摘要
研究多层矢量GIS地图叠置分析中点元的方差估计问题。针对现有的研究成果均局限于各叠置层同名点元的权已知、而实际上难以确切知道的问题,提出了在各叠置层同名点元的权未知的情况下的点元方差估计方法,导出了各图层(同名)点元方差的估计公式、所得方差估计值的方差估计公式以及叠置后点元的方差估计公式。并用一个算例考察了该估计方法的可行性。
Map overlay is one of the basic functions in GIS,and its error is an important issue that should be focused on.In the vectorgraph overlaying analysis,there are often some homonymic points in each map.So using these points with the same name,variances can be estimated.A variance estimation method,under the condition when weights are unkonwn,is discussed here.And then the formula to calculate the variances are proposed.Finally an example is illustrated in this paper,and the result indicates that this estimation method is feasible.
出处
《测绘工程》
CSCD
2002年第4期18-21,共4页
Engineering of Surveying and Mapping
基金
国家自然科学基金资助项目(49874002)
国家测绘局测绘基金资助项目(99010)。
