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| 基于POLDER/PARASOL的中国典型地表偏振特性研究 | |
| 其他题名 | Analyzed polarized reflectance model of typical surface types over China based on the POLDER/PARASOL measurements |
| 相坤生 | |
| 出版年 | 2016 |
| 学位类型 | 硕士 |
| 导师 | 程天海 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 相对于传统的光学遥感，多角度偏振遥感不仅可以获取辐射强度信息，而且可以获取偏振强度信息。本文首先基于POLDER/PARASOL偏振遥感数据，研究了多角度偏振观测数据的大气校正，从森林、草地、沙漠三种地物做了验证；然后开展了不同偏振反射率模型（Breon物理模型、Nadal-Breon经验模型、Maignan et al. 单参数模型、Litvinov et al. 模型）对典型地物偏振特性的适用性分析；最后基于偏振反射率模型研究了中国区域森林、草地、沙漠三种典型地物的多角度偏振特性。主要包括三个方面：1）POLDER/PARASOL数据的大气校正。基于矢量辐射传输模型RT3生成的查找表，以及MODIS气溶胶产品对POLDER/PARASOL偏振遥感数据开展大气校正。分别从森林、草地、沙漠三种典型地物做了大气校正，并基于PARASOL二级地表参数产品对校正结果做了验证。结果表明校正后的偏振反射率与二级地表参数产品有较好的相关性，其中校正后的森林地表偏振反射率相对误差10.46%，草地地表偏振反射率相对误差为7.34%，沙漠地表偏振反射率相对误差为7.22%。2）不同地表偏振反射率模型的适用性分析。基于POLDER/PARASOL大气校正后的数据，拟合得到了四种偏振反射率模型（Breon物理模型、Nadal-Breon经验模型、Maignan et al. 单参数模型、Litvinov et al. 模型）的参数值。在此基础上，研究分析了各地物不同偏振反射率模型的适用性。研究表明：1）Litvinov et al. 模型对森林地物的拟合效果最好，线性斜率大于0.9， R2在0.8以上；2）Nadal-Breon模型对各地物的拟合线性斜率与R2均在0.8以上；3）Maignan et al. 单参数模型对沙漠和草地的拟合线性斜率与R2在0.9以上; 4) Breon模型模拟效果最差。3）基于地表偏振反射率模型的偏振特性研究。基于拟合得到的地表偏振反射率模型参数值，研究了中国区域森林、草地、沙漠三种典型地物的多角度偏振特性。研究表明：（1）各地物的偏振反射率均随着散射角的增大而减小，随着太阳天顶角和卫星观测天顶角的增大而增大；（2）森林、草地和沙漠三种典型地表偏振反射率存在明显差别，森林地表偏振反射率最低，草地的偏振反射率次之，沙漠的偏振反射率大约为森林的1.5倍；（3）不同地物之间的偏振反射率差值均随着卫星观测天顶角和太阳天顶角的增大而增大。研究结果可为利用多角度偏振遥感数据探测地面类型的物理特性及定量反演地表大气参数提供理论基础。 |
| 英文摘要 | The multi-angle polarization remote sensing can obtain the intensity of polarization information compared with the traditional optical remote sensing. In this paper, firstly, the atmospheric correction of multi-angle polarization observation data was analyzed based on the POLDER/PARASOL polarized Remote Sensing reflectance data. And the results were verified from three kinds of objects in the forest, grassland and desert. Then, the sensitivity analysis was carried out on the polarization characteristics of typical surfaces in different polarization reflectance models (Breon model, Nadal-Breon model, et al. Maignan single parameter model, et al. Litvinov model). Finally, multi-angle polarization characteristics of three typical surface features of forest, grassland and desert in China were studied based on the model of polarized reflectance.The main contributions of this dissertation are summarized as follows:1) Atmospheric correction of POLDER/PARASOL data. Atmospheric correction of POLDER/PARASOL polarized remote sensing data based on vector radiative transfer model RT3 generated look-up table and PARASOL two level aerosol products. Atmospheric correction is made from three typical features of forest, grassland and desert, and the correction results are verified based on the PARASOL two level surface parameter products. The results show that the correction of the polarization reflectance and the two level surface parameters products has a good correlation, the relative error of correction of forest is 10.46%, grassland relative error is 7.34%, relative error of the desert is 7.22%.2) Sensitivity analysis of different surface polarized reflectance models. The parameters of four types of polarization reflectance models (the Breon physical model, the Nadal-Breon semi-empirical model, the Maignan et al. single parameter model, and the Litvinov et al. model) were analyzed based on the POLDER/PARASOL observation of three typical features in China three sites (forest, grassland, desert). Subsequently, combined with the model analysis, the polarization reflectance characteristics of each typical feature were studied. The results reveal that (1) the imitative effect of the Litvinov et al. model about forest was the best, as the linear slope was greater than 0.9 and R2was better than 0.8; (2) the linear slope and R2of the Nadal-Breon model about all surfaces were higher than 0.8; (3) although fitting slope of the Maignan et al. model was bad under the forest(0.15 |
| 中文关键词 | 多角度偏振 ; POLDER/PARASOL ; 大气校正 ; 地表偏振反射率模型 ; 典型地表偏振特性 |
| 英文关键词 | multi-angle polarization POLDER/PARASOL，atmospheric correction， surface polarization reflectance models typical surface polarization properties |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 电子与通信工程 |
| 来源机构 | 中国科学院遥感与数字地球研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/287813 |
| 推荐引用方式 GB/T 7714 | 相坤生. 基于POLDER/PARASOL的中国典型地表偏振特性研究[D]. 中国科学院大学,2016. |
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