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Boletim de Ciências Geodésicas, Volume: 29, Número: 1, Publicado: 2023
  • Study of the geometry influence of the support points in coordonates transformation: application from WGS84 to NS59 datum Original Article

    Medjahed, Sid Ahmed

    Resumo em Inglês:

    Abstract: The use of a transformation method for the passage from one geodetic system to another requires the use of some common points as support points, these points are used in the determination of the transformation parameters. Generally, the choice of the support points is effected manually by choosing the best distribution of these points in the transformation area. In the present study, we present a methodology of selection of these points where an algorithm takes into account the computation of the transformation parameters with all combinations between the common points and the best result will be adopted. An application of this methodology are carried out in North-East of Algeria to determine the best set of the 09 transformation parameters between the WGS84 system and the National North Sahara system using 10 common points (05 support and 05 control). This methodology is efficient in the case where the common points are near one another.
  • Harmonizing income classes from 2000 and 2010 Brazilian censuses Original Article

    Araujo, Agnes Silva de; Saraiva, Marcus Vinícius Pereira; Barros, Joana; Queiroz, Alfredo Pereira de

    Resumo em Inglês:

    Abstract: Income variables from the Brazilian population census (IBGE) are often used as proxies for the population’s socioeconomic level in spatial analyses of urban segregation, inequality and social exclusion. However, income variables are dependent on reference values (minimum wage) that change over time, which can be challenging for multitemporal analysis. This paper discusses this issue and proposes a methodology to adjust income data that allows a meaningful comparison between the datasets of two Census periods. The methodology was applied to five medium-sized cities of the state of São Paulo by adjusting income data from Census 2000 and 2010 according to the period’s inflation rates. The analysis shows that the methodology mitigates the comparability issues. Results better reflect the changes in population composition and in residential patterns of different income groups that took place over the 2000s in Brazil in medium-sized cities.
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