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1982年至1983年,国家测绘局测绘科学研究所和中国民航工业航空服务公司联合研究了一种取得国土资源调查原始资料的新方法,这就是“大像幅多光谱航空摄影”,它的代号是18 MSP(18×18厘米像幅多光谱摄影)。多光谱航空摄影为什么要用大像幅地面上的各种物体,在阳光照射下都能反射不同的光线。譬如,春天的麦子多反射绿光,因而呈绿色;麦收季节,麦子多反射黄光,因而呈黄色。这就叫地物的光谱反射性能。不同的物体反射的光,颜色和强弱都有所不同。很多地物,尤其是植物,对人眼看不见的红外光也有强烈的反射。在红外光中,植物
From 1982 to 1983, the Institute of Surveying and Mapping of the State Bureau of Surveying and Mapping and CAAC jointly researched a new method of obtaining the original data of land and resources surveys, which is called “large image multi-spectrum aerial photography” Is 18 MSP (18 x 18 cm image multispectral photography). Multispectral aerial photography Why use a large variety of objects on the ground, in the sunlight can reflect different light. For example, the spring wheat reflects more green light and thus is green; the wheat harvest season reflects more yellowish yellow wheat. This is called the spectral reflectance of the ground object. Different objects reflect the light, color and strength are different. Many features, especially plants, also have a strong reflection of invisible infrared light. In infrared light, plants