Hawaii Island IKONOS Imagery (421-0824) - IKONOS Imagery for the Main Eight Hawaiian Islands

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Frequently anticipated questions:


What does this data set describe?

Title:
Hawaii Island IKONOS Imagery (421-0824) - IKONOS Imagery for the Main Eight Hawaiian Islands
Abstract:
This project is a cooperative effort between the National Ocean Service, National Centers for Coastal Ocean Science, Center for Coastal Monitoring and Assessment, the University of Hawaii, and Analytical Laboratories of Hawaii, LLC. The goal of the work was to develop coral reef mapping methods and compare benthic habitat maps generated by photointerpreting georeferenced color aerial photography, hyperspectral and IKONOS satellite imagery.

The enhanced spectral resolution of hyperspectral and control of bandwidths of multispectral data yield an advantage over color aerial photography particularly when coral health and time series analysis of coral reef community structure are of interest. Multispectral (blue/green/red/near-infrared) IKONOS imagery was obtained at a four meter pixel resolution. The IKONOS imagery was processed to minimize atmospheric and water column effects. Photointerpreters can accurately and reliably delineate boundaries of features in the imagery as they appear on the computer monitor using a software interface such as the Habitat Digitizer.

  1. How should this data set be cited?

    Inc., Space Imaging , 2000, Hawaii Island IKONOS Imagery (421-0824) - IKONOS Imagery for the Main Eight Hawaiian Islands: Space Imaging, Inc., Thorton, CO.

    This is part of the following larger work.

    Department of Commerce (DOC), 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, 2002, Benthic Habitats of the Main Hawaiian Islands Prepared by Visual Interpretation from Remote Sensing Imagery Collected by NOAA Year 2000: NOAA's Ocean Service, National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -155.8633
    East_Bounding_Coordinate: -155.8188
    North_Bounding_Coordinate: 20.0557
    South_Bounding_Coordinate: 20.0115

  3. What does it look like?

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

    Calendar_Date: 2000
    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.

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 5
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -153
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using Row and Column
      Abscissae (x-coordinates) are specified to the nearest 4.0
      Ordinates (y-coordinates) are specified to the nearest 4.0
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257.

  7. How does the data set describe geographic features?


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 National Ocean Service is conducting research to digitally map biotic resources and coordinate a long-term monitoring program that can detect and predict change in U.S. coral reefs, and their associated habitats and biological communities.


How was the data set created?

  1. From what previous works were the data drawn?

    multispectral imagery (source 1 of 1)
    Inc., Space Imaging , 2000, IKONOS Satellite Imagery: Space Imaging Inc., Thornton, CO.

    Other_Citation_Details: This imagery was obtained at a 4 m pixel resolution.
    Type_of_Source_Media: IKONOS Imagery
    Source_Contribution:
    Used to identify and digitize benthic habitats for the eight main Hawaiian Islands.

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

    Date: 2002 (process 1 of 1)
    The IKONOS imagery was purchased in National Imagery Transmission Format (NITF) with the associated Rational Polynomial Coefficients (RPCs) in 11-km-wide swaths. NOS mosaiced the IKONOS imagery swaths to produce complete images of locales to within one pixel width. The IKONOS satellite imagery was processed to minimize atmospheric and water column effects. First, the raw satellite images were converted from Digital Numbers (DNs) to normalized reflectance. Normalized reflectance converts DNs into standardized, satellite-independent, comparable values. The acquisition angles (ephemeris data) of the satellite relative to the ground at the time of image acquisition were also used. Calibration coefficients for the satellite, provided by Space Imaging, were used to calculate at-satellite radiance, which was then transformed to reflectance. The normalized reflectance imagery was then transformed into water reflectance (or the signal less than 10 cm above the water surface). Water reflectance uses the near-infrared band to remove radiance attributable to atmospheric and surface effects.

    Person who carried out this activity:

    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

  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?

    All of the IKONOS imagery was purchased in National Imagery Transmission Format (NTIF) with the associated Rational Polynomial Coefficients (RPCs). When using image analysis software capable of reading NITF files with associated RPCs, the horizontal positioning error never exceeded 15 m (for locations where there is little or no vertical relief to affect image pixel displacement. The IKONOS imagery swaths, were mosaiced to within one pixel width, and were processed to minimize atmospheric effects and compensate for water column effects.

  3. How accurate are the heights or depths?

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

    The IKONOS imagery were optimized to maximize true color and during the map preparation the color was strategically manipulated to extract the most habitat information. The IKONOS satellite imagery were processed to remove atmospheric effects and compensate for water column effects.

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

    All of the IKONOS images were collected with collection angles of less than 20 degrees from nadir. Constraining the collection angle is important because positioning features on the seabed using satellite imagery is affected by refraction of light through the water column. When the collection angle is limited to less than 20 degrees, the maximum offset of seabed features would be less than 4 m in water less than 15 m deep and less than 8 m in water less than 30 meters deep.


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: None

  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?

    The National Oceanic and Atmospheric Administration (NOAA), National Centers for Coastal Ocean Science (NCCOS), Biogeography Program produced this data CD-ROM. NCCOS Biogeography Program does not guarantee the accuracy of the geographic features or attributes. 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?

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

    The user may utilize a variety of software to view the imagery mosaics (MrSID files), including ENVI, PCI, ArcGIS or ArcView 3.1 or higher and the "MrSID Image Support" Extension turned on.


Who wrote the metadata?

Dates:
Last modified: 20-Dec-2012
Metadata author:
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
Attn: Biogeography Team Leader, Mapping Manager
mailing and physical address
1305 East West Highway, N/SCI1
Silver Spring, MD 20910

301-713-3028 (voice)
301-713-4384 (FAX)
tim.battista@noaa.gov

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


Generated by mp version 2.9.13 on Sun Apr 20 10:40:26 2014