Topographical features

(1) Topographical features fixed by survey shall be plotted from the measurements. (2) Topographical information may be taken from any official map published by the Commissioner of Lands and Surveys or any authority approved by the Commissioner of Lands and Surveys with due caution in regard to the limitations enjoined by the scale of the map. (3) Where topographical information is taken from aerial photographs, the source shall be shown on the plan.