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High-resolution regional gravity field modeling to connect the local vertical systems in South America to the IHRF

Abstract Since 2015, the scientific community has been working on unifying the global vertical system, following the resolution for the definition and realization of an International Height Reference System. This paper aims to determine the vertical datum parameter between the local vertical system and the global one in seven countries (Argentina, Brazil, Chile, Colombia, Ecuador, Venezuela, and Uruguay) in South America. For this purpose, Global Navigation Satellite System/leveling data and geoid undulations from a regional gravity field model were used in the computation. The results showed that the vertical datum parameter varies from 0.29 m (Talcahuano tide gauge—Chile) to 1.69 m (Santana tide gauge—Brazil). Besides that, geopotential numbers were estimated using the regional gravity field model computed in this paper …

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