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ADJUSTMENT OF A REGIONAL ALTIMETRIC NETWORK, IN BRAZIL, TO ESTIMATE NORMAL HEIGHTS AND GEOPOTENTIAL NUMBERS

In 2018, the Brazilian Institute of Geography and Statistics (IBGE) defined the normal height values and geopotential numbersfortheHigh Precision Altimetric Network (HPAN), creating the need for developing procedures ableto adapt works correlated with the Brazilian Geodetic System (BGS). In that con...

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Bibliographic Details
Published in:Boletim de Ciências Geodésicas 2020, Vol.26 (1), p.1-13
Main Author: Marotta, Giuliano Sant’Anna
Format: Article
Language:English
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Summary:In 2018, the Brazilian Institute of Geography and Statistics (IBGE) defined the normal height values and geopotential numbersfortheHigh Precision Altimetric Network (HPAN), creating the need for developing procedures ableto adapt works correlated with the Brazilian Geodetic System (BGS). In that context, and considering the state and municipal altimetric networks, it is necessary to estimate normal heights. To this end, this paper proposes to estimate normal height values and geopotential numbers for the Altimetric Network of the Federal District (AN-DF). Computational procedures involving the Least Squares Method were established and applied in a geometric levelling survey, which includes 200 stations distributed throughout the study area. The obtained results allowed estimating the normal heights of the network stations with accuracy up to 0.032m. However, because significant differences were found in the adjusted and known values of some used HPAN stations, we recommend a rigorous analysis of these stations before using them. In any case considering that the geometric levelling and the applied procedures were carried out correctly, it is suggested that the values estimated for all stations of the AN-DF in this work may be used.
ISSN:1413-4853
1982-2170
1982-2170
DOI:10.1590/s1982-21702020000100002