26Checking accuracy of measurements and calculations

26 Checking accuracy of measurements and calculations

26 Checking accuracy of measurements and calculations

(1) A surveyor must check all measurements by closure of the eastings and northings of the lines in all surrounds, measured in metres to 3 decimal places.

(2) The closure of a survey, and of each parcel of land surveyed, must be done so that the length of the misclose vector is not more than 15mm + 100 parts per million of the perimeter.

(3) If the complete dimensions of a partially compiled parcel of land are shown in the survey plan—

(a) a surveyor must check the dimensions by calculating the closure of the parcel, and

(b) the calculation must be done so that the length of the misclose vector is not more than the relevant amount specified in the table to this subsection—

| Year of survey | Maximum length of misclose vector for level or undulating terrain | Maximum length of misclose vector for steep or mountainous terrain | | 1788 to 1862 | 1,000 ppm | 2,000 ppm | | 1862 to 1975 | 500 ppm | 1,320 ppm | | 1975 to 2001 | 500 ppm | 1,000 ppm | | 2001 to present | 60mm + 400 ppm | 60mm + 400 ppm |

(4) A misclose vector must be determined using the following formula—

where—

a represents the misclose in eastings.

b represents the misclose in northings.

(5) A surveyor must check all computations and transformations used to prepare a survey plan for accuracy.