NCCOS Shoreline for the Republic of Palau - Derived from IKONOS Imagery, 2003-2006

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Frequently anticipated questions:


What does this data set describe?

Title:
NCCOS Shoreline for the Republic of Palau - Derived from IKONOS Imagery, 2003-2006
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 map the coral reef habitats of Palau by visual interpretation and manual delineation of IKONOS satellite imagery. A two tiered habitat classification system was used in this work. The scheme integrates geomorphologic reef structure and biological cover into a single scheme and subsets each into detail. It also includes thirteen zones. This shapefile was created from the shoreline digitized during this process.
  1. How should this data set be cited?

    Miles Anderson, Analytical Laboratories of Hawaii, 2007, NCCOS Shoreline for the Republic of Palau - Derived from IKONOS Imagery, 2003-2006: Analytical Laboratories of Hawaii, Kailua, Hawaii.

    Online Links:

    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, 2007, Benthic Habitats of Palau prepared from IKONOS Satellite Imagery: NOAA's Ocean Service, National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 134.119145
    East_Bounding_Coordinate: 134.721933
    North_Bounding_Coordinate: 8.172380
    South_Bounding_Coordinate: 6.887938

  3. What does it look like?

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

    Beginning_Date: 2003
    Ending_Date: 2006
    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):

      • G-Polygon (617)

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 53
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: 135.000000
      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 0.000256
      Ordinates (y-coordinates) are specified to the nearest 0.000256
      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?

    Palau_Shoreline
    Shapefile attribute table (Source: None)

    COVER
    Concatenated field of major cover and percent cover used for legend fill (Source: ArcView script)

    Character field

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    UNIQUEID
    4 digit numerical value representing a unique habitat combination of structure and cover attributes (Source: Habitat digitizing extension)

    Formal codeset
    Codeset Name:Habitat description
    Codeset Source:Habitat classification scheme for the Pacific

    POLYGONID
    Incremental value generated for QA/QC adjacency test (Source: ArcView script)

    Incremental numeric field

    AREA
    Area of polygon (Source: ArcView script)

    Range of values
    Minimum:56.842
    Maximum:464535353.569
    Units:meters

    PERIMETER
    Perimeter of polygon (Source: ArcView script)

    Range of values
    Minimum:28.928
    Maximum:1055231.686
    Units:meters

    ACRES
    Area of polygon in acres (Source: ArcView script)

    Range of values
    Minimum:0.014
    Maximum:114786.686
    Units:acres

    M_STRUCT
    Major reef structure (Source: Habitat digitizing extension)

    Assigned during digitizing character field

    D_STRUCT
    Detailed structure (Source: Habitat digitizing extension)

    Assigned during digitizing character field

    M_COVER
    Major biological cover (Source: Habitat classification scheme)

    Assigned during digitizing

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    P_COVER
    Percent biological cover of major cover type (Source: Habitat classification scheme)

    Assigned during digitizing character field

    ZONE_
    Geomorphological zone (Source: Habitat Classification scheme)

    Assigned during digitizing character field

    Area_sqkm
    area of polygon in kilometers (Source: None)

    Variable


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

    Hours_of_Service: 0800 - 1700, Monday to Friday, EST


Why was the data set created?

The National Ocean Service is conducting a map production effort 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?

    Classification Scheme for Benthic Habitats of the Pacific (source 1 of 3)
    Coyne, M.S., 2003, Classification Scheme for Benthic Habitats of the Pacific: NOAA's Ocean Service, National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.

    Type_of_Source_Media: Report
    Source_Contribution:
    This document identified the zone, structure and biological cover types attributed in the data set

    Habitat Digitizer (source 2 of 3)
    Buja, Ken, 2003, Coral Reef Digitizing Extension: NOAA's Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.

    Online Links:

    Type_of_Source_Media: computer program
    Source_Contribution:
    This ArcView extension was used to digitize and attribute benthic zones, structure and biological cover of this map.

    IKONOS imagery (source 3 of 3)
    Inc., Space Imaging , 2007, IKONOS Satellite Imagery: Space Imaging Inc., Thornton, CO.

    Other_Citation_Details:
    This imagery was obtained at a 4 m pixel resolution, corrected for water column and atmospheric effects, deglinted and Pan sharpened to one meter resolution.
    Type_of_Source_Media: Digital on external hard drive
    Source_Contribution: Used to identify and digitize benthic habitats for Palau.

