routine exercise for which there are well established approaches that I simply haven't been able to find.
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