Return the SRID of top-level authority, or None if undefined.
(self)
| 207 | |
| 208 | @property |
| 209 | def srid(self): |
| 210 | "Return the SRID of top-level authority, or None if undefined." |
| 211 | try: |
| 212 | return int(self.auth_code(target=None)) |
| 213 | except (TypeError, ValueError): |
| 214 | return None |
| 215 | |
| 216 | # #### Unit Properties #### |
| 217 | @property |