COMPUTATION OF GEOID99 GEOID HEIGHT

A GEOID99 geoid height can be computed for a specific geographic location or for a file of input points . Position coordinates should be in NAD 83 or ITRF (not NAD27).

GEOID99 will compute geoid heights for the following areas:
Area Latitude Longitude
MinMaxMinMax
Conterminous US24N58N60W130W
Alaska49N72N126W188W
Hawaii18N24N154W161W
PuertoRico/Virgin Is.15N21N64W69W

Compute a GEOID99 geoid height for a single location:

The formats below may be used for entering latitude and longitude. Degrees, Minutes, and Seconds must be separated by spaces. (Note that commas, which were valid seperators for Geoid96 computations, are not valid for Geoid99 computations.)
Degrees, minutes, and decimal seconds
Latitude Example: 35 55 19.0221
Longitude Example: 97 55 40.2351 		Degrees, minutes, and integer seconds
Latitude Example: 35 55 19
Longitude Example: 97 55 40
Degrees and decimal minutes
Latitude Example: 35 55.3453 		Degrees and integer minutes
Latitude Example: 35 55
Decimal degrees.
Latitude Example: 35.9320 		Integer degrees.
Latitude Example: 35

Enter Latitude:

Enter Longitude: West East

Compute GEOID99 geoid heights for a file of input points:

There are three choices of input format. Each input format has a corresponding file output format, most of which are text files suitable for further processing. You may use the SaveAs function of your browser to save this output file to your computer.

Choose an input format:

Free Format Type 1 [explain]
Free Format Type 2 [explain]
NGS Blue Book (*80* and *86* records) format [explain]

Specify the input file (on your computer)

Specify the longitude convention for your file: Positive West Positive East

Questions or comments on this page? Send e-mail to <a href="http://www.ngs.noaa.gov/cgi-test/redirectNOAA.prl?u=Dan.Roman>Dan Roman or call (301) 713-3202.