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

President

Gabriel do Nascimento Guimarães

(gabriel@ufu.br),

UFU, Brasil.

Geopotential models coordinator

  • Ayelen Pereira
  • (apereira@fceia.unr.edu.ar),
  • UNR, Argentina

Bandera de Alemania - Wikipedia, la enciclopedia libre

Gravimetric networks coordinator

  • Ezequiel Antokoletz
  • (ezequiel.antokoletz@bkg.bund.de),
  • BKG, Alemania

Geoid Models Coordinator

  • Ana Cristina O. C. de Matos
  • (acocmatos@gmail.com),
  • CENEGEO, Brasil

Gravimetric networks coordinator

  • José Luis Carrión Sánchez
  • (josecarrionsa@gmail.com),
  • IGM, Ecuador

Argentina

  • 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
  • Marco Neri ( mneri@ign.gob.ar), Argentina
  • Sergio Cimbaro ( scimbaro@ign.gob.ar), Argentina

Bolivia

  • Hernan Jose Guerra Trigo (trigo.guerra.hernan@gmail.com), IGM, Bolivia

Brasil

  • Andrea Galudht Santacruz Jaramillo (andrea.jaramillo@eng.uerj.br), UERJ, Brasil
  • Regiane Dalazoana (regiane@ufpr.br), UFPR, Brasil
  • Tiago Lima Rodrigues (tiagorodrigues@ufpr.br), UFPR, Brasil
  • Denizar Blitzkow (dblitzko@usp.br), USP/CENEGEO, Brasil
  • Roberto Teixeira Luz (roberto.luz@ibge.gov.br), IBGE, Brasil
  • Salomão Soares (salomao.soares @ ibge.gov.br), IBGE, Brasil
  • Nilton de Souza Ribas Junior (nilton.junior @ ibge.gov.br), IBGE, Brasil

Canadá

  • Jianliang Huang,(jianliang.huang@canada.ca) NRCan, Canadá

Chile

  • Jose Tarrío (jose.tarrio@usach.cl), USACH, Chile
  • Sergio Rozas Bornes (sirgas@igm.cl), IGM, Chile

Colombia

  • José Ricardo Guevara (jguevara@igac.gov.co), IGAC, Colombia
  • Siervo William León Callejas (swleon@igac.gov.co), IGAC, Colombia
  • Enrique Torres Moya (enrique.torres@igac.gov.co), IGAC, Colombia

Costa Rica

  • 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

Ecuador

  • Fredy Cristóbal Flores Estrella (fredy.flores@geograficomilitar.gob.ec), IGM, Ecuador

México

  • Ana Isela Vidal Vega (anavidal@uas.edu.mx), UAS, México
  • Alfredo Esparza-Ramírez ( aesparza@cenam.mx ), CENAM, México

Panamá

  • Javier A. Cornejo (jcornejo@anati.gob.pa), IGN, Panamá

Perú

  • Rogger Montoya Morray (rmontoyaign02@gmail.com), IGN, Perú

República Dominicana

  • Saulimar Rodriguez Montilla (s.rodriguez@ign.gob.do), IGN-JJHM, Republica Dominicana

Uruguay

  • Walter Subiza (walter.subiza.pina@igm.gub.uy), IGM, Uruguay

USA

  • Xiaopeng Li (xiaopeng.li@noaa.gov), NOAA, Estados Unidos

Venezuela

  • Nilbeny Cano Finil (nilbecf20@gmail.com), IGVSB, Venezuela
  • Melvin Hoyer (melvinhoyer@gmail.com), LUZ, Venezuela
  • Napoleón Hernandez (josenapoleonhernandez@gmail.com), IGVSB, Venezuela

Previous Presidents

(2013 – 2019) Silvio Rogério Correia de Freitas , UFPR, Brasil

(2008 – 2013) Roberto Texeira Luz , IBGE, Brasil

(2007 – 2008) William Martínez Díaz , IGAC, Colombia

Bandera de Alemania - Wikipedia, la enciclopedia libre(2001 – 2007) Laura Sánchez, IGAC/DGFI, Colombia/Alemania

(1997 – 2001) Roberto Texeira Luz, IBGE, Brasil

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