地信专业英语.ppt

*TheISODATAutilityrepeatstheclusteringoftheimageuntileither:amaximumnumberofiterationshasbeenperformed,oramaximumpercentageofunchangedpixelshasbeenreachedbetweentwoiterations.※※Classification—Unsupervised*ISODATAArbitraryClustersISODATAFirstPassISODATASecondPass专业词汇1、网络分析2、邻近度分析3、三维表面分析4、直方图匹配5、光谱增强6、空间信息7、土地信息系统8．拓扑结构9．关联属性数据10．能见度分析11．派生数据12．人工数字化13．硬拷贝地图14．线跟踪15．目测16．比例尺修正*17．拉伸变形18．交互核对19．全站经纬仪20．边界匹配21．交互图形编辑22．地图综合23．线要素化简24．数据优先级25．图幅26．空间建模27．GIS分析模型28．数据重分类29．边界融合30．插值分析31．不规则三角网32．图像解译*Afteraclassificationisperformed,thesemethodsareavailablefortestingtheaccuracyoftheclassification:Thresholding(定义阈值/’θre?h?uld/)—Useaprobabilityimagefiletoscreen(筛选)outmisclassified(错分的)—pixels.AccuracyAssessment—Comparetheclassificationtogroundtruthorotherdata.※※Classification—Evaluating*ThresholdingThresholdingistheprocessofidentifyingthepixelsinaclassifiedimagethatarethemostlikelytobeclassifiedincorrectly.Thesepixelsareputintoanotherclass(usuallyclass0).Thesepixelsareidentifiedstatistically,baseduponthedistancemeasuresthatwereusedintheclassificationdecisionrule.※※Classification—Evaluating*ThresholdingInaminimumdistanceclassification,eachdistancevalueistheEuclidean(欧氏)spectraldistancebetweenthemeasurementvectorofthepixelandthemeanvectorofthepixel’sclass.InaMahalanobisdistanceormaximumlikelihoodclassification,thedistancevalueistheMahalanobisdistancebetweenthemeasurementvectorofthepixelandthemeanvectorofthepixel’sclass.※※Classification—Evaluating*卡方/kaiskwe?/*Itshowshowthehistogram(/’hist?gr?m/)ofthedistanceimageusuallyappears.Thisdistributioniscalledachi-squaredistribution,asopposedtoanormaldistribution(正态分布),whichisasymmetrical(对称的/si’metrikl/)bellcurve.HistogramofaDistanceImageThepixelsth