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冰川高程数据尺度不变特征变换配准变化检测
引用本文:于堃,陆殿梅,熊黑钢.冰川高程数据尺度不变特征变换配准变化检测[J].遥感信息,2009,0(6):55-60.
作者姓名:于堃  陆殿梅  熊黑钢
作者单位:1. 南京大学海岸与海岛开发教育部重点实验室,南京210093;南佛罗里达大学海洋科学学院,圣彼德斯堡,FL,33701
2. 江苏省地质调查研究所,南京,210018
3. 北京联合大学应用文理学院城市系,北京,100083
基金项目:国家自然科学基金,国家重点基础研究发展规划(973计划) 
摘    要:针对利用多期时序DEM进行地理对象变化监测过程中数据配准的精度与效率不足的问题,提出了一种基于SIFT匹配的多期DEM配准与冰川变化检测方法。首先,将DEM转换到影像空间,通过SIFT特征匹配计算多期DEM影像同名点,实现快速精确的DEM数据配准。其次,以配准DEM进行变化差异分析,计算冰川变化面积和速率参数。最后,以2004年至2014年间获取的西藏自治区浪卡子县附近分布的冰川多期DEM进行变化检测实验,证明该方法能够较好检测冰川变化,总体精度优于85%。

关 键 词:二类水体  离水辐射率  叶绿素浓度  大气校正
收稿时间:2008-12-19
修稿时间:2009-02-09

Analysis and Retrieving of Surface Layer Chlorophyll Concentration of Bohai Sea in Past 7 Years
YU Kun,LU Dian-mei,XIONG Hei-gang.Analysis and Retrieving of Surface Layer Chlorophyll Concentration of Bohai Sea in Past 7 Years[J].Remote Sensing Information,2009,0(6):55-60.
Authors:YU Kun  LU Dian-mei  XIONG Hei-gang
Institution:YU Kun,LU Dian-mei,XIONG Hei-gang (① Key Laboratory of Coast and Island Development of MOE,Nanjing University,Nanjing 210093;② College of Marine Science,University of South Florida,140 Seventh Avenue South,St.Petersburg,FL 33701,USA;③ Jiangsu Province Institute of Geology,Nanjing 210018;④ Urban Department,College of Arts and Sciences of Beijing Union University,Beijing 100083)
Abstract:Chlorophyll contained in seawater is not only material foundation to maintain the survival of marine organism,but also an important parameter to calculate oceanic primary production.Meanwhile it affects the carbon cycle between the system of ocean and atmosphere,furthermore,it reflects the influence of human activity and change of entironmenL However,traditional methods are unable to solve large-scale monitoring at the same time,so remote sensing as an effective tool is used to real-time monitoring chlorophyll broadly,because satellite images have many characters such as:short-period monitoring,high time-space resolution,large-scale monitoring at the same time,images can be compared with each other and specialized sensor,these characters decide remote sensing images are a quite important data source to monitoring ocean.So we use MODIS data which were corrected by our atmospheric algorithm,then we retrieve chlorophyll concentration of Bohai Sea for each middle December days from 2000 to 2006,and we choose 4 field observed teaults collected on the middle December day of 2005 to validate the retrieved results simultaneously.Comparing the retrieved results with measured results,we find that relative errors are Iowet than 10% except No.3 point,thus it proves that our results are exact. After retrieving,we classify chlorophyll concentration into 0-1mg/m~3,1-2mg/m~3,2-3mg/m~3,and over 3mg/m~3 then get the transfer matrix of area for each classifications by statistics.Accordins to statistic results,we draw these conclusions:(1)Chlorophyll concentration of research area decreases in the periods of 2000-2001,2002-2003,2003-2004 and 2004-2005,and the amplitude of first two periods are higher than the last two.However,chlorophyll concentration of research area increases in the periods of 2001-2002 and 2005-2006,and the amplitude of the two periods are both high.(2)Area of lower chlorophyll concentration(0-2mg/m~3)tend to decline during 2000 to 2006,but area of higher chlorophyll concentration(over 2mg/m~3)tend to increase.Although the declined periods are more than the inereased periods,the amplitude of decrease is lower than increase.As a resuh,chlorophyll concentration of research area tends to increase during 2000 to 2006.
Keywords:water-leaving radiance  chlorophyll concentration  atmospheric correction
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