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Short Citation:
National Centers for Coastal Ocean Science, 2022: Detailed Maps Depicting the Shallow-Water Benthic Habitats of the Northwestern Hawaiian Islands Derived from High Resolution IKONOS Satellite Imagery, https://www.fisheries.noaa.gov/inport/item/39290.

Item Identification

Title: Detailed Maps Depicting the Shallow-Water Benthic Habitats of the Northwestern Hawaiian Islands Derived from High Resolution IKONOS Satellite Imagery
Short Name: detailed_map_nwhi
Status: Completed
Publication Date: 2002-12-31
Abstract:

Detailed, shallow-water coral reef ecosystem maps were generated by 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 among 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.

Purpose:

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. This project was conducted in support of the U.S. Coral Reef Task Force (http://www.coris.noaa.gov).

Notes:

563

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
Geospatial Platform OceanCommunity
ISO 19115 Topic Category environment
ISO 19115 Topic Category oceans
None benthic
None coral
None environmental monitoring
None habitat
None oceans
None reef
None satellite imagery
None SAV
None seagrass

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None French Frigate Shoals
None Kure Atoll
None Laysan Island
None Lisianski Island
None Maro Reef
None Midway Atoll
None Necker Island
None Nihoa Island
None Northwestern Hawaiian Islands
None Pearl and Hermes Atoll
None United States

Physical Location

Organization: National Centers for Coastal Ocean Science
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: raster digital data
Entity Attribute Overview:

Benthic features were assigned one of thirty habitat types ranging from sand to coral. A complete description of these classification categories can be found in the NWHI_class_scheme PDF file (http://ccma.nos.noaa.gov/ecosystems/coralreef/nwhi/pdf/NWHI_class_scheme.pdf). DETAILED HABITAT TYPE = Habitat_name, Habitat_classification_code, Numeric_value, Red_color_value, Green_color_value, Blue_color_value Habitat_name: The name of the benthic habitat identified and depicted. Habitat_classification_code: A hierarchical, 4-digit code assigned to each habitat type. Numeric_value: A two- or three-digit numeric value assigned to each habitat type. Red_color_value: A numeric value ranging from 0-255 assigned to the red channel of the RGB color palette. Green_color_value: A numeric value ranging from 0-255 assigned to the green channel of the RGB color palette. Blue_color_value: A numeric value ranging from 0-255 assigned to the blue channel of the RGB color palette

Distribution Liability:

not to be used for navigation

Data Set Credit: NOAA, University of Hawaii, U.S. Fish and Wildlife Service

Support Roles

Data Steward

CC ID: 464615
Date Effective From: 2002-12-31
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Distributor

CC ID: 464617
Date Effective From: 2002-12-31
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Metadata Contact

CC ID: 464618
Date Effective From: 2002-12-31
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Point of Contact

CC ID: 464616
Date Effective From: 2002-12-31
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Principal Investigator

CC ID: 464619
Date Effective From: 2002-12-31
Date Effective To:
Contact (Person): Stumpf, Richard
Email Address: richard.stumpf@noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 464622
W° Bound: -179
E° Bound: -160
N° Bound: 29
S° Bound: 22

Extent Group 1 / Time Frame 1

CC ID: 464621
Time Frame Type: Range
Start: 2000
End: 2002

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

These maps are NOT to be used for navigation. These detailed habitat maps of the shallow-water benthic habitats of the Northwestern Hawaiian Islands have been reviewed by numerous decision makers and scientists familiar with the Northwestern Hawaiian Islands region.

Distribution Information

Distribution 1

CC ID: 464623
Download URL: http://ccma.nos.noaa.gov/ecosystems/coralreef/nwhi/
Distributor:
Description:

Downloadable Data

File Type: geotiff

URLs

URL 1

CC ID: 464614
URL: http://ccma.nos.noaa.gov/ecosystems/coralreef/nwhi/
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 464648
Activity Date/Time: 2013-10-22
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 464647
Activity Date/Time: 2017-04-05
Description:

Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 584358
Activity Date/Time: 2017-09-13
Description:

Partial upload of Spatial Info section only.

Activity Log 4

CC ID: 600981
Activity Date/Time: 2017-11-01
Description:

Replaced entire Lineage section to populate new Source Contribution field.

