Plotting lineament strikes/trends on a Rose diagram

Hi everyone! Our last post was about calculating lineament strikes using GIS. Check out that post here: https://adgeos.blogspot.com/2020/03/Calculating-fault-strike-using-GIS.html

Note: When dealing with digital structural data, azimuthal bearing is the convention of choice. If you are used to quadrantal bearing, slowly re-familiarize yourself with the azimuth concept, as it is much simpler to encode.

This time, I'll be showing you how to plot the strikes you calculated in informative Rose diagrams. If you don't know what a Rose diagram is, it's a way to represent directional data by emphasizing which directions are most common in a dataset. The most frequent directions are represented by long bars emanating from the center of a circle, while less frequent directions are represented by shorter bars. You can think of it as a circular histogram.

Calculating the strikes of lineaments through GIS (ArcMap 10.4)

Hi everyone! I'll be outlining a way to automatically calculate the end-to-end strike/trend values of lineaments or faults which you have plotted in GIS software. This method uses ArcGIS, but can be adjusted and followed for QGIS. Let's get to it.

Note: When dealing with digital structural data, azimuthal bearing is the convention of choice. If you are used to quadrantal bearing, slowly re-familiarize yourself with the azimuth concept, as it is much simpler to encode.

Software used: ArcMap 10.4

0. Make sure your files use a UTM projection.

1. Open the attribute table of your lineament shapefile.

2. Add fields for the starting x and y coordinates, ending x and y coordinates. I used a Double filetype. Calculate these by right-clicking the field heading and select Calculate Geometry...