地球同步衛(wèi)星資料的一種云地分離綜合處理技術(shù)

doi:10.3969/2012jms.00**

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地球同步衛(wèi)星資料的一種云地分離綜合處理技術(shù)
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P407.8
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An integrated processing technique on the detachment of cloud from the earth's surface using synchronous meteorological satellite data

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摘要:

利用多通道地球同步衛(wèi)星資料，采用多通道閾值、基于晴空合成底圖和云圖時(shí)間序列的閾值和相似檢測(cè)、有限區(qū)域動(dòng)態(tài)閾值檢測(cè)等方法，運(yùn)用分步?jīng)Q策思路，對(duì)（60 °S～60 °N、45～165 °E）區(qū)域內(nèi)衛(wèi)星云圖分中高云和低云進(jìn)行云地分離綜合處理。經(jīng)人工判斷與自動(dòng)云地分離結(jié)果對(duì)比分析表明，準(zhǔn)確率達(dá)到90%以上。分析表明，考慮云和地(海)表在不同通道的亮溫差異和隨時(shí)間演變特點(diǎn)，建立并運(yùn)用多種云地分離方法，有利于云地分離信息量的增加；提出的考慮云系分布時(shí)變特性的相似檢測(cè)法，以及從有云和無(wú)云兩個(gè)角度優(yōu)先選擇高可信度方法逐步檢測(cè)，有利于云地分離準(zhǔn)確率的提高。

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Based on the decision tree method, an integrated processing technique on the detachment of cloud from the earth's surface with FY-2C multi-channel satellite data is performed step by step using three different measures, including the threshold method of multi-channel, the threshold method of similar test on time series of composed cloud/surface map derived from clear sky, and the limited regional dynamic threshold method. Experiments are made to fulfill the detachment of cloud map from the earth surface in the area of 60 S～60°N, 45°E～165°E with FY-2C meteorological satellite data in July of 2005. In contrast with manual estimation, the detachment made by the computer automatically presents an accuracy rate over 90%. The analysis results show that, when taking the differences of the brightness temperature between the clouds and the earth surface (or the sea surface) into account as well as the characteristics of their temporal evolvements in different channels, the establishing and applying of multi methods on the cloud-surface detachment will be helpful to increase the quantity of information in detaching. These two approaches suggested in the paper—the similar test method which considers the varying characteristics with time of the clouds, and the stepwise test method which prefers to higher reliability under cloudy or non-cloudy circumstances—will be in favor of the detachment and its accuracy.

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王昌雨,孔玉壽,強(qiáng)學(xué)民,李利國(guó).地球同步衛(wèi)星資料的一種云地分離綜合處理技術(shù).氣象科學(xué),2011,(1):40-45 Wang Changyu, Kong Yushou, Qiang Xuemin, Li Liguo. An integrated processing technique on the detachment of cloud from the earth's surface using synchronous meteorological satellite data. Journal of the Meteorological Sciences,2011,(1):40-45

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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说