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面向对象遥感分类方法在汶川地震震害提取中的应用 总被引:7,自引:0,他引:7
震后城市建筑物震害的自动识别与分类, 是遥感震害调查中的关键步骤, 其精度直接影响损失评估的结果. 而随着高分辨率遥感影像的发展, 传统基于像元的分类技术已不能满足需求, 引入面向对象的信息提取技术, 充分挖掘影像对象的纹理、形状和相互关系等信息, 能够有效的提高震害的分类精度. 该文阐述了面向对象的遥感震害提取思路和方法, 并应用汶川地震震后高分辨率航空遥感数据, 针对建筑物震害进行面向对象的快速提取与自动分类. 结果表明, 与基于像元分类比较, 面向对象的建筑物震害分类能够显著改善分类效果. 相似文献
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建筑物倒塌是造成地震人员伤亡的主要原因,对地震应急救援与决策具有重要的指导意义.遥感以其综合、宏观、快速、动态的特点,为地震灾害信息调查和震害快速评估提供了一种可靠的信息源.面向对象的分类方法是针对高分辨率影像的一种新的分类方法.本文在总结遥感影像建筑物震害信息提取方法进展的基础上,将建筑物分为基本完好和毁坏两个等级.选取唐山地震和汶川地震的震后航片,利用面向对象的分类方法来识别影像上基本完好的建筑物,计算评估区内的建筑物倒塌率.实验结果表明,面向对象的分类方法充分利用了图像上的光谱、形状、纹理等特征.在很大程度上克服了基于像元分类方法的局限性,并且基于对象的建筑物倒塌率计算也取得了较好的精度. 相似文献
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遥感影像土地覆盖分类面临"类别密度差异显著"、"同谱异物"和"同物异谱"等不确定性问题,传统的分类方法(如FCM)因不能描述高阶模糊不确定性,无法完成准确建模,使分类误差较大,而二型模糊集恰是处理此类不确定性的有效工具.在引入二型模糊集新概念和自适应降型新方法的基础上,提出一种自适应二型模糊分类方法(A-IT2FCM):(1)基于样本集模糊距离度量构建面向分类的区间二型模糊集,以尽可能降低对先验知识和预设参数的依赖,从而满足自动分类的要求;(2)给出一种自适应探求等价一型代表(模糊)集合的高效降型方法,在此基础上进行自适应区间二型模糊聚类.实验数据为珠海横琴和北京颐和园的SPOT5影像数据,对比方法有A-IT2FCM、基于Karnik-Mendel算法降型和基于Tizhoosh提出的简易降型方法的区间二型模糊C均值聚类以及作者前期研究提出的区间值模糊C-均值算法(IV-FCM).实验结果表明,A-IT2FCM方法分类效果佳,在类别具有较大密度差异和多重模糊性时能得到比FCM及IV-FCM更精确的边界和更连贯的类别,适于处理遥感影像土地覆盖类别的深层不确定性;同时在"光谱混叠"现象严重时,可以获得比对比方法更稳健、精度更高的影像自动分类结果,且时间复杂度明显低于基于Karnik-Mendel方法. 相似文献
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滑坡是最为常见的地震次生灾害之一,对其进行有效监测一直都是业界研究的热点。基于此,提出了一种高分遥感影像地震滑坡信息快速检测方法,该方法将SHALSTAB模型与面向对象影像分析相结合,首先对遥感影像进行多尺度分割,并根据稳定性模型赋权,然后根据深度学习机制对滑坡对象进行检测,最后对检测结果进行过滤,并将该方法应用于2013年芦山地震滑坡检测,与目视解译结果进行对比。结果表明:该方法能快速检测高分遥感影像上滑坡,滑坡检测正确率达85%以上。 相似文献
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近年来,随着遥感影像分辨率的提高和遥感信息提取技术的发展,遥感技术逐渐成为快速获取地震灾情信息、震后应急和震害快速评估的有效手段。但以往的遥感震害信息提取结果精度较低、震害识别对象单一 相似文献
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为了提高建筑物震害信息提取的效率与准确度,针对震后高分辨率遥感影像,根据震害建筑物在遥感影像上的特征,以2010年海地MS7.0地震为例,通过尺度参数估计算法自动选择最优分割尺度对影像进行多尺度分割,并采用面向对象方法对海地高分辨率遥感影像进行建筑物震害信息提取,同时与基于像元的支持向量机、反向传播神经网络、基于分类回归算法的决策树分类方法进行比较。试验结果表明,面向对象的分类方法具有更好的目视效果和更高的分类精度,有利于地震后震害信息的准确提取和快速评估。 相似文献
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《地震研究进展(英文)》2021,1(4):100069
In order to improve the accuracy of building structure identification using remote sensing images, a building structure classification method based on multi-feature fusion of UAV remote sensing image is proposed in this paper. Three identification approaches of remote sensing images are integrated in this method: object-oriented, texture feature, and digital elevation based on DSM and DEM. So RGB threshold classification method is used to classify the identification results. The accuracy of building structure classification based on each feature and the multi-feature fusion are compared and analyzed. The results show that the building structure classification method is feasible and can accurately identify the structures in large-area remote sensing images. 相似文献
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Zhao Xiang Liang ShunLin Liu SuHong Wang JinDi Qin Jun Li Qing Li XiaoWen 《中国科学D辑(英文版)》2008,51(3):349-356
The existing methods in atmospheric correction of hyperspectral data usually focus on removing the effects of water vapor and other absorptive gases, while this paper mainly studies the method of re- moving the influence of the aerosol and the water vapor simultaneously. Because the hyperspectral data has a larger number of bands, the conventional dark object method cannot be applied to the at- mospheric correction of the hyperspectral data which can be improved, as described in this paper, by adequately making use of spectral characteristics of the hyperspectral data with an iterative correction during the whole process. The effects of the aerosol and water vapor are eliminated at the same time finally. The improved dark object method is used to do the atomospheric correction of the Hyperion data in Yanzhou, Shandong Province as an example. And the result indicates that it can correct the atmospheric influence of the hyperspectral data quickly and remarkably. 相似文献
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Mapping groundwater‐dependent ecosystems using remote sensing measures of vegetation and moisture dynamics 下载免费PDF全文
