nicolas-van/egm96-universal

This JavaScript library enables conversion between EGM96-relative altitudes and WGS84 ellipsoid-relative altitudes, using bilinear interpolation on NGA-provided EGM96 sample data. It's primarily designed for developers working with geospatial applications that need to reconcile altitude references between KML files (which use EGM96) and systems like Cesium (which use WGS84). The library works in both browser and Node.js environments and is particularly useful for tasks involving altitude data conversion in geographic information systems.