Retrieval of Aerosol Optical Depth Using the Empirical Orthogonal Functions (EOFs) Based on PARASOL Multi-Angle Intensity Data
Abstract
:1. Introduction
2. Methodology
2.1. A Brief Introduction to the Covariance Matrix
2.2. The Estimation of Surface Intensity Contribution
2.3. Retrieval of AOD
3. Results and Validation
3.1. Case Study over East China
3.2. Validation Against AERONET
4. Discussion
4.1. EOFs for Surface Contribution Estimation
4.2. The Potential of EOFs in Polarized Measurements
4.3. The Potential of EOFs in Other Remote Sensing Dimensions
4.4. The Limitation of EOFs in Aerosol Retrieval
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
Appendix A
Class | Parameters | ||||||
---|---|---|---|---|---|---|---|
mr | mi | C | |||||
1 | 1.483 | 0.0078 | 0.1089 | 0.535 | 0.9801 | 0.568 | 0.05 |
2 | 1.5465 | 0.0130 | 0.1202 | 0.6135 | 0.9724 | 0.6022 | 0.13 |
3 | 1.485 | 0.0088 | 0.0939 | 0.531 | 0.9826 | 0.583 | 0.20 |
4 | 1.537 | 0.0023 | 0.0659 | 0.619 | 0.9618 | 0.531 | 0.43 |
5 | 1.5393 | 0.0129 | 0.0845 | 0.6157 | 0.8287 | 0.6126 | 0.53 |
6 | 1.528 | 0.0148 | 0.0839 | 0.5406 | 0.7476 | 0.6281 | 0.60 |
7 | 1.468 | 0.0102 | 0.0896 | 0.504 | 0.9269 | 0.618 | 0.76 |
8 | 1.482 | 0.009 | 0.0902 | 0.474 | 0.6229 | 0.656 | 0.82 |
9 | 1.4853 | 0.0095 | 0.095 | 0.5246 | 0.7958 | 0.6451 | 0.90 |
10 | 1.5465 | 0.013 | 0.1202 | 0.6135 | 0.9724 | 0.6022 | 0.99 |
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AERONET Sites | AERONET AOD Mean | Retrieved AOD Mean | MAE |
---|---|---|---|
Beijing | 0.260 | 0.287 | 0.073 |
Xianghe | 0.264 | 0.288 | 0.074 |
Taihu | 0.361 | 0.328 | 0.079 |
Hongkong_PolyU | 0.234 | 0.226 | 0.058 |
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Zhang, Y.; Li, Z.; Qie, L.; Hou, W.; Liu, Z.; Zhang, Y.; Xie, Y.; Chen, X.; Xu, H. Retrieval of Aerosol Optical Depth Using the Empirical Orthogonal Functions (EOFs) Based on PARASOL Multi-Angle Intensity Data. Remote Sens. 2017, 9, 578. https://doi.org/10.3390/rs9060578
Zhang Y, Li Z, Qie L, Hou W, Liu Z, Zhang Y, Xie Y, Chen X, Xu H. Retrieval of Aerosol Optical Depth Using the Empirical Orthogonal Functions (EOFs) Based on PARASOL Multi-Angle Intensity Data. Remote Sensing. 2017; 9(6):578. https://doi.org/10.3390/rs9060578
Chicago/Turabian StyleZhang, Yang, Zhengqiang Li, Lili Qie, Weizhen Hou, Zhihong Liu, Ying Zhang, Yisong Xie, Xingfeng Chen, and Hua Xu. 2017. "Retrieval of Aerosol Optical Depth Using the Empirical Orthogonal Functions (EOFs) Based on PARASOL Multi-Angle Intensity Data" Remote Sensing 9, no. 6: 578. https://doi.org/10.3390/rs9060578