基于GF-1与实测光谱数据鄱阳湖丰水期总悬浮物浓度反演
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摘要
总悬浮物浓度是水质评价的重要参数之一。2015年8月,在鄱阳湖布设33个采样点,通过测量水面光谱和采集水样进行检测,获取水面遥感反射率、总悬浮物浓度和叶绿素a浓度等数据。结合实测水面遥感反射率数据与总悬浮物浓度的相关性分析,建立了单波段、一阶微分和波段比值3种反演模型,并分别进行了精度验证。研究发现,3种反演模型的拟合度(R2)均大于0. 9,其中单波段模型最优,其R2、均方根误差(root mean square error,RMSE)及平均相对误差(mean relative percentage error,MRPE)分别为0. 980 5,3. 78 mg/L和16. 99%。将该单波段模型应用于2015年8月3日的高分一号(GF-1)卫星影像数据,同样得到了较高的反演精度,R2,RMSE和MRPE分别为0. 847 7,12. 23 mg/L和35. 22%。结果表明,鄱阳湖丰水期总悬浮物浓度值总体偏低,平均值为23. 26 mg/L,高值主要集中在鄱阳湖北部通江河道及其以南的中部水域,其余水域分布较为均匀。利用2015年10月24日GF-1影像和准同步观测的21个采样点的总悬浮物浓度数据使用此模型做进一步验证,其反演精度接近于2015年8月影像验证结果,表明该模型能进一步推广应用到鄱阳湖不同时期总悬浮物浓度的反演。通过实测光谱的分析以及在遥感影像上的应用,可以为鄱阳湖总悬浮物浓度的反演以及环境监测提供参考。
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 R2 of three models was greater than 0.9,and the best was the single band model,and R2,RMSE and MRPE were 0.9805,3.78 mg/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 R2,RMSE and MRPE being 0.8477,12.23 mg/L and 35.22%,respectively.It was also shown that the overall level of suspended matter concentration was low and the average value was 23.26 mg/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.
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 R2 of three models was greater than 0.9,and the best was the single band model,and R2,RMSE and MRPE were 0.9805,3.78 mg/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 R2,RMSE and MRPE being 0.8477,12.23 mg/L and 35.22%,respectively.It was also shown that the overall level of suspended matter concentration was low and the average value was 23.26 mg/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.
引文
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[19]唐军武,田国良,汪小勇,等.水体光谱测量与分析I:水面以上测量法[J].遥感学报,2004,8(1):37-44.Tang J W,Tian G L,Wang X Y,et al.The methods of water spectra measurement and analysis I:Above-water method[J].Journal of Remote Sensing,2004,8(1):37-44.
[20]唐兆民,何志刚,韩玉梅.悬浮泥沙浓度的测量[J].中山大学学报(自然科学版),2003,42(s2):244-247.Tang Z M,He Z G,Han Y M,et al.The measurement on suspended sediment concentration[J].Acta Scientiarum Natyralium Universitatis Sunyatseni,2003,42(2):244-247.
[21]陈宇炜,陈开宁,胡耀辉.浮游植物叶绿素a测定的“热乙醇法”及其测定误差的探讨[J].湖泊科学,2006,18(5):550-552.Chen Y W,Chen K N,Hu Y H.Discussion on possible error for phytoplankton chlorophyll-a concentration analysis using hotethanol extraction method[J].Journal of Lake Science,2006,18(5):550-552.
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