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

    Date: 2005 (process 1 of 1)
    Benthic habitat maps were digitized by delineating habitat boundaries from georeferenced orthorectified IKONOS satellite imagery loaded into ArcView 3.3 GIS software with the Image Analysis and NOAA Coral Reef Habitat Digitizing extensions both activated. Digitizing was conducted using heads-up on computer screen methods with the minimum mapping unit (MMU) set to 1 acre and the image scale at 1:6,000 or less.

    All IKONOS imagery was processed by NOAA prior to map production. The imagery was corrected for atmospheric and water column effects, pan sharpened and deglinted. During the digitizing process, images were stretched and contrast, brightness and color balance were modified using the Arc View Image Analysis Extension to enhance features in the processed imagery. The overall map production plan includes a first draft map completed with features in the imagery where uncertainties existed, due to confusing or difficult to interpret signatures, identified for future ground validation effort. An ArcView GIS point theme was generated with points positioned on the features of uncertain habitat type or along transects though gradients between habitat types. The GIS points are converted to GPS waypoints using Trimble Pathfinder Software and are navigated to in the field using a Trimble GeoExplorer 3 GPS data logger. A benthic habitat characterization is conducted at each site by use of a tethered video camera snorkeling, free diving, or where water depth and clarity permitted, by observation from the surface. GPS data were collected at each location and site ID, depth, habitat type, zone and the method used to make the assessment are recorded. A second draft of the map is generated incorporating these ground validation data. This is a draft 1 map product. Though the product is topologically clean and meets NOAA GIS standards, attribute accuracy is at an interim level of production and will be considerably modified prior to draft 2 and final publication.

    Data sources used in this process:

    • C:\DOCUME~1\Owner\LOCALS~1\Temp\xml7F.tmp

  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?

    This interim GIS polygon product was generated from eleven regions of Palau which, when combined, constitute the entire Palau Archipelago. A statistical analysis that generates a Tau statistic will be performed. The Tau statistic for the major classes exceeded 0.85 and exceeded 0.75 for detailed classes. Overall thematic accuracy exceeded 85 percent for major classes and 75 percent for detailed classes.

  2. How accurate are the geographic locations?

    RMS from digitized output was determined using the ESRI RMEer2 extension and shown to be less than 1m when conducted at 1:6000 scale.

  3. How accurate are the heights or depths?

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

    NOAA supplied georeferenced imagery to Analytical Laboratories of Hawaii Delineation of all habitat boundaries was conducted with the image scale at 1:6,000 or less. The minimum mapping unit (MMU) for identifying habitats or features was 1 acre. The software utilized in this project was designed to alert the photo interpreter each time a polygon was drawn smaller than the MMU. When this occurred the photo interpreter has the choice whether to include the polygon in the data set. Only in areas where local coral reef managers expressed interest in specific map classes or in Marine Protected Areas or for areas of land were polygons of smaller then the MMU allowed. Furthermore, land features were delineated with the MMU restriction removed.

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

    All mapping was conducted from orthorectified IKONOS satellite imagery provided by NOAA prior to map production. IKONOS satellite imagery was corrected for atmospheric and water column effects, color balanced, pan sharpened and deglinted. During the digitizing process, image stretches and manipulating image contrast, brightness and color balance were performed in the ArcView Image Analysis Extension to enhance features in the processed imagery.

    GIS topologic quality was established by executing ArcView extension routines that check for: overlapping polygons, multipart polygons, sliver polygons, void polygons and zone attribute check. Additionally checks for adjacent polygons with the same habitat attributes were completed. All errors were identified and corrected. This file is believed to be logically consistent.


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 for navigation

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

    Hours_of_Service: 0800 - 1700, Monday to Friday, 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?

    The National Oceanic and Atmospheric Administration (NOAA) National Centers for Coastal Ocean Science (NCCOS) produced this data CD-ROM. NCCOS Biogeography Program does not guarantee the accuracy of the geographic features or attributes. Please see the metadata records for each data set for complete information on the source, limitations, and proper use. NOAA makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. NOAA and NODC cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    Contact NOAA for distribution options (see Distributor).


Who wrote the metadata?

Dates:
Last modified: 31-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
Biogeography Team Leader, Mapping Manager
1305 East West Highway
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 Tue Sep 2 10:41:39 2014