基于模板匹配的云底高度估计
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国家自然科学基金资助项目(41205125;41575020)


Cloud base height estimation based on template matching
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    摘要:

    本文提出一种将主动卫星遥感云底高数据扩展到被动遥感卫星视场的新方法。在分析云顶高度(CTH)和云水路径(CWP)对云垂直分布影响的基础上,提出用CTH和CWP两项参数为基的模板匹配法,结合加权最近邻插值估计云层厚度,并用成熟的CTH反演产品减去云层厚度,得到云底高度(CBH)。然后引入小波去噪的方法抑制对云底高度估计的局部高频涨落。与基于云类型的估计方法相比,该方法在20~300km范围内与其估计效果相当,且在170~240km范围内误差更小。考虑到基于云类型的估计方法在CloudSat卫星和MODIS云分类结果上存在差异,本文方法的适用性更好。

    Abstract:

    In this paper, a new method that extends the Cloud Base Height(CBH) retrieved by active satellite to the passive satellite sensor field was put forward. Based on the analysis of the effects of Cloud Top Height(CTH) and Cloud Water Path(CWP) on the cloud vertical distribution, a template matching method basing CTH and CWP parameters was developed, moreover, combined with the weighted nearest neighbor interpolation, the cloud thickness was estimated. Furthermore, the CBH was retrieved through using the mature CTH product minus cloud thickness. The wavelet transform was introduced to restrain the local high frequency fluctuations. Compared with the cloud types based method, the performance of the new method is close to the estimated effects at the distance of 20-300 km and shows less estimaton error at the distance of 170-240 km. Considering the differences of cloud classification results between CloudSat and MODIS, this new method is more adaptable.

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李浩然,孙学金,刘磊,张日伟.基于模板匹配的云底高度估计.气象科学,2015,35(5):610-615 LI Haoran, SUN Xuejin, LIU Lei, ZHANG Riwei. Cloud base height estimation based on template matching. Journal of the Meteorological Sciences,2015,35(5):610-615

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  • 收稿日期:2014-05-08
  • 最后修改日期:2014-09-13
  • 在线发布日期: 2015-11-13
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