The PoliMI geoid based on windowed Least-Squares Collocation for the Colorado Experiment: ColWLSC2020


The ColWLSC2020 geoid model is a gravimetric model and has been computed by Department of Civil and Environmental Engineering (DICA), Politecnico di Milano. The model has been computed in the frame of the International Association of Geodesy Joint Working Group 2.2.2 "The 1 cm geoid experiment" and the so called "Colorado experiment". The area covered by the models is 108.5°E ≤ longitude ≤ 103.5°E, 36.5°N ≤ latitude ≤ 38°N with a grid spacing of 2' in both latitude and in longitude.

The computation is based on the remove-compute-restore technique with XGM2106 being used as a reference field. The topographic effects were treated using a Residual Terrain Correction (RTC) by solving the spectral filter problem of RTC using Earth2014 and ERTM2160 models. The input gravity data include terrestrial and airborne data combined using Least-Squares Collocation (LSC). The final estimation was carried out using Windowed LSC (WLSC). The mean accuracy of the geoid model, when compared against GSVS17 GPS/leveling, is at 3.9 cm level.

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.

Related Identifier
Related Identifier
Related Identifier
Related Identifier
Metadata Access
Creator Barzaghi, Riccardo (ORCID: 0000-0002-2847-3841); Carrion, Daniela (ORCID: 0000-0003-1262-9394); Koç, Öykü
Publisher GFZ Data Services
Contributor Reguzzoni, Mirko; Carrion, Daniela; Rossi, Lorenzo; Barzaghi, Riccardo; ISG Staff
Publication Year 2020
Rights CC BY 4.0;
OpenAccess true
Contact Barzaghi, Riccardo (Department of Civil and Environmental Engineering (DICA), Politecnico di Milano, Italy); ISG Staff (International Service for the Geoid (ISG))
Resource Type Dataset
Version 1.0
Discipline Geodesy, Geoinformatics and Remote Sensing
Spatial Coverage (-108.500W, 36.500S, -103.500E, 38.000N); Gravimetric geoid model ColWLSC2020