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双站数字摄像测量云高
OBSERVATION OF CLOUD BASE HEIGHT THROUGH DOUBLE LOCATION DIGITAL PHOTOGRAPHY SYSTEM
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摘要: 文章提出一种新的地基、双站数字摄像测量云高的方法, 采用两台数字摄像仪同时拍摄实时云图, 自动搜索两幅图像中相互匹配的特征区域, 通过计算特征区域之间的位移量来求取云高。将双站数字摄像云高测量系统与合肥骆岗机场激光测云仪进行对比, 结果较一致。通过对云高计算公式的误差分析确定了适于该系统进行测量的条件, 如基线长度应尽可能长, 但不宜超过200 m, 有效的云高测量视场角在±45°以内。此外还讨论了该方法的优点和局限性。Abstract: It is an extremely important and valuable work to develop advanced remote sensing system of macrophysical and microphysical cloud characters.A new method is proposed to observe cloud base height through g round-based double location dig ital photography system.In this system, cloud height is calculated in real time from displacement between two matching templates which are automatically searched from two all-sky nephog rams.Consistency is show n between cloud heights observed through double location and those through lidar in Luogang airport of Hefei.According to measurement error of cloud height, the observation should be performed under the preferential observing condition with baseline length as long as possible but less than 200 m, and angle of view variable in ±45°.Furthermore, the excellence and limitation of this method are discussed.
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Key words:
- Cloud Height;
- Double location;
- Digital photography;
- Image analysis
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图 7 测量误差与云高、入射光线视场角及基线长度的关系图
(a)误差与入射光线视场角ω以及基线长度的关系, (b)误差与云高z以及基线长度d的关系图(设匹配误差为两个像素点, 即入射光线视场角误差为0.08°)
表 1 系统参数
表 2 各区域云高以及平均云高
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