Modeling Positional Errors of Geographical Lines in Vector GIS
矢量GIS图上地理曲线的定位误差模型

To analyze positional accuracy of geographical line s in GIS, this paper begins with a discussion on the representation and positional errors of linear features. We make a clear distinction between digital lines in spatial databases and continuous lines in the natural world. Using algorithms f or generating continuous curves from digital lines in GIS, we develop several er ror band models for continuous curves and derive numerical relationships for est imating errors of line length. Examples are provided to show the visualization o f error bands of geographical curves and the use of error equations of line leng th.