用传统方法(即用手工)绘制节理等密图不但费时,费力,而且往往难免出现差错。本文提出了一种用电子计算机绘制节理等密图的方法,并给出了用BD—200语言书写的源程序。这一方法和程序,原则上亦适用于岩组分析中绘制等密图,其优点是迅速,准确,可以处理大量数据。 It is not only time-consuming and labor-intensive to draw joint isograms using the traditional method (ie, by hand), but errors are often inevitable. In this paper, we present a method of drawing an isthmogram using a computer and give a source program written in the BD-200 language. This method and procedure, in principle, also applies to the mapping of isopy maps in rock group analysis, which has the advantage of being rapid, accurate and capable of handling large volumes of data.