{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,31]],"date-time":"2026-03-31T10:11:31Z","timestamp":1774951891156,"version":"3.50.1"},"reference-count":25,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2018,10,31]],"date-time":"2018-10-31T00:00:00Z","timestamp":1540944000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["41574028"],"award-info":[{"award-number":["41574028"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>With the availability to high-accuracy a priori zenith wet delay (ZWD) data, the positioning efficiency of the precise point positioning (PPP) processing can be effectively improved, including accelerating the convergence time and improving the positioning precision, in ground-based Global Navigation Satellite System (GNSS) technology. Considering the limitations existing in the state-of-the-art ZWD models, this paper established and evaluated a new in-situ meteorological observation-based grid model for estimating ZWD named GridZWD using the radiosonde data and the European Centre for Medium-Range Weather Forecasts (ECWMF) data. The results show that ZWD has a strong correlation with the meteorological parameter water vapor pressure in continental and high-latitude regions. The root of mean square error (RMS) of 24.6 mm and 36.0 mm are achievable by the GridZWD model when evaluated with the ECWMF data and the radiosonde data, respectively. An accuracy improvement of approximately 10%~30% compared with the state-of-the-art models (e.g., the Saastamoinen, Hopfield and GPT2w models) can be found for the new built model.<\/jats:p>","DOI":"10.3390\/rs10111718","type":"journal-article","created":{"date-parts":[[2018,10,31]],"date-time":"2018-10-31T11:55:41Z","timestamp":1540986941000},"page":"1718","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Establishment and Evaluation of a New Meteorological Observation-Based Grid Model for Estimating Zenith Wet Delay in Ground-Based Global Navigation Satellite System (GNSS)"],"prefix":"10.3390","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7723-4601","authenticated-orcid":false,"given":"Yibin","family":"Yao","sequence":"first","affiliation":[{"name":"School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China"},{"name":"Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China"}]},{"given":"Zhangyu","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China"}]},{"given":"Chaoqian","family":"Xu","sequence":"additional","affiliation":[{"name":"School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China"}]}],"member":"1968","published-online":{"date-parts":[[2018,10,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3615","DOI":"10.1002\/2013GL058721","article-title":"Real-time GPS sensing of atmospheric water vapor: Precise point positioning with orbit, clock, and phase delay corrections","volume":"41","author":"Li","year":"2014","journal-title":"Geophys. Res. Lett."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"7189","DOI":"10.1002\/2015JD023454","article-title":"Retrieving of atmospheric parameters from multi-GNSS in real time: Validation with water vapor radiometer and numerical weather model","volume":"120","author":"Li","year":"2015","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"5965","DOI":"10.5194\/amt-9-5965-2016","article-title":"Tropospheric delay parameters from numerical weather models for muulti-GNSS precise positioning","volume":"9","author":"Lu","year":"2016","journal-title":"Atmos. Meas. Tech."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1019","DOI":"10.1007\/s00190-017-1005-2","article-title":"Improving BeiDou real-time precise point positioning with numerical weather models","volume":"91","author":"Lu","year":"2017","journal-title":"J. Geod."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1217","DOI":"10.1093\/gji\/ggw451","article-title":"Enhancing real-time precise point positioning with zenith troposphere delay products and the determination of corresponding tropospheric stochastic models","volume":"208","author":"Yao","year":"2017","journal-title":"Geophys. J. Int."},{"key":"ref_6","first-page":"247","article-title":"Atmospheric correction for the troposphere and stratosphere in radio ranging satellites","volume":"15","author":"Saastamoinen","year":"1972","journal-title":"Geophys. Monogr. Ser."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"357","DOI":"10.1029\/RS006i003p00357","article-title":"Tropospheric effect on electromagnetically measured range: Prediction from surface weather data","volume":"6","author":"Hopfield","year":"1971","journal-title":"Radio Sci."