λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines)
In this paper, we present a new reference model that approximates the actual shape of the Earth, based on the concept of the deformed spheres with the deformation parameter λ. These surfaces, which are called λ-spheres, were introduced in another setting by Faridi and Schucking as an alternative to...
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ftmdpi:oai:mdpi.com:/2227-7390/10/18/3356/ 2023-08-20T04:09:52+02:00 λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines) Vasyl Kovalchuk Ivaïlo M. Mladenov 2022-09-15 application/pdf https://doi.org/10.3390/math10183356 EN eng Multidisciplinary Digital Publishing Institute Mathematical Physics https://dx.doi.org/10.3390/math10183356 https://creativecommons.org/licenses/by/4.0/ Mathematics; Volume 10; Issue 18; Pages: 3356 deformed spheres incomplete elliptic integrals geoid’s reference models loxodromes or rhumb lines azimuths and arc lengths geodesy and navigation problems Text 2022 ftmdpi https://doi.org/10.3390/math10183356 2023-08-01T06:29:26Z In this paper, we present a new reference model that approximates the actual shape of the Earth, based on the concept of the deformed spheres with the deformation parameter λ. These surfaces, which are called λ-spheres, were introduced in another setting by Faridi and Schucking as an alternative to the spheroids (i.e., ellipsoids of revolution). Using their explicit parametrizations that we have derived in our previous papers, here we have defined the corresponding isothermal (conformal) coordinates as well as obtained and solved the differential equation describing the loxodromes (or rhumb lines) on such surfaces. Next, the direct and inverse problems for loxodromes have been formulated and the explicit solutions for azimuths and arc lengths have been presented. Using these explicit solutions, we have assessed the value of the deformation parameter λ for our reference model on the basis of the values for the semi-major axis of the Earth a and the quarter-meridian mp (i.e., the distance between the Equator and the North or South Pole) for the current best ellipsoidal reference model for the geoid, i.e., WGS 84 (World Geodetic System 1984). The latter is designed for use as the reference system for the GPS (Global Positioning System). Finally, we have compared the results obtained with the use of the newly proposed reference model for the geoid with the corresponding results for the ellipsoidal (WGS 84) and spherical reference models used in the literature. Text South pole MDPI Open Access Publishing South Pole Mathematics 10 18 3356 |
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English |
topic |
deformed spheres incomplete elliptic integrals geoid’s reference models loxodromes or rhumb lines azimuths and arc lengths geodesy and navigation problems |
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deformed spheres incomplete elliptic integrals geoid’s reference models loxodromes or rhumb lines azimuths and arc lengths geodesy and navigation problems Vasyl Kovalchuk Ivaïlo M. Mladenov λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines) |
topic_facet |
deformed spheres incomplete elliptic integrals geoid’s reference models loxodromes or rhumb lines azimuths and arc lengths geodesy and navigation problems |
description |
In this paper, we present a new reference model that approximates the actual shape of the Earth, based on the concept of the deformed spheres with the deformation parameter λ. These surfaces, which are called λ-spheres, were introduced in another setting by Faridi and Schucking as an alternative to the spheroids (i.e., ellipsoids of revolution). Using their explicit parametrizations that we have derived in our previous papers, here we have defined the corresponding isothermal (conformal) coordinates as well as obtained and solved the differential equation describing the loxodromes (or rhumb lines) on such surfaces. Next, the direct and inverse problems for loxodromes have been formulated and the explicit solutions for azimuths and arc lengths have been presented. Using these explicit solutions, we have assessed the value of the deformation parameter λ for our reference model on the basis of the values for the semi-major axis of the Earth a and the quarter-meridian mp (i.e., the distance between the Equator and the North or South Pole) for the current best ellipsoidal reference model for the geoid, i.e., WGS 84 (World Geodetic System 1984). The latter is designed for use as the reference system for the GPS (Global Positioning System). Finally, we have compared the results obtained with the use of the newly proposed reference model for the geoid with the corresponding results for the ellipsoidal (WGS 84) and spherical reference models used in the literature. |
format |
Text |
author |
Vasyl Kovalchuk Ivaïlo M. Mladenov |
author_facet |
Vasyl Kovalchuk Ivaïlo M. Mladenov |
author_sort |
Vasyl Kovalchuk |
title |
λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines) |
title_short |
λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines) |
title_full |
λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines) |
title_fullStr |
λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines) |
title_full_unstemmed |
λ-Spheres as a New Reference Model for Geoid: Explicit Solutions of the Direct and Inverse Problems for Loxodromes (Rhumb Lines) |
title_sort |
λ-spheres as a new reference model for geoid: explicit solutions of the direct and inverse problems for loxodromes (rhumb lines) |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/math10183356 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
Mathematics; Volume 10; Issue 18; Pages: 3356 |
op_relation |
Mathematical Physics https://dx.doi.org/10.3390/math10183356 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/math10183356 |
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Mathematics |
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10 |
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18 |
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3356 |
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