JI_250M_LCC_WGS84.TIF - Johnston Atoll U.S. EEZ GLORIA sidescan-sonar composite mosaic (LCC, 250 m, WGS84)

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Frequently-anticipated questions:

What does this data set describe?

Title:
JI_250M_LCC_WGS84.TIF - Johnston Atoll U.S. EEZ GLORIA sidescan-sonar composite mosaic (LCC, 250 m, WGS84)
Abstract:
In 1984, the U.S. Geological Survey (USGS), Office of Marine Geology, launched a program using the Geological LOng-Range Inclined Asdic (GLORIA) sidescan-sonar system to study the entire U.S. Exclusive Economic Zone (EEZ). From December 1990 through February 1991, the USGS and IOS (Institute of Oceanographic Sciences, U.K.) scientists conducted three surveys within the Johnston Atoll U.S. EEZ surrounding Johnston Island. The surveys during that time period, and conducted in succession from 6 December 1990 to 21 February 1991, focused on the U.S. Exclusive Economic Zone surrounding the Johnston Atoll. The results of these surveys were 16 digital mosaics of approximately a 2 degree by 2 degree area with a 50-meter pixel resolution.
  1. How should this data set be cited?

    U.S. Geological Survey, 2011, JI_250M_LCC_WGS84.TIF - Johnston Atoll U.S. EEZ GLORIA sidescan-sonar composite mosaic (LCC, 250 m, WGS84): Open-File Report 2010-1332, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Menlo Park, CA.

    Online Links:

    This is part of the following larger work.

    Paskevich, Valerie F. , Wong, Florence L. , O'Malley, John J. , Stevenson, Andrew J. , and Gutmacher, Christina E. , 2011, GLORIA Sidescan-Sonar Imagery for Parts of the U.S. Exclusive Economic Zone and Adjacent Areas: Open-File Report 2010-1332, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Menlo Park, CA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -173.239755
    East_Bounding_Coordinate: -164.701869
    North_Bounding_Coordinate: 21.081851
    South_Bounding_Coordinate: 12.914067

  3. What does it look like?

    <https://pubs.usgs.gov/of/2010/1332/gloria_data/johnston_island/composite/browse/ji_250m_lcc_wgs84-thumb.gif> (GIF)
    Thumbnail image showing an overview of the Johnston Atoll U.S. EEZ GLORIA composite mosaic.
    <https://pubs.usgs.gov/of/2010/1332/gloria_data/johnston_island/composite/browse/ji_250m_lcc_wgs84.gif> (GIF)
    Browse image showing an overview of the Johnston Atoll U.S. EEZ GLORIA composite mosaic.

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 06-Dec-1990,19910105,19910131
    Ending_Date: 22-Dec-1990,19910128,19910221
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: remote-sensing image

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following raster data types:

      • Dimensions 3587 x 3537 x 1, type Pixel

    2. What coordinate system is used to represent geographic features?

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Standard_Parallel: 18.000000
      Standard_Parallel: 29.000000
      Longitude_of_Central_Meridian: -170.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 0.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 250.000000
      Ordinates (y-coordinates) are specified to the nearest 250.000000
      Planar coordinates are specified in meters

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    There are no attributes associated with a GEOTIFF image. Image pixel values contain acoustic reflectivity values normalized to an 8-bit data range (0-255). Low-backscatter is represented by dark tones (low values) and high-backscatter is represented by bright tones (high values). These data have NOT been radiometrically enhanced.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    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.

  3. To whom should users address questions about the data?

    U.S. Geological Survey
    c/o Florence Wong
    Geologist
    345 Middlefield Road MS 999
    Menlo Park, CA 94025
    USA

    (650) 329-5327 (voice)
    (650) 329-5190 (FAX)
    fwong@usgs.gov

Why was the data set created?

This remote sensing image of the sea-floor is a reduced-resolution (250-meter) composite mosaic of the 16 mosaics created from the Johnston Atoll U.S. EEZ GLORIA sidescan-sonar data. Johnston Island marks the center of this circular Exclusive Economic Zone.

How was the data set created?

  1. From what previous works were the data drawn?

    Johnston Atoll U.S. EEZ GLORIA mosaics 1-16 (source 1 of 1)
    Type_of_Source_Media: disc
    Source_Contribution:
    The 16 completed 50-meter mosaics were combined to create an Lambert Conic Conformal (LCC) projection, 250-meter composite overview.

