Neutral point separation method for polarized effect between land objects and atmosphere in polarization remote sensing

Taixia WU; Qingxi TONG; Pellikka PETRI; Chunmin ZHANG; Lei YAN

doi:10.11834/jrs.20187365

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Neutral point separation method for polarized effect between land objects and atmosphere in polarization remote sensing
Vol. 22, Issue 6, Pages: 980-988(2018)
Received：03 September 2017，

Accepted：25 September 2017，

Published：2018-11
DOI： 10.11834/jrs.20187365
稿件说明：

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吴太夏, 童庆禧, Petri Pellikka, 张淳民, 晏磊. 2018. 大气中性点区域偏振效应的地—气参量研究. 遥感学报, 22(6): 980–988 DOI： 10.11834/jrs.20187365.

Wu T X, Tong Q X, Petri P, Zhang C M and Yan L. 2018. Neutral point separation method for polarized effect between land objects and atmosphere in polarization remote sensing. Journal of Remote Sensing, 22(6): 980–988 DOI： 10.11834/jrs.20187365.

摘要

随着中国多颗偏振遥感器搭载发射，偏振遥感成为对地观测领域一个新的增长点以及研究热点。由于大气散射具有较强的偏振效应，大气与地表偏振信号的分离是偏振对地进行有效观测和应用的一个现实问题与难点问题。本文利用晴空中有规律的偏振分布以及大气偏振中性点的性质，对利用大气中性点的偏振效应进行地表—大气偏振信息分离的可行性进行了论证。通过对大气中性点在辐射传输过程性质的计算，得出Babinet大气中性点区域的偏振效应以及基于Babinet中性点区域进行偏振对地观测的基本方法，研究重点阐述了从航空遥感和航天遥感两个层面对如何将大气中性点应用于遥感观测进行了讨论。结果表明：(1)Babinet中性点相比于其他两个中性点，更适合于偏振遥感对地观测中地—气偏振参量分离；(2)航空遥感搭载偏振传感器在Babinet中性点区域进行地表探测可以消除大气偏振，突出地物偏振信息，有效进行地—气偏振参量分离；(3)在太阳同步轨道的卫星遥感影像上能够有效识别偏振中性点区域；研究成果有效分离高分辨率偏振遥感地物反演中的大气偏振耦合效应，实现地表偏振反射信息最大化，对于偏振遥感的大气校正以及定量化水平的提升具有实践意义。

Abstract

Presently

polarized remote sensing

along with numerous polarized remote sensors equipped for satellites emission in China

becomes a new growth point and research hot spot in the field of earth observation. The polarization information of land objects is a valuable source for remote sensing. However

land surface object polarization information received by the polarimeter is constantly submerged in the atmospheric polarization effect. Consequently

the primary goal is to find a means to eliminate or reduce the atmospheric polarization effects when using the polarization remote sensing for land surface detection. In this paper

we demonstrated the feasibility of the neutral point separation method for polarized effect between land objects and atmosphere in the polarization remote sensing through the regular polarization distribution of clear sky and nature of the atmospheric polarization neutral points. The polarized effect of the Babinet neutral point was obtained by calculating the atmospheric neutral points in ascending and descending radiations. We discussed the detailed technology of applying the neutral point for polarization remote sensing based on the basic method of using Babinet points for polarization earth observation from two aspects of aerial and satellite remote sensing. The results show that (1) the Babinet neutral point is suitable for the separation method of the polarized effect between land objects and atmosphere in the polarization remote sensing. (2) The aerial remote sensing detection at the Babinet neutral point can eliminate the atmospheric polarization to effectively highlight the polarized information. (3) The solar synchronous orbit

POLDER satellite remote sensing images

can also identify the polarization neutral area effectively. (4) These results are a type of method for reducing the atmospheric error source in the polarization remote sensing to the lowest possible value and then obtaining the polarized reflectance of land object maximized from this atmospheric window of the polarization remote sensing. This approach separates the atmospheric polarization coupling effect in the high-resolution quantitative remote sensing inversion. These research results are practically significant for the atmospheric correction and improvement of the quantification level of polarized remote sensing.

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