Estimated Depth Maps of the Northwestern Hawaiian Islands Derived from High Resolution IKONOS Satellite Imagery (Draft)

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Frequently anticipated questions:


What does this data set describe?

Title:
Estimated Depth Maps of the Northwestern Hawaiian Islands Derived from High Resolution IKONOS Satellite Imagery (Draft)
Abstract:
Estimated shallow-water, depth maps were produced using rule-based, semi-automated image analysis of high-resolution satellite imagery for nine locations in the Northwestern Hawaiian Islands. This project is a cooperative effort between the National Oceanic and Atmospheric Administration, State of Hawaii Department of Land and Natural Resources, and the U.S. Fish and Wildlife Service to produce benthic habitat maps and georeferenced imagery for the Northwestern Hawaiian Islands. This project was conducted in support of the U.S. Coral Reef Task Force.
  1. How should this data set be cited?

    National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Remote Sensing Team, 20021231, Estimated Depth Maps of the Northwestern Hawaiian Islands Derived from High Resolution IKONOS Satellite Imagery (Draft): 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: -179.00
    East_Bounding_Coordinate: -160.00
    North_Bounding_Coordinate: 29.00
    South_Bounding_Coordinate: 22.00

  3. What does it look like?

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

    Beginning_Date: 2000
    Ending_Date: 2001
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: raster digital data

  6. How does the data set represent geographic features?

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

      Indirect_Spatial_Reference: Northwestern Hawaiian Islands
      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: 1
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -177
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 4
      Ordinates (y-coordinates) are specified to the nearest 4
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80, WGS84.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.25.

  7. How does the data set describe geographic features?

    min_depth
    The minimum depth (in feet) in this depth range. (Source: NOS - Remote Sensing Team)

    max_depth
    The maximum depth (in feet) in this depth range. (Source: NOS - Remote Sensing Team)

    Red_color_value
    A numeric value ranging from 0-255 assigned to the red channel of the RGB color palette. (Source: NOS - Remote Sensing Team)

    Green_color_value
    A numeric value ranging from 0-255 assigned to the green channel of the RGB color palette. (Source: NOS - Remote Sensing Team)

    Blue_color_value
    A numeric value ranging from 0-255 assigned to the blue channel of the RGB color palette (Source: NOS - Remote Sensing Team)

    Entity_and_Attribute_Overview:
    Estimated depth (estimated water depths in feet) were assigned either a range of numeric values or a single numeric value representative of (but not equal to) depth. These individual numeric values or ranges of numeric values were used to apply a ramped RGB color palette. Because the environment in the NWHI is very complex, two profiles of estimated depth were generated.
    Entity_and_Attribute_Detail_Citation:
    Deep-water locations (Lisianski Island, Laysan Island, Maro Reef, Necker Island, and Nihoa Island).

    RESULTS = min_depth,max_depth,red_color_value,green_color_value,blue_color_value

    _,0,255,255,255 1,2,243,251,255 3,4,227,244,255 5,6,211,238,255 7,8,195,231,255 9,10,179,225,255 11,12,162,219,255 13,14,146,212,255 15,16,130,206,255 17,18,118,201,255 _,19,102,195,255 20,21,85,188,255 22,23,69,182,255 24,25,53,175,255 26,27,37,169,255 28,29,21,162,255 30,31,5,156,255 32,33,0,151,255 34,35,0,145,252 36,37,0,138,246 _,38,0,132,241 39,40,0,126,236 41,42,0,119,230 43,44,0,113,225 45,46,0,106,219 47,48,0,102,215 49,50,0,95,210 51,52,0,89,204 53,54,0,82,199 _,55,0,76,193 56,57,0,69,188 58,59,0,63,183 60,61,0,57,177 62,63,0,50,172 64,65,0,45,168 66,67,0,39,162 68,69,0,33,157 70,71,0,26,151 72,73,0,20,146 _,74,0,13,141 75,76,0,7,135 77,78,0,0,130 79,80,0,0,126 81,82,0,0,120 83,84,0,0,115 85,92,0,0,109 93,99,0,0,100 100,109,0,0,100 110,111,0,0,95 112,116,0,0,95 117,127,0,0,90 128,138,0,0,90 139,143,0,0,90 144,200,0,0,90 201,240,0,0,0 241,241,40,0,100 242,249,0,0,0 _,250,167,133,119 251,255,0,0,0

    Entity_and_Attribute_Detail_Citation:
    Shallow-water locations (Kure Atoll, Midway Atoll, Pearl and Hermes Atoll, and French Frigate Shoals).

