S2CapFromAxisHeight     Construct a S2Cap using axis and height
S2Cap_Contains          Test of Containment in S2Cap
S2Cap_GetRectBound      Bounding latitude and longitude rectangle for
                        spherical cap
S2Cap_area              Area of s2cap
S2Cell                  Make a list of S2Cells
S2CellIdFromPoint       Make a Vector of S2CellIds From Points on the
                        Sphere
S2CellId_ToPoint        Convert S2CellId to a S2Point
S2CellId_ToString       Make a vector of S2CellId strings
S2Covering              Approximate a Region on the Sphere by a
                        Covering of S2Cells
S2LatLngRect            Create a rectangle of latitude and longitude on
                        the sphere
S2LatLngRect_area       Area of s2latlngrect
S2Point_interpolate     Interpolation of points on unit sphere
S2Polygon               Construct a S2Polygon
S2Polygon_Contains      Test of Containment in S2Polygon
S2Polygon_union         Union and intersection of two s2polygons
S2Polygons_area         compute areas for a list of s2polygons
S2Polygons_centroid     compute centroids for a list of s2polygons
S2Polygons_intersect    for two sets of s2polygons, which ones
                        intersect?
S2Polygons_intersection
                        intersection of sets of s2polygons
S2Polyline_dist         Distance from points to line on sphere
s2-package              s2: Google's S2 Library for Geometry on the
                        Sphere
