Texture and shape analysis offer interesting possibilities to characterize the structural heterogeneity of classes in the high spatial resolution satellite imagery. In this paper, texture features are generated based ...
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Texture and shape analysis offer interesting possibilities to characterize the structural heterogeneity of classes in the high spatial resolution satellite imagery. In this paper, texture features are generated based on the Gaussian Markov random field (GMRF) model, and shape features are measured using geometric moments. Then feature selection is implemented according to the class separability. To reduce the border blurring effect introduced by texture features, the unsupervised classification algorithm involved ordered procedures is proposed, in which linear objects are extracted using spectral and shape features firstly, then other objects are detected using the combination of spectral, texture, and shape features. The proposed classification method is implemented using QuickBird imagery. For comparison, the standard K-means method with spectral data is used as a benchmark. The experimental results show that the ordered classification method with the combination of spectral, texture, and shape information performed better than conventional methods.
GPS全球定位系统(Global Positioning System)是美国国防部*** of Defense(DOD)为满足军事部门对海上、陆地和空中设施进行高精度导航和定位的要求而建立的。是结合美国海军的"Timation"计划和美国空军的"621-B"计...
详细信息
GPS全球定位系统(Global Positioning System)是美国国防部*** of Defense(DOD)为满足军事部门对海上、陆地和空中设施进行高精度导航和定位的要求而建立的。是结合美国海军的"Timation"计划和美国空军的"621-B"计划而研制,这两个计划在六十年代中期就已确定要用测距的方式来发展一种被动导航系统。该系统真正始建于1973年,经过方案论证、工程研制和生产作业等三个阶段,历经二十余年,耗资三百多亿美元于1994年全部建成。GPS作为继子午卫星系统发展起来的新一代卫星导航与定位系统,具有全球性、全天候、连续性等优点的三维导航和定位能力,以及具有良好的抗干扰性和保密性。它已成为美国导航技术现代化的最重要标志,并被视为20世纪美国继阿波罗登月计划和航天飞机计划之后的又一重大科技成就。
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