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Remote Sensing for Land & Resources    2019, Vol. 31 Issue (1) : 101-109     DOI: 10.6046/gtzyyg.2019.01.14
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Retrieval of concentration of total suspended matter from GF-1 satellite and field measured spectral data during flood period in Poyang Lake
Chen GAO, Jian XU(), Dan GAO, Lili WANG, Yeqiao WANG
School of Geography and Environment Science & Ministry of Education’s Key Laboratory of Poyang Lake Wetland and Watershed Research, Jiangxi Normal University, Nanchang 330022, China
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Abstract  

Total suspended matter is one of the important parameters to evaluate water quality. In this study, 33 data samples containing reflectance of water surface, concentration of total suspended matter and chlorophyll-a were used to conduct retrieval of total suspended matter, establish retrieval model and verify accuracy of model based on comparative analysis between field measured spectral reflectance and total suspended matter in Poyang Lake during the flood season. These models were single band, first-order differential and band ratio, respectively. The results showed that the R 2 of three models was greater than 0.9, and the best was the single band model, and R 2, RMSE and MRPE were 0.9805, 3.78mg/L and 16.99%, respectively. The single band model gave the better performance when it was applied to GF-1 satellite image data on August 3, 2015 and was validated, with R 2, RMSE and MRPE being 0.8477, 12.23mg/L and 35.22%, respectively. It was also shown that the overall level of suspended matter concentration was low and the average value was 23.26mg/L. The higher value of total suspended matter was concentrated in the northern channel area. The concentration values of suspended matter was distributed uniformly in other areas of Poyang Lake. This model was further applied to GF-1 satellite image data on October 24, 2015 and was validated using 21 data samples of total suspended matter concentration obtained on October 23 and October 24, 2015. The retrieval accuracy was close to the result of image on August 3, 2015. The results indicate that this model can be also applied to retrieving the total suspended matter concentration of other periods in Poyang Lake. By analysis of field measured spectral reflectance and application of remote sensing image data, this study can provide reference for the retrieval of total suspended matter and environment monitoring of Poyang Lake.

Keywords total suspended matter concentration      retrieval method      GF-1 satellite data      field measured water spectra      Poyang Lake     
:  TP79  
Corresponding Authors: Jian XU     E-mail: jianxu@jxnu.edu.cn
Issue Date: 15 March 2019
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Chen GAO
Jian XU
Dan GAO
Lili WANG
Yeqiao WANG
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Chen GAO,Jian XU,Dan GAO, et al. Retrieval of concentration of total suspended matter from GF-1 satellite and field measured spectral data during flood period in Poyang Lake[J]. Remote Sensing for Land & Resources, 2019, 31(1): 101-109.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2019.01.14     OR     https://www.gtzyyg.com/EN/Y2019/V31/I1/101
Fig.1  Location of Poyang Lake and samples
采样
时间		 区域(采样
点个数)		 水质参数 最小值 最大值 平均值
20150801 D(8) Chl-a/(mg·m-3) 3.63 9.70 6.16
TSM/(mg·L-1) 5.20 11.80 7.63
浊度/NTU 5.50 11.50 7.51
20150802 B(10) Chl-a/(mg·m-3) 1.06 12.99 7.03
TSM/(mg·L-1) 6.20 79.00 16.84
浊度/NTU 4.30 109.00 20.29
20150803 A(9) Chl-a/(mg·m-3) 0.65 5.42 3.06
TSM/(mg·L-1) 31.40 55.80 43.91
浊度/NTU 39.40 67.50 52.53
20150805 C(6) Chl-a/(mg·m-3) 3.84 20.54 5.91
TSM/(mg·L-1) 9.80 98.40 34.57
浊度/NTU 8.00 118.10 33.43
总(33) Chl-a/(mg·m-3) 0.65 20.54 5.55
TSM/(mg·L-1) 5.20 98.40 24.76
浊度/NTU 4.30 118.10 30.65
Tab.1  Characteristics of water quality parameters in the Poyang Lake
Fig.2  Spectral reflectance curve of Poyang Lake water
Fig.3  Correlation coefficients for normalized remote sensing reflectance with TSM concentration of water
Fig.4  Measured reflectance spectra in Poyang Lake
反演方法 自变量 模型表达式 R2
单波段 R(707) y = 234 016x3-1 587.9x2+772.22x+2.520 5 0.980 5
一阶微分 R(777)-R(775)777-775 y = 2×1013x3-2×109x2+565 942x+4.188 0.968 1
波段比值 R(717)R(401) y = 8.616 6x3-47.114x2+127.39x-88.009 0.959 3
Tab.2  Total suspended matter concentration retrieval models in three methods
Fig.5  Comparison between measured and estimated the total suspended matter concentration
Fig.6  Comparison between the Band3 reflectance of GF-1 imagery and measured reflectance
Fig.7  Comparison between retrieved and measured the total suspended matter concentration based on single band model using GF-1 data (August,2015)
Fig.8  Spatial distribution map of suspended matter concentration of Poyang Lake in August 2015
采样时间 区域(采样点个数) 最小值 最大值 平均值
20151023 A(10) 68.00 111.60 92.68
20151024 B(11) 1.60 84.40 29.22
总(21) 1.60 111.60 59.44
Tab.3  The 21 data samples of total suspended matter concentration for model validation(mg/L)
Fig.9  Comparison between retrieved and measured the total suspended matter concentration based on single band model using GF-1 data (October,2015)
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