  2. How were the data generated, processed, and modified?

    Date: 03-Oct-2007 (process 1 of 3)
    An empty PCI database for the full extent of the Johnston Atoll U.S. EEZ GLORIA was defined. The imagery database was defined with a Lambert Conic Conformal (LCC) projection at a resolution of 250-meters. Standard parallels of 18 and 29 and a central longitude of -170 were selected with a WGS84 spheroid/datum.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Valerie Paskevich
    Information Specialist / GIS Coordinator, retired
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)

    Data sources produced in this process:
    • ji_250m_lcc_wgs84.pix

    Date: 03-Oct-2007 (process 2 of 3)
    Using the PCI Geomatics tool GCPworks, the 16 individual 50-meter mosaics were combined to create a composite overview of the Johnston Atoll U.S. EEZ GLORIA data at a resolution of 250-meters. The individual full-resolution GLORIA mosaics with the white flood-filled background were mosaicked together to create a single reduced-resolution composite mosaic for the Johnston Atoll U.S. EEZ. Individual mosaics were "dropped" into the composite database. No rubber sheeting or geometric corrections were applied to the mosaics. However, some mosaics were radiometrically enhanced to reduce the effect of the individual square boundaries and produce a more uniform overview image. The individual 16 mosaics were combined using a bi-linear resampling mode to reduce noise and blockiness.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Valerie Paskevich
    Information Specialist / GIS Coordinator, retired
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)

    Data sources used in this process:
    • ji_q01.tif
    • ji_q02.tif
    • ji_q03.tif
    • ji_q04.tif
    • ji_q05.tif
    • ji_q06.tif
    • ji_q07.tif
    • ji_q08.tif
    • ji_q09.tif
    • ji_q10.tif
    • ji_q11.tif
    • ji_q12.tif
    • ji_q13.tif
    • ji_q14.tif
    • ji_q15.tif
    • ji_q16.tif
    • ji_250m_lcc_wgs84.pix

    Data sources produced in this process:

    • ji_250m_lcc_wgs84.pix

    Date: 03-Oct-2007 (process 3 of 3)
    The completed reduced 250-meter mosaic was exported from the PCI database as a GeoTIFF image with associated world file.

    Person who carried out this activity:

    U.S. Geological Survey
    c/o Valerie Paskevich
    Information Specialist / GIS Coordinator, retired
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)

    Data sources used in this process:
    • ji_250m_lcc_wgs84.pix

    Data sources produced in this process:

    • ji_250m_lcc_wgs84.tif
    • ji_250m_lcc_wgs84.tfw

  3. What similar or related data should the user be aware of?

    Jr., P.S. Chavez , 1986, Processing Techniques for Digital Sonar Images from GLORIA: Photogrammetric Engineering and Remote Sensing Vol. 52, No. 8, August 1986, p. 1133-1145, American Society for Photogrammetry and Remote Sensing, Falls Church, VA 22046.

    Jr., P.S. Chavez , 1984, U.S. Geological Survey mini image processing system (MIPS): Open-File Report 84-880, U.S. Geological Survey, Reston, VA.

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    There are no attributes associated with a GEOTIFF image.

  2. How accurate are the geographic locations?

    Primary navigational control for this survey was by Loran-C supplemented by satellite navigation. Accuracy of location of the navigation fixes is estimated to be better than 100 meters.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    All available imagery were used to create this mosaic. Data were acquired during three cruises using the 6.5 kHz GLORIA sidescan-sonar system and a 45 km total swath width.

  5. How consistent are the relationships among the observations, including topology?

    not applicable

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.

  1. Who distributes the data set? (Distributor 1 of 2)

    U.S. Geological Survey
    345 Middlefield Road MS 999
    Menlo Park, CA 94025
    USA

    (650) 329-5078 (voice)
    (650) 329-5190 (FAX)

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    The sidescan-sonar mosaic is available as a GeoTIFF image with accompanying world file and georeference report. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image. If the georeferencing information cannot be imported, the user may wish to obtain the georeference information contained in a separate file included in the zip file.

  1. Who distributes the data set? (Distributor 2 of 2)

    U.S. Geological Survey
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 (voice)
    (508) 457-2310 (FAX)

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    The composite sidescan-sonar mosaic is available as a GEOTIFF image with accompanying world file and georeference report. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GEOTIFF image. If the georeferencing information cannot be imported, the user may wish to view the georeference information contained in a separate file included in the zip file.

Who wrote the metadata?

Dates:
Last modified: 22-Oct-2009
Metadata author:
U.S. Geological Survey
c/o Valerie Paskevich
Information Specialist / GIS Coordinator, retired
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 (voice)
(508) 457-2310 (FAX)

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.8 on Thu Mar 31 11:47:57 2011