PR/VI Geoid Heights (GEOID96)View Metadata As: Get Data, FAQ, HTML, 19139 XML
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PR/VI Geoid Heights (GEOID96)
This 2’ geoid height grid for Puerto Rico and the Virgin Islands is distributed as a GEOID96 model. The computation used 26,000 terrestrial and marine gravity data held in the National Geodetic Survey gravity data base in July 1996 These data were augmented by gravity data contributions from NGA (former National Imagery and Mapping Agency (former Defence Mapping Agency)). By means of a Fast Fourier Transform (FFT) technique, high frequency corrections were made to an underlying EGM96 geopotential model through a remove, compute, and restore process. The gravity values are based on the International Gravity Standardization Net 1971 (IGSN71). The geoid heights are referred to the Geodetic Reference System 1980 (GRS80) ellipsoid. Unlike the grid for the conterminous United States, this GEOID96 grid does not incorporate GPS on leveled benchmarks. This model is a gravimetric geoid in a geocentric, ITRF94(1996.0) reference frame. It is necessary to subtract 12.0 cm from these values to obtain the geoid undulation between the best-fit global geopotential surface and the GRS80 ellipsoid (both expressed in a tide free system). Additional information is available at: http://www.ngs.noaa.gov/GEOID/geoid.htmlWe are particularly grateful to NGA (former National Imagery and Mapping Agency) for their assistance and their data contributions.

Get the Data
AccessFormat(s)Distributor(s) / Contact InfoInstructions / Constraints
http://www.ngdc.noaa.gov/mgg/fliers/se-0703.html
http://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablegri.html
http://www.ngdc.noaa.gov/mgg/gravity/1999cd.html
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DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center
DOC/NOAA/NESDIS/NGDC - National Geophysical Data Center
303-497-6826
8am-5pm, Monday through Friday
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Depends on the data set

Ordering Instructions
Ordering Instructions: Price information is available upon request. Prepay by check, money order or bank card. There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone. Custom Order Process: Contact Data Center for information.

Use Limitation
While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

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Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.

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