The gravimetric quasi-geoid of São Paulo State: QGEOID-SP-2020-GGM250

DOI

The quasi-geoid model of São Paulo State was computed using the updated and filtered gravimetric data and the new system of the normal height of the 2018 Brazilian Vertical Reference Frame (BVRF). For the ocean area, gravity anomalies of the DTU13 model with a resolution of 1’ were used. To quantify the terrain effects through the Residual Terrain Model procedure, the SRTM15+ DTM was used. The computation of the quasi-geoid model was performed by numerical integration through the Fast Fourier Transform (FFT). The Molodensky gravity anomaly was determined in a 5’x5’ grid and reduced and restored using the Residual Terrain Model (RTM) technique and the XGM2019e global gravity model truncated at degree and order 250. The zero-order degree term was added in the final computation. The validation for the quasi-geoid model based on 291 GPS measurements in the leveling network has shown 18 cm RMS difference.

The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.

The International Service for the Geoid (ISG) was founded in 1992 (as International Geoid Service - IGeS) and it is now an official service of the International Association of Geodesy (IAG), under the umbrella of the International Gravity Field Service (IGFS). The main activities of ISG consist in collecting, analysing and redistributing local and regional geoid models, as well as organizing international schools on the geoid determination (Reguzzoni et al., 2021).

Identifier
DOI https://doi.org/10.5880/isg.2020.007
Related Identifier https://doi.org/10.1590/1982-2170-2020-0061
Related Identifier https://doi.org/10.5194/essd-13-1653-2021
Related Identifier http://www.isgeoid.polimi.it/
Related Identifier https://doi.org/10.5880/isg.2020.008
Related Identifier https://doi.org/10.5880/isg.2020.009
Related Identifier https://doi.org/10.5880/isg.2020.010
Metadata Access http://doidb.wdc-terra.org/oaip/oai?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:doidb.wdc-terra.org:7380
Provenance
Creator Silva, Valéria Cristina ORCID logo; de Almeida Filho, Flavio Guilherme Vaz ORCID logo; Blitzkow, Denizar ORCID logo; de Matos, Ana Cristina Oliveira Cancoro (ORCID: 0000-0002-0040-588X)
Publisher GFZ Data Services
Contributor Reguzzoni, Mirko; Carrion, Daniela; Rossi, Lorenzo; Silva, Valéria Cristina; ISG Staff
Publication Year 2020
Rights CC BY 4.0; http://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact Silva, Valéria Cristina (Universidade de São Paulo, São Paulo, Brazil); ISG Staff (International Service for the Geoid (ISG))
Representation
Resource Type Dataset
Version 1.0
Discipline Geodesy, Geoinformatics and Remote Sensing
Spatial Coverage (-55.958W, -26.958S, -43.042E, -17.042N); Gravimetric quasi-geoid model QGEOID-SP-2020-GGM250