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Proceedings Paper

Snow wetness estimation in Himalayan snow covered regions using ENVISAT-ASAR data
Author(s): Gulab Singh; Vijay Kumar; Kishor Mohite; G. Venkatraman; Y. S. Rao; . Snehmani
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Paper Abstract

The snow wetness in the Himalayan snow covered region is an important parameter, for the snow melt runoff modeling and forecasting. The main objective of the study is to estimate snow wetness in parts of Himalayan snow covered regions. Snow surface backscattering can expressed as function of permittivity of snow. Reflectivity at the air snow interface increases greatly with wetness and volume scattering decreases abruptly. ENIVISAT-ASAR dual polarization (HH and VV) data have been used to investigate permittivity and snow wetness in sub Himalayan region. Raw data have been processed for backscattering coefficient (BSC) image generation for HH and VV polarization. BSC image is georeferenced and topographically corrected using high precision digital elevation model (DEM). The BSC images are despeckled using adaptive filter technique. For this study Physical optics Model (POM) for surface scattering based inversion model has been used. Physical Optics Model based inversion model gives the permittivity which can be further related for estimating snow wetness. A comparison was done between inversion model estimated snow wetness and field values of snow wetness in the study region. Comparison with field measurement showed that the correlation coefficient for snow wetness estimated from ASAR data was 0.8 at 95% confidence interval. The snow wetness ranges from 0-15% by volume.

Paper Details

Date Published: 14 December 2006
PDF: 12 pages
Proc. SPIE 6410, Microwave Remote Sensing of the Atmosphere and Environment V, 641008 (14 December 2006); doi: 10.1117/12.693690
Show Author Affiliations
Gulab Singh, Indian Institute of Technology Bombay (India)
Vijay Kumar, Indian Institute of Technology Bombay (India)
Kishor Mohite, Indian Institute of Technology Bombay (India)
G. Venkatraman, Indian Institute of Technology Bombay (India)
Y. S. Rao, Indian Institute of Technology Bombay (India)
. Snehmani, RDC, Snow & Avalanche Study Establishment (India)

Published in SPIE Proceedings Vol. 6410:
Microwave Remote Sensing of the Atmosphere and Environment V
Azita Valinia; Seiho Uratsuka; Tapan Misra, Editor(s)

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