针对扫描矢量化这一数据采集手段，以提高图像质量、数据精度为目的，以教学模型为基础，利用最小二乘原理，详细讨论了扫描后的地形图几何纠正算法。

This paper discussed in detail algorithm of geometric rectification by scanned topographic map based on teaching model with least squares method to heighten image quality and data accuracy.

youdao

为了提高拼贴精度，大比例尺地形图每幅除不少于16个控制点外，更重要的是多选用方里线(或经纬线)交点作为拼贴控制用。

In order to raise the precision of collage, not less than 16 control points are required for each sheet of the large-scale topographic map, and beside...

youdao