The Ethiopian gravimetric geoid: ETH-GM21

DOI

The ETH-GM21 model is a gravimetric geoid of 2'x2' spatial resolution developed over Ethiopia. This model has been computed using terrestrial and airborne gravity data together with the EIGEN-6C4 GGM and the SRTM3 digital elevation model. The ETH-GM21 model has been determined by using the remove-compute-restore procedure and the least-squares collocation method, obtaining geoid undulations referred to WGS84. With the use of geometric geoid heights obtained from 46 GNSS/levelling data distributed over Ethiopia, the accuracy of the ETH-GM21 gravimetric geoid model has been estimated to ±13 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).

Identifier
DOI https://doi.org/10.5880/isg.2021.004
Related Identifier https://doi.org/10.1016/j.jafrearsci.2021.104313
Related Identifier https://archive.org/details/Moritz1980AdvancedPhysicalGeodesy
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.2021.003
Metadata Access http://doidb.wdc-terra.org/oaip/oai?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:doidb.wdc-terra.org:7240
Provenance
Creator Belay, Ephrem Y.; Godah, Walyeldeen ORCID logo; Szelachowska, Malgorzata ORCID logo; Tenzer, Robert ORCID logo
Publisher GFZ Data Services
Contributor Reguzzoni, Mirko; Carrion, Daniela; Rossi, Lorenzo; Godah, Walyeldeen; ISG Staff
Publication Year 2021
Rights CC BY 4.0; http://creativecommons.org/licenses/by/4.0/
OpenAccess true
Contact Godah, Walyeldeen (Centre of Geodesy and Geodynamics, Institute of Geodesy and Cartography (IGiK), Warsaw, Poland); ISG Staff (International Service for the Geoid (ISG))
Representation
Resource Type Dataset
Version 1.0
Discipline Geodesy, Geoinformatics and Remote Sensing
Spatial Coverage (33.033W, 3.433S, 47.933E, 14.867N); Gravimetric geoid model ETH-GM21