GEOID90 was the first high-resolution geoid model for the United States computed at the National Geodetic Survey. It did not contain data for Alaska, Hawaii nor Puerto Rico.
GEOID90 was originally published on 5-1/4" floppy disks only. It is being made available on the web for historical, investigative purposes only. NGS recommends the use of only the latest geoid model. See the NGS geoid page to find the current model.
