Sapucci, Luiz FernandoGalera Monico, Joao Francisco [UNESP]Toledo Machado, Luiz AugustoDos Santos Rosa, Guilherme Poleszuk [UNESP]2014-05-202014-05-202008-01-01Boletim de Ciências Geodesicas. Curitiba Pr: Universidade Federal do Paraná (UFPR), Centro Politecnico, v. 14, n. 4, p. 591-605, 2008.1413-4853http://hdl.handle.net/11449/6704A Center for Weather Forecast and Climatic Studies of National Institute for Space Research (CPTEC/INPE) has provided to the Brazilian Geodetic community, since 2004, an alternative to correct the GNSS observables from the tropospheric refraction. Numerical Weather Prediction (NWP) Model is used to generate Zenital Tropospheric Delay (ZTD). For the version 1, it was developed a model with horizontal resolution of 100 km, which was updated with Eta model, with resolution of 20 km. This paper provides the most significative details of the current version, as well an evaluation of its quality, using for such ZTD estimates from GPS data collect at RBMC. Comparing to the old version, considerable improvement could be observed from the new model, mainly in Brasilia and Curitiba, reaching up to 55% improvement. When all stations were used in the quality control, almost null bias and RMS of about 4 to 5 cm could be observed.591-605porTropospheric modelingZenithal Tropospheric DelayZTDNumerical Weather PredictionArtigoWOS:000264127500008Acesso abertoWOS000264127500008.pdf7180879644760038