utm_prtbckgnd.tif - Caribbean Regional Background Imagery for Puerto Rico Trench Featured Data, UTM Zone 19 WGS84 Datum

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Frequently-anticipated questions:


What does this data set describe?

Title:
utm_prtbckgnd.tif - Caribbean Regional Background Imagery for Puerto Rico Trench Featured Data, UTM Zone 19 WGS84 Datum
Abstract:
This composite shaded relief image dataset depicts generalized bathymetry and topography of the Caribbean region.
Supplemental_Information:
The image was created for aesthetic purposes only and should not be used for analysis or navigation. Check the data quality portion of this document before using the image in other projects. Exports between ArcGIS and graphics programs may have degraded original data quality, while georeferencing can affect original horizontal accuracy of data. A smooth gradient technique was used on data to emphasize color and variability of surfaces. Also note that every keyword place name may or may not be noted.
  1. How should this data set be cited?

    U.S. Geological Survey, 2005, utm_prtbckgnd.tif - Caribbean Regional Background Imagery for Puerto Rico Trench Featured Data, UTM Zone 19 WGS84 Datum: Open-File Report 2005-1066, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    French, Christopher D. , and Christopher J. Schenk, 2004, Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Caribbean Region: Open-file Report 97-470-K, U.S. Geological Survey, Central Energy Resources Team, Denver, Colorado, USA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -79.058946
    East_Bounding_Coordinate: -53.719735
    North_Bounding_Coordinate: 24.327981
    South_Bounding_Coordinate: 9.882876

  3. What does it look like?

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

    Calendar_Date: 2004
    Currentness_Reference: publication date

  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 1696 x 2818 x 1, type Pixel

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -69.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 922.238000
      Ordinates (y-coordinates) are specified to the nearest 922.238000
      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?

    Band_1
    color encoded image

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Red

    Green

    Blue


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?

    Christopher D. French (USGS) and Christopher J. Schenk (USGS) for creating the source image.

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

    Christopher J. Schenk
    U.S. Geological Survey, Central Energy Resources Team
    Caribbean Regional Coordinator for World Energy Project
    U.S. Geological Survey, Box 25046, MS 939, Denver Federal Center
    Denver, Colorado 80225-0046
    USA

    303-236-5796 (voice)
    303-236-0459 (FAX)
    schenk@usgs.gov


Why was the data set created?

The dataset was created as a means to display shaded relief information in the cartographic products for U.S. Geological Survey Open-File Report 97-470-K, Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Caribbean Region. The image is a composite of two individual datasets: 30 arc-second topographic grid data (GTOPO30) and 1- minute bathymetric grid data (GEBCO). The image was considered suitable for this type of display at a scale of 1:2,670,000. It is provided for others who may wish to compile a mapping project in the region.


How was the data set created?

  1. From what previous works were the data drawn?

    BODC-GEBCO (source 1 of 1)
    British Oceanographic Data Center, 2003, General Bathymetric Chart of the Oceans (GEBCO): General Bathymetric Chart of the Oceans 1903-2003 Centenary Edition, British Oceanographic Data Centre, Liverpool, England.

    Online Links:

    Other_Citation_Details:
    Full citation for publication: IOC, IHO, and BODC, 2003, "Centenary Edition of the GEBCO Digital Atlas", published on CD-ROM on behalf of the Intergovernmental Oceanographic Commission and the Hydrographic Organization as part of the General Bathymetric Chart of the Oceans; British Oceanographic Data Centre, Liverpool.
    Type_of_Source_Media: CD-ROM
    Source_Contribution: Bathymetric depth grids.

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

    Date: Jun-2003 (process 1 of 5)
    Created hillshade for GTOPO30 DEM with azimuth of 315 degrees and sun angle of 45 degrees. All settings left at default.

    Data sources used in this process:

    • USGS

    Date: Jun-2003 (process 2 of 5)
    Opened GEBCO and GTOPO30 shaded relief layers in ArcGIS ArcMap and exported at high-resolution setting in PDF format.

    Data sources used in this process:

    • USGS

    Date: Jul-2003 (process 3 of 5)
    Exported DEM layer in grayscale for use as transparent gradient overlay.

    Data sources used in this process:

    • USGS

    Date: Jul-2003 (process 4 of 5)
    Used Adobe Photoshop to add smooth color gradient to DEM layer with transparency and drape over the shaded relief layers. Exported composite as JPEG image with highest quality setting (12).

    Data sources used in this process:

    • USGS

    Date: 2005 (process 5 of 5)
    Georeference of imagery (UTM, Zone 19) using georeferencing toolbar; distortion of imagery subject to symmetry of raster and vector data layers. This converted imagery should not to be used in analysis.

    Person who carried out this activity:

    Glynn Williams
    U.S. Geological Survey
    Information Technician (GIS/Geo)
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    508-548-8700 x2290 (voice)
    508-457-2310 (FAX)
    gwilliams@usgs.gov

    Hours_of_Service: M-F; 8:00 AM to 5:00 PM
  3. What similar or related data should the user be aware of?

    Open-file Report 2004-1400, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.


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

  1. How well have the observations been checked?

    Attributes only convey RGB values of individual cells. No other attributes were added.

  2. How accurate are the geographic locations?

    No horizontal positional accuracy quantified. Accuracy largely based on original source data. A brief description is provided below.

    Original 30 arc-second global topographic (GTOPO30) data accuracy varies by location because sources are chosen on the best available for the area, and use a total of eight sources worldwide. Sources could be raster or vector, with more accuracy claimed from the raster sources. The exact source(s) of the data for the extent shown in the Caribbean region were not determined. Horizontal accuracy is considered to be no greater than the spatial resolution of 1000 meters.

    The second dataset is a compilation of bathymetric data provided by the British Oceanographic Data Centre in their General Bathymetric Chart of the Oceans (GEBCO) product. A wide variety of sources and scales were used by the data provider to digitize contours for use in the 1-minute grid product. Horizontal accuracy is considered to be no greater than the spatial resolution of 2000 meters. The graphical merging process, where GEBCO 1-minute data were combined with GTOPO30 topographic data, introduced additional error through exporting to a compressed JPEG image format. The JPEG format uses a lossy compression technique to reduce file size at the sacrifice of image quality.

  3. How accurate are the heights or depths?

    No elevation or depth information provided in data.

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

    Complete

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

    Dataset is a compilation of two published datasets which are also compilations from various sources. Accuracy depends upon the stated accuracies of original data in addition to introduced error from merging processes.


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:
Not to be used for navigation purposes. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution.

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

    USGS Information Services
    Box 25286 Denver Federal Center
    Denver, Colorado 80225
    USA

    1-888-ASK-USGS (voice)
    303.202.4693 (FAX)
    ask@usgs.gov

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Although these data sets are used by the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by NOAA or the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA or the USGS in the use of these data.

  4. How can I download or order the data?


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

    Uri ten Brink
    U.S. Geological Survey
    Research Scientist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    508.548.8700 x2396 (voice)
    508.457.2310 (FAX)
    utenbrink@usgs.gov

    Hours_of_Service: 8:00 AM to 4:30 PM; M - F
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 16-Jun-2005
Last Reviewed: 2004
Metadata author:
Christopher French
U.S. Geological Survey, Central Energy Resources Team, Data Management Project
GIS Specialist
U.S. Geological Survey, Box 25046, MS 939, Denver Federal Center
Denver, Colorado 80225
USA

303-236-1655 (voice)
datamgt@usgs.gov

Contact_Instructions:
For inquiries regarding this document, please include the metadata contact person's name, dataset name, and publication series and number.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.8.6 on Wed Aug 24 14:28:42 2005