First, a horizontally two-dimensional dynamical diagnosis model is set up in Cartesian coordinates, which is used to calculate surface wind field based on grid pressure data from weather maps by a computer scanning technique.

• 首先建立一个简单的水平二维地面风场诊断模式 ,根据由微机支持的数字化仪输入的地面格点气压场 ,诊断出地面风场 ;