Can an Earth Gravitational Model Augmented by a Topographic Gravity Field Model Realize the International Height Reference System Accurately?

Abstract In this study, we evaluate the suitability of recent Earth Gravitational Models (EGMs) for realization International Height Reference System (IHRS) in Canada. Topographic gravity field models have been used to augment EGMs spatial resolution reaching 2 ′ (about 4 km), which is comparable regional geoid models. The advantages using an EGM over a approach IHRS are its uniform representation Earth’s and conformance international standards conventions. main challenge access to, best use knowledge topographic data. On one hand, determine that two hybrid (EIGEN-6C4 XGM2019) augmented by signals give geopotential values ( W p ) with accuracy ~0.3 m s −2 , close those estimated Canadian at 11 Frame sites other satellite-only (DIR-R6 GOCO06s) accuracies between 1.5 1.7