Results 161 to 170 of about 1,287 (187)

Long-Term Stability of the SIRGAS Reference Frame and Episodic Station Movements Caused by the Seismic Activity in the SIRGAS Region

2012
The western part of the SIRGAS region is an extremely active seismic area because it is located in the plate boundary zone of six tectonic plates, namely the Pacific, Cocos, Nazca, North American, Caribbean, and South American plates. The frequent occurrence of earthquakes causes episodic station movements, which affect the long-term stability of the ...
L. Sánchez, W. Seemüller, H. Drewes, L. Mateo, G. González, A. da Silva, J. Pampillón, W. Martínez, V. Cioce, D. Cisneros, S. Cimbaro   +10 more
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Processing of the SIRGAS 2000 GPS Network at DGFI

2002
After the first SIRGAS campaign carried out in 1995, a second GPS campaign was performed during a ten days period in May 2000. This time the project did not only include the South American countries but also Central and North America as well as the Caribbean. DGFI has processed the entire network comprising a total of 184 sites. This paper presents the
K. Kaniuth, H. Tremel, H. Drewes, K. Stuber, R. Maturana, H. Parra   +5 more
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The Definition and Realization of the Reference System in the SIRGAS Project

1998
This paper describes the different stages executed to establish the Reference System to be used in the definition of the geocentric datum in South America, in the frame of the SIRGAS project.
Melvin Hoyer, Susana R. Arcienagas, Katia Pereira, Herve Fagard, Rodrigo Maturana, Ricardo A. Torchetti, Hermann Drewes, Muneendra Kumar, Gunter Seeber   +8 more
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Preliminary Results of SIRGAS 2000 Campaign — IBGE Analysis Center

International Association of Geodesy Symposia, 2002
This paper reports the present status of SIRGAS 2000 campaign processing, carried out by the IBGE analysis center. Besides IBGE, University of Sao Paulo (USP) and Sao Paulo State University (UNESP) are collaborating with some data analysis and processing.
João Francisco Galera Monico
exaly   +2 more sources

Scientific Foundations of the SIRGAS Vertical Reference System

2002
The definition of the vertical reference system within the SIRGAS project includes four principal topics: (1) the type of heights, (2) the corresponding reference surface where heights refer to, (3) the realization of the reference frame, (4) the maintenance of the reference system.
H. Drewes, L. Sánchez, D. Blitzkow, S. Freitas   +3 more
openaire   +1 more source

The Redefinition of the Geodetic Reference System of Uruguay into SIRGAS Frame

1998
In 1908, a systematic geodetic surveys started with cadastral and mapping objetives. Classical operations were carried out along main paralel and meridian chains till 1960’s when the Fundamental Geodetic Network was finished.
Walter H. Subiza, R. Pérez Rodino, F. Barbato, Sonia M. Alves Costa   +3 more
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Time Evolution of the SIRGAS Reference Frame

1998
The geodetic reference system for South America established by the SIRGAS project and adopted by the South American countries provides a set of some 60 stations coordinates over all the continent for the epoch of its observation in May/June 1995 (1995.4). To preserve the consistency with the ITRF, station coordinates have to change in time according to
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La Sirga

Alicia está desamparada. El recuerdo de la guerra llega a su mente como amenazantes truenos. Desterrada por el conflicto armado intenta rehacer su existencia en La Sirga, un hostal deteriorado a orillas de una gran laguna en lo alto de Los Andes que pertenece a Óscar, el único familiar que conserva con vida, un viejo huraño y solitario.
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Realization of a Geocentric Reference System in Argentina in Connection with SIRGAS

1998
Between 1993 and 1994 the POSiciones Geodesicas ARgentinas (POSGAR) GPS network was observed, and early in 1995 the POSGAR’94 reference frame was established. It consists of 127 evenly distributed stations providing a relative precision better than 1 ppm in the WGS84 reference system.
J. Moirano, C. Brunini, H. Drewes, K. Kaniuth   +3 more
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The Integration of Brazilian Geodetic Network into SIRGAS — Preliminary Results —

2000
Prior to the advent of satellite positioning, geodetic systems were based on a mathematic model of the Earth which best fits over a specific area. The surveys were developed for mapping requirements where precision of a meter was considered satisfactory.
Sonia M. A. Costa, Don S. Beattie, Katia D. Pereira   +2 more
openaire   +1 more source