圆曲线数字化时的模型不确定性

摘要

The current academic has carried out a number of years for researching on spatial data uncertainty as a theoretical issue in geospatial information .This paper which bases on the model error analysis on circular curve of regular curve , discusses the maximum offset distance error when circular curve digitals、model error of every point、area error when digitaling and establishes the visualization model of comprehensive error in circular curve .This paper validates the feature which takes on two -side small and mid -side bid in the digital model uncertainty .%空间数据不确定性作为地理空间信息的一个理论问题，学术界对它的研究已开展了若干年。本文通过对规则曲线中圆曲线的模型误差分析，讨论了圆曲线数字化时最大偏距误差、各个点的模型误差、数字化时导致的面积误差，建立了圆曲线综合误差带的可视化模型。验证了数字化时模型不确定性基本上呈现出两头小、中间大的“纺锤形”特征。