2026-06-10T09:41:32Zhttp://doidb.wdc-terra.org/oaip/oai

oai:doidb.wdc-terra.org:73432022-04-08T09:25:15ZDOIDBDOIDB.ISG

false4DOIDB.ISG 10.5880/isg.2019.017 Wang, Yan Ming Yan Ming Wang 0000-0002-1766-4159 National Geodetic Survey (NGS), NOAA, Silver Spring, MD, USA Li, Xiaopeng Xiaopeng Li 0000-0002-3854-8130 National Geodetic Survey (NGS), NOAA, Silver Spring, MD, USA Ahlgren, Kevin Kevin Ahlgren 0000-0003-0453-6323 National Geodetic Survey (NGS), NOAA, Silver Spring, MD, USA Krcmaric, Jordan Jordan Krcmaric 0000-0003-3135-1412 National Geodetic Survey (NGS), NOAA, Silver Spring, MD, USA GFZ Data Services 2019 Geodesy Geoid model ISG Spherical harmonic analysis scheme Wong-Gore Stokes kernel modification Colorado experiment 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 Wang, Yan Ming National Geodetic Survey (NGS), NOAA, Silver Spring, MD, USA ISG Staff International Service for the Geoid (ISG) 2019 Dataset https://www.isgeoid.polimi.it/Geoid/America/USA/reg_listCOLORADOproject.html 10.1007/s00190-020-01429-w 10.1007/s00190-013-0653-0 10.5194/essd-13-1653-2021 http://www.isgeoid.polimi.it/ 10.5880/isg.2019.018 1.0 CC BY 4.0 The ColSHAWG-NGS2019 gravimetric quasi-geoid model has been computed by the US National Geodetic Survey (NGS). It has been worked out 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 model is 251°E ≤ longitude ≤ 257°E, 36°N ≤ latitude ≤ 39°N with a grid spacing of 1' in both latitude and in longitude. The computation method is based on the spherical harmonic analysis scheme. The airborne gravity data are combined with the reference model xGEOID17RefB to produce an enhanced reference spherical harmonic model. This model is then used in a remove-compute-restore procedure, computing residual height anomalies from terrestrial gravity data by using the Wong-Gore modification of the Stokes kernel (truncation degree equal to 980), also including the g1 term because of rugged mountains. The accuracy of the quasi-geoid model, when compared against GSVS17 GPS/leveling, is equal to 2.3 cm.

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 quasi-geoid model ColSHAWG-NGS2019 -109 -103 36 39