Statistics Act, 1999
R 385
Land Survey Act, 1997 (Act No. 8 of 1997)RegulationsRegulations promulgated in terms of Section 10 of the Land Survey Act, 1997 (Act No. 8 of 1997)5. Limits of allowable error in field work |
The accuracy with which a survey shall be done is expressed by the following formulae, where—
Class A refers to—
| (i) | the determination of reference marks established in terms of regulation 16; and |
| (ii) | such other determinations as may be prescribed in these regulations; |
Class B refers to—
| (i) | the survey of new townships and settlements; |
| (ii) | the resurvey or subdivision of an erf in an existing township or a lot in a settlement; |
| (iii) | the survey for the replacement of a beacon in a township or a settlement; and |
| (iv) | the survey for the preparation of a diagram required under the law relating to the registration of mining titles in respect of precious stones and precious metals; |
Class C refers to all surveys not included in Class A or B, and shall include surveys for mining titles in respect of base minerals—
| (a) | when the position of a point is determined by polars, traverse, triangulation, trilateration, GPS or a combination of these methods, the displacement between any observed ray, measured distance or GPS vector and the equivalent quantity derived from the final co-ordinates of the point fixed shall not exceed— |
for Class A: A metres;
for Class B: 1,5A metres;
for Class C: 3A metres;
where A is equal to—
and S is the distance between the known and the unknown point: Provided that in the case of a GPS vector the comparison is made between the vector derived from the final co-ordinates and the measured vector after the datum transformation has been applied: Provided further that in the case of a traverse the comparison is made to the misclosure of the traverse, where S is the total length of the traverse in metres;
| (b) | when the position of a beacon in a township is checked by the measurement of distances from adjacent beacons, the difference between a single measured distance and the adopted final distance shall not exceed 0,10 metres: Provided that for surveys carried out in terms of the Upgrading of Land Tenure Rights Act, 1991 (Act No 112 of 1991), the Less Formal Townships Act, 1991 (Act No 113 of 1991) and when a permanent physical feature is being fixed as a beacon the difference shall not exceed 0,20 metres; |
| (c) | when the vertical position of a point is determined, the difference between any determination thereof and the finally adopted height shall not exceed 0,10 metres: |
Provided that the Chief Surveyor-General, in consultation with the Surveyors-General, shall determine a standard of accuracy for any survey operation not specified in this regulation.
