Remote Sensing Technology and Application, Volume. 39, Issue 1, 98(2024)
Retrieving CODMn Concentration in Karst Plateau Deep Lake Reservoir Using Sentinel-2 Data
Figures & Tables(11)
Fig. 1. Spatial distribution of study area and in-situ sites in “Liang Hu”
Fig. 2. Remote sensing reflectance of MSI bands corresponding to CODMn in-situ locations
Fig. 3. Flowchart for CODMn concentration estimation of Karst Plateau Deep Lake Reservoir using Machine Learning methods
Fig. 4. Comparison of "Two Lakes" based on Sentinel-2 data's prediction results and actual measured values （training set）
Fig. 5. Comparison of "Two Lakes" based on Sentinel-2 data's prediction results and actual measured values （test set）
Table 1. The major specifications of Sentinel-2 MSI
View tableView in ArticleTable 1. The major specifications of Sentinel-2 MSI
波段 分辨率 Sentinel-2A/nm Sentinel-2B/nm 意义 /m 中心波长 带宽 中心波长 带宽 B1 60 443.9 27 442.3 45 监测近岸水体/大气气溶胶 B2 10 496.6 98 492.1 98 蓝、绿、红可见光波段 B3 10 560.0 45 559 46 B4 10 664.5 38 665 39 B5 20 703.9 19 703.8 20 红边监测植被健康信息 B6 20 740.2 18 739.1 18 B7 20 782.5 28 779.7 28 B8 10 835.1 145 833 133 近红外波段（宽） B8a 20 864.8 33 864 32 近红外波段(窄) B9 60 945.0 26 943.2 27 水蒸气波段 B10 60 1 373.5 75 1 376. 9 76 卷云波段(短波红外) B11 20 1 613.7 143 1 610.4 141 短波红外波段 B12 20 2 202.4 242 2 185.7 238
Table 2. Sentinel-2 （A and B） image references and sample dates
View tableView in ArticleTable 2. Sentinel-2 （A and B） image references and sample dates
采样日期 成像日期 Sentinel-2 (A/B)(.SAFE) 2018/4/12 2018/4/9 S2A_MSIL1C_20180409T032541_N0206_R018_T48RXQ_20180409T070457 2018/10/28 2018/10/31 S2A_MSIL1C_20191031T032851_N0208_R018_T48RXQ_20191031T062949 2019/4/10 2019/4/9 S2B_MSIL1C_20190409T032539_N0207_R018_T48RXQ_20190409T075904 2019/8/12 2019/8/17 S2B_MSIL1C_20190817T032539_N0208_R018_T48RXQ_20190817T081113 2019/10/31 2019/10/31 S2A_MSIL1C_20191031T032851_N0208_R018_T48RXQ_20191031T062949 2020/4/25 2020/4/28 S2A_MSIL1C_20200428T032541_N0209_R018_T48RXQ_20200428T062927 2020/8/20 2020/8/26 S2A_MSIL1C_20200826T032541_N0209_R018_T48RXQ_20200826T062908 2020/11/5 2020/11/14 S2A_MSIL1C_20201114T033011_N0209_R018_T48RXQ_20201114T062024
Table 3. Hyper parameters setting and results of cross-validation with Grid-Search
View tableView in ArticleTable 3. Hyper parameters setting and results of cross-validation with Grid-Search
方法 超参数 Grid-Search值 CODMn最终模型参数 RFR n estimators 10、20、50、100、200 50 min_samples_leaf 1、5、10、15 1 min_samples_split 2、5、10、15、25 10 max_depth 2、3、4、5、6、7、None None SVR C 1、2、5、10、25、50、120、256 256 gamma 24* np.logspace(-6, 6, num=12) 0.007 5 GPR n-restarts-optimizer 4、8、10、12、16、20、32、64 10
Table 4. Pearson correlation coefficients between MSI bands and in-situ CODMn
View tableView in ArticleTable 4. Pearson correlation coefficients between MSI bands and in-situ CODMn
波段 B1 B2 B3 B4 B5 B6 B7 B8A 相关系数 0.58 0.58 0.70 0.54 0.57 0.49 0.49 0.50
Table 5. Training set and validation set inversion results
View tableView in ArticleTable 5. Training set and validation set inversion results
波段 模型 训练集(49个) 验证集(21个) R2 RMSE(mg/L) MAPE
/%
R2 RMSE(mg/L) MAPE
/%
band SVR 0.61 0.39 12.67 0.57 0.37 9.36 RFR 0.93 0.17 5.64 0.84 0.22 5.84 GPR 0.57 0.41 13.81 0.50 0.39 10.24 logband SVR 0.67 0.36 11.40 0.69 0.31 8.57 RFR 0.93 0.17 5.83 0.80 0.25 6.57 GPR 0.59 0.40 13.29 0.56 0.37 10.21
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Jiao WANG, Wei LI, Weiquan ZHAO, Zulun ZHAO, Liang HUANG, Jiafang YANG. Retrieving CODMn Concentration in Karst Plateau Deep Lake Reservoir Using Sentinel-2 Data[J]. Remote Sensing Technology and Application, 2024, 39(1): 98
Paper Information
Category: Research Articles
Received: Jun. 22, 2022
Accepted: --
Published Online: Jul. 22, 2024
The Author Email: WANG Jiao (wj410804806@gmail.com)
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