{
    "identifier": "gov.noaa.ngdc.mgg.geophysics:G01428",
    "accessLevel": "public",
    "contactPoint": {
        "@type": "vcard:Contact",
        "fn": "Your contact point",
        "hasEmail": "mailto:[email protected]"
    },
    "programCode": [
        "010:000"
    ],
    "landingPage": "",
    "title": "Principal Hawaiian Islands Geoid Heights (GEOID96)",
    "description": "This 2' geoid height grid for the Principal Hawaiian Islands is distributed as a GEOID96 model. The computation used 61,000 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.html We are particularly grateful to NGA (former National Imagery and Mapping Agency) for their assistance and their data contributions.",
    "language": "",
    "distribution": [
        {
            "@type": "dcat:Distribution",
            "mediaType": "application\/json",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ngdc.mgg.geophysics%3AG01428"
        },
        {
            "@type": "dcat:Distribution",
            "mediaType": "text\/html",
            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ngdc.mgg.geophysics%3AG01428\/html"
        },
        {
            "@type": "dcat:Distribution",
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            "accessURL": "https:\/\/www.ncei.noaa.gov\/metadata\/geoportal\/\/rest\/metadata\/item\/gov.noaa.ngdc.mgg.geophysics%3AG01428\/xml"
        }
    ],
    "bureauCode": [
        "010:04"
    ],
    "modified": "2025-11-19T16:16:03.127Z",
    "publisher": {
        "@type": "org:Organization",
        "name": "Your Publisher"
    },
    "theme": "",
    "keyword": [
        "EARTH SCIENCE>SOLID EARTH>Geodetics\/Gravity>Control Surveys",
        "EARTH SCIENCE>SOLID EARTH>Geodetics\/Gravity>Gravitational Field",
        "EARTH SCIENCE>SOLID EARTH>Geodetics\/Gravity>Gravity",
        "EARTH SCIENCE>SOLID EARTH>Geodetics\/Gravity>Reference Systems",
        "EARTH SCIENCE>SOLID EARTH>Geodetics\/Gravity>Satellite Orbits",
        "Absolute Gravity",
        "Bouguer Gravity",
        "Free Air Anomaly",
        "Gridded Gravity",
        "Land Gravity",
        "Observed Gravity",
        "ICSU-WDS > International Council for Science - World Data System",
        "North and Central America>United States>Hawaii",
        "Oceania>Hawaiian Islands",
        "Continent>North America>United States of America>Hawaii",
        "DOC\/NOAA\/NESDIS\/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce",
        "DOC\/NOAA\/NESDIS\/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce",
        "geoscientificInformation"
    ]
}