牛顿插值法在植被红边拟合中的应用

Application of Newton Interpolation on Fitting the Red Edge of Vegetation

植被的定量遥感是近年来研究的一个热点,而红边参数能够很好地反映植被的一些信息,是植被生理生化参数反演的一个重要指标。本研究基于数值分析学科引入牛顿插值法来拟合植被的红边曲线,通过光谱微分的手段求出红边的位置。结果表明,与传统的几种求红边位置的方法相比,牛顿插值法能高精度地求出红边的位置。用牛顿插值法拟合出3种不同植被的红边,得到红边位置,表明了牛顿插值法对植被反射光谱的敏感性。

Quantitative remote sensing of vegetation is a hot research in recent years. The red edge parameters can well reflect some vegetation＇s information, which is an important indicator of physiological and biochemical parameters in the inversion of vegetation. This study was based on the discipline of numerical analysis and introduced Newton interpolation to fit the vegetation red edge curve. Then the position of red edge was obtained by spectral differential. Comparing with several traditional methods, Newton Interpolation has advantages in fitting red edge accurately. Then Newton interpolation fitting three different vegetation red edge, red edge position to obtain, show sensitivity Newton interpolation method on vegetation reflectance spectra. Finally Newton interpolation method has many potential applications. Three different kinds of vegetation ＇s red edge are fitted by Newton interpolation,which shows Newton interpolation can reflect the vegetation ＇s spectra sensitivity.