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, Shallow-water Benthic Habitats of the Northwestern Hawaiian Islands from Aggregated Habitat Cover Maps Derived from High Resolution IKONOS Satellite Imagery (Draft): NOAA's Ocean Service, National Centers for Coastal Ocean Science (NCCOS), Silver Spring, MD.Online Links:
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.
RESULTS AGGREGATED COVER TYPE:
Habitat_name, Numeric_value, Red_color_value, Green_color_value, Blue_color_value
RESULTS DETAILED HABITAT TYPE:
Habitat_name, Habitat_classification_code (Source: NOS - Biogeography Team)
| Value | Definition |
|---|---|
| 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 |
| Value | Definition |
|---|---|
| Hardbottom with live coral (>10% cover)* (2010) | Detailed Habitat Type |
| Linear Reef with live coral (>10% cover)* (2110) | Detailed Habitat Type |
| Aggregated Coral Heads with live coral (>10% cover)* (2210) | Detailed Habitat Type |
| Patch Reef with live coral (>10% cover)* (2410) | Detailed Habitat Type |
| Aggregated Patch Reef with live coral (>10% cover)* (2510) | Detailed Habitat Type |
| Scattered Coral/Rock in sand with live coral (>10% cover)* (2610) | Detailed Habitat Type |
| Pavement with live coral (>10% cover)* (2710) | Detailed Habitat Type |
| Pavement with live coral (>10% cover) and dense (>50% cover) algae* (2712) | Detailed Habitat Type |
| Pavement with sand channels and live coral (>10% cover)* (2810) | Detailed Habitat Type |
| Volcanic Rock with live coral (>10% cover)* (2910) | Detailed Habitat Type |
| Value | Definition |
|---|---|
| Hardbottom with crustose coralline algae (>10% cover)* (2030) | Detailed Habitat Type |
| Linear Reef with crustose coralline algae (>10% cover)* (2130) | Detailed Habitat Type |
| Patch Reef with crustose coralline algae (>10% cover)* (2430) | Detailed Habitat Type |
| Pavement with crustose coralline algae (>10% cover)* (2730) | Detailed Habitat Type |
| Value | Definition |
|---|---|
| Hardbottom, uncolonized* (2020) | Detailed Habitat Type |
| Linear Reef, uncolonized* (2120) | Detailed Habitat Type |
| Patch Reef, uncolonized* (2420) | Detailed Habitat Type |
| Pavement, uncolonized* (2720) | Detailed Habitat Type |
| Pavement with sand channels, uncolonized* (2820) | Detailed Habitat Type |
| Volcanic Rock, uncolonized* (2920) | Detailed Habitat Type |
| Value | Definition |
|---|---|
| Hardbottom with sparse (10-50% cover) algae* (2001) | Detailed Habitat Type |
| Linear Reef, uncolonized with sparse (10-50% cover) algae* (2121) | Detailed Habitat Type |
| Patch Reef, uncolonized with sparse (10-50% cover) algae* (2421) | Detailed Habitat Type |
| Pavement with sparse (10-50% cover) algae* (2701) | Detailed Habitat Type |
| Pavement with dense (>50% cover) algae* (2702) | Detailed Habitat Type |
| Pavement with live coral (>10% cover) and dense (>50% cover) algae* (2712) | Detailed Habitat Type |
| Pavement, uncolonized with dense (>50% cover) algae* (2722) | Detailed Habitat Type |
| Value | Definition |
|---|---|
| Hardbottom* (2000) | Detailed Habitat Type |
| Linear Reef* (2100) | Detailed Habitat Type |
| Spur and Groove* (2300) | Detailed Habitat Type |
| Individual Patch Reef* (2400) | Detailed Habitat Type |
| Aggregated Patch Reef* (2500) | Detailed Habitat Type |
| Pavement* (2700) | Detailed Habitat Type |
| Volcanic Rock* (2900) | Detailed Habitat Type |
| Pavement with Sand Channels* (2800) | Detailed Habitat Type |
| Value | Definition |
|---|---|
| Unconsolidated sediment* (1000) | Detailed Habitat Type |
| Sand* (1100) | Detailed Habitat Type |
| Unconsolidated rubble* (1300) | Detailed Habitat Type |
| Sand and rubble* (1400) | Detailed Habitat Type |
| Groove* (1500) | Detailed Habitat Type |
| Value | Definition |
|---|---|
| Sand with macroalgae* (1120) | Detailed Habitat Type |
| Sand with patchy (10-50% cover) macroalgae* (1121) | Detailed Habitat Type |
| Sand with dense (>50% cover) macroalgae* (1122) | Detailed Habitat Type |
| Unconsolidated Rubble with sparse (10-50% cover) algae* (1301) | Detailed Habitat Type |
| Unconsolidated Rubble with dense (>50% cover) algae* (1302) | Detailed Habitat Type |
User defined - Detailed Habitat Type
User defined - Detailed Habitat Type
User defined - Detailed Habitat Type
User defined
NOAA, University of Hawaii, U.S. Fish and Wildlife Service
301-713-3028 (voice)
301-713-4384 (FAX)
Richard.Stumpf@noaa.gov
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://coralreef.gov>).
Imaging, Space, 2002, IKONOS Panchromatic and Multispectral Imagery for the Northwestern Hawaiian Islands: Space Imaging, Thornton, CO.
Person who carried out this activity:
301-713-3028 (voice)
301-713-4384 (FAX)
Richard.Stumpf@noaa.gov
Statistical analysis to determine accuracy 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. Correctly classifying benthic habitats that include algae and live coral was challenging. For example, it is difficult to separate Unconsolidated Rubble with dense (>50 percent cover) algae from Pavement with dense (>50 percent cover) algae. Also, it is difficult to separate Unconsolidated Rubble and Sand and Rubble from Pavement habitats. These challenges also were encountered when differentiating between the various habitats with live coral cover. The aggregated cover category Hardbottom with indeterminate cover was not included in the accuracy assessment. The aggregated Hardbottom with indeterminate cover includes those detailed habitat categories where a specific cover was not identified on the map, and no comparison to the field-based benthic characterization information could be performed. An assessment of the overall accuracy of the hardbottom and unconsolidated was performed. That analysis included habitat categories with indeterminate cover and their associated field-based benthic characterization data. That analysis revealed that these two habitats were correctly identified 82% and 90% of the time respectively.
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. Spatial data meets or exceeds national map accuracy standards for fixed features.
none reported
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.
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.
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 aggregated cover 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. Although they represent the best available characterizations of the shallow-water coral reef ecosystems of this region the maps should be considered DRAFT versions.
301-713-3028 (voice)
301-713-4384 (FAX)
Richard.Stumpf@noaa.gov
Downloadable Data
Not to be used for navigation.
| Data format: | geotiff |
|---|---|
| Network links: |
<http://ccma.nos.noaa.gov/ecosystems/coralreef/nwhi/> |
| Media you can order: |
CD-ROM
(format ISO 9660)
|
| Data format: | geotiff |
|---|---|
| Network links: |
<http://ccmaserver.nos.noaa.gov/ecosystems/coralreef/nwhi/> |
301-713-3028 (voice)
301-713-4384 (FAX)
Richard.Stumpf@noaa.gov