An Assessment of GPS Heighting from MyRTKnet and MyGEOID Compared To Conventional Levelling

Global Positioning System (GPS) technology introduced in Malaysia in year 1989 has changed the scenario of surveying rapidly. The existing GPS infrastructure in Malaysia mainly served as a ground control station for mapping purposes. Malaysia Real Time Kinetic Network (MyRTKnet) is a new nation-wide GPS network and system infrastructure developed for GPS users to provide RTK services for positioning application across the country. MyGeoid is the Malaysia version of geoid separation (N) model, meant to complement and strengthen the existing geodetic infrastructure for Malaysia. Even though the use of GPS has gained popularity amongst Malaysian surveyors, the accuracy in GPS heighting is currently overshadowed by conventional levelling. This study mainly focus on accessing the accuracy of GPS levelling using MyRTKnet and MyGeoid established by JUPEM as compared to conventional levelling. Analysis of the results showed that the accuracy of height determination is consistent with JUPEM circulation on MyRTKnet (KPUP 9/2005) and MyGeoid (KPUP 1 0/2005)