2026-06-17T16:08:35Zhttp://doidb.wdc-terra.org/oaip/oai

oai:doidb.wdc-terra.org:73812026-06-10T10:17:30ZDOIDBDOIDB.ISG

false4DOIDB.ISG 10.5880/isg.2020.010 Silva, Valéria Cristina Valéria Cristina Silva 0000-0003-1499-6956 Universidade de São Paulo, São Paulo, Brazil de Almeida Filho, Flavio Guilherme Vaz Flavio Guilherme Vaz de Almeida Filho 0000-0002-8111-3204 Universidade de São Paulo, São Paulo, Brazil Blitzkow, Denizar Denizar Blitzkow 0000-0003-1412-3063 Universidade de São Paulo, São Paulo, Brazil; Centro de Estudos de Geodesia (CENEGEO), São Paulo, Brazil de Matos, Ana Cristina Oliveira Cancoro Ana Cristina Oliveira Cancoro de Matos 0000-0002-0040-588X Centro de Estudos de Geodesia (CENEGEO), São Paulo, Brazil GFZ Data Services 2020 Geodesy Geoid model ISG Fast Fourier Transform São Paulo State EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY Reguzzoni, Mirko Mirko Reguzzoni 0000-0002-4027-9347 International Service for the Geoid (ISG), Politecnico di Milano, Italy Carrion, Daniela Daniela Carrion 0000-0003-1262-9394 International Service for the Geoid (ISG), Politecnico di Milano, Italy Rossi, Lorenzo Lorenzo Rossi 0000-0001-6050-1972 International Service for the Geoid (ISG), Politecnico di Milano, Italy Silva, Valéria Cristina Universidade de São Paulo, São Paulo, Brazil ISG Staff International Service for the Geoid (ISG) 2020 Dataset 10.1590/1982-2170-2020-0061 10.5194/essd-13-1653-2021 http://www.isgeoid.polimi.it/ 10.5880/isg.2020.007 10.5880/isg.2020.008 10.5880/isg.2020.009 1.0 CC BY 4.0 The 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 720. The geoid model was derived from the Bouguer gravity anomalies. 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).
Gravimetric geoid model GEOID-SP-2020-GGM720 -55.9583 -43.0417 -26.9583 -17.0417