Table 1. Snow distribution statistics. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Target Snow Snow-Water 
Depth (cm) Equivalent (cm) 
MIN. MAX. AVG. MIN. MAX. AVG. 
BI 47 138 67.6 12 31 20.4 
B2 62 150 97.8 12 34 28 
B3 45 113 57.2 10 26 12.9 
B4 44 136 90.5 11 38 24.5 
BS 118 122 120 22 25 23.3 
GI 60 90 74.8 11 21 14.3 
G2 44 104 72.2 7 22 14.4 
G3 68 102 87.3 17 25 22.1 
G4 31 93 61.8 7 31 17.4 
G3 56 108 90.6 ll 28 20.4 
. TFA 81 123 99.9 17 32 26.9 
Table 2. Incidence angles (degrees) 
Nadir Mode Narrow Mode 
30" 60" 
33175 33316 33175 33316 
Target. |C-HH. X-HHC-VV. X-VV|C-HH. C-HV C-VH. C-VV | C-HH, X-HH |C-VV, X-VV | C-HH, C-HV C-VH, C-VV 
Bl 29.45 41.41 35.71 33.73 58.88 59.78 59.83 50.29 
B2 30.06 41.77 36.15 34.19 59.05 60.03 60 59.55 
B3 27.84 40.31 34.34 32.18 58.15 59.29 59.28 58.75 
B4 29.21 41.59 35.93 33.73 58.88 59.78 59.96 59.29 
B5 28.34 40.03 34.8 32.54 58.93 59.82 59.71 59.42 
GI 34.97 46.01 40.45 38.57 60.87 61.55 61.48 61.27 
G2,3 4 34.54 45.78 40.05 38.05 60.56 61.26 61.33 61.19 
G5 34.54 45.75 40.36 38.37 60.75 61.52 61.56 61.19 
TFA 32.3 43.92 38.62 36.66 60.12 60.96 61.02 60.43 
  
  
can vary on a short distance. Our general observation is 
that raw DN-s of C-band VV polarization provides about the 
same result as the data of HH polarization. We also 
concluded that the averaging filter (3 by 3 kernel) provides 
poorer results than the use of raw DN-s. The data analysis 
between SWE and the combined C- and X-bands and C- 
band snow-free and snow-covered data is not completed at 
the time of the preparation of this paper. However, the 
Intemational Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 
results will be available by the presentation of the paper in 
September. 
CONCLUSIONS 
At the time of the initiation of the project, very limited 
information was available in the literature concerning the 
prediction of SWE using SAR data (NASA, 1981). We 
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