    RESULTS = min_depth,max_depth,red_color_value,green_color_value,blue_color_value

    _,0,255,255,255 _,1,243,251,255 _,2,227,244,255 _,3,211,238,255 _,4,195,231,255 _,5,179,225,255 _,6,162,219,255 _,7,146,212,255 _,8,130,206,255 _,9,118,201,255 _,10,102,195,255 _,11,85,188,255 _,12,69,182,255 _,13,53,175,255 _,14,37,169,255 _,15,21,162,255 _,16,5,156,255 _,17,0,151,255 _,18,0,145,252 _,19,0,138,246 _,20,0,132,241 _,21,0,126,236 _,22,0,119,230 _,23,0,113,225 _,24,0,106,219 _,25,0,102,215 _,26,0,95,210 _,27,0,89,204 _,28,0,82,199 _,29,0,76,193 _,30,0,69,188 _,31,0,63,183 _,32,0,57,177 _,33,0,50,172 _,34,0,45,168 _,35,0,39,162 _,36,0,33,157 _,37,0,26,151 _,38,0,20,146 _,39,0,13,141 _,40,0,7,135 _,41,0,0,130 _,42,0,0,126 _,43,0,0,120 _,44,0,0,115 45,48,0,0,109 49,52,0,0,100 53,57,0,0,92 58,62,0,0,85 63,68,0,0,80 69,75,0,0,72 76,80,0,0,65 81,85,0,0,60 86,92,0,0,55 93,200,0,0,50 201,240,0,0,0 241,241,40,0,100 242,249,0,0,0 250,167,133,119 251,255,0,0,0


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?

    NOAA, University of Hawaii, U.S. Fish and Wildlife Service

  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), Remote Sensing Team
    Remote Sensing Specialist
    1305 East West Highway, N/SP
    Silver Spring, Maryland 20910

    301-713-3028 (voice)
    301-713-4384 (FAX)
    Richard.Stumpf@noaa.gov

    Hours_of_Service: Monday to Friday, 0800 -1700, EST


Why was the data set created?

This project was conducted in support of the U.S. Coral Reef Task Force <http://coralreef.gov>


How was the data set created?

  1. From what previous works were the data drawn?

    NOAA/NOS/benthic characterization data (source 1 of 1)
    Imaging, Space, 2002, IKONOS Panchromatic and Multispectral Imagery for the Northwestern Hawaiian Islands: Space Imaging, Thornton, CO.

    Other_Citation_Details:
    Acquisition_Date: Gardner Pinnacles (2 swaths; 20001014) Acquisition_Date: Kure Atoll (2 swaths; first acquisition; 20001120) Acquisition_Date: Kure Atoll (2 swaths; second acquisition; 20010926) Acquisition_Date: Laysan Island (swaths 1 and 3; 20010124) Acquisition_Date: Laysan Island (swath 2; 20010215) Acquisition_Date: French Frigate Shoals (first acquisition; 4 swaths; 20001011) Acquisition_Date: French Frigate Shoals (second acquisition; swaths 1, 2, and 3; 20010911) Acquisition_Date: French Frigate Shoals (second acquisition; swath 4; 20010919) Acquisition_Date: Midway Atoll (swath 1; 20010122) Acquisition_Date: Midway Atoll (swath 2; 20010318) Acquisition_Date: Lisianski Island (3 swaths; 20001012) Acquisition_Date: Nihoa (swath 1; 20010109) Acquisition_Date: Nihoa (swath 2; 20010120) Acquisition_Date: Nihoa (swath 3; 20010418) Acquisition_Date: Pearl and Hermes Atoll (3 swaths; 20010119) Acquisition_Date: Maro Reef (3 swaths; 20010724) Acquisition_Date: Necker Island (2 swaths; 20010126)
    Type_of_Source_Media: IKONOS high-resolution satellite imagery
    Source_Contribution:
    High resolution satellite imagery was analyzed to produce estimated depth maps of the Northwestern Hawaiian Island

