SegmentGeoPoint

Describes the geographic point on the segment and the direction of the segment. The route geometry is a sequence of points that form segments in pairs. At that, all functions working with route geometry consider that the first point of the pair forming the segment is included in this segment, and the second point is not: [point_1, point_2),[point_2, point_3),...,[point_n-1, point_n)[point_last]. The last point forms a segment of zero length with itself. Thus, each point of the route belongs to exactly one segment. The direction of the point_last point is undefined.