Integrated hard and soft bottom seafloor substrate map of Ofu-Olosega, American Samoa, combining NOAA Pacific Island Fisheries Science Center Coral Reef Ecosystem Division hard-soft substrate map with NOAA Center for Coastal Monitoring and Assessment Biogeography Program shallow-water benthic habitat map of American Samoa.
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Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator:
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Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- Publication_Date: 20130125
- Title:
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Integrated hard and soft bottom seafloor substrate map of Ofu-Olosega, American Samoa, combining
NOAA Pacific Island Fisheries Science Center Coral Reef Ecosystem Division
hard-soft substrate map with NOAA Center for Coastal Monitoring and Assessment
Biogeography Program shallow-water benthic habitat
map of American Samoa.
- Geospatial_Data_Presentation_Form: digital data
- Online_Linkage:
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http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_ofu_geomorph.htm
- Online_Linkage: https://www.soest.hawaii.edu/pibhmc/cms/
- Description:
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- Abstract:
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Hard and soft seafloor substrate map, derived from integrating
two existing map products: hard and soft seafloor substrate map
derived from an unsupervised classification of multibeam backscatter and
bathymetry derivatives, produced by NOAA Pacific Island Fisheries Science Center
Coral Reef Ecosystem Division (CRED), and shallow-water benthic habitat map
of American Samoa, produced by NOAA Center for Coastal Monitoring and Assessment
Biogeography Program. Please refer to separate metadata and documentation for these two products:
Substrate - hard bottom vs. soft bottom - 5 meter grid http://www.soest.hawaii.edu/pibhmc/pibhmc_amsamoa_ofu_geomorph.htm
Shallow-water benthic habitat map http://ccma.nos.noaa.gov/ecosystems/coralreef/us_pac_terr/
This data is for Ofu-Olosega Islands, Territory of American Samoa, USA.
- Purpose:
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The hard and soft seafloor map previously produced by NOAA Pacific Islands
Fisheries Science Center Coral Reef Ecosystem Division is being used to improve
sampling techniques for long-term ecosystem monitoring, to guide
future ground-truthing operations and to identify coral-rich and
species specific environments. By combining this initial product with the
shallow-water benthic habitat map produced by NOAA Biogeography Branch,
a more complete hard and soft substrate map is produced, which fills in
many of the gaps in shallow water.
- Supplemental_Information:
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The hard and soft substrate map produced by NOAA Pacific Islands
Fisheries Science Center Coral Reef Ecosystem Division was derived
using Reson 8101 backscatter data, bathymetric variance (at 2 scales)
and bathymetric rugosity. The sonar frequency is 240 kHz for the Reson
8101 multibeam data. Bathymetry and backscatter data were resampled to
5 m grid cell size prior to the classification. As limited seafloor
photographs for groundtruthing were available for Ofu-Olosega at the time
of production, the classification was unsupervised. However, in locations
such as French Frigate Shoals, NWHI and Tutuila, American Samoa, where
ground truth data were available, the unsupervised classification method
has been found to be a good predictor of substrate type in similar depth
ranges and seafloor environments.
The shallow-water habitat map produced by NOAA Biogeography Branch was
derived by digitally delineating habitat boundaries from georeferenced
sonar and orthorectified IKONOS satellite imagery in ArcGIS using the
NOAA Habitat Digitizing extension. A first draft map was completed, and
areas identified for ground validation. At each ground validation point
benthic habitat was characterized by drop camera, free diving or surface
observation. A second draft map was produced incorporating the ground
validation data.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Range_of_Dates/Times:
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- Beginning_Date: 2002
- Ending_Date: 2010
- Currentness_Reference: ground condition
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: As needed
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -169.705274
- East_Bounding_Coordinate: -169.583687
- North_Bounding_Coordinate: -14.133505
- South_Bounding_Coordinate: -14.203385
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: NCEI Geoportal Filter
- Theme_Keyword: CoRIS_Metadata
- Theme:
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- Theme_Keyword_Thesaurus: CRCP Project
- Theme_Keyword:
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Benthic Habitat Mapping and Characterization in the Pacific Islands Region
- Theme_Keyword: 467
- Theme:
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- Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus
- Theme_Keyword:
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EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology > Habitats
- Theme_Keyword:
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EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping
- Theme_Keyword:
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EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping > Geomorphology Mapping
- Theme_Keyword:
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EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Mapping > Habitat Mapping
- Theme:
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- Theme_Keyword_Thesaurus: ISO 19115 Topic Category
- Theme_Keyword: imageryBaseMapsEarthCover
- Theme_Keyword: 010
- Theme:
-
- Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
- Theme_Keyword: Geographic Information > Habitats
- Place:
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- Place_Keyword_Thesaurus: CoRIS Place Thesaurus
- Place_Keyword: OCEAN BASIN > Pacific Ocean > Manu'a Group > Ofu (14S169W0002)
- Place_Keyword:
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COUNTRY/TERRITORY > United States of America > American Samoa > Ofu Island > Ofu (14S169W0002)
- Place_Keyword:
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OCEAN BASIN > Pacific Ocean > Manu'a Group > Ofu Island (14S169W0013)
- Place_Keyword:
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OCEAN BASIN > Pacific Ocean > Manu'a Group > Olosega (14S169W0016)
- Place_Keyword:
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COUNTRY/TERRITORY > United States of America > American Samoa > Olosega Island > Olosega (14S169W0016)
- Place_Keyword:
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OCEAN BASIN > Pacific Ocean > Manu'a Group > Olosega Island (14S169W0014)
- Place_Keyword:
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COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Olosega Island (14S169W0014)
- Place_Keyword:
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COUNTRY/TERRITORY > United States of America > American Samoa > American Samoa > Ofu Island (14S169W0013)
- Place:
-
- Place_Keyword_Thesaurus: CoRIS Region
- Place_Keyword: AmSam
- Access_Constraints: None
- Use_Constraints:
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These data are not to be used for navigation purposes.
