Note: this guideline is issued by the Surveyor-General under section 7(1)(ga) of the Cadastral Survey Act 2002 about the Rules for Cadastral Survey 2010 and is not legally binding.

The following information relates to rule 5.3 and calculating the area of a parcel, including where accretion or erosion has occurred, and when dealing with marginal strips.

Calculating the area of a parcel

The area of a primary parcel relates to the parcel's horizontal extent.  Where a parcel shape changes at different elevations, the area of the parcel must be calculated from the widest extent of the parcel when vertically projected onto a horizontal plane, eg the vertical shadow or bird's-eye view from directly above [r 5.3(b)].  This principle applies in all cases, including parcels that are in airspace or underground, or are made up of various floors of different heights, such as stratum parcels (see Figure 1below).

The area of a parcel must be correctly calculated from the boundary information defining the boundary [r 5.3(c)(i)] and be expressed in hectares [r 8.3.2(c)]

Note that there is no requirement to calculate the sum of areas for all primary parcels depicted in a CSD. The sum of stratum parcel areas will generally exceed the area of the extinguished parcel due to overlaps.

Diagram showing area of parcel
Figure 1: Area of parcel

Area for accretion

An area must be provided for portions of land claimed as accretion [r 5.3(a)(iii)].

Where the accreted land is depicted in a Diagram of Survey [r 9.6.3(e)] or in a Diagram of Parcels [r 10.4.2(d)(iv)], this land must be clearly incorporated in the associated primary parcel being updated.

The area of the updated primary parcel must include the area of accretion. 

Diagram showing areas for parcel that includes accretion
Figure 2: Areas for parcel that includes accretion

Area for erosion

Although the Rules require the depiction of land that has eroded [r 9.6.3(h)(iii)], they do not require an area for the erosion.

Area must not be shown for movable marginal strip

An area must not be shown for a movable marginal strip where the strip is depicted in a Diagram of Parcels [r 10.4.2(d)(iv)].

The area of the movable marginal strip is included in its associated primary parcel.

Last Updated: 7 April 2017
Authority: Surveyor-General - Section 7(1)(ga) of the Cadastral Survey Act 2002
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