Vectorized Shoreline of Guam, Derived from IKONOS Satellite Imagery, 2000 through 2003

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Frequently anticipated questions:


What does this data set describe?

Title:
Vectorized Shoreline of Guam, Derived from IKONOS Satellite Imagery, 2000 through 2003
Abstract:
IKONOS imagery was purchased to support the Pacific Islands Geographic Information System (GIS) project and the National Ocean Service's (NOS) coral mapping activities. One-meter panchromatic and four-meter multispectral data were purchased for the Territory of Guam. A digital vector shoreline was manually digitized from the one-meter panchromatic imagery to provide accurate, up-to-date shoreline data for the region.
  1. How should this data set be cited?

    Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), NOAA Coastal Services Center (CSC), 200310, Vectorized Shoreline of Guam, Derived from IKONOS Satellite Imagery, 2000 through 2003: NOAA's Ocean Service, Coastal Services Center (CSC), Charleston, SC.

    Online Links:

    Other_Citation_Details:
    The vectorized shoreline data was derived from one-meter panchromatic IKONOS satellite imagery.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 144.616021
    East_Bounding_Coordinate: 144.959948
    North_Bounding_Coordinate: 13.655213
    South_Bounding_Coordinate: 13.233837

  3. What does it look like?

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

    Beginning_Date: 17-Oct-2000
    Ending_Date: 13-Oct-2003
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

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

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • String (212)

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 55
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: 147.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using Coordinate Pair
      Abscissae (x-coordinates) are specified to the nearest 0.000128
      Ordinates (y-coordinates) are specified to the nearest 0.000128
      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?

    guamshrln
    Polyline shapefile (Source: NOAA Coastal Service Center)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    Id
    Feature identification number (Source: NOAA Coastal Services Center)

    Software generated

    Length
    Length of shoreline polyline segments (Source: NOAA Coastal Services Center)

    Software generated

    Origin
    Origin of shoreline data (Source: NOAA Coastal Services Center)

    ValueDefinition
    1NOAA Coastal Services Center
    2Guam Coastal Zone Management Program

    Source
    Source of shoreline data (Source: NOAA Coastal Services Center)

    ValueDefinition
    1One-meter panchromatic IKONOS digital satellite imagery
    2USGS Digital Raster Graphics (DRG)
    3USGS Digital Ortho Quad Photos


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?

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

    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program
    Biogeography Team Leader, Mapping Manager
    1305 East West Highway
    Silver Spring, MD 20910

    301-713-3028 (voice)
    301-713-4388 (FAX)
    steve.rohmann@noaa.gov


Why was the data set created?

The Pacific Islands Geographic Information System (GIS) project is a multiyear initiative designed to increase the use of GIS and related spatial technology in the coast resource management programs of the Territories of American Samoa and Guam, the Commonwealth of the Northern Marian Islands (CNMI), and the State of Hawaii. The project will focus on personnel, training, equipment, software, data, and applications. Where appropriate, other related activities in the region will be incorporated into the effort.


How was the data set created?

  1. From what previous works were the data drawn?

    IKONOS (source 1 of 3)
    Incorporated, Space Imaging , 20001017, IKONOS Panchromatic Satellite Imagery: Space Imaging, Thornton, CO.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 3780
    Source_Contribution:
    Used to identify and digitize the shoreline (land/water interface) for Guam

    USGS DRGs (source 2 of 3)
    United States Geological Survey, 19980226, Guam Digital Raster Graphic (DRG): USGS, Reston, VA.

    Online Links:

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 24000
    Source_Contribution:
    Used to identify and digitize the shoreline (land/water interface) for areas of the coast that were obscured by cloud cover in the satellite imagery

    Digital Ortho Quads (source 3 of 3)
    United States Geological Survey (USGS), 1997, Digital Ortho Quads for Agana, Agat, and Apra: United States Geological Survey, Reston, VA.

