OPTICAL MODELING OF AGRICULTURAL FIELDS AND ROUGH-TEXTURED ROCK AND MINERAL SURFACES

摘要

To improve the ability to utilize laboratory spectra for predicting or interpreting airborne scanner data, a search was made for two theore¬tical models, one to calculate the reflectance of plant canopies and the other to assess the effect of textural variations on the spectral emittance or reflectance of natural rock surfaces. Several models were reviewed, from which it was possible to select the types of models best suited for these applications. The selected plant canopy model, an extension of the Allea-Gayle- Richardson model, can be used to predict the bidirectional reflectance of a field crop from known laboratory spectra of crop components and approximate plant geometry (planting density and average horizontal and vertical component crosssections). It is applicable even to vegetative targets composed of multiple canopy layers.