AV-G31
Geoid Height (EGM2008 / EGM96)
Geoid undulation from NGA’s EGM2008 or EGM96 grid, and conversion between GPS ellipsoidal height and height above sea level.
● Runs on your device; nothing is uploadedHow to use it
- Choose EGM2008 (2.5′) or EGM96 (15′)
- Choose h → H or H → h
- Enter latitude, longitude and height under Single point
- Or paste lat, lon[, height] lines, click Convert batch, then Download CSV
Limits
- Batch lines
- 5,000
- Latitude
- -90° to 90°
Features
- NGA EGM2008 2.5′ and EGM96 15′ grids
- Same spline interpolation as NGA reference programs
- EGM2008 loads in 10° tiles only as needed
- Coordinates never leave the browser
- Batch CSV with N and the converted height
For AI agents: avtools_geoid_height
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