双光谱云图的云分类探讨

RESEARCH ON THE CLOUD CLASSIFICATION FOR THE BI-SPECTRUM CLOUD PICTURE

依据各类云在红外和可见光波段不同的光谱特性，考察了近百个数字云图样本，在红外—可见光二维光谱特征空间上基本确定了与各类云相应的集群分布范围，由此判识出积雨云、薄卷云、厚卷云、中云、低云、浓积云和多层云系等７种主要云类及晴空区。并以１９９０年３月１５日１４时云因为例进一步讨论了诸云类在光谱特征空间上高频数分布区的形状和分布特点。

Nearly one hundred digitized cloud picture samples have been examined based onspectral characteristics at different bands of infrared and visible lights for all kinds of clouds. In the infrared-visible light 2D spectra characteristic space are determined the location of lo- cation of cloud grouping distribution corresponding to the type of clotid from which the sevenmain cloud system including cumulonimbus. thin/thick currus. middle andlow-level eloud,cumulus congestus and multilevel cloud system and the clear sky area have been recognized.Further research has been made on the pattern and form of the various clouds in the high fre-quency distribution area in the characteristic space.