GNSS meteorological ensemble tools (GMET): a free-access online service for GNSS meteorological applications
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Date
2024-10
Publication Type
Journal Article
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Abstract
The signal delay caused by the troposphere layer plays a key role in many applications. It is not only a significant error source in space geodetic techniques such as GNSS and InSAR, but also a valuable data product in meteorological applications, such as climate research and weather forecasting. Hence, the community needs key troposphere-related parameters and models to support data processing, for correcting tropospheric delays or retrieving water vapor content. For this purpose, the GNSS Meteorological Ensemble Tools (GMET) online service (http://gmet.users.sgg.whu.edu.cn) was developed, constituting three modules and using state-of-art methods and data sources. The module for custom products is defined by a specific user input and generates various parameters, including meteorological parameters, mapping function coefficients, and tropospheric corrections for specific regions or sites using numerical weather models (NWMs) or radiosonde data. The module for model products is designed to distribute gridded products via File Transfer Protocol (FTP). Finally, the tropospheric parameter monitoring module provides visualizations of routinely processed zenith tropospheric delay (ZTD) products from about 500 GNSS stations. To facilitate online services, we describe here algorithms and strategies used for the product generation and data processing. All the services are free and open to all users, and feedback from users is welcome for continuing service improvements.
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published
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Journal / series
Volume
28 (4)
Pages / Article No.
202
Publisher
Springer
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Software
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Subject
GNSS meteorology; Atmospheric water vapor; Tropospheric delay; Online service