The Indian gravimetric geoid model based on the KTH method of Least Squares modification of the Stokes formula with additive corrections: IndGG-LSMSA2021
Cite as:
Goyal, Ropesh; Featherstone, Will E.; Claessens, Sten J.; Dikshit, Onkar; Balasubramanian, Nagarajan (2021): The Indian gravimetric geoid model based on the KTH method of Least Squares modification of the Stokes formula with additive corrections: IndGG-LSMSA2021. V. 1.0. GFZ Data Services. https://doi.org/10.5880/isg.2021.010
Status
I N R E V I E W : Goyal, Ropesh; Featherstone, Will E.; Claessens, Sten J.; Dikshit, Onkar; Balasubramanian, Nagarajan (2021): The Indian gravimetric geoid model based on the KTH method of Least Squares modification of the Stokes formula with additive corrections: IndGG-LSMSA2021. V. 1.0. GFZ Data Services. https://doi.org/10.5880/isg.2021.010
Abstract
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 the method by Flury and Rummel (2009). 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 was obtained with the modification degree of 300 and an integration radius of 1°. The IndGG-LSMSA2021 model extends from 7° N to 37° N latitude and 68° E to 98° E longitude with a grid spacing of 0.02°×0.02° and it is referred to the GRS80 ellipsoid. 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.
The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.
Additional Information
The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).
Authors
Goyal, Ropesh;Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Featherstone, Will E.;School of Earth and Planetary Sciences, Curtin University of Technology, Perth, Australia
Claessens, Sten J.;School of Earth and Planetary Sciences, Curtin University of Technology, Perth, Australia
Dikshit, Onkar;Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Balasubramanian, Nagarajan;Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India
Contact
Goyal, Ropesh; Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India;
ISG Staff; International Service for the Geoid (ISG); ➦
affiliation: Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India
titles
title: The Indian gravimetric geoid model based on the KTH method of Least Squares modification of the Stokes formula with additive corrections: IndGG-LSMSA2021
publisher: GFZ Data Services
publicationYear: 2021
subjects
subject: Geodesy
subject: Geoid model
subject: ISG
subject: KTH method
subject: Least Squares modification of Stokes integral with additive corrections
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The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.
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;Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India
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