A combined regional Geopotential Model using optimized global Gravity Field Solutions

Abstract To develop a gravimetric geoid, Global Geopotential Model (GGM) is required to minimise the truncation error arising from using Stokes integral with limited number of gravity data points. The choice best-fitting GGM determines accuracy geoid solution. Selecting suitable rigorous process, requiring both internal and external evaluation all GGMs available at International Center for Globa Earth Models (ICGEM). Moreover, perform differently depending on wavelength, it difficult obtain that performs best across full harmonic spectrum. In this study, combined developed selection most recent high-resolution covering Peninsular Malaysia. selected models are first synthesized harmonically undulations collocated GNSS-levelled points, free air anomalies randomly sampled points study area. These quantities compared observed point interpolated grid anomalies. performing then used produce GGM, by selecting spherical coefficients characteristics every degree. signal spectra new geopotential models. produced higher cumulative noise ratio (SNR) 4402.669 GGMs, XGM2016 Eigen-6C following suit SNR 4139.561 4092.462, respectively. Besides, performed better whole spectrum than GGMs. use in modelling, instead single may be more desirable because they can improve quality results.