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simplified borders

We use topojson.borders() (a proposed extension of topojson.mesh()) to extract borders arcs; then we manipulate the borders childishly (outrageously? — it makes some countries vanish!) by keeping only the first and last point of each arc.

Research by Philippe Rivière for topojson issue #17.

forked from mbostock's block: World Map

forked from Fil's block: topojson borders

forked from Fil's block: simplified borders