基于ArcGIS的Fry法自动实现

Automatic Implementation of Fry Method Based on ArcGIS

摘要:

Fry法是一种基于应变标志体相对位置的有限应变测量方法，在构造地质研究领域广泛应用。传统的纸上作业方式过程繁琐，耗时漫长；已有的计算程序因编程语言不再使用、可视化程度低或主观性较强也已较少使用。本文基于ArcGIS平台，使用Python语言编制了新的Fry法应变测量程序。在点要素类上人工标记应变标志体的中心点后，运行程序即可快速获得Fry图解；交互输入空心椭圆半长轴、半短轴和旋转角的可能范围、步长后，利用点密度法可计算获得最佳拟合椭圆，并输出对应数据。本文通过2个实例，证明该程序操作简便，结果客观。

Abstract:

The Fry method is a finite strain measurement method based on the relative position of strain markers. It is widely used in the field of structural geology research. The traditional paper-based operation method is cumbersome and time-consuming. Existing computing programs are less commonly used due to the discontinuation of programming languages, low level of visualization, or strong subjectivity. Based on the ArcGIS platform, by using Python language, a new fry method strain measurement program has been developed. After manually marking the center point of the strain indicator on the point feature class, the fry diagram can be quickly obtained by running the program. After interactively inputting the possible range and step size of the semi major axis, semi minor axis, and rotation angle of the hollow ellipse, the point density method can be used to calculate the best fitting ellipse and output the corresponding data. In this paper, through two examples, it is proved that the program is easy to operate and the results are objective.