Integrating Latent Heat Flux Products from MODIS and Landsat Data Using Multi-Resolution Kalman Filter Method in the Midstream of Heihe River Basin of Northwest China
Abstract
:1. Introduction
2. Study Area and Data
2.1. Study Area and Ground Observations
2.2. Remotely Sensed Data
2.2.1. MODIS LE Product
2.2.2. Landsat-Based LE Product
3. Methodology
3.1. The MKF Method
3.2. Assessment Metrics
4. Results and Discussion
4.1. Integration of Satellite-Derived LE Products
4.2. Comparison before and after MKF
4.2.1. Spatial Assessment of the MKF Integration Performance
4.2.2. Evaluation of the MKF Performance Using Ground Observations
4.3. Discussion
4.3.1. Uncertainty Analysis
4.3.2. Superiority and Recommendation for the MKF integration
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A. Details of the MKF Method
Appendix A.1. Initialization
Appendix A.2. Fine-to Coarse Sweep
Appendix A.3. Coarse-to-Fine Sweep
Appendix B. Details of the MS-PT Algorithm Logic
References
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Observed Sites | Longitude | Latitude | Land Cover | Duration 1 |
---|---|---|---|---|
Zhangye wetland | 100.45° | 38.98° | wetland | 6/2012–12/2016 |
Shenshawo sandy desert | 100.49° | 38.79° | barren land | 6/2012–4/2015 |
Huazhaizi desert steppe | 100.32° | 38.77° | barren land | 6/2012–12/2016 |
Bajitan Gobi | 100.30° | 38.92° | barren land | 6/2012–4/2015 |
1 | 100.36° | 38.89° | cropland | 6/10/2012–9/17/2012 |
2 | 100.35° | 38.89° | cropland | 5/3/2012–9/21/2012 |
3 | 100.38° | 38.89° | cropland | 6/3/2012–9/18/2012 |
4 | 100.36° | 38.88° | cropland | 5/10/2012–9/17/2012 |
5 | 100.35° | 38.88° | cropland | 6/4/2012–9/18/2012 |
6 | 100.36° | 38.87° | cropland | 5/9/2012–9/21/2012 |
7 | 100.37° | 38.88° | cropland | 5/28/2012–9/18/2012 |
8 | 100.38° | 38.87° | cropland | 5/14/2012–9/21/2012 |
9 | 100.39° | 38.87° | cropland | 6/4/2012–9/17/2012 |
10 | 100.40° | 38.88° | cropland | 6/1/2012–9/17/2012 |
11 | 100.34° | 38.87° | cropland | 6/2/2012–9/18/2012 |
12 | 100.37° | 38.87° | cropland | 5/10/2012–9/21/2012 |
13 | 100.38° | 38.86° | cropland | 5/6/2012–9/20/2012 |
14 | 100.35° | 38.86° | cropland | 5/6/2012–9/21/2012 |
Daman (15) | 100.37° | 38.86° | cropland | 9/2012–12/2016 |
16 | 100.36° | 38.85° | cropland | 6/1/2012–9/17/2012 |
17 | 100.37° | 38.85° | cropland | 5/12/2012–9/17/2012 |
DOY | MOD16 VS Aggregated Landsat | |||||
---|---|---|---|---|---|---|
Before MKF | After MKF | |||||
Bias | RMSE | RMSE (%) | Bias | RMSE | RMSE (%) | |
177 | 1.13 | 32.99 | 38.60 | −1.22 | 5.37 | 6.29 |
185 | −4.83 | 28.57 | 39.53 | −7.49 | 11.35 | 15.70 |
193 | −11.06 | 24.05 | 35.18 | −13.12 | 16.25 | 23.77 |
217 | −8.42 | 24.77 | 28.09 | −11.52 | 17.17 | 19.48 |
225 | −8.20 | 29.64 | 31.97 | −10.51 | 13.50 | 14.57 |
233 | −11.93 | 35.58 | 49.92 | −13.10 | 17.60 | 24.69 |
241 | −10.32 | 35.92 | 49.81 | −11.30 | 17.16 | 23.79 |
249 | −9.16 | 24.56 | 52.83 | −10.33 | 14.46 | 31.11 |
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Xu, J.; Yao, Y.; Tan, K.; Li, Y.; Liu, S.; Shang, K.; Jia, K.; Zhang, X.; Chen, X.; Bei, X. Integrating Latent Heat Flux Products from MODIS and Landsat Data Using Multi-Resolution Kalman Filter Method in the Midstream of Heihe River Basin of Northwest China. Remote Sens. 2019, 11, 1787. https://doi.org/10.3390/rs11151787
Xu J, Yao Y, Tan K, Li Y, Liu S, Shang K, Jia K, Zhang X, Chen X, Bei X. Integrating Latent Heat Flux Products from MODIS and Landsat Data Using Multi-Resolution Kalman Filter Method in the Midstream of Heihe River Basin of Northwest China. Remote Sensing. 2019; 11(15):1787. https://doi.org/10.3390/rs11151787
Chicago/Turabian StyleXu, Jia, Yunjun Yao, Kanran Tan, Yufu Li, Shaomin Liu, Ke Shang, Kun Jia, **aotong Zhang, **aowei Chen, and **angyi Bei. 2019. "Integrating Latent Heat Flux Products from MODIS and Landsat Data Using Multi-Resolution Kalman Filter Method in the Midstream of Heihe River Basin of Northwest China" Remote Sensing 11, no. 15: 1787. https://doi.org/10.3390/rs11151787