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1、第39卷第6期测绘学报Vol.39,No.62010年12月ActaGeodaeticaetCartographicaSinicaDec.,2010文章编号:10011595(2010)06064207几何条件与变换模型对坐标变换质量的影响1,4234钟成,李卉,李宗华,李德仁1.中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北武汉430074;2.中国地质大学(武汉)空间科学技术研究中心,湖北武汉430074;3.武汉市国土资源和规划信息中心,湖北武汉430014;4.武汉大学测
2、绘遥感信息工程国家重点试验室,湖北武汉430079AffectsofGeometricalConditionsandTransformationMethodsonQualityofCoordinateTransformation1,4234ZHONGCheng,LIHui,LIZonghua,LIDeren1.ThreeGorgesResearchCenterforGeohazard,MinistryofEducation,ChinaUniversityofGeosciences,Wuhan430074,Chin
3、a;2.SpatialScienceandTechnologyInstitution,ChinaUniversityofGeosciences,Wuhan430074,China;3.WuhanUrbanPlanningInformationCenter,Wuhan430014,China;4.StateKeyLaboratoryofInformationEngineeringinSurveying,MappingandRemoteSensing,WuhanUniversity,Wuhan430079,ChinaAb
4、stract:Itispresentedthatthecrucialfactorforthequalityofcoordinatetransformationisthesignaltonoiseratio(SNR)ofcommonpoints,sodifferencesamongtransformationmodelsaretheirsimulationabilityofsignals,detectabilityanddefensibilityofnoises.Then,anewqualityevaluation
5、systemofcoordinatetransformation,includingreliabilityindicatorsandsimulationindicators,isputforward.Thereliabilityindicatorsincludetheredundantobservationcomponents,innerandexternalreliability,whichimplythegeometrycondition,detectabilityanddefensibilityofnoise
6、srespectively;thesimulationindicatorsincludeprecision,expansibility,invertibilityanduniqueness,whichimplythesimulationabilityforvariousrequirements.Experimenthasverifiedthefeasibility,necessityandvalidityoftheindicators,andinvestigatedaffectsofgeometricalcondit
7、ionsandtransformationmethodsontheindicators.Atlast,itispointedoutthatsomemethodstoimprovegeometricalconditions,andtheapplicableconditionfortransformationmethodswiththeirperformancesontheindicatorsabove.Keywords:coordinatetransformation;SNR;geometrycondition;tra
8、nsformationmethods;reliability;qualityevaluation摘要:提出同名点的信噪比是影响坐标变换质量的根本因素,各种变换方法的区别在于对信号的模拟能力和抗噪音干扰能力。设计一套包含可靠性指标和模拟水平指标的坐标变换评价体系。通过计算各个同名点的多余观测分量和内、外可靠性,评价在某种坐标变换方法下各同名点发
