SAR Analysis of Subsurface Saline Deposits in Vanished Lop Nur Lake
1. IGARSS 2011 SAR Data for Subsurface Saline Lacustrine Deposits Detection and Primary Interpretation on the Evolution of the Vanished Lop Nur Lake Xiaolin Bian, Yun Shao, Huaze Gong Institute of Remote Sensing Applications, Chinese Academy of Sciences
6. Field Works and Analysis Field investigation routes and sampling pit locations. (A, B and C are field routes in 2006 in black line; I 、 II and III are field routes in 2008 in blue line; red dots are sampling locations of 2008 field trip, which are mainly analyzed in this report.)
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8. Field Works and Analysis Moisture Moisture variation from surface to bottom of the lacustrine deposits at selected sampling pits
9. Field Works and Analysis Subsurface scattering mechanism illustration
10. Polarimetric Analysis and Results The co-polarization correlation Co-polarization correlation analysis for bright and dark region (Length of radius is co-polarization correlation coefficient; scattered angle of circumference stands for phase differences.)
11. Polarimetric Analysis and Results Degree of Polarization Degree of polarization for bright and dark regions Regions PMax PMin p (p = PMax - PMin) Bright I 0.74 0.46 0.28 Dark I 0.84 0.65 0.19 Bright II 0.75 0.48 0.27 Dark II 0.81 0.6 0.21 Bright III 0.71 0.41 0.3 Dark III 0.8 0.57 0.23
12. Polarimetric Analysis and Results Degree of Polarization (PMax, p) of bright and dark region (The dot and dash line means boundary of different regions randomly.)
13. Polarimetric Analysis and Results Shannon entropy (latest) Shannon entropy for bright and dark regions
14. Polarimetric Analysis and Results Shannon Entropy Shannon entropy is a sum of two contributions related to intensity and polarimetry. Shannon entropy and its intensity, polarimetric contributions maps HH, VV and HV polarization amplitude maps of RADARSAT-2 data
15. Polarimetric Analysis and Results Polarimetric decomposition Polarimetric decomposition results in single scattering, dihedral scattering and multiple scattering with Cloude decomposition based on ALOS-PALSAR data.
16. Polarimetric Analysis and Results Polarimetric decomposition Comparison of multiple scattering component of Cloude decomposition and salinity of subsurface medium, where R Square and standard deviation are also shown.
17. Polarimetric Analysis and Results Retrieved Salinity of subsurface lacustrine deposits based on the Cloude decomposition. It is found that subsurface salinity can well express the image feature of Lop Nur Lake shorelines, which indicates salinity making significant contribution to backscattering intensity on SAR image.
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