If the division of land creates four or less parcels, the final parcel map may be compiled from recorded or filed data when survey information exists on recorded or filed maps to sufficiently locate and retrace the exterior boundary lines of the final parcel map and when the location of at least one of these boundary lines can be established from an existing monumented line. In all other cases, the final parcel map shall be based on a field survey of the land conducted in accordance with the Land Surveyor's Act of the state of California. All new lot corners shall be monumented and based on a field survey. (Ord. 2017-01 § 1 (part), 2017: prior code § 9270)