Orthometric Height Determination on Bali Island using the Geopotential Number Approach
Dina Anggreni Sarsito (a*), Brian Bramanto (a), Dhota Pradipta (a), Heri Andreas (a) and Sidik Triwibowo (b)

(a) Geodesy Research Group - Institut Teknologi Bandung, Labtek IXC 4th flr Ganesa 10 Bandung 40132, Indonesia
*dina.sarsito[at]gmail.com
(b) Indonesian Geospatial Information Agency, Jakarta - Bogor KM. 46, Kabupaten Bogor 16911, Indonesia

Abstract

Orthometric height is a type of physical height used by Indonesia in national or local reference systems for positioning that is used in various scientific and engineering activities. The main obstacle in determining the orthometric height is theoretically having to measure gravity measurement along the plumb line connecting the topography equipotential surface to the geoid surface where practically very difficult to realize. Another constraint is that it requires precise leveling measurements from the main point which is usually located on the coast to land far from the coast. This paper studies the possibility of estimating orthometric height values at several GNSS GPS stations in Bali using the geopotential number approach. The results obtained indicate the possibility of orthometric height determination in the Bali region without direct gravity measurements and precise leveling measurements.

Keywords: Orthometric- Geopotential Number- Geoid- Gravity- Bali

Topic: Solid Earth Sciences