International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B7, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
Si m Rune it Son ) 
Sia ET IK SahShv + SiS 3 
1 
Sa1 = 5 San“ + (Saul: + Syn]? mt Sl 
1 
Sy = = (ISnnl” + ISl = Sri + Sel.) 
$235 = RSS h^ TR S Sun) 
S24 = Sahne T. Sin) 
S31 = R(ShnSon = SueSvo!) 
S32 = R(SpnSun” — SoS) 
Sas m RS Sup d Susp.) 
Sy = HsnnSue + 5150") 
$41 = 1(SnnSno + ShoSvv ) 
Saz = 1(SnnSon — ShvSvv ) 
Sas = 1 SppSyv. + SraSon À 
$44 = RS nn Sue x SpySyh ) 
Once these expressions are calculated, it is 
output on the GUI in the form of unsymmetric 
Stokes matrix (after normalization).This is 
followed by calculation of Stokes unit vector 
(2) for transmitted (T) and received(R) antenna. 
So 1 
5 S: cos 2,C0Sy 
cH $; dcos 2, Sin2g 
$4 sin2, 
The element SO is the total power in the wave. 
The element S1 represents the difference in 
energy between the two orthogonal components 
of the wave. The elements S2 and S3 jointly 
represent the phase difference between the two 
orthogonal components of the electric field. 
Backscattered power (P) is then calculated by 
the expression (3), for both Co-polarization and 
Cross polarization. 
{Poy} = s [K]S7 
In order to compute the Co-polarization and 
Cross polarization signatures, the above 
equation is used with values of Ellipticity (X) 
and Orientation( @ ) angles varying with 
increments of 5° (-45° to +45° for X and 0° to 
180° for @ ). The result is output on the GUI in 
the form of a table and 3D plot showing 
backscattered power at various ellipticity (X) 
and orientation (@) angles, for both polarization 
cases. 
  
  
  
  
  
  
Figure 2.3a: Polarization Response of Dihedral corner 
reflector obtained “Radar Polarimetry for Geoscience 
Applications” 
537 
  
  
  
  
   
RATS e 35 
% 
FOLARESATAN Duc KEE. 
  
  
  
  
  
  
  
  
  
Figure2.3b: Polarization Response of Dihedral corner 
reflector obtained from developed tool “POLSIC” 
From the above figures it is seen that the 
polarization response of a dihedral corner 
reflector generated by the developed tool 
“POLSIC” is similar to that provided in “Radar 
Polarimetry for Geoscience Applications”.The 
power axis in the developed tool changes 
dynamically with the zoom level. 
3. RESULTS AND DISCUSSION 
The urban classes considered in this study, to 
carry out the analysis include: Built up (within 
water body and within city), linear features like 
roads and bridge, vegetated land, open field, 
and water body. These targets were identified 
from the multipolarization RADARSAT-2 
imagery, using RAT 0.21 software. The RAT 
0.21 software is freeware radar processing 
software that has the facility to view the 
geocoded product, and provide information of 
the real coordinates for various points on the 
image, along with the amplitude and phase 
values of a point target in all the four 
polarization channels (HH, VV, HV, and VH). 
Using the ground truth data available for the 
study area, the accuracy check was carried out 
and it was found that the geocoding done by 
RAT 0.21software was accurate and the only 
difference was in the decimal value of the 
second's part. These targets were then verified