Global Navigation Satellite System (GNSS) Troposphere Zenith Path Delay (ZPD) product (Version 1) from NASA CDDIS
This derived product set consists of version 1 of the Global Navigation Satellite System Final Troposphere Zenith Path Delay (ZPD) Product (daily files by station) from the NASA Crustal Dynamics Data Information System (CDDIS). GNSS provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Analysis Centers (ACs) of the International GNSS Service (IGS) retrieve GNSS data on regular schedules to produce troposphere ZPD estimates for stations of the IGS network. The primary troposphere products generated from ground-based GNSS data are estimates of total zenith path delay and north/east troposphere gradient. Ancillary measurements of surface pressure and temperature allow the extraction of precipitable water vapor from the total zenith path delay. The IGS Troposphere Analysis Center Coordinator (ACC) used these individual AC solutions to generate the official version 1 of the IGS troposphere ZPD estimates for many of the stations in the IGS network. The final products consisted of daily files containing data from each observing station. All ZPD solution files utilize the Solution INdependent EXchange format for combination of TROpospheric estimates (SINEX_TRO) and span 24 hours from 00:00 to 23:45 UTC. In late 2006, a new version of the troposphere combination has been generated by the IGS Troposphere Analysis Center Coordinator. More information about the new version can be found under collection CDDIS_GNSS_IGSTroposphereZPD_product.
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| Spatial Extent: | n/a |
Data Format(s): | n/a |
| Temporal Extent: | Platform(s): | GLONASS, GPS, GROUND STATIONS | |
| Data Center(s): | NASA/GSFC/SED/ESD/GGL/CDDIS | Instrument(s): | GLONASS P, GPSP, GNSS |
| Version: | 1 | ||
- GENERAL DOCUMENTATION: https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/GNSS_product_holdings.html, URL for more information about GNSS derived products
Collection Information
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Purpose
Water vapor, a key element in the hydrological cycle, is an important atmosphere greenhouse gas. Monitoring long-term changes in its content and distribution is essential for studying climate change. The inhomogeneous and highly variable distribution of the atmospheric water vapor also makes it a key input to weather forecasting. Ground-based GNSS observations produce continuous estimates of vertically integrated water vapor content with high temporal resolution over a global distribution of land-based locations. Water vapor can be estimated from space-borne GNSS receivers using ray tracing techniques, in which case solutions with high vertical resolution (laterally integrated over few hundred kilometers); these solutions however are discontinuous in geographic location and time. -
DOI
10.5067/GNSS/GNSS_IGSTROPZPDV1_001
http://dx.doi.org/
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Data Identification
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Processing Level
2
Derived products from GNSS data
- Quality
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Collection Progress
Active
Data Dates
| Creation |
Related URLs
Acquisition Information
Projects
| Project Short Name | Campaigns | Project Dates |
|---|---|---|
| IGS | No campaigns listed. | Start: 1992-01-01 |
Temporal Information
Temporal Keywords
- 1 second - < 1 minute
Spatial Information
Location Keywords
- GEOGRAPHIC REGION
- GLOBAL
Data Centers
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NASA/GSFC/SED/ESD/GGL/CDDIS
ARCHIVER, DISTRIBUTORCrustal Dynamics Data Information System, Geodesy and Geophysics Laboratory, Earth Sciences Division, Sciences and Exploration Directorate, Goddard Space Flight Center, NASA
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NASA GSFC
Code 61A
Greenbelt, Maryland 20771
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Data Contacts
There are no listed data contacts for this collection.