I've been meaing to get back to quads by latitude and chunks... Here I have a pretty standard oval, mostly because I have been on a word wrap to world div kick. In any case, I want to chunk up my world oval by bands of latitude and then subdivide those lattitude quads. I start with a circumference for world size, width and height.
43900 km across, 439px by 220px with a total surface area of 613.44 m. km^2
25790.624839103577, 13344.957878214484
polygon(439px 73.16666666666667px, 365.8333333333333px 0px,292.6666666666667px 73.16666666666667px, 220px 0px, 0px 73.16666666666667px)
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