TS 14 – Positioning and Measurement – GNSS Applications

GPS surveying has started to be use for cadastre surveys in Malaysia. In 1999, the Department of Survey and Mapping Malaysia (DSMM) has issued Guidelines for the use of GPS for cadastre control and cadastre surveys (KPU Circular 6-1999). This guideline covers the use of GPS static and rapid static surveys only. At present, the use of GPS-RTK for cadastre surveys is still under study. This paper discusses experiences obtained using GPS-RTK in conducting cadastre surveys on several different ground conditions. Two aspects were studied, firstly, the observation conditions/surrounding, secondly, the computation datum used. In cases where sky obstructions were high, GPS-RTK was found to have some problems, hence offset method was employed to overcome the problem. Traverse computations using Cassini coordinate obtained directly from the GPS-RTK observation were compared with that derived from the Cassini published coordinate. Results have shown that comparable accuracy in values of bearings and distances have been achieved, with which refixation work was successfully done. These experiences hence convinced the suitability of GPS-RTK for cadastre surveys