Geodetic Activities in Indonesia

Abstract

Primary triangulation network of Jawa was started in 1862 and completed in 1880. This network was computed in a system which was called Genuk System. This network was extended to Sumatera and Nusa Tenggara Isles and the computation in the Genuk System for those area was started in 1931. Beside this system there were two other systems, Malayan System for Bangka, Riau & Lingga and Serindung System for West Kalimantan. A unified datum was established after a Doppler satellite observation held in Padang, and the datum was called the Indonesian Datum 1974 (ID-1974). Determination of geoid in the Indonesian Archipelago was worked out by combining a global detailed gravimetric geoid computed by March & Chang (1976) and the oceanic geoid derived from GEOS-3 altimetry data (Rapp, 1979). A new precise leveling network in Jawa has been designed and measured since 1980. The measurements of this network will be completed in 1985, so that the measurements may be continued to Sumatera. Principal gravity base stations were established through a joint working between the Geological Survey of Indonesia and the University of New England, Australia.