Returns the center of the cell in (u,v) coordinates (see s2coords.h).
Note that the center of the cell is defined as the point at which it is
recursively subdivided into four children; in general, it is not at the
midpoint of the (u,v) rectangle covered by the cell.
Returns the center of the cell in (u,v) coordinates (see s2coords.h). Note that the center of the cell is defined as the point at which it is recursively subdivided into four children; in general, it is not at the midpoint of the (u,v) rectangle covered by the cell.