In this paper, the geometric essence of quadratictransformation in plane field is presented after studying the existing quadratic Troms formations.
本文对现有平方变换方法进行了研究，提出了平面场不同平方变换的不同几何实质。
2
This paper describes also quadratic interpolation and the method of transformation of coordinates used in the calculation.
计算中所运用的二次插值及座标变换方法，在文中作了介绍。
3
The paper teus a direct way to select nonsingular linear transformation by changing two special quadratic forms without square terms to the standard form.