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_substring() static POINTARRAY * geography_substring ( POINTARRAY *  ipa, double  from, double  to, double  tolerance  ) static Return the part of a line between two fractional locations.