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- W3141799424 abstract "The accuracy and feasibility of computing the zenith tropospheric delays (ZTDs) from data of the Euro- pean Center for Medium-Range Weather Forecasts (ECMWF) and the United States National Centers for Environmental Prediction (NCEP) are studied. The ZTDs are calculated from ECMWF/NCEP pressure-level data by integration and from the surface data with the Saastamoi- nen model method and then compared with the solutions measured from 28 global positioning system (GPS) stations of the Crustal Movement Observation Network of China (CMONOC) for 1 year. The results are as follows: (1) the error of the integration method is 1-3 cm less than that of the Saastamoinen model method. The agreement between the ECMWF ZTD and GPS ZTD is better than that between NCEP ZTD and GPS ZTD; (2) the bias and root mean square difference (RMSD), especially the latter, have a seasonal variation, and the RMSD decreases with increasing altitude while the variation with latitude is not obvious; and (3) when using the full horizontal resolution of 0.5 9 0.5 of the ECMWF meteorological data in place of a reduced 2.5 9 2.5 grid, the mean RMSD between GPS and ECMWF ZTD decreases by 4.5 mm. These results illuminated the accuracy and feasibility of com- puting the tropospheric delays and establishing the ZTD prediction model over China for navigation and positioning with ECMWF and NCEP data." @default.
- W3141799424 created "2021-04-13" @default.
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- W3141799424 date "2011-01-01" @default.
- W3141799424 modified "2023-09-26" @default.
- W3141799424 title "Assessment of ZTD derived from ECMWF/NCEP data with GPS ZTD over China" @default.
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