A QGIS plugin (with an ArcGIS Pro version) that simplifies geological maps while keeping their structure: it subsamples structural orientation data, joins and ranks faults, cleans and merges geological polygons, and scales a whole map to a smaller scale with the Töpfer & Pillewizer rule. Every result records how it was made, in a metadata file beside it.
- User Manual: installing, a quick start, and every tool with worked examples and screenshots on a Western Australian 1:100 000 map.
- Reference Manual: how every result is calculated (algorithms, formulas, constants, output fields, units, known issues and caveats).
- Changelog: what changed in each version.
- ArcGIS Pro version: the toolbox and its Python environment.
| Tab | Tools |
|---|---|
| Clean | Fix Map (topological clean-up of polygons and faults, with a report), Repair (buffer 0), Densify Nodes (shared nodes at a fixed spacing), Thin Nodes (fewer nodes: removes nodes closer than a minimum spacing, keeping shared boundaries and faults consistent) |
| Points | Orientation subsampling: Stochastic, Kent grid averaging (optional kappa filter), Kent Outlier, Carmichael, 1o Sampling, with Auto-fit to N points |
| Faults | Merge Segments; fault attributes: Length, Graph (network edge types), Strat Offset, Orientation Clusters |
| Polygons | Rescale Map (merge small polygons by stratigraphic priority), Simplify Map (topology-preserving Visvalingam-Whyatt), Töpfer & Pillewizer scaling of points, faults and polygons together |
- Install the QPIP plugin through the QGIS Plugin Manager.
- Put this folder in your QGIS plugins directory and restart QGIS. QPIP offers to install the missing
packages listed in
requirements.txt. - Enable GeoSubSampler in the Plugin Manager; it opens as a dock widget.
Dependencies: shapely 2.0+, NumPy, pandas, GeoPandas, Fiona, SciPy, Matplotlib, scikit-learn, NetworkX and triangle (only for triangulating ignore-code polygons). For ArcGIS Pro see ARCGIS/README.md.
MIT License.
Ranee Joshi - most calculation code - raneejoshi@gmail.com
Mark Jessell - some calculation code and GUI - mark.jessell@uwa.edu.au
- Current version: 0.5.1 (begun 2025-07-28, generated with Plugin Builder)
- Changes in each version, including unreleased ones: CHANGELOG.md