projection.stream(stream) Returns a projection stream for

path.projection([projection]) If a projection is specified, sets the current projection to the specified projection

rotation(point) Returns a new array [longitude, latitude] in degrees representing the rotated point of the

path.bounds(object) Returns the projected planar bounding box (typically in pixels) for the specified GeoJSON object

identity.reflectX([reflect]) If reflect is specified, sets whether or not the x-dimension is reflected

stream.polygonEnd() Indicates the end of a polygon.

path.pointRadius([radius]) If radius is specified, sets the radius used to display Point and MultiPoint features

identity.reflectY([reflect]) If reflect is specified, sets whether or not the y-dimension is reflected

d3.geoArea(feature) Returns the spherical area of the specified GeoJSON feature in

d3.geoInterpolate(a, b) Returns an interpolator function given two points a and b. Each point must