{
    "tag": 13157,
    "title": "GAK_Q51.TIF - Gulf of Alaska U.S. EEZ GLORIA sidescan-sonar data mosaic (21 of 30) (LCC, 50 m, WGS84)",
    "pubdate": "2011",
    "sername": null,
    "series_name": null,
    "issue": "2010-1332",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/whcmsc\/open_file_report\/ofr2010-1332\/gak_q51.tif.faq.html",
    "format": null,
    "email": null,
    "descript": "GLORIA data for the Gulf of Alaska Exclusive Economic Zone (EEZ) were acquired during five cruises over a four year period. The first cruise conducted in 1986 (F-1-86-GA) surveyed an area of the north-central mosaic area and covered an area of approximately 40,000 square kilometers (sq km). The second two cruises (F-8-88-AA, F-9-88-WG) were conducted in 1988. One of the 1988 cruises (F-8-88-AA) focused on a survey of the Aleutian Arc. The eastern most portion of that survey extended outside of the Aleutian Arc survey area and covered an area of approximately 52,000 square kilometers (sq km) of seafloor on the western edge of the Gulf of Alaska. The final two cruises (F-6-89-GA, F-7-89-EG) were completed in 1989. As in earlier EEZ reconnaissance surveys, the USGS utilized the GLORIA (Geological LOng-Range Inclined Asdic) sidescan-sonar system to complete the geologic mapping. The collected GLORIA data were processed and digitally mosaicked to produce continuous imagery of the seafloor. Thirty digital mosaics with a 50-meter pixel resolution were completed for the region.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "U.S. Geological Survey",
            "role": "Author"
        },
        {
            "name": "Paskevich, Valerie F.",
            "role": "Author"
        },
        {
            "name": "Wong, Florence L.",
            "role": "Author"
        },
        {
            "name": "O'Malley, John J.",
            "role": "Author"
        },
        {
            "name": "Stevenson, Andrew J.",
            "role": "Author"
        },
        {
            "name": "Gutmacher, Christina E.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "2046",
            "name": "image mosaics",
            "scope": "Composite images formed by overlapping existing images, typically arranged to achieve greater spatial coverage."
        },
        {
            "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": "2053",
            "name": "sea-floor acoustic reflectivity",
            "scope": "Acoustic energy received by a sonar system, providing a measure of the roughness of the sea floor."
        },
        {
            "thcode": 2,
            "code": "1025",
            "name": "sea-floor characteristics",
            "scope": "Geomorphic features and geographic, compositional, and textural variation in the materials composing the ocean floor. Includes both large-scale structures (such as seamounts and rises) and fine-scale variations in rocks and deposits on the sea floor."
        },
        {
            "thcode": 2,
            "code": "2038",
            "name": "sidescan sonar",
            "scope": "Acoustic technique for creating oblique backscatter imagery of the seafloor or lakebed."
        },
        {
            "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": "010",
            "name": "imageryBaseMapsEarthCover",
            "scope": "Base maps, for example land\/earth cover, topographic maps, imagery, unclassified images, annotations, digital ortho imagery"
        },
        {
            "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": "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": 23,
            "code": "21",
            "name": "Physical Habitats and Geomorphology",
            "scope": "Includes measures of the geologic and structural characteristics of the coast or sea floor, such as the features defined in the Geoform Component of CMECS. Distributions are detailed topographic and bathymetric maps, geolocated photographs, or sea-floor descriptions; Distributions includes maps that interpret observations to categorize areas on the basis of geoform types such as those in CMECS. Assessment types include evaluations of ecological or human use value and can include models that project environmental or economic effects of erosion, climate change, dredging, and other stressors. Predictions are the results of models or projections of future distributions, values, or ecological impacts of physical habitats, including predicted changes due to natural and human forces; they are also from scenario-based models of resource losses, gains, or impacts on ecological or economic values under different management strategies (for example, mining, removal, relocation, or the building of structures)."
        },
        {
            "thcode": 61,
            "code": "244",
            "name": "Exclusive Economic Zone (EEZ)",
            "scope": "offshore zone in which a designated nation has exclusive rights to marine resources."
        },
        {
            "thcode": 61,
            "code": "738",
            "name": "marine geophysics",
            "scope": "used for geophysical and related studies of ocean basins and margins."
        },
        {
            "thcode": 61,
            "code": "173",
            "name": "seabed",
            "scope": "the floor of a sea or ocean."
        },
        {
            "thcode": 61,
            "code": "403",
            "name": "sidescan sonar",
            "scope": "acoustic technique for producing oblique imagery of the sea floor."
        },
        {
            "thcode": 62,
            "code": "GC-039",
            "name": "Abyssal\/Submarine Fan",
            "scope": "Physiographic Setting: A low, outspread, relatively flat-to-gently sloping mass of loose material?shaped like an open fan or a segment of a cone?deposited by a flow of water at the place where it issues from a narrower or steeper-gradient area into a broader area, valley, flat, or other feature. ..."
        },
        {
            "thcode": 62,
            "code": "GC-043",
            "name": "Continental\/Island Rise",
            "scope": "Physiographic Setting: An area that lies at the deepest part of a continental or island margin between the continental slope and the abyssal plain. ..."
        },
        {
            "thcode": 62,
            "code": "GC-046",
            "name": "Continental\/Island Slope",
            "scope": "Physiographic Setting: That part of the continental margin that is between the continental shelf and the continental rise (if there is one); it is characterized by its relatively steep slope of 1.5 - 6\u00b0. ..."
        },
        {
            "thcode": 62,
            "code": "GC-052",
            "name": "Marine Basin Floor",
            "scope": "Physiographic Setting: Basin floors refer broadly to the areas of the seafloor between the base of the continental margin (usually the foot of the continental rise) and the mid-ocean ridge. ..."
        },
        {
            "thcode": 62,
            "code": "AS-006",
            "name": "Marine Oceanic",
            "scope": "Subsystem: The Marine Oceanic Subsystem represents the open ocean, extending from the continental shelf break to the deep ocean. ..."
        },
        {
            "thcode": 62,
            "code": "GC-038",
            "name": "Tectonic Trench",
            "scope": "Tectonic Setting: A narrow, elongate depression of the deep seafloor associated with a subduction zone. ..."
        }
    ],
    "place_term": [],
    "image": [
        {
            "name": "https:\/\/pubs.usgs.gov\/of\/2010\/1332\/gloria_data\/gulf_of_alaska\/browse\/gak_q51-thumb.gif",
            "description": "Thumbnail image showing an overview of the Gulf of Alaska U.S. EEZ GLORIA mosaic 51."
        }
    ],
    "fan": []
}