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An important initiative, led by CENEGEO, EPUSP, and the Universidade Federal de Uberlândia (UFU), focuses on the implementation of the International Height Reference Frame (IHRF) in Brazil, in São Paulo and in Minas Gerais states. This effort involves eight points of the Brazilian GNSS Continuous Monitoring Network (RBMC—Rede Brasileira de Monitoramento Contínuo do Sistema GNSS). As part of the activity, extensive efforts have been made to collect terrestrial relative gravity data, 124,241 points. This achievement is the result of various initiatives, including the Instituto Geográfico e Cartográfico do estado de São Paulo (IGC) Mapping Project, the Instituto Brasileiro de Geografia e Estatística (IBGE) field work, and projects funded by Fundação de Amparo à Pesquisa do estado de São Paulo (FAPESP) and Fundação de Amparo à Pesquisa do estado de Minas Gerais (FAPEMIG). A special software has been developed at CENEGEO to compute the disturbing potential and to modify the Hotine kernel. This methodology relies on residual point gravity disturbances as input. The study compared three approaches for computing normal height values: (1) Hotine’s integral and gravity potential recovery from two geoid models, (2) SAM_GEOID2023 using Stokes-Helmert Geoid package (SHGeo). Finaly, (3) Least Squares Collocation (LSC) from GRAVSOFT. The XGM2019e geopotential model served as the reference, following the zero-tide concept.

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Efforts for Regional IHRF Calculation

  • 章节

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Denizar Blitzkow,
  • Valéria Cristina Silva,
  • Gabriel do Nascimento Guimarães,
  • Ana Cristina Oliveira Cancoro de Matos,
  • Edvaldo Simões da Fonseca Junior,
  • Flavio Guilherme Vaz de Almeida Filho

摘要

An important initiative, led by CENEGEO, EPUSP, and the Universidade Federal de Uberlândia (UFU), focuses on the implementation of the International Height Reference Frame (IHRF) in Brazil, in São Paulo and in Minas Gerais states. This effort involves eight points of the Brazilian GNSS Continuous Monitoring Network (RBMC—Rede Brasileira de Monitoramento Contínuo do Sistema GNSS). As part of the activity, extensive efforts have been made to collect terrestrial relative gravity data, 124,241 points. This achievement is the result of various initiatives, including the Instituto Geográfico e Cartográfico do estado de São Paulo (IGC) Mapping Project, the Instituto Brasileiro de Geografia e Estatística (IBGE) field work, and projects funded by Fundação de Amparo à Pesquisa do estado de São Paulo (FAPESP) and Fundação de Amparo à Pesquisa do estado de Minas Gerais (FAPEMIG). A special software has been developed at CENEGEO to compute the disturbing potential and to modify the Hotine kernel. This methodology relies on residual point gravity disturbances as input. The study compared three approaches for computing normal height values: (1) Hotine’s integral and gravity potential recovery from two geoid models, (2) SAM_GEOID2023 using Stokes-Helmert Geoid package (SHGeo). Finaly, (3) Least Squares Collocation (LSC) from GRAVSOFT. The XGM2019e geopotential model served as the reference, following the zero-tide concept.