This data.frame contains control points for defining a 2D cartesian coordinate transformation. The control points are in both the source and target coordinates.
此数据框包含控制点定义一个二维直角坐标变换。控制点是在源和目标坐标。
用法----------Usage----------
data(control.points)
格式----------Format----------
A data.frame consisting on 16 control points with ID, coordinates X and
16个控制点组成的数据框的ID,坐标X和