地面不同物体对日光的反射光谱是存在明显差异的。但是,对于航空摄影的一般全色像片来说,因为人的眼睛充其量不过能分辨3—4级黑度,所以不可能充分发挥出像片的判读潜力。最近几年,一些国家出现了多光谱摄影技术,这是一种用几台摄影机分别光谱段,对同一摄影对象同时摄影,然后将拍摄到的几张底片用光学技术合成彩色影像的方法。 There are significant differences in the reflectance spectrum of sunlight on different objects on the ground. However, for a general panchromatic photograph of aerial photography, it is impossible to give full play to the interpretation potential of the photograph because the human eye can at best distinguish the level 3-4 blackness. In recent years, multispectral photography has emerged in some countries. It is a method of photographing the same subject simultaneously by using several cameras in a spectral band, and then synthesizing several color images by optical techniques.