摘要
数据质量直接影响着GIS应用、分析、决策的正确性和可靠性,而随着真三维模型不断发展,有必要对三维空间数据的不确定性展开一系列的研究.面向对象数据模型中,空间目标抽象为点、线、面和体4种类型,其中面目标由曲面和平面表示.以较为简单的双二次Bezier曲面和较复杂的双三次Bezier曲面为例,对曲面上任意点的不确定性进行了研究,用Matlab编程实现.算例结果表明,曲面上任意点的精度至少要高于确定该曲面的点其中一点.
The rightness and credibility of application, analyzing and decision-making of GIS are directly influenced by data quality. With the development of 3D GIS model, it is necessary to make a research of error estimation of 3D spatial data serial. According to OODM, special objects are abstracted as four styles: point, line, area and body. Thereinto area object can be displayed by plane and curved surface . The case of biquadrate Bezier surface and bicubic Bezier surface are studied to estimate error of arbitrary point in curved surface in Matlab. It is shown from the examples that error preciseness of arbitrary point in curved surface is higher than that of the points in the curved surface .
出处
《桂林工学院学报》
2004年第2期183-187,共5页
Journal of Guilin University of Technology
基金
广西区科技厅资助项目(桂科攻0330008-7)