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

    Date: 2001 (process 1 of 1)
    Estimated depth was produced using a band-ratio procedure (see Stumpf et al., Limnology and Oceanography, 2003). The procedure uses two multispectral bands and requires very little tuning. Using this method, estimated depth can be determined in clear water to between 20- 35 meters, depending on the bottom type and water clarity. Estimated depth (estimated water depths in feet) were assigned either a range of numeric values or a single numeric value representative of (but not equal to) depth. These individual numeric values or ranges of numeric values were used to apply a ramped RGB color palette. Because the environment in the NWHI is very complex, two profiles of estimated depth were generated. The "shallow-water" RGB depth profile was applied to Kure Atoll, Midway Atoll, Pearl and Hermes Atoll, and French Frigate Shoals. The "deep-water" RGB depth profile was applied to Lisianski Island, Laysan Island, Maro Reef, Necker Island, and Nihoa Island. Because the water surrounding Gardner Pinnacles is too deep, no estimated depth was generated there.

    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), Remote Sensing Team
    Remote Sensing Specialist
    1305 East West Highway, N/SP
    Silver Spring, Maryland 20910

    301-713-3028 (voice)
    301-713-4384 (FAX)
    Richard.Stumpf@noaa.gov

    Hours_of_Service: Monday to Friday, 0800 -1700, EST
  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?

    Once maps were positioned, validation was performed by comparison to independently-acquired, trackline LIDAR data from Kure Atoll, Midway Atoll, and Pearl and Hermes Atoll. Validation also was performed by comparison to NOS nautical charts. The draft estimated depth maps were reviewed by scientists in Hawaii who have first-hand local knowledge of the Northwestern Hawaiian Islands. Comments were received and incorporated into draft maps. The absolute accuracy of estimated depth varies with water depth. The error is generally 0.3 meters for water less than 1 meter deep, + or - 15 percent in water up to 15 meters deep, and + or - 30 percent in water greater than 15 meters deep.

  2. How accurate are the geographic locations?

    Spatial data meets or exceeds national map accuracy standards for fixed features. Kure Atoll, Midway Atoll, Pearl and Hermes Atoll, Lisianski Island, Laysan Island, French Frigate Shoals, and Nihoa Island are positioned to within five (5) meters at sea level. Necker Island is positioned to within 15 meters at sea level. Maro Reef is positioned to within eight (8) meters at sea level.

  3. How accurate are the heights or depths?

    none reported

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

    High-resolution satellite imagery was analyzed to produce estimated depth maps of the North Western Hawaiian Islands. Estimated depth can be determined from imagery for clear water to between 20 m and 35 m, depending on the bottom type and absolute water clarity. Because the water surrounding Gardner Pinnacles is too deep, no estimated depth was generated there. No satellite imagery was available for Gambia Shoal.

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

    Multispectral satellite imagery was positioned using National Geodetic Survey ground control data for Kure Atoll, Midway Atoll, Pearl and Hermes Atoll, Lisianski Island, Laysan Island, French Frigate Shoals, and Nihoa Island. Satellite imagery of Necker Island was positioned using satellite ephemeris data. Satellite imagery of Maro Reef was positioned using a combination of satellite ephemeris data and supplemental depth transect data.


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:
These maps are NOT to be used for navigation. These estimated depth maps of the Northwestern Hawaiian Islands have been reviewed by numerous decision makes and scientists familiar with the Northwestern Hawaiian Islands region. Although they represent the best available characterizations of the shallow-water ecosystems of this regions the maps should be considered DRAFT versions.

  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), Remote Sensing Team
    Remote Sensing Specialist
    1305 East West Highway, N/SP
    Silver Spring, Maryland 20910

    301-713-3028 (voice)
    301-713-4384 (FAX)
    Richard.Stumpf@noaa.gov

    Hours_of_Service: Monday to Friday, 0800 -1700, EST
  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    Not to be used for navigation.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 18-Sep-2014
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), Remote Sensing Team
Remote Sensing Specialist
1305 East West Highway, N/SP
Silver Spring, Maryland 20910

301-713-3028 (voice)
301-713-4384 (FAX)
Richard.Stumpf@noaa.gov

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


Generated by mp version 2.9.13 on Mon Oct 20 10:45:14 2014