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NGGM and MAGIC science impact on geodesy is foreseen on the contribution(s) to improved gravity and geoid models to mass variations, physical height temporal changes and geoid modeling in both static and time-variable sense and importantly to the realization of the IHRF and its evolution with time. NGGM/MAGIC science impact on geodesy could be understood as answering following questions:
What is the current state of the art and the shortcomings in IHRF potential determination and the estimation of potential rates with time?
How will NGGM and MAGIC contribute to height system unification at a global level by improving the spatial resolution and accuracy of global geopotential models?
How will NGGM and MAGIC contribute to the practical realization of the IHRS/IHRF by improving the estimation of potential values at IHRF sites worldwide?
How will NGGM and MAGIC contribute to the determination of potential, physical and geometric height changes with time at the requested by the IHRF conventions 0.1 m2s-2 and 1 cm level accuracy, respectively?
How will NGGM and MAGIC contribute to Precise Orbit Determination (POD) of Low Earth Orbiters?
The main tasks foreseen for the impact assessment on geodesy are:
Geoid and gravity field modeling in terms of the static and time-variable component
Impact on IHRF realization regarding geoid, physical heights, and potential determination and national geodetic control networks for height system unification.
Impact on the time evolution of the IHRF in terms of the geoid, physical heights, and potential rates.
Topographic masses and subsurface mass variations.
Geopotential models from NGGM/MAGIC and impact on POD
Impact on POD, in terms of orbit and inter-satellite ranging residuals.
Impact on orbit prediction, emphasizing the radial component of altimetry missions.
Spectral validation of NGGM/MAGIC gravity models through a degree-wise cumulative orbit determination.
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