geo_cluster_kmeans geo_collect_garray geo_makeline_garray geo_npoints geom_array_union geom_boundary geom_buffer geom_centroid geom_convex_hull geom_difference2d geom_intersection2d geom_shortestline2d geom_shortestline3d geom_unary_union line_interpolate_point line_locate_point line_substring

line_locate_point() double line_locate_point ( const GSERIALIZED *  gs1, const GSERIALIZED *  gs2  ) Locate a point into a line. Parameters [in] gs1 Line [in] gs2 Point Returns On error return -1.0