Olga V. Barron Irina Emelyanova Thomas G. Van Niel Daniel Pollock Geoff Hodgson 《水文研究》2014,28(2):372-385
Protection of groundwater‐dependent ecosystems (GDEs) is an important criterion in sustainable groundwater management, particularly when human water consumption is in competition with environmental water demands; however, the delineation of GDEs is commonly a challenging task. The Groundwater‐dependent Ecosystem Mapping (GEM) method proposed here is based on interpretation of the land surface response to the drying process derived from combined changes in two multispectral indices, the Normalised Difference Vegetation Index and the Normalised Difference Wetness Index, both derived from Landsat imagery. The GEM method predicts three land cover classes used for delineation of potential GDEs: vegetation with permanent access to groundwater; vegetation with diminishing access to groundwater; and water bodies that can persist through a prolonged dry period. The method was applied to a study site in the Ellen Brook region of Western Australia, where a number of GDEs associated with localised groundwater, diffuse discharge zones, and riparian vegetation were known. The estimated accuracy of the method indicated a good agreement between the predicted and known GDEs; Producer's accuracy was calculated as up to 91% for some areas. The method is most applicable for mapping GDEs in regions with a distinct drying period. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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Land cover classification of remote sensing imagery based on interval-valued data fuzzy c-means algorithm 总被引:1,自引:0,他引:1
There is a certain degree of ambiguity associated with remote sensing as a means of performing earth observations.Using interval-valued data to describe clustering prototype features may be more suitable for handling the fuzzy nature of remote sensing data,which is caused by the uncertainty and heterogeneity in the surface spectral reflectance of ground objects.After constructing a multi-spectral interval-valued model of source data and defining a distance measure to achieve the maximum dissimilarity between intervals,an interval-valued fuzzy c-means(FCM)clustering algorithm that considers both the functional characteristics of fuzzy clustering algorithms and the interregional features of ground object spectral reflectance was applied in this study.Such a process can significantly improve the clustering effect;specifically,the process can reduce the synonym spectrum phenomenon and the misclassification caused by the overlap of spectral features between classes of clustering results.Clustering analysis experiments aimed at land cover classification using remote sensing imagery from the SPOT-5 satellite sensor for the Pearl River Delta region,China,and the TM sensor for Yushu,Qinghai,China,were conducted,as well as experiments involving the conventional FCM algorithm,the results of which were used for comparative analysis.Next,a supervised classification method was used to validate the clustering results.The final results indicate that the proposed interval-valued FCM clustering is more effective than the conventional FCM clustering method for land cover classification using multi-spectral remote sensing imagery. 相似文献
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本文提出一种新的分层混合模糊-神经网络(HHFNN)算法.在模糊系统中使用Takagi-Sugeno模型和三角波隶属函数.同时,为降低离散输入变量中可能存在的强交互作用,采用了系数收缩机制中的Lasso函数.最后,以福建的漳平洛阳—安溪潘田地区LANDSAT ETM+遥感影像数据地物分类为例,应用本文的改进算法与其他神经网络算法进行分析比较,得到了较高的分类精度,验证了采用基于Lasso函数的T-S型分层混合模糊-神经网络的可行性和有效性,可作为一种新的遥感影像地物分类方法. 相似文献
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基于聚类分析方法的砾岩油藏储层类型划分 总被引:1,自引:0,他引:1
砾岩油藏由于近物源、多水系和快速多变的沉积环境导致储层岩性复杂多变以及非均质性严重等特点,储层类型的精细划分成为该类油藏二次调整开发的重点和难点.本文以克拉玛依油田六中区克下组砾岩油藏为研究对象,选取密闭取心井岩心分析的物性参数、压汞驱替参数以及微观孔隙结构参数共计12项作为砾岩油藏储层类型划分的参数组合,对比研究了基于划分、基于层次、基于模型和基于密度的4种聚类算法建立的储层划分标准,结果表明基于划分的k-means算法建立的聚类标准最符合实际油藏的地质特征和储层类型的划分精度,内部度量的紧凑性、有效性和分辨性都优于其他三种算法,并且分析了Ⅴ类储层与岩性的对应关系,发现砾岩油藏储层类型受岩性控制的机制非常复杂,岩性相同的储层类型可能呈现出不同的物性和渗流性,而岩性不同的储层类型又可能表现为相同的物性和渗流性,其根本原因是储层非均质性造成的.储层类型与砾岩岩性的有效结合为该区精细开发方案的设计和水淹层的定量评价提供了技术支持. 相似文献