一般情况下,小麦等农作物能表示出两个方向的反射特性。因此,在进行测定时,随着太阳高度角和观测角的不同,其光谱反射率也随之变动。并且,随着在农作物配置以及观测对象种类的不同,其光谱反射率也是变化的。为 In general, crops such as wheat can show the reflection characteristics in two directions. Therefore, when the measurement is performed, the spectral reflectance changes with the difference between the solar elevation angle and the observation angle. Moreover, the spectral reflectance also varies with the type of crop being placed and the type of observation object. for