This QGIS plugin can be used to extract lineament & fracture size, abundance and topological parameters from two-dimensional GIS polylines along with their topological branches and nodes. The results will be given as graphical plots.
The plugin is experimental and a work-in-progress and installation requires the manual installation of a few external python libraries. Installation at this stage is not recommended though it is possible.
This plugin uses four types of vector data as inputs: traces (Polylines), branches (Polylines), nodes (Points) and areas (Polygons).
Traces can be manually or automatically digitized GIS polyline features from e.g. Light Detection And Ranging (LiDAR) digital elevation models (DEMs) or from drone orthophotography of bedrock outcrop surfaces. Branches and nodes are derived from NetworkGT. Areas are the interpretation boundaries of the traces and branches.
Example plots from the plugin.
This plugin has been built to only work with data extracted using another QGIS-plugin, NetworkGT (Homepage) (Also see: Nyberg et al., 2018):
The NetworkGT (Network Geometry and Topology) Toolbox is a set of tools designed for the geometric and topological analysis of fracture networks.
If the input data (traces) you have can be processed in NetworkGT into branches and nodes it is suitable for this plugin. NetworkGT is available for both QGIS and ArcGIS and branch and node data from both should be valid inputs into this plugin (as of 15.2.2020).
Online Help Documentation
- Online help is hosted on GitHub Pages: Help Documentation
If you want a local copy of the Help Documentation: Download Here (Click download inside after following the link)
Download the .zip-file and unzip the file to a folder of your choosing. Then open index.html in the folder. It should open the Help Documentation in your native browser.
Plugin Download Here as a .zip file (Click download inside)
See the Help Documentation and follow the instructions there.
Sample data from an island in SE-Finland is included. Contains an orthomosaic of an island outcrop (.tif), manually digitized traces (Shapefile), branches (Shapefile) and nodes (Shapefile) extracted from NetworkGT and the interpretation boundary polygon (Shapefile).