{
    "tag": 16215,
    "title": "Nahant to Gloucester, Massachusets Depth to Bedrock (bedrock_depth)",
    "pubdate": "2005",
    "sername": null,
    "series_name": null,
    "issue": "2005-1293",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/whcmsc\/open_file_report\/ofr2005-1293\/bedrock_metadata.faq.html",
    "format": null,
    "email": null,
    "descript": "These data are high-resolution seismic reflection profile data of the seafloor offshore of Massachusetts, from Nahant to Gloucester.  Approximately 1,175 kms of seismic reflection profile data were collected using a Knudsen 320b chirp system  Data were processed using SIOSEIS (Scripps Institute of Oceanography) and Seismic Unix (Colorado School of Mines) to produce segy files and jpg images of the profiles.  Data were then imported into Landmark SeisWorks, an interactive computer system where horizons were interpreted and digitized to calculate depth to reflectors below the seafloor.  Interpreted depth to reflectors were calculated, exported every 5 shots, and then imported to ArcGIS for interpolation into a 50-m raster grid.  These data were used to generate a sediment isopach map, which shows the total thickness of sediment that overlies bedrock",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Andrews, Brian D.",
            "role": "Author"
        },
        {
            "name": "Barnhardt, Walter A.",
            "role": "Author"
        },
        {
            "name": "Butman, Bradford",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "459",
            "name": "geologic structure",
            "scope": "General position of rocks in an area, and geometrical relationships among rocks."
        },
        {
            "thcode": 2,
            "code": "474",
            "name": "geospatial datasets",
            "scope": "Collections of related digital information that are geographically referenced."
        },
        {
            "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": "2079",
            "name": "scientific interpretation",
            "scope": "Application of scientific judgment as to the meaning of observations or models. Use for interpretations that are provided in formats similar to data, such as geospatial data."
        },
        {
            "thcode": 15,
            "code": "006",
            "name": "elevation",
            "scope": "Height above or below sea level, for example altitude, bathymetry, digital elevation models, slope, derived products, DEMs, TINs"
        },
        {
            "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"
        }
    ],
    "place_term": [],
    "image": [],
    "fan": []
}