Snow density retrieval using SAR data: algorithm validation and applications in part of North Western Himalaya
P. K. Thakur1, R. D. Garg2, S. P. Aggarwal1, P. K. Garg2, Snehmani3, and J. Shi41Indian Institute of Remote Sensing (IIRS), Dehradun 4-kalidas road, 248001 Uttarakhand, India 2Indian Institute of Technology (IIT), Roorkee, 247667 Uttarakhand, India 3Snow and Avalanche Studies Establishment (SASE), Chandigarh Himparisar, Sector 37-A, 160017 Chandigarh, India 4Institute for Computational Earth System Science, Ellison Hall 6808, University of California, Santa Barbara, CA 93106, USA
Received: 08 Apr 2013 – Accepted for review: 22 Apr 2013 – Discussion started: 03 May 2013
Abstract. The current study has been done using Polarimetric Synthetic Aperture Radar (SAR) data to estimate the dry snow density in Manali sub-basin of Beas River located in state of Himachal Pradesh, India. SAR data from Radarsat-2 (RS2), Environmental Satellite (ENVISAT), Advanced Synthetic Aperture Radar (ASAR) and Advanced Land Observing Satellite (ALOS)-Phased Array type L-band Synthetic Aperture Radar (PALSAR) have been used. The SAR based inversion models were implemented separately for fully polarimetric RS2, PALSAR and dual polarimetric ASAR Alternate polarization System (APS) datasets in Mathematica and MATLAB software and have been used for finding out dry snow dielectric constant and snow density. Masks for forest, built area, layover and shadow were considered in estimating snow parameters. Overall accuracy in terms of R2 value and Root Mean Square Error (RMSE) was calculated as 0.85 and 0.03 g cm−3 for snow density based on the ground truth data. The retrieved snow density is highly useful for snow avalanche and snowmelt runoff modeling related studies of this region.
Thakur, P. K., Garg, R. D., Aggarwal, S. P., Garg, P. K., Snehmani, and Shi, J.: Snow density retrieval using SAR data: algorithm validation and applications in part of North Western Himalaya, The Cryosphere Discuss., 7, 1927-1960, doi:10.5194/tcd-7-1927-2013, 2013.