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About Other Data Types
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Balloon Data
Rawinsonde (balloon) precipitable water is calculated from pressure and dew point temperature measurements made as a balloon travels from the surface to the top of its trajectory, typically about 100 mb. Temperature, pressure, and humidity data for the first observation may be plotted for comparison with surface met parameters measured at the GPS-IPW site.
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UNB3 Delay Model Predictions
The UNB3 model for the signal delay predictions is derived in part from the 1966 U.S. Standard Atmosphere Supplements. It was validated by comparing to ray-traced radiosonde measurements of the signal delay obtained from 173 stations in North America between 1987-1996. The UNB3 model was developed by the University of New Brunswick for the FAA-WAAS program and provides predictions of both the hydrostatic and wet components of the zenith signal delay. These would normally be mapped to a specific elevation angle by the model, however the zenith wet delay component can be directly compared to the corresponding estimate from the NOAA/GSD GPS-IPW sites. The model input parameters are day-of-year, elevation angle, height and latitude.
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Checkout
IPW estimates from these sites is being currently being evaluated for correctness.
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Experimental
These sites were used as part of a scientific data collection campaign. Therefore, current data from these sites are most likely not available.
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Removed
These sites have been decommisioned. Therefore, current data from these sites are most likely not available.
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