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Abstract
The development of real time kinematic Global Positioning System (GPS) technology has provided the surveying community with a potentially powerful tool for performing cadastral surveys. The Victorian Surveyors (Cadastral Surveys) Regulations 1995 prescribe a length accuracy of ±(10mm+60ppm) for all measured and determined lengths. The aim of this paper is to assess the ability of real time kinematic GPS techniques to meet this legislative requirement.
A statistical analysis of the results of seven real time GPS kinematic surveys and a high precision traverse is presented. The variance of a determined length using GPS is derived and found to be a function of the length of the two GPS baselines used to determine each end of the line. Based on this theory, it is shown that the length based tolerance is restrictive for the use of GPS. A positional tolerance is demonstrated to be more relevant and a tolerance of 25mm claimed to be realistic for real time GPS techniques and equipment.