镜面反射对植被指数和植被覆盖度的影响及实验测量

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中图分类号：TB9；TP75

Abstract： Specular reflection and diffuse reflection are inseparable in most remote sensing images. Spectral vegetation indices are widely used to assess vegetation coverage and growth conditions.However，specular reflection may cause deviations in reflected data，thereby affecting the accuracy of vegetation indexes. Therefore，the issue of the impact of specular reflection on vegetation indexes is studied to improve the analysis accuracy of remote sensing data. Based on the analysis of the relationship between specular reflection and vegetation indexes and fractional vegetation cover， a vegetation multispectral measurement experimental system was built，and 2O vegetation spectral indexes were measured.The corresponding fractional vegetation cover was compared and analyzed based on the pixel dichotomy method. The research results show that specular reflection not only affects the narrowband of spectral vegetation indexes but also affects fractional vegetation cover， providing certain experimental basis and methodological foundation for improving the monitoring accuracy of vegetation indexes and determining the inversion of fractional vegetation cover.

Keywords： remote sensing; specular reflection; vegetation index

0 引言

植被指数（vegetationindex，VI）是通过遥感光谱数据定量表征地表植被覆盖特征的重要指标，该指标基于植物叶片与冠层在可见光与近红外波段的光谱反射特性差异[1]，结合经验或半经验模型构建而成，可有效反演植被覆盖度、生物量及生产力等[2-5]。（剩余12619字）