基于无人机高光谱的太浦河水质反演

doi:10.13474/j.cnki.11-2246.2024.0406

摘要/Abstract

摘要： 为了快速掌握太浦河水环境分布状况,本文以太浦河典型河段为试验区,基于无人机高光谱数据和实测水质数据构建悬浮物浓度、浊度、透明度等水质参数的数学统计模型,并进行精度评价,选取评价精度最高的模型对太浦河水质进行反演与分析。结果表明:①与悬浮物浓度、浊度和透明度相关性最高的高光谱波段为880～900 nm,悬浮物浓度和浊度与各高光谱波段反射率相关性变化趋势一致,透明度与各高光谱波段反射率相关性绝对值变化趋势与前两者保持一致。②悬浮物浓度反演模型中,比值指数模型效果最佳(试验集R²=0.91,验证集RMSE=27.04 mg/L,验证集MAPE=47.04%);浊度反演模型中,同样为比值指数模型效果较好(试验集R²=0.92,验证集RMSE=16.50 NTU,验证集MAPE=15.24%);透明度反演模型中,归一化指数模型反演效果最佳(试验集R²=0.85,验证集RMSE=2.43 cm,验证集MAPE=8.38%)。综合比较3种水质参数的反演效果可知,透明度反演效果最佳,浊度次之,最后为悬浮物浓度。③反演的太浦河悬浮物浓度呈现总体偏低、东部部分区域偏高的特点;浊度总体呈现东部较高、西部次之、中部最低的特点;透明度总体呈现西高东低的特点,西部和中部透明度较高,东部透明度显著降低。

关键词: 无人机, 高光谱, ASD, 太浦河, 水质反演

Abstract: In order to quickly and comprehensively grasp the water environment status of Taipu River,this study takes part of Taipu River as the test area,builds mathematical statistical models of three water quality parameters,including suspended matter concentration,turbidity and transparency,based on UAV hyperspectral data and measured water quality data,and then carries out accuracy evaluation. The model with the highest evaluation accuracy is selected to invert and analyze the water quality of Taipu River. The results show that: ①The hyperspectral band with the highest correlation with suspended matter concentration,turbidity and transparency is about 880～900 nm,and the correlation trend of suspended matter concentration and turbidity is consistent with the reflectance of each hyperspectral band,while the correlation trend of absolute value between transparency and reflectance of each hyperspectral band is consistent with the previous two. ②In the inversion model of suspended matter concentration,the ratio index model has the best effect (test set R²=0.91,validation set RMSE=27.04 mg/L,validation set MAPE=47.04%). And in the turbidity inversion model,the ratio index model has the best effect (test set R²=0.92,validation set RMSE=16.50 NTU,validation set MAPE=15.24%). The normalized index model has the best inversion effect among transparency inversion models (test set R²=0.85,validation set RMSE=2.43 cm,validation set MAPE=8.38%). By comparing the inversion effects of the three water quality parameters,we can see that the inversion effect of transparency is the best,followed by turbidity,and finally the concentration of suspended matter. ③The inverted suspended matter concentration of Taipu River is generally low,while the eastern part is high. Turbidity is generally high in the eastern part,followed by the western part,and lowest in the central part. Transparency is generally high in the western and central part,and lowest in the eastern part.

Key words: UAV, hyperspectral, ASD, Taipu River, water quality inversion

中图分类号:

P237

梁文广, 吴勇锋, 石一凡, 王冬梅, 王轶虹. 基于无人机高光谱的太浦河水质反演[J]. 测绘通报, 2024, 0(4): 29-34.

LIANG Wenguang, WU Yongfeng, SHI Yifan, WANG Dongmei, WANG Yihong. Inversion of Taipu River water quality parameters by UAV hyperspectral imaging technology[J]. Bulletin of Surveying and Mapping, 2024, 0(4): 29-34.

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