Abstract
Precipitable water vapor (PWV) in the atmosphere is essential for weather forecast. Currently, correct determination of PWV is a big concern to those talking interest in hydrometeorology. In this paper, we present the algorithms for determining PWV and then compare between PWV derived from radiosonde observation data and PWV derived from GPS data at Tan Son Hoa Station, Ho Chi Minh City. The deviations between the two PWV values in this study, are less than 1.2mm. In addition, PWV values changed in accordance with changes of weather on the surveying days.
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