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Regional Models

India (IndGG-CUT2021)


  Authors: R. Goyal, et al.     Created: 2021    Resp: R. Goyal  
      Status: PUBLIC    
Description:
The IndGG-CUT2021 is the Indian Gravimetric Geoid model developed using the Curtin University of Technology (CUT) approach, namely Moritz’s analytical solution to Molodensky’s problem, where Molodensky’s G1 term is approximated by terrain correction. The method primarily calculates the quasigeoid model, which was converted to the geoid model by applying the geoid-quasigeoid separation term calculated using Flury and Rummel’s (2009) method. Data used are terrestrial gravity anomalies from GETECH, satellite-altimeter derived marine gravity anomalies, MERIT digital elevation model, EIGEN6C4 and EGM2008 global geopotential models. The Featherstone-Evans-Olliver modified Stokes kernel was used in the calculations with various combinations of modification degree and integration radius. This gravimetric geoid model is for the modification degree of 300 and an integration radius of 1°. The IndGG-CUT2021 extends from 7° N to 37° N latitude and 68° E to 98° E longitude with a grid spacing of 0.02°×0.02°. On validation with the available GNSS/levelling data, mean±STD (in m) for India is -0.15±0.41. However, on cluster-wise validation in the four regions of the country, Uttar Pradesh West, Uttar Pradesh East, Hyderabad, and Bangalore, mean±STD (in m) are -0.57±0.12, -0.48±0.09, 0.11±0.16, and 0.77±0.03, respectively.

References:
R. Goyal, W.E. Featherstone, S.J. Claessens, O. Dikshit, N. Balasubramanian (2021). An experimental Indian gravimetric geoid model using Curtin University’s approach. Terrestrial, Atmospheric and Oceanic Sciences 32, pp. 813-827. DOI: 10.3319/TAO.2021.08.10.02
R. Goyal (2022). Towards a gravimetric geoid model for the mainland India. PhD Thesis. Indian Institute of Technology Kanpur, India and Curtin University, Australia.

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