红边是绿色植物在680nm～740nm之间反射率增高最快的点，也是一阶导数光谱在该区间内的拐点。 红边的描述包括红边的位置和红边的斜率
避让标志牌是白底红边三角形。
A yield sign is a triangle with a white background and a red border.
停速行驶车辆标志是有红边的橙色三解形标志。
穗光谱的红边位置象冠层、叶片光谱一样也存在“蓝移”现象；
There were 'blue shift' phenomena for the position of red edge of the spectra of ear as that of canopy and leaves.
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