Toward a 10' resolution geoid for South America: a comparison study |
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| Institution: | 1. Swedish University of Agricultural Sciences, Department of Urban and Rural Development, Box 7012, 750 07 Uppsala, Sweden;2. Copenhagen University, Department for Architecture and Planning, Rolighedsvej 23, 1958 Frederiksberg C, Copenhagen, Denmark.;3. Universidad El Bosque, Instituto de Salud y Ambiente, 110121 Bogotá, Colombia.;4. KTH Royal Institute of Technology, Department of Sustainable Development, Environmental Science and Engineering, Teknikringen 10B, SE-100 44 Stockholm, Sweden.;5. Stockholm Environment Institute, Linnégatan 87D, Box 24218, SE-104 51 Stockholm, Sweden;6. Universidad El Bosque, Programa de Ingeniería Ambiental, Facultad de Ingeniería, 110121 Bogotá, Colombia;1. Department of Neurology, Perelman School of Medicine, University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA;2. NVIDIA GmbH, Einsteinstraße 172, Munich 81677, Germany;3. German Center for Vertigo and Balance Disorders, LMU Klinikum, Munich 81377, Germany;4. Scheie Eye Institute, Department of Ophthalmology, Perelman School of Medicine, University of Pennsylvania, 3400 Civic Center Blvd., Philadelphia, PA 19104, USA |
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| Abstract: | Since the creation of the Sub-Commission for the Geoid in South America (SCGSA) in 1993, many efforts have been carried out in the different countries in order to improve the geoid computations. The validation of the gravity data in Brazil, Uruguay, Argentina and Chile has improved many of the gravity surveys in those countries. GPS observations carried out on benchmarks of the geometric levelling have been facilitated by the SIRGAS (Geocentric Reference System for South America) project and can contribute for testing the gravimetric determination of the geoid. Several countries made available GPS data for SCGSA like Brazil, Argentina, Venezuela and Chile. The Digital Terrain Model (DTM) has been improved considerably in Brazil and Argentina. A great number of topographic maps has been digitized to generate a DTM grid of 3′ resolution (DTM3). New gravity surveys in the Amazonas region have been in progress along Rio Negro and its tributaries. Many different organizations in most of the countries in South America have been involved with local or national geoid computations. This fact has brought attention to the data in several countries facilitating the efforts for a continental geoid. All these activities are strongly supported by Geophysical Exploration Technology (GETECH) — University of Leeds. The objective envisaged at the moment is to produce a 10′ resolution geoid for South America using FFT and to compare the result with that of the numerical integration of the modified Stokes integral. |
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