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(1) abstract geometry; (2) storing geographic data in projected coordinates; (3) a generic ESRI term for vector features; a class for "geometry" objects.

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Calculating a spherical polygon centroid

For anyone passing by all this time later, there's a good solution posted on https://stackoverflow.com/questions/19897187#answer-38201499 giving the centre as Σ[a×b / |a×b| ⋅ θab/2] for each pair of c …
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