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).