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http://dx.doi.org/10.11108/kagis.2020.23.3.026

Research Trends on Estimation of Soil Moisture and Hydrological Components Using Synthetic Aperture Radar  

CHUNG, Jee-Hun (Dept. of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University)
LEE, Yong-Gwan (Dept. of Civil, Environmental and Plant Engineering, Graduate School, Konkuk University)
KIM, Seong-Joon (Division of Civil and Environmental Engineering, College of Engineering, Konkuk University)
Publication Information
Journal of the Korean Association of Geographic Information Studies / v.23, no.3, 2020 , pp. 26-67 More about this Journal
Abstract
Synthetic Aperture Radar(SAR) is able to photograph the earth's surface regardless of weather conditions, day and night. Because of its possibility to search for hydrological factors such as soil moisture and groundwater, and its importance is gradually increasing in the field of water resources. SAR began to be mounted on satellites in the 1970s, and about 15 or more satellites were launched as of 2020, which around 10 satellites will be launched within the next 5 years. Recently, various types of SAR technologies such as enhancement of observation width and resolution, multiple polarization and multiple frequencies, and diversification of observation angles were being developed and utilized. In this paper, a brief history of the SAR system, as well as studies for estimating soil moisture and hydrological components were investigated. Up to now hydrological components that can be estimated using SAR satellites include soil moisture, subsurface groundwater discharge, precipitation, snow cover area, leaf area index(LAI), and normalized difference vegetation index(NDVI) and among them, soil moisture is being studied in 17 countries in South Korea, North America, Europe, and India by using the physical model, the IEM(Integral Equation Model) and the artificial intelligence-based ANN(Artificial Neural Network). RADARSAT-1, ENVISAT, ASAR, and ERS-1/2 were the most widely used satellite, but the operation has ended, and utilization of RADARSAT-2, Sentinel-1, and SMAP, which are currently in operation, is gradually increasing. Since Korea is developing a medium-sized satellite for water resources and water disasters equipped with C-band SAR with the goal of launching in 2025, various hydrological components estimation researches using SAR are expected to be active.
Keywords
Synthetic Aperture Radar; Hydrological Components; Remote Sensing; Soil Moisture;
Citations & Related Records
Times Cited By KSCI : 12  (Citation Analysis)
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