The data, methodology, and the resulting accurate gravimetric geoid model in the Korean Peninsula (latitude 32˚ to 40˚ and longitude 124˚ to 131˚) are presented in this study.
The types of used data were a high degree geopotential model (the EGM96...
The data, methodology, and the resulting accurate gravimetric geoid model in the Korean Peninsula (latitude 32˚ to 40˚ and longitude 124˚ to 131˚) are presented in this study.
The types of used data were a high degree geopotential model (the EGM96 spherical harmonic coefficient set), a set of 12,615 land gravity observations, 1,056,075 shipborne gravity observations, and KMS2002 gravity anomalies from satellite altimetry.
The remove and restore technique was successfully applied to combining the above mentioned data sets using up to degree and order 112 of the EGM96 coefficient. The residual geoid was calculated with residual free-air anomaly values using the spherical Stokes' formula with a 37-km integration cap radius.
The geoid model was referred to WGS84 geodetic system and was tested using a set of GPS/levelling geoid undulations. The absolute and relative accuracies are 0.132 m and 1.02 ppm, respectively, and some improvement compared to the PNU95 geoid model was found. Although neither serious theories nor new techniques have been developed in this study, the combination of a better geopotential model, expanded land gravity data, added shipborne gravity data, and gravity anomalies from improved altimetry has improved the new geoid model by parts. In addition to data expansion, careful data processing procedures with high resolution topography data have improved the new geoid model by parts.