Discrete nodes are linked to make a triangulation.Isobaric points are traced in this triangulation .Isobar can be drawn by linking isobaric points with smooth curve.

• 把离散的节点连接成不规则的三角形网格，在三角形网格上追踪等压点，最后将等压点用光滑曲线连接，即可给出等压线。