Contour fitting with moving surface considering sample dispersion
Contour fitting based on moving surface is a common algorithm in map digitalization.But due to the limitation of the elevation fitting models,the elevation of grid points in the DEM may comprise systematic errors,and it is unavoidable to cause the local distortion of the generated contour.In this paper,sample dispersion factor was introduced to the elevation fitting model for the grid point in the DEM,which was related to both the number of the sampled points in the selected area around the fitting point and the distances between the sampled points.The influence of sample dispersion factor was analyzed comprehensively,and the rule for optimally selecting points was discussed.Furthermore,the steps to fit contours considering the sample dispersion factor were suggested.With simulated data collected from a standardized digital map,the precision of the generated contour considering sample dispersion factor was analyzed in detail and some beneficial conclusions were made.
digital map contour moving surface elevation fitting model DEM systematic error local distortion sample dispersion factor sampled point precision
Mingfeng Li Chunhui Chen Bo Yuan Zhenyu Zhu Huan Zhou
College of Civil Engineering,Najinging University of Technology,200＃ North Zhongshan Road,Nanjing,Jiangsu,China 210009
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）