{
    "tag": 7091,
    "title": "l977ar.m77t - MGD77 data file for Geophysical data from field activity L-9-77-AR in Arctic from 08\/25\/1977 to 10\/08\/1977",
    "pubdate": "2013",
    "sername": null,
    "series_name": null,
    "issue": null,
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/pcmsc\/SeriesReports\/OFR\/OFR_89-167\/1317.faq.html",
    "format": null,
    "email": null,
    "descript": "Single-beam bathymetry, magnetics, and gravity data along with transit satellite navigation data was collected as part of field activity L-9-77-AR in Arctic from 08\/25\/1977 to 10\/08\/1977, http:\/\/walrus.wr.usgs.gov\/infobank\/l\/l977ar\/html\/l-9-77-ar.meta.html  These data are reformatted from space-delimited ASCII text files located in the Coastal and Marine Geology Program (CMGP) InfoBank field activity catalog at http:\/\/walrus.wr.usgs.gov\/infobank\/l\/l977ar\/html\/l-9-77-ar.bath.html http:\/\/walrus.wr.usgs.gov\/infobank\/l\/l977ar\/html\/l-9-77-ar.grav.html http:\/\/walrus.wr.usgs.gov\/infobank\/l\/l977ar\/html\/l-9-77-ar.mag.html into MGD77T format provided by the NOAA's National Geophysical Data Center(NGDC). The MGD77T format includes a header (documentation) file (.h77t) and a data file (.m77t). More information regarding this format can be found in the publication listed in the Cross_reference section of this metadata file.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "U.S. Geological Survey",
            "role": "Author"
        },
        {
            "name": "USGS Coastal and Marine Geology Program",
            "role": "Author"
        },
        {
            "name": "Steele, William Clinton",
            "role": "Author"
        },
        {
            "name": "Degnan, Carolyn H.",
            "role": "Author"
        },
        {
            "name": "Deeter, Gary B.",
            "role": "Author"
        },
        {
            "name": "Riordan, Jean A.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "80",
            "name": "bathymetry",
            "scope": "The elevation of the earth's surface beneath a body of water, especially the ocean, typically determined by measurements of depth from the water surface."
        },
        {
            "thcode": 2,
            "code": "82",
            "name": "bathymetry measurement",
            "scope": "Means of determining the depth to the floor of a body of water, especially the ocean."
        },
        {
            "thcode": 2,
            "code": "1668",
            "name": "gravimeter measurement",
            "scope": "Use of a specialized instrument for measuring the earth's gravity at a given location."
        },
        {
            "thcode": 2,
            "code": "1669",
            "name": "magnetometer measurement",
            "scope": "Use of specialized instruments designed to measure the earth's magnetic field at a given location."
        },
        {
            "thcode": 2,
            "code": "707",
            "name": "marine geophysics",
            "scope": "Branch of earth sciences concerned with the physical processes of the oceans and continental margins.  We include here studies of large bodies of brackish and fresh water, such as lakes and rivers."
        },
        {
            "thcode": 2,
            "code": "2035",
            "name": "single-beam echo sounder",
            "scope": "Acoustic technique for determining seafloor or lakebed depth directly below the instrument platform."
        },
        {
            "thcode": 15,
            "code": "008",
            "name": "geoscientificInformation",
            "scope": "Information pertaining to earth sciences, for example geophysical features and processes, geology, minerals, sciences dealing with the composition, structure and origin of the earth's rocks, risks of earthquakes, volcanic activity, landslides, gravity information, soils, permafrost, hydrogeology, groundwater, erosion"
        },
        {
            "thcode": 15,
            "code": "014",
            "name": "oceans",
            "scope": "Features and characteristics of salt water bodies (excluding inland waters), for example tides, tidal waves, coastal information, reefs, maritime, outer continental shelf submerged lands, shoreline"
        },
        {
            "thcode": 23,
            "code": "22",
            "name": "Bathymetry and Elevation",
            "scope": "Includes measures of the height of a location above or below a reference surface. Bathymetry is the elevation of the Earth's surface beneath a body of water, especially the ocean, typically determined by measurements of depth from the water surface at mean lower low water. Distributions are topographic maps and bathymetric charts based on collected data and also include smoothed or gridded maps of bathymetry and elevation from observational data or other associated factors. Assessment data types include models of ecological value, economic value, or current rates of alterations due to erosion, accretion, climate change, and other stressors (for example, wetland habitat loss). Predictions are the results of models or projections of future distributions, values, or ecological impacts of bathymetry, including predicted changes due to natural and human forces such as erosion, deposition, sea-level rise, and dredging activities; predictions also include the results of scenario-based models of bathymetry changes under different management strategies."
        },
        {
            "thcode": 23,
            "code": "3",
            "name": "Distributions",
            "scope": "Locations or patterns of a feature of interest across space and (or) time. These data can include point data, lines, polygons, and temporal data at any scale relevant to CMSP and can be produced by observation, interpolation, or modeling. Distributions can also include maps or statistics of climatology, the environmental values that are expected to be observed at the present time."
        },
        {
            "thcode": 61,
            "code": "418",
            "name": "gravimetry",
            "scope": "measurement of the gravitational field at specific locations, yielding data that can be analyzed for a variety of scientific purposes."
        },
        {
            "thcode": 61,
            "code": "426",
            "name": "magnetic field observations",
            "scope": "measurement of the Earth's magnetic field at a specific location; often used to detect magnetic anomalies that reflect the nature and distribution of subsurface earth materials."
        },
        {
            "thcode": 61,
            "code": "738",
            "name": "marine geophysics",
            "scope": "used for geophysical and related studies of ocean basins and margins."
        },
        {
            "thcode": 61,
            "code": "404",
            "name": "single-beam echo sounder",
            "scope": "acoustic technique for determining sea-floor depth directly below the instrument platform."
        }
    ],
    "place_term": [],
    "image": [],
    "fan": []
}