Analysis of the Characteristics of GPS Precipitable During
a Large Area of Rainfall in Hong Kong
1 School of Environmental Science and Spatial Informatics,China University of Mining and Technology,1 Daxue Road,
Xuzhou 221116, China
2 Donghua Geologic Engineering and Construction Company of Yanzhou Mining Group, 1029 Dongtan Road, Zoucheng 273500, China
Abstract：Based on precipitable water vapor data as received from GPS and weather data from The Hong Kong Observatory in Hong Kong on March 30, 2014, this paper analyzes variations in precipitation over a large area. The results show that heavy rainfall may occur before GPS precipitable peak, and the mutation phenomenon of GPS precipitable may or may not occur before the rain. The complexity of Hong Kong’s terrain is an important factor affecting GPS precipitation variations, as is the effective range of single base stations to obtain the distribution of water vapor. The timing diagrams of GPS precipitable contours can be used to visually analyze water vapor transmission.