Evaluation of interferometric coherence oversnow/ice-covered areas with space-based quadruplepolarimetric X-band synthetic aperture radar
- Evaluation of interferometric coherence oversnow/ice-covered areas with space-based quadruplepolarimetric X-band synthetic aperture radar
- Hong, Sang-Hoon
- Issue Date
- Hong, Sang-Hoon, Wdowinski, Shimon, Atwood, Don. 2016. Evaluation of interferometric coherence oversnow/ice-covered areas with space-based quadruplepolarimetric X-band synthetic aperture radar. 2016 fall meeting of Korean Society of Earth and Exploration Geophysicists. ChungJu. 2016.10.06.-07.
- Coherent space-based InSAR observations over snow/ice-covered areas have been very
useful resources for detecting glacier movements. Coherence is considered a critical
parameter for evaluating the quality of an InSAR observation. This study evaluates
interferometric coherence using quadruple polarimetric TerraSAR-X (TSX) X-band
observations, which were acquired during Dual Receive Antenna campaign period in 2010.
We used a total of 57 TSX quad polarization images acquired at latitude higher than 60
degrees north. The coherence analysis of the entire study areas yield high coherence
levels in all polarization modes from 0.38 to 0.57, with highest values in VV, then HH,
and lowest in HV. It is very surprising that the short wavelength X-band SAR
observations can maintain such a high coherence level over snow/ice-covered surfaces.
Because it was assumed that the shorter X-band wavelength radar signal can be
significantly decorrelated by quickly changing surfaces like snow/ice-covered or vegetated
regions. It is interesting that the highest coherence value was found in the VV-pol,
because in most scattering environments, HH-pol coherence is the highest. We conducted
a comparative coherence analysis by analyzing additional 25 TSX images acquired over
six different scattering environments (classes) and compared their coherence
characteristics. The scattering six classes are: forest, agriculture, wetland, sea-ice,
snow/ice, and urban area. Our results show highest VV-pol coherence in snow/ice,
sea-ice, and some agriculture and forest environments, whereas highest HH-pol
coherence values are found in urban, wetland and some agriculture and forest
environments. In forest and agricultural environments, both HH-pol and VV-pol show
similar degree of coherence. In summary, our results indicate that VV-pol is preferable
for X-band InSAR applications over the snow/ice-covered areas.
- Conference Name
- 2016 fall meeting of Korean Society of Earth and Exploration Geophysicists
- Conference Place
- Conference Date
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