Activity Log 5

CC ID: 716631
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Data Quality

Accuracy:

The accuracy assessment was performed on the aggregated cover benthic habitat maps only. This was due to the relatively few site-specific benthic characterization data available for the Northwestern Hawaiian Islands. A statistic based accuracy assessment was performed using a subset of the 1,130 site-specific benthic characterization data (376 points were used in the accuracy assessment) available for the NWHI. The overall accuracy of the aggregated cover maps was 72 percent (Kappa Statistic 0.59, Tau Coefficient 0.62), and ranged from 94 percent accuracy for unconsolidated sediment with little or no algae or seagrass to 9% for unconsolidated sediment with seagrass present.

Horizontal Positional Accuracy:

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.

Vertical Positional Accuracy:

none reported

Completeness Report:

High-resolution satellite imagery was analyzed using rule-based, semi-automated, digital image analysis techniques to produce benthic habitat maps of the Northwestern Hawaiian Island. In total, 1,130 site specific examples of the spectral and spatial characteristics of differing habitats were available and incorporated into the analysis process for the NWHI. The minimum mapping unit (MMU) for identifying habitats or features was 100 sq. m. Generally, features to a depth of approximately 30 m can be analyzed from the satellite imagery. Due to the depth of water surrounding Gardner Pinnacles, very little characterization of the benthic habitats of Gardner Pinnacles was possible. No satellite imagery was available for Gambia shoals.

Conceptual Consistency:

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 bathymetry transect data. Once maps were positioned, validation was performed by comparison to repositioned vector shoreline data depicted on recently-revised NOS nautical charts. The draft classified benthic habitat maps were reviewed by scientists in Hawaii with first-hand local knowledge of the Northwestern Hawaiian Islands. Comments were received and incorporated into draft maps. Draft maps also underwent a statistics-based accuracy assessment.

Lineage

Sources

IKONOS Panchromatic and Multispectral Imagery for the Northwestern Hawaiian Islands

CC ID: 600982
Contact Name: Space Imaging
Publish Date: 2002-01-01
Extent Type: Range
Extent Start Date/Time: 2000
Extent End Date/Time: 2001
Citation URL: http://www.spaceimaging.com/
Source Contribution:

high resolution satellite imagery was analyzed to produce benthic habitat maps of the Northwestern Hawaiian Island | Type of Source Media: IKONOS high-resolution satellite imagery

Process Steps

Process Step 1

CC ID: 600983
Description:

High resolution satellite imagery was analyzed using rule-based, semi-automated, digital image analysis techniques to produce benthic habitat maps of the Northwestern Hawaiian Island. Following careful evaluation of the digital satellite imagery, selected sites were visited in the field for typological validation. This validation included: (1) areas in the satellite imagery with confusing or difficult to interpret spectral signatures, (2) transects across many representative habitat types occurring in different depths and water conditions, (3) a survey of the Zones, and (4) confirmation of preliminary habitat delineations after a first draft habitat map was produced. Navigating to field sites was accomplished in a variety of ways including uploading position coordinates from the mosaic into an onboard GPS and navigating to those waypoints, using an onboard PC connected to GPS allowing navigation using digital nautical charts or the mosaic, and visual navigation using landmarks visible in the satellite imagery. On most occasions, field activities were conducted with the guidance of local experts. Satellite imagery was used in the field to facilitate comparison of signatures in the imagery to actual habitats at each site. Individual sites were visually evaluated by snorkeling and free diving or directly from the boat in shallow, clear water. Habitat transitions were evaluated by swimming transects across habitat types to further guide placement of habitat boundaries. Habitat type(s), zone, approximate depth, position (GPS), image number, and other descriptive information were recorded at each site. Field data for each site were then compiled into a text table with GPS position fields to allow overlay of the field information on the mosaic and habitat maps. Where depth and water clarity permitted, the satellite images were used to navigate across multiple bottom features allowing continuous confirmation of habitat types and transitions between each site.Process Date Range is 2001 - 2002

Process Date/Time: 2002-01-01 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity Northwestern Hawaiian Islands Classification Scheme

Catalog Details

Catalog Item ID: 39290
GUID: gov.noaa.nmfs.inport:39290
Metadata Record Created By: Tyler Christensen
Metadata Record Created: 2017-04-05 12:51+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2018-02-08
Owner Org: NCCOS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-02-08
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-02-08