Subject to any general or particular directions issued by the adjudication officer, the duties of the survey officer shall be—
(a) to carry out such survey work as may be required in the execution of the adjudication process; and
(b) to prepare or cause to be prepared a demarcation index map of the adjudication section which shall be compiled from survey data or aerial photographs showing each parcel of land identified by a distinguishing number, except that public roads shall not be required to be identified by a number.