Please acknowledge the NOAA Coral Reef Ecosystem Division,
Pacific Islands Fisheries Science Center and the Pacific Islands Benthic
Habitat Mapping Center, School of Ocean and Earth Science and Technology, University
of Hawaii as the sources of this information.
- Point_of_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization:
-
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: NOAA IRC
- Address: NMFS/PIFSC/CRED
- Address: 1845 WASP Blvd., Building 176
- City: Honolulu
- State_or_Province: HI
- Postal_Code: 96818
- Country: USA
- Contact_Voice_Telephone: 808 725-5360
- Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
- Browse_Graphic:
-
- Browse_Graphic_File_Name:
-
http://www.soest.hawaii.edu/pibhmc/amsamoa_images/ofu_5m_hs_int_445.jpg
- Browse_Graphic_File_Description: Hard and Soft Seafloor Substrate
- Browse_Graphic_File_Type: JPEG, PDF
- Data_Set_Credit:
-
PIBHMC, CRED, PIFSC, NOAA, JIMAR, NOS, NCCOS, CCMA, Biogeography Program
- Security_Information:
-
- Security_Classification_System: Not applicable
- Security_Classification: Unclassified
- Security_Handling_Description: Not applicable
- Data_Quality_Information:
-
- Attribute_Accuracy:
-
- Attribute_Accuracy_Report:
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Data are collected for resource
management and research purposes and are tested for internal
consistency; however, no effort is made to compare these data to
external references or to other published data.
- Logical_Consistency_Report:
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These data are believed to be logically
consistent though no tests were performed
- Completeness_Report: Complete
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report:
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Horizontal positioning system: GPS (SPS)
Horizontal position accuracy: 25 meters
- Lineage:
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- Process_Step:
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- Process_Description:
-
The process description to produce the CRED hard-soft substrate map
can be found in the metadata for that product:
Substrate - hard bottom vs. soft bottom - 5 meter grid
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/benthichabitatlayers/OO_5m_hardsoft.txt
The process description to produce the Biogeography Program
shallow-water benthic habitat map can be found in the metadata
for that product:
https://products.coastalscience.noaa.gov/collections/benthic/e99us_pac/
To combine the two maps, several steps had to be first taken
with the Biogeography Program shallow-water benthic habitat map.
First polygons were deleted that were not required for this product;
the polygons covering Ta'u were deleted, leaving only Ofu-Olosega.
Then polygons where the Major Reef Structure (M_STRUCT) was either
'Unknown' or 'Other Delineations' were deleted, leaving only polygons
where M_STRUCT was 'Coral Reef and Hardbottom' or 'Unconsolidated Sediment.'
The polygon shapefile was then converted into an ArcGIS Raster, using the
ArcGIS tool, 'Polygon To Raster.'The raster values were checked to ensure
that the same value was equivalent to hard substrate as in the
CRED hard-soft map, where 'Coral Reef and Hardbottom' was classed as 'hard'
and 'Unconsolidated Sediment' was classed as 'soft'.
Prior to the combing the maps, a low-pass filter was run over the CRED hard-soft substrate
map using the ArcGIS Spatial Analyst Tool, Filter.
To combine the two maps, the two raster layers were
mosaiced, using the ArcGIS tool, 'Mosaic To New Raster.'
