GField Mapper is a tablet application for geological fieldwork: observation points, structural data, contacts, faults — all on an interactive map, without internet.
Step-by-step instructions for projects, layers, observation points, strike/dip measurements, faults, contours, attachments, and export.
A complete toolkit designed specifically for geologists working in the field — on a tablet, in any terrain, without cellular connectivity.
Place points by tapping the map or capturing GPS coordinates. Attach photos, videos, audio recordings, and documents directly to each point.
Record dip direction and dip angle with geological symbols. Strike/dip annotations are rendered on the map and scale correctly at any zoom level.
Draw polylines, splines, and Bézier curves for contacts. Define faults from one, two, or three 3D points — the app projects them onto the topographic surface automatically.
Import Copernicus DEM or custom KML surfaces. The app generates contour lines at 30 m intervals and uses elevation data for fault projection calculations.
Custom line patterns, fills, hatching — all stored in reusable reference libraries. Cut, merge, subtract, and copy geological polygons directly on the map.
Package an entire project — geometry, DEMs, attachments, line types — into a single .gfield.zip file and open it on any other device.
All project data, topography, and attachments live on the device. No internet connection required during fieldwork.
Full action history for object creation, edits, deletions, and layer operations. Redo is available for actions that support a forward payload.
Organize objects in named layers with independent visibility, label visibility, and draw order. Drag to reorder. A built-in fault layer keeps structural data separate.
A typical session from starting a new survey to sharing results with your team.
Name the project and draw the survey boundary by tapping the map, entering coordinates, or importing a KML outline.
Download Copernicus DEM for the area or import your own elevation model. The app caches it locally for offline use.
Add layers, place observation points, digitize contacts and faults, record structural measurements — all without connectivity.
Check contour projections, style your contacts, then export the whole project as a .gfield.zip to share or archive.
A complete walkthrough of the app — from project setup to geological mapping in the field.
GField Mapper is publicly available on Google Play. Start with the free trial, then continue with the Pro subscription for import, export, and professional field workflows.
GField is designed and developed by an experienced geospatial engineer, with expert validation from a consortium that has been active on international mining projects for 30 years.
A professional geological consulting and training consortium with a 30-year track record on international mining projects. Alpproject provides expert validation of GField's geological workflows, field-scenario feedback, and access to professional geological networks.