GIS中矢量数据缓冲区操作的不确定性传播模型

THE UNCERTAINTY PROPAGATION MODEL OF VECTOR DATA ON “BUFFER” OPERATION IN GIS

研究了矢量数据缓冲区操作点、线、面状地物的不确定性传播模型。研究结果表明：对点状地物做缓冲区操作，操作结果的绝对精度与缓冲区的宽度和点位中误差成反比，相对精度与点位中误差和缓冲区宽度的比值成反比；对线状或面状地物做缓冲区操作时，操作结果的绝对精度与缓冲区的宽度和“ε－带”或点位中误差成反比，相对精度与缓冲区的宽度成正比，与地物的“ε－带”或点位中误差成反比。

The uncertainty propagation models of vector data which include point features、line features and polygon features on “buffer” operation are discussed. The results indicate the when a point feature is buffered, the absolute accuracy of operation is in verse proportion to the width of buffer and standard error of the point feature, the relative accuracy is in verse proportion to the ratio between standard error and the width of buffer, and when a line feature of a polygon feature is buffered, the absolute accuracy of operation is in verse proportion to the width of buffer and “εband” or standard point position error of the line feature or the polygon feature; the relative accuracy is in direct proportion to the width of buffer, in verse proportion to “εband” or standard point position error of the line feature or the polygon feature.