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General Information

File Identifier:	gov.noaa.nmfs.inport:34310
Metadata Date Stamp:	2020-04
Organization:	Pacific Islands Fisheries Science Center
Organization Role:	resourceProvider

Identification Information

Title:	Seafloor substrate (hard and soft bottom) maps at select islands/atolls in American Samoa, Mariana Archipelago, and the Pacific Remote Island Areas
Dataset Language:	eng; US
Abstract:	Seafloor substrate (i.e., hard vs. soft bottom) from 0 to up to 50 m depths around islands/atolls in American Samoa, