10.5880/isg.2019.010 eng dataset GFZ German Research Centre for Geosciences datapub@gfz-potsdam.de http://www.gfz-potsdam.de Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences pointOfContact 2021-11-05 urn:ogc:def:crs:EPSG:4326 The CASM geoid based on spectral combination approach for the Colorado Experiment: ColSCA-CASM2019 2021-11-05 revision 2019 creation doi:10.5880/isg.2019.010 Jiang, Tao Chinese Academy of Surveying and Mapping, Beijing, China author GFZ Data Services publisher The ColSCA-CASM2019 gravimetric geoid model has been computed by the Chinese Academy of Surveying and Mapping (CASM). 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 109.5°W ≤ longitude ≤ 102.5°W, 35.5°N ≤ latitude ≤ 39.5°N with a grid spacing of 1' in both latitude and in longitude. The height anomaly computation from the satellite gravity model GOCO05S, terrestrial and airborne gravity data is based on the spectral combination approach. Spectral weights of each dataset are determined by using the KTH error degree variance estimation method. A remove-compute-restore procedure, based on the EGM2008 global gravity model, is applied to account for the contribution outside local gravity data coverage. A residual terrain correction is computed from the SRTM model to consider the short wavelength components of gravity field generated by the high frequency part of topography. Height anomalies are converted to geoid undulations by using the refined Bouguer anomalies and the gradient of the gravitational potential (Flury and Rummel, 2009). The accuracy of the geoid model, when compared against GSVS17 GPS/leveling, is equal to 3.5 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. Jiang, Tao Chinese Academy of Surveying and Mapping, Beijing, China casmjt@sina.com pointOfContact ISG Staff International Service for the Geoid (ISG) isg@polimi.it http://www.isgeoid.polimi.it/ informtion pointOfContact Geodesy Geoid model ISG Spectral combination approach Colorado experiment EARTH SCIENCE > SOLID EARTH > GEODETICS > GEOID CHARACTERISTICS EARTH SCIENCE > SOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY NASA/GCMD Earth Science Keywords publication CC BY 4.0 CC BY 4.0 https://www.isgeoid.polimi.it/Geoid/America/USA/reg_listCOLORADOproject.html URL IsPartOf 10.1186/s40623-020-01287-y DOI IsDocumentedBy http://www.isgeoid.polimi.it/Geoid/format_specs.html URL IsDocumentedBy 10.1007/s00190-016-0932-7 DOI References 10.1007/s00190-009-0302-9 DOI References 10.5194/essd-13-1653-2021 DOI References http://www.isgeoid.polimi.it/ URL References 10.5880/isg.2019.009 DOI IsVariantFormOf eng geoscientificInformation Gravimetric geoid model ColSCA-CASM2019 -109.5 -102.5 35.5 39.9 http://doi.org/10.5880/isg.2019.010 WWW:LINK-1.0-http--link Data Access - DOI Data Access - DOI information