SecInterp (Section Interpreter) is a professional QGIS plugin designed for industrial-grade extraction and visualization of geological data. It empowers geologists to generate high-fidelity topographic profiles, project outcrops with structural integrity, and perform complex 3D drillhole analysis within a unified 2D cross-section environment.
SecInterp v3.0.1: Now with 11-language support and zero signal leaks.
Phase: Extreme Stability & Global Reach
- Zero Signal Leaks: Eliminated all 22 leaks detected by
qgis-analyzer, ensuring long-term UI stability. - Improved Maintainability: Refactored
SignalManagerand applied project-wideBlack/Ruffformatting.
- 11-Language Support: Added official support for Hindi (HI) and Japanese (JA).
- Optimized Distribution: Reduced plugin size by ~80% through aggressive exclusion patterns.
See CHANGELOG.md for complete details.
- Real-time Visualization: Instantly view topography, geology, and structures along any drawn section line.
- Performance: Uses Parallel Processing to handle complex geological intersections without freezing QGIS.
- Adaptive Level of Detail (LOD): Automatically adjusts data density based on zoom level for smooth navigation.
- Measurement Tools: Measure distances and calculate slopes/gradients directly on the profile view with automatic Snapping to vertices.
- Drillhole Support: Project 3D drillhole traces and geological intervals (sondajes) onto the 2D cross-section plane.
Fig 1. Main interface showing topography and projected geology.
- Topography: Extracts elevation profiles from any DEM raster.
- Geology: Projects polygon outcrops onto the section line, respecting valid lithological boundaries.
- Structure: Projects dip/strike measurements with configurable buffer zones and apparent dip calculations.
- Interactive Drawing: Draw interpretation polygons directly on the profile view.
- Smart Snapping: Accurately snap vertices to existing topographic or geological features.
- Auto-Color: Automatically assigns vivid colors to distinguish new interpretations.
- Undo/Redo: Flexible editing with right-click undo support during drawing.
- Formats: Export directly to SHP, CSV, DXF, PDF, SVG, or PNG.
- Layout: Results are ready for CAD integration or reporting.
Before installing SecInterp, ensure your system meets the following requirements:
- QGIS: 3.28 LTR or superior.
- Python: 3.10 or superior (included with QGIS).
- Dependencies: The plugin uses standard QGIS and PyQt5 libraries. Advanced analysis and development tools (like the QGIS Plugin Analyzer tool, executed via the
qgis-analyzercommand, andai-context-core) are only required for developers and auditors.
- Open QGIS.
- Go to Plugins > Manage and Install Plugins.
- Search for
SecInterp. - Click Install Plugin.
- Download the latest
sec_interp_v2.7.0.zipfrom releases. - Open QGIS.
- Go to Plugins > Manage and Install Plugins > Install from ZIP.
- Select the file and click Install.
For detailed instructions, please see the User Guide.
-
Prepare Data: Load your DEM (Raster), Geology (Polygons), and Structure (Points) layers in QGIS.
-
Launch Plugin: Click the SecInterp icon in the toolbar.
-
Configure Layers:
-
DEM: Select your elevation raster and band.
-
Cross-section: Select the line layer that defines your profile.
-
Geology: Select the outcrop layer and the lithology attribute field.
-
Structure: Select the point layer and dip/strike fields.
-
Drillholes (Optional): Configure Collars, Survey, and Intervals in the Drillholes page to project 2D drillhole traces.
-
-
Preview: Click Preview Profile. The view will update asynchronously.
- Tip: Use the scroll wheel to zoom in/out. The detail level will adapt automatically.
- Tip: Colapse panels to the left, and Results colapse down to save space.
-
Export: Use the Export button in the preview toolbar or go to the Settings page for batch export configuration.
This plugin is open-source and welcomes contributions.
- Source Code: GitHub Repository
- Documentation:
- User Guide: How to use the plugin.
- Architecture: Technical design and patterns.
- Development Guide: Code standards and setup.
- Maintenance Log: Changelog and release procedures.
- Technical Compendium: Geophysical research and details.
- Development Setup: Use the
Makefileand the Development Guide. - Testing with Docker (Recommended):
Esta suite ejecuta los tests del proyecto dentro de un contenedor QGIS oficial (
qgis/qgis:latest), garantizando un entorno reproducible y libre de conflictos de dependencias locales.make docker-build # Build the test image make docker-test # Run the full test suite inside a container
This project is licensed under the GNU General Public License v3.0. See LICENSE for details.