us_nga

us_nga_README.txt

The files in this section result from the conversion of datasets originating from US NGA

Included grids

Worldwide: EGM96 geoid model

Source: NGA
Format: GeoTIFF converted from GTX
License: Public Domain

15 minute worldwide geoid undulation grid that transforms physical heights to WGS84 ellipsoidal heights.

• us_nga_egm96_15.tif

Vertical grid: EGM2008 geoid model

Source: NGA
Format: GeoTIFF converted from GTX License: Public Domain

2.5 minute worldwide geoid undulation grid that transforms physical heights to WGS84 ellipsoidal heights.

This file has been produced by GeographicLib using the EGM2008 gravity model and can be regenerated with the build_egm08_25_gtx.sh script.

• us_nga_egm08_25.tif