SAR interferometric coherence analysis for snow cover mapping in the western Himalayan region

作     者：Vijay Kumar Gopalan Venkataraman 

作者机构：Centre of Studies in Resources EngineeringIndian Institute of Technology BombayPowaiMumbai 400076India 

出 版 物：《International Journal of Digital Earth》 (国际数字地球学报（英文）)

年 卷 期：2011年第4卷第1期

页      面：78-90页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

主　　题：SAR InSAR coherence snow cover digital earth microwave remote sensing 

摘      要：Information of snow cover(SC)over Himalayan regions is very important for regional climatological and hydrological *** monitoring of SC in the Himalayan region is essential for water supply to hydropower stations,irrigation requirements,and flood *** remote sensing has all weather,day and night earth observation capability unlike optical remote *** this study,spaceborne synthetic aperture radar interferometric(InSAR)coherence analysis is used to monitor SC over Himalayan rugged *** feasibility of monitoring SC using synthetic aperture radar(SAR)interferometry depends on the ability to maintain coherence over InSAR pair acquisition time ***-1/2 InSAR coherence and ENVISAT ASAR InSAR coherence images are analyzed for SC *** sets of winter and of snow free months of the Himalayan region are taken for interferogram *** images of the available data sets show maximum decorrelation in most of the area which indicates massive snowfall in the region in the winter season and melting in the *** showing coherence loss due to decorrelation is mapped as a snowcovered *** result is validated with field observations of snow depth and it is found that standing snow is inversely related to coherence in the Himalayan region.