Proposta dos parâmetros de transformação de coordenadas rectangulares da província de Luanda do elipsoide de Clark 1880 para o WGS 84

The geodetic activity in Angola has seen a tremendous advancement with the advent of global positioning systems via Artificial Earth Satellites (AES). The capacity of such systems permits users to locate with high degree of accuracy any object on the surface of the ground. Such ability coupled with...

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Bibliographic Details
Main Author: Teixeira De Carvalho, António Alves
Format: Article
Language:Portuguese
Published: 2019
Subjects:
Clark 1880
Datum
Ellipsoid
Parameters
WGS 84
Datos
Elipsóide
Parámetros
WGS84
Online Access:https://dialnet.unirioja.es/servlet/oaiart?codigo=7052368
Source:SAPIENTIAE, ISSN 2183-5063, Vol. 5, Nº. 1, 2019 (Ejemplar dedicado a: JULHO-DEZEMBRO 2019), pags. 114-137
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Proposta dos parâmetros de transformação de coordenadas rectangulares da província de Luanda do elipsoide de Clark 1880 para o WGS 84
Summary: The geodetic activity in Angola has seen a tremendous advancement with the advent of global positioning systems via Artificial Earth Satellites (AES). The capacity of such systems permits users to locate with high degree of accuracy any object on the surface of the ground. Such ability coupled with its speed of execution and availability makes AES a far superior methods of observation than its predecessors. However, the adoption of the World Geodetic System (WGS 84) creates a need to update the cartographic literature currently in use, from the Ellipsoid Clark 1880 system, a topocentric system, to the WGS 84 System, a geocentric system. The present article intends to use the transformation conforme to the determination of the transformation parameters in the Province of Luanda. The methodology used for this project is fundamentally based on, as far as its procedures, a descriptive research where the deductive scientific method used is based on the results obtained from the data gathered. The results are thereafter presented in statistical form. This study utilizes 8 points from the Geodetic Network of Angola (GNA) and rectangular coordinates referenced from Ellipsoid Clark 1880 and WGS 84. Solved the system of normal equations, were estimated four parameters of conversion of Luanda (ΔX= -195.9722 metros; ΔY= + 53.8010 metros; γ = 1.5708 arcseg; m = 0.9999), based on the method of minimum squares. To evaluate the results, a comparison was made between the differences in coordinates estimated by the adjustment and any known reference values. The results demonstrate that the model is appropriate for the conversion of cartographic bases with a scale equal or smaller than 1:5000.

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