Field Measurement of Spectral Reflectance Factor of Wheat by Using a Portable Spectroradiometer

Abstract

The spectral reflectance factor of wheat was measured using a portable spectroradiometer-a newly developed instrument used collecting useful ground truth data for remote sensing.
(1) The ratio of reflectance facter between IR and R, (ie. IR/R), in May and June were found to be closely related with the wheat yield.
(2) The chang of the ratio, IR/R, from May to June was useful in estimating the growth stage of wheat.
(3) Red reflectance factor was found to be closely correlated to the moisture content of wheat, and the reflectance factor at the end of July was considered an indicater of maturity of wheat.