The Effect and Method of Quantitative Analysis of "Red Edge"of Vegetation

The abrupt change in the 680nm～800nm region of reflectance spectra of leaves caused by the combined effects of strong chlorophyll absorption and leaf internal scattering is called the red edge and on the reflectance spectrum of vegetation between red and near-infrared wavelengths,termed the red edge position(REP).It is also the point as the maximum first derivative of the reflectance spectrum.In this paper it summarizes the red edge parameter types and their application in identify the plant and seasonal appearance of plant,in estimation of parameters of plant,in estimation status of plant,and summarizes the application areas and methods of application.It explains the importance of linear interpolation model to the plant study in remote sensing.The inverted Gaussian model,Lagrangian model,higher order polynomial model,Rational function(new) model are summarized for location of the red edge,and also summarized conditions of their application.At mean time it introduces a new method,named Rational function(new) for location of the red edge.Finally,which method can be adopted for locating the red edge in case of chlorophyll concentration will be left for further investigation.