数字化地质中的误差校正

ERROR CORRECTION OF DIGITAL GEOLOGY

分析数字化过程中图形数据输入时引起误差的原因,说明了误差校正的原理,通过几何变换、最小二乘法线性校正、分块校正等方法对图形数据进行校正,经过仿射变换、双线性变换、平方变换、双平方变换、立方变换、四阶多项式变换等对图像进行校准。实践表明MAPGIS提供的误差较正功能模块进行图形校正,在地质图件的应用中效果很好。

There are three types of pattern data errors in the digitalization process , which are source error, processing error and application error. According to the different factors of data skew, the output maps can meets the accuracy specification by using geometric transformation, method of least squares and portioning correction.