Checking accuracy of measurements and calculations
26 Checking accuracy of measurements and calculations
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.
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.
If the complete dimensions of a partially compiled parcel of land are shown in the survey plan—
a surveyor must check the dimensions by calculating the closure of the parcel, and
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
A misclose vector must be determined using the following formula—
where—
a represents the misclose in eastings.
b represents the misclose in northings.
A surveyor must check all computations and transformations used to prepare a survey plan for accuracy.
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