Abstract:
From 1986 through 1989, the USGS and IOS (Institute of Oceanographic Sciences, U.K.) scientists conducted several surveys within the U.S. EEZ off Alaska. Four surveys during that time period focused on the Bering Sea region. 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 sea-floor. The results of these surveys were 30 digital mosaics of a 2 degree by 2 degree area with a 50-meter pixel resolution.
Purpose:
This remote sensing image of the sea-floor is a reduced-resolution (250-meter) composite mosaic of the 30 mosaics created from the Bering Sea U.S. EEZ GLORIA sidescan-sonar data.
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19860706
Ending_Date: 19870728
Currentness_Reference:
ground condition with the following date ranges: 19860706 to 19860728, 19860806 to 19860901, 19860903 to 19860930, and 19870628 to 19870728
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:32b9328e-d91a-4e2a-aefa-1a6e8ddd6e9d
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Western Coastal and Marine Geology
Theme_Keyword: WCMG
Theme_Keyword: Geological LOng-Range Inclined Asdic
Theme_Keyword: GLORIA
Theme_Keyword: GeoTIFF image
Theme_Keyword: grey scale image
Theme_Keyword: sidescan-sonar mosaic
Theme_Keyword: composite mosaic
Theme_Keyword: backscatter
Theme_Keyword: acoustic reflectivity
Theme_Keyword: marine geology
Theme_Keyword: 250-meter
Theme_Keyword: Lambert Conformal Conic
Theme_Keyword: Exclusive Economic Zone
Theme_Keyword: EEZ
Theme_Keyword: field activity number F-2-86-BS
Theme_Keyword: field activity number F-3-86-BS
Theme_Keyword: field activity number F-4-86-BS
Theme_Keyword: field activity number F-1-87-BS
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: geoscientificInformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme:
Theme_Keyword_Thesaurus:
NASA/Global Change Master Directory (GCMD) Earth Science Keywords, Version 6.0.0.0.0
Theme_Keyword: Oceans > Ocean Acoustics > Acoustic Reflectivity
Theme:
Theme_Keyword_Thesaurus: NASA/Global Change Master Directory (GCMD) Instrument Keywords
Theme_Keyword: ACOUSTIC RECEIVERS
Theme_Keyword: GLORIA > Geological Long-Range Inclined ASDIC
Theme_Keyword: SIDE-SCAN SONAR
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: distributions
Theme_Keyword: physical habitats and geomorphology
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords
Theme_Keyword: seabed
Theme_Keyword: Exclusive Economic Zone (EEZ)
Theme_Keyword: sidescan sonar
Theme_Keyword: marine geophysics
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: sidescan sonar
Theme_Keyword: image mosaics
Theme_Keyword: marine geophysics
Theme_Keyword: sea-floor characteristics
Theme_Keyword: sea-floor acoustic reflectivity
Theme:
Theme_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard (CMECS)
Theme_Keyword: Marine Oceanic
Theme_Keyword: Continental/Island Rise
Theme_Keyword: Continental/Island Slope
Theme_Keyword: Marine Basin Floor
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Alaska
Place_Keyword: Bering Sea
Place_Keyword: Bowers Ridge
Place_Keyword: Aleutian Basin
Place_Keyword: Umnak Plateau
Place_Keyword: Zhemchug Canyon
Place_Keyword: Pribilof Canyon
Place_Keyword: Little Sitkin Island
Place_Keyword: Semisopochnoi Island
Place_Keyword: Aleutian Ridge
Place_Keyword: Bering Fan
Place_Keyword: Bering Channel
Place_Keyword: Bering Canyon
Place_Keyword: Beringian margin
Place_Keyword: Buldir Island
Place_Keyword: Attu Island
Place_Keyword: Agattu Island
Place_Keyword: Shemya Island
Place:
Place_Keyword_Thesaurus: NASA/Global Change Master Directory (GCMD) Place Keywords
Place_Keyword: Oceans > Pacific Ocean > North Pacific Ocean > Bering Sea
Place:
Place_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard (CMECS)
Place_Keyword: Aleutian Islands Ecoregion
Stratum:
Stratum_Keyword_Thesaurus: Coastal and Marine Ecological Classification Standard (CMECS)
Stratum_Keyword: Substrate
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution.
The U.S. Geological Survey (USGS) must be referenced as the originator of the dataset in any future products or research derived from these data.
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