| decode | Decode a flexible polyline encoded string | 
| decode_sf | Wrapper function for decoding to simple features | 
| encode | Encode a line in the flexible polyline encoding format | 
| encode_sf | Wrapper function for encoding simple features | 
| get_third_dimension | Get third dimension of a flexible polyline encoded string | 
| set_third_dimension | Set third dimension of a flexible polyline encoded string |