Aucun titre de diapositive

1
Resolution effects on Polarimetric high
resolution X band data Franck Garestier (1),
Pascale Dubois-Fernandez (1), Xavier Dupuis (1),
and Philippe Paillou (2) (1) ONERA, BA 701
Ecole de lAir, 13661 Salon AIR, France (2)
Observatoire Aquitain des sciences de lUnivers,
2, rue de lObservatoire, 33270 Floirac, France
Resolution influence on polarimetric information
Polarimetric parameters difference histogram on
the whole image for a, H and
A. Resolutions R 1.125m 1.5m
2.25m 4.5m
On the whole image Diminution of entropy H and
augmentation of anisotropy A scattering
mechanism removal a angle increase filtering of
a pure surface scattering component
z
TP A H a
SHH

• On urban areas
• a angle wide dispersion
• different scattering mechanism from surface to
  double
• bounce scattering are removed
• local augmentations of entropy H
• where the first contribution (a1) is double
  bounce, resolution
• degradation leads to the increases of the
  apparent probability
• of the surface scattering component P2 and the
  associated a2

• On bare soil surfaces
• 5 a angle augmentation
• entropy H decrease
• the first apparent probability P1 corresponding
• to the first scattering mechanism becomes more
• important and a1 increases when resolution is
• degraded meaning that a part of the pure surface
• scattering contribution removed

Resolution degradation on SAR images
Resolution in range direction with , the
light speed, the bandwidth of the emitted
chirp Resolution in azimuth direction where
is the platform velocity, is the
conserved Doppler bandwidth