geography_closestpoint geography_interpolate_points geography_line_interpolate_point geography_line_locate_point geography_line_substring geography_shortestline geography_substring geography_tree_closestpoint ptarray_length_sphere ptarray_locate_point_spheroid

geography_line_interpolate_point() Datum geography_line_interpolate_point ( PG_FUNCTION_ARGS  ) Interpolate a point along a geographic line.