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GPS zenith tropospheric delay (ZTD) variability in the Mediterranean
Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy, 2001Abstract In the context of the MAGIC project (Meteorological Applications of GPS Integrated Column Water Vapor Measurements in the Western Mediterranean), zenith tropospheric delays (ZTD) are computed from Global Positioning System (GPS) signals at permanent sites in the western Mediterranean area continuously since November 1998.
Haase, J., Vedel, H., Ge, M., Calais, E.
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Prediction of ZTD Based on ANFIS Model
2015Since the tropospheric delay plays a crucial role in meteorological studies and weather forecasts as well as positioning accuracy, accurate prediction of its value is critical to helping monitoring the ZTD variation on a global basis. In the previous chapter, ZTD has been estimated with a fuzzy inference system that uses a back-propagation algorithm ...
Wayan Suparta, Kemal Maulana Alhasa
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Ground-GNSS ZTD trends for climate models
GNSS Zenith Total Delay (ZTD) estimates are quantities of great interest by climate modellers since atmospheric water vapour is the major greenhouse gas. Therefore, the importance of its accurate, long-term monitoring and evaluation of trends and variability, potentially serving as independent benchmarks to climatological models, both on longer trends ...Marcelo C. Santos +17 more
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AtmospherePrior tropospheric information, especially zenith tropospheric delay (ZTD), is particularly important in GNSS data processing. The two types of ZTD models, those that require and do not require meteorological parameters, are the most commonly used models,
Fei Yang
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Consistency and Homogeneity of ZTD Estimates from IGS Repro3
In 2019-2020, the International GNSS Service (IGS) coordinated its third reanalysis of the complete history of GNSS data collected by the IGS global network since 1994. Ten analysis centers (ACs) participated in this so-called “Repro3” effort, using the latest models and methodologies. Several of them provided, among other products,Hugo Breton +2 more
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Characterisation and Mitigation of Outliers in IGS repro3 GNSS ZTD Products
Abstract We evaluate the quality of zenith tropospheric delay (ZTD) estimates from four IGS Analysis Centres (ACs) – COD, GFZ, GRG, and TUG – participating in the third IGS reprocessing campaign (repro3). This study focuses on outliers, defined as estimates outside the 1–3 meter range.Hugo Breton +10 more
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Apparent Short-Period GNSS-ZTD Disturbance Correlated With Precipitation Events
IEEE Geoscience and Remote Sensing Letters, 2022Yongchao Ma +3 more
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Understanding and reducing ZTD outliers in GNSS PPP-derived products
Zenith Total Delay (ZTD) estimates derived from GNSS observations are essential for atmospheric and geodetic applications. When processed using Precise Point Positioning (PPP), ZTD time series exhibit enhanced stability compared to network-based approaches.Breton, Hugo +6 more
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A novel regional drought monitoring method using GNSS-derived ZTD and precipitation
Remote Sensing of Environment, 2023Qingzhi Zhao, Yibin Yao
exaly
IEEE Transactions on Geoscience and Remote Sensing, 2023
Chenhao Ouyang, Chaoqian Xu, Junbo Shi
exaly
Chenhao Ouyang, Chaoqian Xu, Junbo Shi
exaly