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Two Geometrical Problems in Cloud Motion Wind Algorithm
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摘要: 文章分析了云迹风计算工作中所遇到的两个几何问题，即图像匹配问题和风矢量计算问题。图像匹配问题是指用于计算云迹风的两幅图像如果定位网格不一致，如何通过图像匹配来减少云迹风的计算误差。风矢量计算问题是指在已得到示踪云位置时，如何准确地求出风向风速。云迹风的计算在本质上是一个几何问题，几何处理周密是减少云迹风计算误差的一个重要途径。Abstract: Mapping correction and wind vector calculation in cloud motion wind algorithm were discussed. If geographical matching between images is not accurate, mapping correction can amend systematic errors caused by satellite movement relative to the earth. Wind vector calculation based on an ellipsoidal earth was also described. The formulas for wind vector calculation are simple and accurate. Cloud motion wind calculation is essentially a geometrical issue. Careful consideration at geometric issue is an important approach to error reduction.
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