graticule.stepMinor([step]) If step is specified, sets the minor step for this graticule. If step

d3.geoConicEquidistant() d3.geoConicEquidistantRaw(phi0, phi1)

path.area(object) Returns the projected planar area (typically in square pixels) for the specified GeoJSON object

circle.radius([radius]) If radius is specified, sets the circle radius to the specified angle in degrees, and

path.centroid(object) Returns the projected planar centroid (typically in pixels) for the specified GeoJSON object