JMapper
Map rock surfaces and interpret structural measurements in a free browser workspace.
All apps require a verified JWGeotech account and acceptance of the current Terms. Opening or reloading the app requires an internet connection to verify sign-in. An already authenticated tab can continue through temporary outages until its verified session expires; Browser and Native solving in JSlope and JRunout retain their licence requirements. Sign-out or session expiry locks the workspace and retains unsaved work in the tab. Signing in does not upload local project files.
JMapper maps discontinuities on imported textured rock surfaces. The model, measurements table and lower-hemisphere equal-angle stereonet share selection. Projects and calculations stay on your computer; signing into a free JWGeotech account is required and no paid licence is needed.
Use desktop Chrome or Edge. Start with Getting started, then import an OBJ model and calibrate or register it before reporting orientations or metres.
The main workflows are mapping and measurements, stereonet and sets, automatic clustering, and spacing and length analysis. Read projects and recovery before relying on autosave.