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本文将实测地物波谱、彩色红外航片密度测量和地面同步调查结果相结合,分析了农作物的彩色红外航片影象标志及稳定性。结果表明:(1)由于物候节律和群落外貌的差异,各种农作物的光谱反射率在量值上有差异,使得其在彩色红外正片影象上(黄/青)密度比差异显著,可以识别;(2)受盐碱危害的作物品红层密度变化明显,受浸涝危害的作物青层密度变化明显;(3)小麦拔节前后,丰产型、一般型和低产型麦田可以运用负片的[(黄+品红)/青]密度值来识别。这是一个较早获取小麦长势信息的较好时段。
In this paper, we combine the measured object spectrum, the color infrared aerial density measurement and the ground synchronization survey results to analyze the crop color infrared aerial image sign and its stability. The results showed as follows: (1) Spectral reflectance of various crops differed in magnitude due to the difference of phenological rhythm and community appearance, which resulted in significant difference in density ratio (yellow / green) on the color infrared positive film images, which could be identified ; (2) The density of magenta layer in crops harmed by salinity is obviously changed, and the densities of green layer in crops harmed by waterlogging are obviously changed; (3) Before and after jointing of wheat, high yield, general and low yield can be used [ (Yellow + magenta) / blue] density value to identify. This is a good time to get the wheat growth earlier.