Overview
GeoRefMaps is an MVP tool for the semi-automatic georeferencing of geological maps distributed as PDF documents and raster images.
It was designed to detect map-border coordinates, identify the main cartographic frame, and generate geographic control points (GCPs) with visual assistance and manual correction support.
Current Capabilities
The project already integrates:
- A functional Python graphical interface
- Vector PDF reading
- Raster image processing
- OCR fallback with Tesseract
- Automatic corner detection
- Recognition of projected UTM coordinates
- Experimental support for geographic coordinates
The current workflow is focused on geological cartography from Peru.
Workflow
GeoRefMaps currently supports maps in PDF, PNG, JPG, and TIFF formats.
The workflow can:
- Extract vector text directly from PDFs
- Apply OCR on borders and selected areas of interest
- Estimate the main cartographic frame and grid lines
- Assign coordinates to the four map corners
- Allow manual validation and correction from the interface
Outputs
The application can export:
- The full map sheet as a georeferenced GeoTIFF
Export and reprojection are already supported for:
- EPSG:4326
- EPSG:32717
- EPSG:32718
- EPSG:32719
Repository
Release
Applied Value
At its current stage, GeoRefMaps demonstrates a solid technical foundation for reducing manual georeferencing time and supporting geological, mining, and cartographic workflows.