Abstract:A avaliação do modelo geoidal oficial do Brasil, o MAPGEO2010, mostra que suas menores resoluções situam-se nos estados do Maranhão e do Piauí, com discrepâncias variando de cerca de ±1 m em 500 km. Justamente, em tal região se faz necessário um melhor modelo geoidal em vista das limitações de informações geodésicas existentes. Com base no problema evidenciado na região destacada, buscou-se avaliar o comportamento das alturas geoidais oriundas de alguns Modelos Globais do Geopotencial MGGs. Foram utilizados co… Show more
“…Another consistent value for the shift of the zero height of BFAN related with a WHS was obtained by Melo (2011). In his study they were used several GGMs available in the International Center for Global Earth Models (ICGEM) of IAG and the MAPGEO2010 produced by IBGE.…”
Section: Fundamental Altimetric Network Geoid/ Quasigeoid and A World...mentioning
The satellite platforms allowed a very quick transition from local or regional Geodetic Reference Systems (GRSs) to the global ones. The evolution of methods also brought changes in the standards of precision and accuracy. Networks based on local Datums which had relative precision in the order of 1:100,000 to 1:150,000, like the classical networks in the Brazilian Geodetic System (BGS), could be easily replaced by networks constrained in geocentric Datums which reach relative precision of 1:10,000,000 or better and placed inside a concept of a Global Hierarchy. Besides the facilities for positioning, the modern satellite platforms of remote sensors are also applied for satellite altimetry, multi spectral imagery and on-board satellite gravimetry. This allows relevant geodetic information linked directly in global geocentric GRSs. Then, the modern orbital platforms changed completely the ability to capture, model and manage spatial data with strong implications in Geodesy and Cartography. The associated new data bases for Cartography have several new implications coming from the applied surveying methods and present paradigms of precision. Most of the implications come from the need of relating geometric and physical aspects. This happen due the necessary association of local measurements affected by the local gravity field to global oriented geocentric GRS. The modern Global Geopotential Models (GGMs) have a strong expectation for uses in the referred integration. In this paper are discussed the impacts of "spatial age" on the geodetic methods for surveying and mapping. The possible applications of GGMs for realizing fundamental geodetic networks, surveying and mapping are also discussed.
“…Another consistent value for the shift of the zero height of BFAN related with a WHS was obtained by Melo (2011). In his study they were used several GGMs available in the International Center for Global Earth Models (ICGEM) of IAG and the MAPGEO2010 produced by IBGE.…”
Section: Fundamental Altimetric Network Geoid/ Quasigeoid and A World...mentioning
The satellite platforms allowed a very quick transition from local or regional Geodetic Reference Systems (GRSs) to the global ones. The evolution of methods also brought changes in the standards of precision and accuracy. Networks based on local Datums which had relative precision in the order of 1:100,000 to 1:150,000, like the classical networks in the Brazilian Geodetic System (BGS), could be easily replaced by networks constrained in geocentric Datums which reach relative precision of 1:10,000,000 or better and placed inside a concept of a Global Hierarchy. Besides the facilities for positioning, the modern satellite platforms of remote sensors are also applied for satellite altimetry, multi spectral imagery and on-board satellite gravimetry. This allows relevant geodetic information linked directly in global geocentric GRSs. Then, the modern orbital platforms changed completely the ability to capture, model and manage spatial data with strong implications in Geodesy and Cartography. The associated new data bases for Cartography have several new implications coming from the applied surveying methods and present paradigms of precision. Most of the implications come from the need of relating geometric and physical aspects. This happen due the necessary association of local measurements affected by the local gravity field to global oriented geocentric GRS. The modern Global Geopotential Models (GGMs) have a strong expectation for uses in the referred integration. In this paper are discussed the impacts of "spatial age" on the geodetic methods for surveying and mapping. The possible applications of GGMs for realizing fundamental geodetic networks, surveying and mapping are also discussed.
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