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王艳红,邓正栋,马荣华.基于实测光谱与MODIS数据的太湖悬浮物定量估测[J].环境科学学报,2007,27(3):509-515
基于实测光谱与MODIS数据的太湖悬浮物定量估测
- Suspended solids concentration estimation in Lake Taihu using field spectra and MODIS data
- 基金项目：国家自然科学基金项目(No.40671138);江苏省自然科学基金青年科技创新人才学术带头人项目(No.BK2004422);中科院领域前沿项目(No.CXNIGLAS-A02-014)
- 作者
- 单位
- 王艳红
- 1. 解放军理工大学气象学院, 南京 211101; 2. 解放军理工大学工程兵工程学院, 南京 210007
- 邓正栋
- 解放军理工大学工程兵工程学院, 南京 210007
- 马荣华
- 中国科学院南京地理与湖泊研究所, 南京 210008
- 摘要：以太湖为研究区域,对太湖水体的水面反射光谱进行实地测试,并取样在实验室进行水质分析;根据光谱分析得到的悬浮物特征波段,估测悬浮物浓度;最后,对比MODIS波段,用最敏感波段及主成分分析法建立悬浮物估测模型.结果表明,576nm附近的反射率峰值、841nm处反射率一阶微分值和808nm附近的反射峰高与悬浮物浓度都有较好的相关性,其中峰高法和一阶微分法对悬浮物浓度的估测精度相当;MODIS波段1与悬浮物浓度相关性最好,经过主成分变化后的第一主成分和第二主成分可以较好地估测悬浮物浓度.因此,可利用MODIS数据对太湖悬浮物进行长期动态监测.
- Abstract：Taking Lake Taihu as the study area, the field reflectance spectrum was measured, and the in-situ water samples were collected and analyzed in the lab. After analyzed the spectrum features, suspended solids (SS) concentration were estimated by field spectra. Then by the comparison of the bands of MODISand the correlation between SSand MODISbands reflectivity, the principal component analysis (PCA) were analyzed. The most practicable band, the first and the second principal component were selected to educe the estimation models. The results show that the peak value near 576nm, the peak height near 808nm, and the first derivative at 841nm have good correlations with SSconcentration. Among these, the estimation precisions of the two later are close. The correlation between MODISband 1 and SSconcentration is more corresponding than the other bands. The precisions to estimate SSusing the first and the second principal component are also good. Therefore, MODISdata can be used in long term dynamic monitoring of SSconcentration in Lake Taihu.
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