SIRGAS

Working group III

SIRGAS-WGIII (Vertical datum) was established during the IAG Scientific Assembly held in Rio de Janeiro in 1997. Its main objectives are to define a modern unified vertical reference system for SIRGAS, to establish the corresponding reference frame, and to transform the existing classical height datums to the new system. As a fundamental SIRGAS-WGIII activity a diagnostic of the existing height datum was carried out, the main conclusions are:

  1. The reference level of the American height datums is realized by the mean sea level registered at individual tide gauges over different periods, i.e. they refer to different epochs,
  2. The vertical networks were extended over each country using mainly spirit levelling methods, but in general the levelled heights have not been corrected by the gravity effects,
  3. They do not take into account the variation of heights and reference levels with time, i.e. they are static, and therefore
  4. These vertical datums present big discrepancies between neighbouring countries, they do not permit data exchange neither in continental nor in global scale, and they are not able to support practical height determination with GNSS techniques in combination with precise geoid models.

The definition of the new SIRGAS vertical reference system is identical with the definition of the International Height Reference System (IHRS) given by the Resolution No. 1, 2015, of the International Association of Geodesy (IAG). The realization of the new SIRGAS vertical reference system must be a regional densification of the International Height Reference Frame (IHRF). The geometrical component corresponds to ellipsoidal heights referred to the SIRGAS reference frame. The physical component is given in terms of geopotential quantities (W0 as a reference level and geopotential numbers as primary coordinates), and its realization should:

  1. Refer to the conventional W0 value adopted by Resolution No. 1, 2015 of the IAG,
  2. Be given by proper physical heights (derived from spirit levelling in combination with gravity reductions or by gravity field analysis of high-resolution), and
  3. Be associated to a specific reference epoch, i.e. it should consider the coordinate and referential changes with time.

Members of the SIRGAS-WGIII

  • Gabriel do Nascimento Guimarães (gabriel@ufu.br), presidente, UFU, Brasil
  • Ayelen Pereira (apereira@fceia.unr.edu.ar), coordinadora modelos geopotenciales, UNR, Argentina
  • Ezequiel Antokoletz (ezequiel.antokoletz@bkg.bund.de), coordinador de redes gravimétricas,  BKG, Alemania
  • Ana Cristina O. C. de Matos (acocmatos@gmail.com), coordinadora modelos geoidales, CENEGEO, Brasil
  • José Luis Carrión Sánchez (josecarrionsa@gmail.com), coordinador de redes gravimétricas, IGM, Ecuador
  • Agustín Gómez (agusgomez@fcaglp.unlp.edu.ar), UNLP, Argentina
  • Juan Francisco Moirano (jmoirano@fcaglp.unlp.edu.ar), UNLP, Argentina
  • Claudia Tocho (ctocho@yahoo.com.ar), UNLP, Argentina
  • Regiane Dalazoana (regiane@ufpr.br), UFPR, Brasil
  • Denizar Blitzkow (dblitzko@usp.br), USP/CENEGEO, Brasil
  • Roberto Teixeira Luz (roberto.luz@ibge.gov.br), IBGE, Brasil
  • Andrea Galudht Santacruz Jaramillo (andrea.jaramillo@eng.uerj.br), UERJ, Brasil
  • Tiago Lima Rodrigues (tiagorodrigues@ufpr.br), UFPR, Brasil
  • Jianliang Huang,(jianliang.huang@canada.ca) NRCan, Canadá
  • Jose Tarrío (jose.tarrio@usach.cl), USACH, Chile
  • Sergio Rozas Bornes (sirgas@igm.cl), IGM, Chile
  • María Marta Mora Rivas (mmorar@rnp.go.cr), IGN, Costa Rica
  • Álvaro Álvarez Calderón (aalvarez.igncr@gmail.com), IGN, Costa Rica
  • Mauricio Varela Sanchez (mauricio.varelasanchez@ucr.ac.cr), UCR, Costa Rica
  • Leidy Johanna Moisés Sepúlveda (leidydumoises@hotmail.com), IGAC, Colombia
  • Siervo William León Callejas (swleon@igac.gov.co), IGAC, Colombia
  • Ana Isela Vidal Vega (anavidal@uas.edu.mx), UAS, México
  • Alfredo Esparza-Ramírez ( aesparza@cenam.mx ), CENAM, México
  • Fredy Cristóbal Flores Estrella (fredy.flores@geograficomilitar.gob.ec), IGM, Ecuador
  • Xiaopeng Li (xiaopeng.li@noaa.gov), NOAA, Estados Unidos
  • Javier A. Cornejo (jcornejo@anati.gob.pa), IGN, Panamá
  • Rogger Montoya Morray (rmontoyaign02@gmail.com), IGN, Peru
  • Saulimar Rodriguez Montilla (s.rodriguez@ign.gob.do), IGN-JJHM, Republica Dominicana
  • Walter Subiza (walter.subiza.pina@igm.gub.uy), IGM, Uruguay
  • Nilbeny Cano Finil (nilbecf20@gmail.com), IGVSB, Venezuela
  • Melvin Hoyer (melvinhoyer@gmail.com), LUZ, Venezuela
  • Napoleón Hernandez (josenapoleonhernandez@gmail.com), IGVSB, Venezuela
  • Salomão Soares (salomao.soares @ ibge.gov.br), IBGE, Brasil
  • Nilton de Souza Ribas Junior (nilton.junior @ ibge.gov.br), IBGE, Brasil
  • Hernan Jose Guerra Trigo (trigo.guerra.hernan@gmail.com), IGM, Bolivia
  • Marco Neri ( mneri@ign.gob.ar)Argentina
  • Sergio Cimbaro ( scimbaro@ign.gob.ar)Argentina

Presidentes anteriores

  • Silvio Rogério Correia de Freitas (2013 – 2019), UFPR, Brasil
  • Roberto Texeira Luz (2008 – 2013), IBGE, Brasil
  • William Martínez Díaz (2007 – 2008), IGAC, Colombia
  • Laura Sánchez (2001 – 2007), IGAC/DGFI, Colombia/Alemania
  • Roberto Texeira Luz (1997 – 2001), IBGE, Brasil
Scroll to top