For eliminating above influence, the data fusion between leaf density and imaging distance was processed by using BP artificial neural network and data fusion model.

为了消除上述影响，根据数据融合系统模型，采用BP人工神经网络对树叶稀密程度与成像距离进行数据融合处理。

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The density of water molecules within the leaf is typically 60 times greater than the density of carbon dioxide in the air, and the diffusion rate of the water molecule is greater than that of the carbon-dioxide molecule.

WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide