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Atas do VI Simpósio Luso-Brasileiro de Cartografia Histórica
Sumário
DATUM CÓRREGO ALEGRE : monumento histórico da cartografia brasileira
António Carlos Freire Sampaio, Adriany de Ávila Melo Sampaio, Tobias Pereira Silva, Willian Cesar Borges
Documento (.pdf)
AbstractIn 1949 it settled in Brazil, the Geodetic Reference System (SGR) Datum Corrego Alegre. Its specifications were defined by the Brazilian Institute of Geography and Statistics (IBGE) as: Reference Surface: International Ellipsoid Hayford 1924; semi-major axis: 6378388 meters and flattening: 1/297. Datum point: Vertex Corrego Alegre, with coordinates: latitude = ? = 19 = 50 '14.91' 'S and longitude = ? = = 48 57' 41.98 "W. Based on this information broke for fieldwork and recognition of the local coordinates, and have identified an ancient landmark, beside the road, built with bricks and mortar and with a bronze plaque. In consultations on the IBGE about the landmark found, the institute confirmed that the real datum was destroyed, and near him was another landmark. After, the IBGE sent a description of how this landmark found it departed from the datum point. With information of distance and angle from the existing landmark, it was held a working small excavation in the local datum, with the intention to find a "depth of vertex" of datum Corrego Alegre, if it existed, but nothing found. Over time, it was observed that the spot remains for abandoning appearance. With that being raised is possible to state that: identifying the two "vertices witnesses" and describing the distance and angle of the datum to mark found, it can rebuild it; even if this is not done, it can organize the site to visitors. This work, then, has the objectives to warn the cartographic community to the need for preservation of Historic Monuments of Brazilian Cartography, and Corrego Alegre should be treated as historical reference the systematic mapping of the Brazilian national territory.
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Data da última atualização: 2019-02-07
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