LetsGeo

Let’sGeo - Professional Geological Field Logging App

Let’sGeo is an offline-first app for geological and geotechnical logging, drilling and mineral exploration.

Designed for fieldwork and core sheds, it combines geological observations, structural measurements, drilling data and mapping. Works fully offline, with optional upload to your own servers.

Key Features

Geological & structural logging
- Field points: lithology, mineralization, alteration and weathering
- Geological codes and free-text descriptions
- Compass and clinometer for dip and dip direction
- Bedding, joints, faults, shear zones and veins
- Vein thickness, mineralogy and density
- Schmidt & Wulff stereonets

Drilling & sampling
- Drillhole runs and recovery tracking
- Interval sampling with metadata
- Geological samples linked to logging intervals

Geotechnical logging
- Single structural records linked to depth
- Interval-based geotechnical domains
- Core recovery, SCR and RQD
- Rock mass parameters and fracture angle classes
- Core boxes with depth-linked photos

Mapping & GIS
- GPS points and drillholes
- WGS-84, UTM and Gauss-Krüger coordinates
- GPS tracks and accuracy recording
- Custom markers, colors and visibility controls
- Compass-oriented maps with live azimuth
- Distance and true bearing to points and drillholes
- KMZ layers with drawing and editing tools
- KMZ layer ordering and management
- Offline satellite imagery
- Spectral maps for mineral exploration
- SWIR lithology, clay alteration and iron oxide composites
- Download spectral scenes for offline interpretation

Reference Collection
- Project-based geological reference collections
- Rock photos, descriptions and geological notes
- Import and export between projects and devices
- Reference image similarity search
- Compare field photos with reference samples
- Find similar rocks using image analysis of color, grain characteristics, textures and veins

Media & data
- Photos, video and audio linked to observations
- Geological field sketch sheets
- Photo annotation and markup
- Local offline data storage
- Full project export and import
- Project Database Archive export
- Merge archives from multiple devices
- Cross-platform exchange between Android and iOS

Connect DB - Your Own Server
- Direct project upload to your PostgreSQL database
- Optional S3-compatible storage for media
- Use your own company or project infrastructure
- Multiple geologists can upload to one shared project
- Incremental upload: add new and update changed records
- Unchanged records are skipped
- Existing server data is preserved
- Manual, one-way upload without automatic downloads
- No developer-operated cloud required

Privacy & Data Control

Let’sGeo works offline and stores project data locally. Connect DB optionally uploads data directly to your own PostgreSQL database and S3-compatible storage. No developer-operated cloud is required.

Your data. Your infrastructure. Your control.

Privacy Policy: https://letsgeo.world/privacy.php
Terms of Use (EULA): https://letsgeo.world/terms.php