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
- Other Titles
- 인공위성 다중편파 X-밴드 영상레이더를 이용한 눈/얼음피복지역에서의 위상간섭 긴밀도 평가 연구
- Hong, Sang-Hoon
- Issue Date
- Hong, Sang-Hoon, Don Atwood, Shimon Wdowinski. 2016. Evaluation of interferometric coherence oversnow/ice-covered areas with space-based quadruplepolarimetric X-band synthetic aperture radar. 2016 한국지구물리 물리탐사학회 추계학술대회. 극지연구소. 2016.10.06~2016.10.07.
- 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 한국지구물리 물리탐사학회 추계학술대회
- Conference Place
- Conference Date
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