    Other_Citation_Details:
    USGS Digital Ortho Quads were supplied by the National Park Service.
    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 2835
    Source_Contribution:
    Used to identify and digitize the shoreline (land/water interface) for locations where the coast was obscured by cloud cover in the satellite imagery

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

    Date: 23-Sep-2003 (process 1 of 2)
    During the vectorization process, the satellite imagery was displayed on a computer screen using ESRI's ArcGIS 8.2 software. In order to obtain the highest degree of accuracy from the imagery, the one-meter panchromatic imagery was used as a base layer for digitizing. In an effort to better visualize the land-water interface, the one-meter imagery was overlaid on top of the four-meter multispectral imagery using a 35 % transparency value. The near-infrared band (Band 4) was used in the display of the multispectral imagery. The resultant base layer contained the one-meter resolution of the panchromatic imagery and the colorization of the four-meter imagery. The display was zoomed to the image resolution of the panchromatic imagery and the shoreline was manually digitized. All lines are coded with length, ID, origin, and source.

    Note - Areas of the shoreline that were obscured by cloud cover in the satellite imagery were digitized from USGS Digital Raster Graphics (DRGs). The USGS DRGs for Guam were adjusted in the x and y directions using ERDAS Imagine 8.5 to match the IKONOS imagery. IKONOS imagery used were collected 20001017, 20001130, 20010511, 20010511, 20010514, 20021111, 20021114, 20030105, 20030116. This step began 20020905 and ended 20030923.

    Person who carried out this activity:

    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), NOAA Coastal Services Center (CSC)
    Pacific Islands GIS Specialist
    2234 South Hobson Avenue
    Charleston, South Carolina 29405

    843-740-1200 (voice)
    843-740-1224 (FAX)
    csc@csc.noaa.gov

    Hours_of_Service: Monday through Friday, 0800 to 1700, EST
    Date: 13-Oct-2003 (process 2 of 2)
    Further modification of the Guam shoreline was conducted by staff within the Guam Coastal Zone Management Program and modified by staff of the NOS Biogeography Program. ArcView 3.2 was used to adjust shapefile vector vertices. Most alterations were done by combining the visual information available within the one-meter panchromatic imagery of Guam together with local knowledge of the coastline, and some Digital Ortho Quad (USGS DOQ) data.

    Person who carried out this activity:

    Guam Coastal Management Program
    Attn: James Byrne
    P.O Box 2950
    Hagatna, Guam 96932
    USA

    671-472-4201 (voice)
    671-477-1812 (FAX)
    jbyrne@mail.gov.gu

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


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

  1. How well have the observations been checked?

  2. How accurate are the geographic locations?

    The data were created by delineating the shoreline off of IKONOS panchromatic digital satellite imagery collected in 2000 - 2003. The horizontal resolution of the digital imagery is 1 meter. The original scale of the imagery was 1:3780. During orthorectification of the IKONOS imagery, 73 ground control points were used to determine the circular error (CE) at a 90% confidence level. For Pacific Islands, Guam, IKONOS data, 2002 the circular error is 8.5 meters for the panchromatic data set.

  3. How accurate are the heights or depths?

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

    This shoreline dataset of Guam is dependent on the shoreline as delineated on 2001 through 2003 IKONOS digital satellite imagery from Space Imaging, LLC. The position of the shoreline might change as the natural land changes or better maps and more recent imagery become available.

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

    These data are believed to be logically consistent, though no tests were performed. All arcs were snapped by the nodes to create consistently tied strings without node dangles. Line geometry is topologically clean.


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:
Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable within the state of the art, NOAA cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data, or as a result of the data to be used on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

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

    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Program
    Biogeography Team Leader, Mapping Manager
    1305 East West Highway
    Silver Spring, MD 20910

    301-713-3028 (voice)
    301-713-4388 (FAX)
    steve.rohmann@noaa.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?

    Users must assume responsibility to determine the appropriate use for these data. Disclaimer- While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 08-Sep-2014
Metadata author:
National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), NOAA Coastal Services Center (CSC)
Pacific Islands GIS Specialist
2234 South Hobson Avenue
Charleston, South Carolina 29405

843-740-1200 (voice)
843-740-1224 (FAX)
csc@csc.noaa.gov

Hours_of_Service: Monday through Friday, 0800 to 1700, EST
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


Generated by mp version 2.9.13 on Fri Dec 26 10:44:03 2014