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Snow wetness estimation in Himalayan snow covered regions using ENVISAT-ASAR data - art. no. 641008

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Title Snow wetness estimation in Himalayan snow covered regions using ENVISAT-ASAR data - art. no. 641008
 
Creator SINGH, G
KUMAR, V
MOHITE, K
VENKATRAMAN, G
RAO, YS
SNEHMANI
 
Subject synthetic-aperture radar
sir-c/x-sar
backscattering
density
ghz
physical optics model (pom)
envisat-asar
permittivity
backscattering coefficient
dual polarization
digital elevation model
snow wetness
 
Description 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&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 geo-referenced 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.
 
Publisher SPIE-INT SOC OPTICAL ENGINEERING
 
Date 2011-10-24T03:17:47Z
2011-12-15T09:11:23Z
2011-10-24T03:17:47Z
2011-12-15T09:11:23Z
2006
 
Type Proceedings Paper
 
Identifier Microwave Remote Sensing of the Atmosphere and Environment V,6410,41008-41008
978-0-8194-6517-7
0277-786X
http://dx.doi.org/10.1117/12.693690
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15316
http://hdl.handle.net/100/2041
 
Source Conference on Microwave Remote Sensing of the Atmosphere and Environment V,Goa, INDIA,NOV 15-16, 2006
 
Language English