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ENVISAT-ASAR data analysis for snow cover mapping over gangotri region - art. no. 641007

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Title ENVISAT-ASAR data analysis for snow cover mapping over gangotri region - art. no. 641007
 
Creator RAO, YS
VENKATARAMAN, G
SINGH, G
 
Subject snow cover area
envisat-asar
registration
threshold
 
Description Snow cover area (SCA) mapping is very important parameter for snowmelt runoff modeling and forecasting. Snow cover information is also useful for managing transportation and avalanche forecasting. For SCA mapping, we selected Gangotri area and ENVISAT ASAR swath-2 data sets acquired during 2003-2004. The ASAR SLC data are converted into backscattering coefficient. The backscattering coefficient images are co-registered, multi-looked and geocoded using freely available DORIS InSAR software package. Out of available images during 2 years, Nov. 2003 image was taken as a reference image to form a ratio image with respect to others. Snow covered and non-snow areas are classified using threshold value (less than -3 dB is considered as snow) based on change detection method as given by Nagler and Rott. This value is shifted to -2dI3 to match with the classified snow cover area from optical data of IRS-1D. With five pairs of ratio images we could observe seasonal change of snow. The problem with the technique is that it can not be used with different ASAR mode data. The threshold value also depends on the location of the area.
 
Publisher SPIE-INT SOC OPTICAL ENGINEERING
 
Date 2011-10-24T03:22:30Z
2011-12-15T09:11:24Z
2011-10-24T03:22:30Z
2011-12-15T09:11:24Z
2006
 
Type Proceedings Paper
 
Identifier Microwave Remote Sensing of the Atmosphere and Environment V,6410,41007-41007
978-0-8194-6517-7
0277-786X
http://dx.doi.org/10.1117/12.693845
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15317
http://hdl.handle.net/100/2042
 
Source Conference on Microwave Remote Sensing of the Atmosphere and Environment V,Goa, INDIA,NOV 15-16, 2006
 
Language English