摘要
地物特征与其光谱特征的关系是解译遥感影像的关键。利用地物光谱仪在实验室和上海“梦清园”人工湿地中,分别实测了不同盖度沉水植物苦草的反射光谱特征。结果表明随着苦草盖度的增加,其光谱反射率也相应增加,不同盖度苦草的光谱反射率差异主要表现在500～650nm和700～900nm波段范围。受水体环境影响,实验室模拟试验与室外控制试验测得的苦草光谱反射率差异主要表现在近红外波段(700～900nm)。分别将苦草的不同盖度与其在QuickBird多光谱遥感影像4个波段与盖度相关性最大波段处的光谱反射率进行回归分析,得到了较好的线性关系。应用回归分析得到的线性方程,可以根据测定的光谱反射率定量反演水体中的苦草盖度。研究结果可为监测沉水植物的高光谱遥感影像判读和解译分类提供技术支撑,为大尺度遥感监测沉水植物的分布和动态变化提供科学依据。
The relationship between land features and their spectral characteristics is a key for the interpretation of remote sensing images. In this study, the spectral characteristics of a submerged plant Vallisneria spiralis with varied coverage were measured with a ground sensor/radiometer, FieldSpec （tm） Pro JR spectroradiometer in the laboratory and in a constructed wetland ＂Mengqingyuan＂, Shanghai. The results showed that the reflectance rate of Vallisneria spiralis increased with its increasing coverage, which exhibited both at the visible band （500 ～ 650 nm） and the near infrared band （700 ～ 900nm）. The water quality influenced the reflectance rate and the primary differences between the laboratory and field experiments mainly occurred at the near-infrared band （700 ～ 900 nm）. A regression analysis was carried out between the coverage of Vallisneria spiralis and the reflectance rate at the wavelengths of Quick Bird 4 bands where the coverage responded the strongest, respectively. These results of regression analyses showed a clear linear relationship, and by which the coverage of Vallisneria spiralis could be quantitatively deduced from the reflectance rate measured in situ. The implications of this in terms＇ of the ability of hyperspectral remote sensing to distinguish and monitor the distribution and dynamics of submerged vegetation on a large scale are discussed.
出处
《生态学报》
CAS
CSCD
北大核心
2006年第4期1005-1011,共7页
Acta Ecologica Sinica
基金
国家高技术研究发展863计划资助专项(2003AA601020)
国家"十五"与"211工程"重点学科建设资助项目~~
关键词
沉水植物
苦草
盖度
光谱反射率
地物光谱仪
submerged plant
Vallisneria spiralis
coverage
reflectance rate
spectroradiometer
