【摘 要】
：
According to changeability of cloud, cloud-type recognition was primarily based on single-class feature in previous papers which was restricted to a certain degree.A set of features describing the col
【机 构】
：
College of Electronic Engineering,Chengdu University of Information Technology,Chengdu 610225,China
【出 处】
：
第八届全国优秀青年气象科技工作者学术研讨会
论文部分内容阅读
According to changeability of cloud, cloud-type recognition was primarily based on single-class feature in previous papers which was restricted to a certain degree.A set of features describing the color, texture as well as the shape features were extracted, then the shape and texture features combination methods were discussed.Here Gray-level co-occurrence matrix(GLCM) and Gabor wavelet transform based texture features and Zemikc moment based shape features were combined, then support vector machine (SVM) was employed to recognize cloud-type.Experimental results showed that the correct recognition rates of altocumulus, cirrus, clear, cumulus and stratus were improved significantly, with the average recognition rate of 88.6%, and clear sky and stratuss recognition rate of 100%.
其他文献
This study analyzes the secondary eycwall formation (SEF) process in an idealized cloud-resolving simu lation of a tropical cyclone.In particular, the unbalanced boundary layer response to asymmetric
Using the experiments undertaken by 36 climate models participating in the Paleoclimate Modeling In tcrcomparison Project (PMIP), this study examines annual and seasonal surface temperatures over Chin
利用WCRP的耦合模式比较计划-阶段3的多模式数据(CMIP数据),模拟分析基于A2、A1B、B1情景下华中区域2011-2100年平均温度的可能变化,结果表明:模式模拟的结果可较好的反映出温度线性变化趋势.模拟冬季增温速率略高于夏季,但夏季增温速率与观测序列呈相反变化趋势;总体能模拟出华中区域地面气温线性趋势的空间分布特征,但模拟数值上偏高.三种情景下21世纪末华中区域平均温度的增幅(相对于19
As part of the PRIDE-PRD2006 intensive cam paign, atmospheric boundary layer (ABL) measurements were performed in Qingyuan, Panyu, and Xinken over the Pearl River Delta (PRD) on 1-30 July 2006.During
The intraseasonal oscillations (ISOs) of southern China spring rainfall (SCSR) are examined based on daily rain gauge rainfall data and NCEP/Department of Energy Reanalysis 2 (NCEP-2) products for the
本文利用常规观测资料和西南区域模式(WRF_RUC)产品,对2012年8月17-18日四川盆地西部龙门山沿线出现的暴雨过程进行了诊断分析,结果表明:对流层中低层显著高能高湿,大气层结极不稳定,为中尺度对流系统的生成和发展提供了有利的热力不稳定条件;低层风速辐合、地形强迫抬升及边界层冷空气入侵,是造成对流发展的主要因素:垂直环流圈形成的正反馈作用是暴雨临近时低层东风加大和暴雨过程中形成强烈垂直上升运
本文基于贵州多年平均旬界限内积温,计算了旬内各温度界限内的出现天数,并分别统计了喜温和喜凉作物适宜温度范围内的天数和积温,划分出了贵州作物适宜生长期.结果表明,应用旬界限内积温除以相应温度界限中值,得到的日数能够反映旬内出现在各温度界限的日数;贵州各站喜凉作物的适宜生长期包括一个或两个时段,与传统稳定通过3℃下限的仅一个时段的气候生长期结果存在差异;提出的基于旬适宜积温和适宜日数的方法能够客观划分