EVALUASI DAN KOMPARASI DARI MODEL ANOMALI GAYA BERAT di LAUTAN INDONESIA

 Zulfikar Adlan Nadzir, Nina Rahmadhani

Abstract


Gravity is the total value of the various forces acting on any stationary body on the Earth's surface. This gravity is related to the Geoid, an important parameter in Geodesy. The Geoid is commonly used as a vertical reference for geospatial reference systems in many countries, including Indonesia. Another derived parameter of gravity is gravity anomaly, which is the difference between the gravity vector on the geoid and the normal gravity vector on the ellipsoid. The measurement of gravity at sea has several disadvantages compared to that on land, due to the high level of difficulty and risk of the measurement. Technological developments have facilitated the observation of gravity at sea both regionally and globally, one of which is using altimetry. The output of gravity observations using altimetry satellites is called combined Global Geopotential Model (GGM). Indonesia has had a regional geoid model since 1981, and the latest is INAGEOID2020 v2.0. The accuracy of INAGEOID2020 needs to be improved to realize the one-map policy and large-scale mapping based on the Master Plan for the Implementation of the National Vertical Geospatial Reference System. Therefore, this research aims to analyze the comparison of gravity anomalies of several MGGs in Indonesian seas by comparing them to Shipborne gravity anomalies. The Global Geopotential Models used are EGM2008, EIGEN6C4, XGM2019e, DTU17 and Sandwell Model v.31.1. The results of this study are XGM2019e is the best Combination Global Model in Indonesia and DTU17 is the best Global Altimetry Model in Indonesia, and both models have good performance in various sea conditions in Indonesia.

Keywords


Gravity anomaly; Global Geopotential Model; XGM2019e; DTU17; Altimetry

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DOI: http://dx.doi.org/10.31314/jsig.v7i2.3073

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