测量专业中很重要的基础知识，测量平差中误差椭圆的计算及画图程序-Measuring a very important foundation of professional knowledge, measurement error ellipse Adjustment calculation program

改程序用于绘制误差椭圆，是测绘、土建行业中分析问题、精度叫常用的工具。-Change the program used to draw error ellipse is a mapping, civil engineering industry, analysis of issues, often called the precision tools.