物理模型结合小波变换的南极冻融探测  

Antarctic freeze-thaw detection on the basis of physical model and wavelet transform

作　　者：王星东[1,2] 李新武[2] 熊章强[1] 梁雷[2] 

机构地区：[1]中南大学有色金属成矿预测教育部重点实验室地球科学与信息物理学院,湖南长沙410083 [2]中国科学院遥感与数字地球研究所,北京100094

出　　处：《中国矿业大学学报》2013年第4期656-662,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41076129)

摘　　要：为有效进行冰盖冻融探测,在微波辐射计简单冰盖冻融物理模型和小波变换理论的基础上,提出了物理模型结合小波变换进行南极冰盖冻融探测的新算法,即运用小波变换对物理模型得到的长时间序列数据进行处理,提取剧烈变化的边缘信息,并滤除部分噪声,以其变化最大的边缘事件作为冻融发生的事件,进而得到南极冰盖的融化开始、持续和结束时间分布图.结果表明:这种算法不但解决了物理模型算法需依赖实际融化信息才能进行冰盖冻融探测的问题,而且能自动选择较多的样本,提高了冰盖冻融探测的计算效率、实用性和可操作性,还在一定程度上提高了冰盖冻融探测的精度.In order to effectively carry on the snowmelt detection,a new Antarctic freeze-thaw detection method was proposed on the basis of the simple ice-sheet freeze-thaw physical model of the microwave radiometer as well as the wavelet transform theory.That is,using the wavelet transform was to process the long-time series of data which was obtained by the physical model,and extract the edge information of the dramatic changes and filter some noises.The greatest change in the edge is considered as the freeze-thaw events to get the distribution of Antarctic melt onset date,melt duration and melt end date.The results show that： the algorithm improves the computational efficiency,usability and operability,because the algorithm does not rely on the actual melting information and can automatically select more samples.To some extent,the algorithm also improves the detective accuracy.

关 键 词：冰盖冻融探测 微波辐射计 物理模型 小波变换 

分 类 号：P237[天文地球—摄影测量与遥感]