Polarimetric Techniques for Characterization of Glacial Feature
255
procedure [1]. The log function is applied to the radar image to produce a normal distribution of
values. Because bright values are moved towards the mean and dark values are extended over a
broader color range, it converts pixel values into a logarithmic scale, resulting in higher contrasts [15].
σ
o
= 20 log
10
(X) – k+ 10 log
10
(sinθ
local
/ sinθ
center
), (11.1)
where X is the pixel value, k denotes the calibration constant in dB, θ
local
denotes the local incidence
angle, and θ
center
denotes the nominal incidence angle at the scene center.
11.4.2 sCattering matrix
Polarimetry ...
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