conic.parallels([parallels]) The two
d3.geoConicEquidistant() d3.geoConicEquidistantRaw(phi0, phi1)
path.centroid(object) Returns the projected planar centroid (typically in pixels) for the specified GeoJSON object
d3.geoOrthographic() d3.geoOrthographicRaw
projection.precision([precision]) If precision is specified, sets the threshold for the projection’s
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