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Zhou, C., Peng, B., Li, W., Zhong, S., Ou, J., Chen, R., and Zhao, X. (2017). Establishment of a Site-Specific Tropospheric Model Based on Ground Meteorological Parameters over the China Region. Sensors, 17.","DOI":"10.3390\/s17081722"},{"key":"ref_9","unstructured":"Collins, J.P., and Langley, R.B. (1997). A Tropospheric Delay Model for the User of the Wide Area Augmentation System, Department of Geodesy and Geomatics Engineering, University of New Brunswick."},{"key":"ref_10","unstructured":"Collins, J.P., and Langley, R.B. (1998). The residual tropospheric propagation delay: How bad can it get. ION GPS, Institute of Navigation."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1017\/S0373463300001107","article-title":"Assessment of EGNOS tropospheric correction model","volume":"54","author":"Penna","year":"2001","journal-title":"J. Navig."},{"key":"ref_12","unstructured":"Ueno, M., Hoshinoo, K., Matsunaga, K., Kawai, M., Nakao, H., Langley, R.B., and Bisnath, S.B. (2001, January 11\u201314). Assessment of atmospheric delay correction models for the Japanese MSAS. Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) 2001, Salt Lake City, UT, USA."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"679","DOI":"10.1007\/s00190-007-0135-3","article-title":"Short note: A global model of pressure and temperature for geodetic applications","volume":"81","author":"Heinkelmann","year":"2007","journal-title":"J. Geod."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1007\/s10291-013-0316-x","article-title":"The TropGrid2 standard tropospheric correction model","volume":"18","year":"2014","journal-title":"GPS Sol."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1069","DOI":"10.1002\/grl.50288","article-title":"GPT2: Empirical slant delay model for radio space geodetic techniques","volume":"40","author":"Lagler","year":"2013","journal-title":"Geophys. Res. Lett."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"10273","DOI":"10.1038\/srep10273","article-title":"A new global GNSS tropospheric correction model","volume":"5","author":"Yao","year":"2015","journal-title":"Sci. Rep."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"358","DOI":"10.1016\/j.jastp.2018.08.016","article-title":"Extending a model for water vapor sounding by ground-based GNSS in the vertical direction","volume":"179","author":"Yao","year":"2018","journal-title":"J. Atmosp. Solar-Terr. Phys."},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"B\u00f6hm, J., M\u00f6ller, G., Schindelegger, M., Pain, G., and Weber, R. (2014). Development of an improved empirical model for slant delays in then troposphere (GPT2w). GPS Sol.","DOI":"10.1007\/s10291-014-0403-7"},{"key":"ref_19","first-page":"25","article-title":"ERA-Interim: New ECMWF reanalysis products from 1989 onwards","volume":"110","author":"Simmons","year":"2007","journal-title":"ECMWF Newsl."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"553","DOI":"10.1002\/qj.828","article-title":"The ERA-Interim reanalysis: Configuration and performance of the data assimilation system","volume":"137","author":"Dee","year":"2011","journal-title":"Q. J. R. Meteorol. Soc."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"15787","DOI":"10.1029\/92JD01517","article-title":"GPS meteorology: Remote sensing of atmospheric water vapor using the global positioning system","volume":"97","author":"Bevis","year":"1992","journal-title":"J. Geophys. Res."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"803","DOI":"10.1029\/RS009i010p00803","article-title":"An improved equation for the radio refractive index of air","volume":"9","author":"Thayer","year":"1974","journal-title":"Radio Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1029\/RS022i003p00379","article-title":"Estimation of Tropospheric Delay for Mircowaves from Surface Weather Data","volume":"22","author":"Askne","year":"1987","journal-title":"Radio Sci."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1175\/1520-0450(1994)033<0379:GMMZWD>2.0.CO;2","article-title":"GPS meteorology: Mapping zenith wet delays onto precipitable water","volume":"33","author":"Bevis","year":"1994","journal-title":"J. Appl. Meteorol. Clim."},{"key":"ref_25","first-page":"719","article-title":"Estimating mean weighted temperature of the atmosphere for Global Positioning System applications","volume":"102","author":"Ross","year":"1997","journal-title":"J. Geophys. Res."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/10\/11\/1718\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:27:09Z","timestamp":1760196429000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/10\/11\/1718"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,10,31]]},"references-count":25,"journal-issue":{"issue":"11","published-online":{"date-parts":[[2018,11]]}},"alternative-id":["rs10111718"],"URL":"https:\/\/doi.org\/10.3390\/rs10111718","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,10,31]]}}}