Positional uncertainty of manual digitization vertex based on simulation test
The theoretical models of positional uncertainty of vertexes have been derived from overlay of the error ellipse models that are considered as the positional uncertainty models of line endpoints.Using probability theory and simulation tests,we mainly study the positional uncertainty characteristics of manual digitization vertex.The research results are as follows:first,using the method,that is sequentially digitizing a series of vertexes with different turning angles,repeating about six hundred times,we can get the stable distribution of frequency of digitizing points;second,in the direction of the angular bisector of turning angle,with the value of turning angle increased,the digitizing points from digitizing vertexes have a trend for gather,and the frequency distribution whose peak is less than three shows skewness,while in the direction of the perpendicular angular bisector of turning angle,digitizing points of vertexes with the acute turning angles are more concentrated than the ones with obtuse angles,and the distribution performs a state of symmetric but not the standard normal distribution;third,two dimensional uncertainty model of digitizing vertexes whose plane projection is a type of irregular geometric shape is a joint distribution model combined by skew distribution and approximate normal distribution.
Vertex Manual Digitization Turning Angle Positional Uncertainty Distribution Law
Huisheng Wu Zhaoli Liu Lifang Lin
Northeast Institute of Geography and Agricultural Ecology Research,CAS,Changchun,China 130012 ;Gradu Northeast Institute of Geography and Agricultural Ecology Research,CAS,Changchun,China 130012 Dalian Maritime University,Dalian,China 116026
国际会议
第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)
广州
英文
2008-06-28（万方平台首次上网日期，不代表论文的发表时间）