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GeoSema

Check the visualiser live: GeoSema

Magnetics: WDMAM v2.0 Gravity: WGM2012 CI

GeoSema is an interactive geophysics globe visualiser for exploring Earth's geophysical anomalies (sema, from Greek, means signals).

GeoSema was developed by Angela Rodrigues and Peter Betts at Monash University as an interactive activity for the Open Day at the School of Earth, Atmosphere and Environment.

The current prototype uses Cesium with React, Vite, and TypeScript to show global magnetic and gravity anomaly data over an interactive globe.

Current Features

  • Global magnetic anomaly overlay using WDMAM v2.0
  • Gravity anomalies using WGM2012 surface free-air gravity anomaly
  • Coastline overlay
  • Location search

Data Attribution

  • Magnetic anomaly: WDMAM v2.0
  • Gravity anomaly: WGM2012 surface free-air gravity anomaly
  • Coastlines: Natural Earth
  • Search/geocoding: OpenStreetMap/Nominatim

GeoSema is for educational use. It is not intended for navigation, operational use, or professional geophysical interpretation.

Asset Use

The deployed app uses generated PNG assets in public/.

  • public/wdmam_v2.png is generated by scripts/convert_wdmam_to_png.mjs.
  • public/gravity_wgm2012_freeair.png is the generated WGM2012 surface free-air gravity anomaly overlay.
  • public/coastlines.png is generated by scripts/make_coastlines_png.mjs.

Raw source datasets can be large and are not intended for deployment. Keep source data local, regenerate the PNG assets when needed, and deploy only the app build plus required public assets.