Due to a wide area of overlap between the two datasets, it was necessary to make a
decision on how to treat the two datasets in these areas. As the two datasets
were produced from different methods, and from different underlying data (multibeam
bathymetry versus satellite imagery) there were naturally discrepancies between the
two datasets, particularly obvious along the reef edge north of Ofu-Olosega. Below
the reef slope which runs along the island, the NOAA Biogeography Branch habitat
map shows soft substrate, following along the contour of the base of the reef
slope. In contrast the CRED hard-soft substrate map shows predominantly hard
substrate with soft substrate in patches. Examination of three towed-camera sled
dives, collected during cruise SB1216 in November 2012, showed that in two locations
the CRED hard-soft substrate map provided a better representation of the surface
substrate, whereas in the third, the Biogeography Branch habitat map provided a
better representation while the CRED hard-soft substrate map under-represented
soft substrate in this area. A pragmatic decision was taken to mosaic the two
datasets using the 'FIRST' method of the ArcToolbox Tool 'Mosaic to new raster'
where the CRED hard-soft substrate map was the 'first' raster in the mosaic.
This meant that where there was overlap between the two datasets, the CRED
hard-soft substrate map was used, and the NOAA Biogeography Branch habitat
map was used to fill in gaps. However, even using this method, artifacts in the
data remain, notably, along the boundary between the two datasets north west of
Olosega. It should also be borne in mind that in some areas the CRED hard-soft
map may under-represent soft sediment at the surface, particularly if there is
rocky substrate underlying the soft sediment.
- Process_Date: 20121205
- Spatial_Data_Organization_Information:
-
- Direct_Spatial_Reference_Method: Raster
- Raster_Object_Information:
-
- Raster_Object_Type: Grid Cell
- Row_Count: 1532
- Column_Count: 2915
- Vertical_Count: 1
- Spatial_Reference_Information:
-
- Horizontal_Coordinate_System_Definition:
-
- Planar:
-
- Grid_Coordinate_System:
-
- Grid_Coordinate_System_Name: Universal Transverse Mercator
- Universal_Transverse_Mercator:
-
- UTM_Zone_Number: -2
- Transverse_Mercator:
-
- Scale_Factor_at_Central_Meridian: 0.9996
- Longitude_of_Central_Meridian: -171
- Latitude_of_Projection_Origin: 0
- False_Easting: 500000
- False_Northing: 10000000
- Planar_Coordinate_Information:
-
- Planar_Coordinate_Encoding_Method: row and column
- Coordinate_Representation:
-
- Abscissa_Resolution: 5
- Ordinate_Resolution: 5
- Planar_Distance_Units: meters
- Geodetic_Model:
-
- Horizontal_Datum_Name: D_WGS_1984
- Ellipsoid_Name: WGS_1984
- Semi-major_Axis: 6378137.000000
- Denominator_of_Flattening_Ratio: 298.257224
- Vertical_Coordinate_System_Definition:
-
- Depth_System_Definition:
-
- Depth_Datum_Name: mean lower low water
- Depth_Resolution: 0.01
- Depth_Distance_Units: meters
- Depth_Encoding_Method: Attribute values
- Entity_and_Attribute_Information:
-
- Overview_Description:
-
- Entity_and_Attribute_Overview: none
- Entity_and_Attribute_Detail_Citation: none
- Distribution_Information:
-
- Distributor:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization:
-
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: NOAA IRC
- Address: NMFS/PIFSC/CRED
- Address: 1845 WASP Blvd., Building 176
- City: Honolulu
- State_or_Province: HI
- Postal_Code: 96818
- Country: USA
- Contact_Voice_Telephone: 808 725-5360
- Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
- Resource_Description: Downloadable Data
- Distribution_Liability:
-
These data are not to be used for navigational purposes.
NOAA makes no warranty regarding these data, expressed or
implied, nor does the fact of distribution constitute such a
warranty. NOAA 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.
- Standard_Order_Process:
-
- Digital_Form:
-
- Digital_Transfer_Information:
-
- Format_Name: Arc ASCII
- Format_Information_Content:
-
Arc ASCII can be converted to Arc Raster
using ArcToolbox Conversion Tools (ASCIItoRaster).
- Digital_Transfer_Option:
-
- Online_Option:
-
- Computer_Contact_Information:
-
- Network_Address:
-
- Network_Resource_Name:
-
ftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/benthichabitatlayers/ofu_5m_hs_int.zip
- Fees: None
- Metadata_Reference_Information:
-
- Metadata_Date: 20220504
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization:
-
Pacific Islands Benthic Habitat Mapping Center (PIBHMC), Coral Reef Ecosystem Division (CRED), Pacific Islands Fisheries Science Center (PIFSC), National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: NOAA IRC
- Address: NMFS/PIFSC/CRED
- Address: 1845 WASP Blvd., Building 176
- City: Honolulu
- State_or_Province: HI
- Postal_Code: 96818
- Country: USA
- Contact_Voice_Telephone: 808 725-5360
- Contact_Electronic_Mail_Address: nmfs.pic.credinfo@noaa.gov
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: universal time
- Metadata_Access_Constraints: None
- Metadata_Use_Constraints: None
- CoRIS:
-
- CoRIS_Metadata_Link:
-
https://www.coris.noaa.gov/metadata/records/html/ofu_5m_hs_int.html
- CoRIS_Tracking_ID: 6622
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