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Regional Models

India (IndGG-LSMSA2021)


  Authors: R. Goyal, et al.     Created: 2021    Resp: R. Goyal  
      Status: PUBLIC    
Description:
The IndGG-LSMSA2021 is the Indian Gravimetric Geoid model developed using the Royal Institute of Technology (KTH) method of Least Squares Modification of the Stokes formula with Additive corrections (LSMSA). The method was used to calculate 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, EGM2008 and GO_CONS_GCF_2_DIR_R5 global geopotential models. The LSMSA method was used 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-LSMS2021 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 -0.14±0.43. 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 -0.58±0.13, -0.49±0.10, 0.14±0.16, and 0.79±0.03, respectively.

Reference:
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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