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

2019 ◽  
Vol 5 (1) ◽  
pp. 114-137
Author(s):  
António Alves Teixeira De Carvalho
Keyword(s):  
Geodetic System

A atividade geodésica experimenta uma transformação significativa com o surgimento dos sistemas de posicionamento por observações de Satélites Artificiais Terrestres (SAT). A sua capacidade atual permite a determinação com alta precisão, da posição de qualquer objeto sobre a superfície da terra, aliada à rapidez e comodidade, superando os métodos clássicos em muitos aspetos. Com a adoção do sistema WGS 84 (World Geodetic System), os documentos cartográficos, em uso atualmente e produzidos com base no sistema Clark 1880 que é um sistema topocêntrico, terão de ser transformados ou adequados ao novo referencial geocêntrico. No presente artigo fez-se ênfase na determinação dos parâmetros de transformação na Província de Luanda. Os procedimentos metodológicos seguidos fundamentam-se na pesquisa descritiva, onde se destaca o método dedutivo, com base nos resultados obtidos através dos dados coletados. Neste contexto foram utilizados 8 pontos da Rede Geodésica de Angola (RGA), com coordenadas retangulares, referenciados no elipsoide Clark 1880 e WGS 84. Solucionado o sistema de equações normais, foram estimados os quatro parâmetros de transformação de Luanda (ΔX= -195.9722 metros; ΔY= + 53.8010 metros; γ = 1.5708 arcseg; m = 0.9999), pelo método dos mínimos quadrados. A avaliação dos resultados foi feita pela comparação das diferenças entre as coordenadas estimadas pelo ajustamento e os valores de referência, isto é, os valores conhecidos. Os resultados demonstraram que o modelo se apresenta apropriado para a transformação de bases cartográficas, sobretudo às de escalas iguais ou menores que 1:5000.

Establishment of local coordinate systems in the transition to the geodetic system of coordinates of GSK-2011

2017 ◽  
Vol 929 (11) ◽  
pp. 2-10
Author(s):  
A.V. Vinogradov
Keyword(s):  
Coordinate System ◽  
Small Businesses ◽  
Transition Period ◽  
Local Coordinate System ◽  
Initial Point ◽  
Central Meridian ◽  
Administrative District ◽  
Local Networks ◽  
Small Areas ◽  
Geodetic System

Pretty before long there will be transition to the geodetic system of coordinates of GSK-2011. For the transition period it is necessary to develop a method of recalculating coordinates from one system to another. The existing methods of recalculating coordinates are designed for recalculating coordinate points of state geodetic networks (GGS) and geodetic local networks (GSS). For small areas (administrative districts, populated areas) simplified methods are more acceptable. You need to choose the resampling methods that can be applied in small businesses, performing surveying works. The article presents the the results of calculations of changes of coordinates of the same point in GSK-2011 and SC-95 in six-degree zones of Gauss projection. It was found that in each region values of the shifts changed to small ones. Therefore, it is possible to convert the coordinates of the points by the simplified formulae. For recalculation from the coordinates of GSK-2011 in SK-95 or local coordinate system (WCS) of the administrative district it is necessary to find the origin of coordinates, scale value and rotation of the coordinate axes. The error of the conversion shall not exceed 0,001 m. The coordinates of the initial point of the local coordinate system relative to the central meridian of the local coordinate system shall be added in the list of parameters of the transition from local coordinate system to the state one.

scholarly journals Volcanoes Denominations

2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Eaed Mohamad Al-Momani
Keyword(s):  
The Other ◽  
Natural Phenomena ◽  
Geodetic System ◽  
Geological Processes ◽  
The Earth ◽  
Other Hand ◽  
The World ◽  
Analyze Data

This study highlights the denominations used for currently dormant volcanoes, as well as the names used for some of them in the Hashemite Kingdom of Jordan as a case study. This study also explains the nature of these volcanoes natural phenomena playing a major role in most geological processes contributing in the formation and development of the earth crust. On the other hand, this study has focused on identifying and analyzing some currently dormant volcanoes sites and their extension to the surface. This study used computerized programs, such as the World Geodetic System (WGS84), as well as the (ERDASIMAGINE) system to determine the volcanic sites in order to collect and analyze data. It has reached a few findings and recommendations regarding the denomination of volcanoes, the population’s safety guarantee, the resources of such areas, as well preserving the country’s landmarks

The Department of Defense World Geodetic System 1972

1974 ◽  
Vol 28 (5) ◽  
pp. 496-506 ◽  
Author(s):  
Thomas O. Seppelin
Keyword(s):  
Department Of Defense ◽  
Scientific Community ◽  
Large Scale ◽  
Developmental Cycle ◽  
Data Input ◽  
Normal Matrices ◽  
Geodetic System ◽  
Method Of Solution ◽  
Scale Matrix ◽  
Major Data

An improved world geodetic system has been developed to satisfy the mapping, charting, and geodetic needs of the Department of Defense. The system, designated WGS 72, represents the culmination of approximately five years of data collection within the Department of Defense and the scientific community. Principal agencies involved in the developmental cycle include the USAF, Defense Mapping Agency, US Naval Weapons Laboratory, and Naval Oceanographic Office. The method of solution for an adjustment of this magnitude is characterized by the formation of a large-scale matrix by combining normal matrices from each of the major data input sets. The scaling and weighting processes for the final matrix are discussed. The resultant ellipsoid parameters, datum shifts and their related accuracies are presented and compared against similar quantities in other recent geocentric systems.

scholarly journals Preliminary evaluation of Doppler-determined pole positions computed using World Geodetic System 1984

1988 ◽  
Vol 128 ◽  
pp. 131-140
Author(s):  
John A. Bangert ◽  
James P. Cunningham
Keyword(s):  
Orbit Determination ◽  
Satellite Orbit ◽  
Satellite System ◽  
Pole Position ◽  
Preliminary Evaluation ◽  
Geodetic System ◽  
Determination Process ◽  
The World ◽  
Gravitational Model ◽  
Terrestrial Reference System

Since 1975, the Defense Mapping Agency (DMA) has been determining polar motion as a byproduct of computing the precise orbits of the Navy Navigation Satellite System (NNSS) satellites. The orbit determination process currently incorporates the NSWC 9Z2 terrestrial reference system and the NWL 10E-1 Earth Gravitational Model (EGM) to degree 28 and order 27. The World Geodetic System 1984 (WGS 84), developed by DMA, will replace the NSWC 9Z2/10E-1 system for NNSS orbit determination. The WGS 84 EGM to degree and order 41 will be utilized. This paper presents the results of two experiments which compared pole positions computed in the two systems. These comparisons indicate that use of WGS 84 improves agreement between pole position values resulting from the Nova-class satellite orbit solutions and the values determined by other modern techniques.

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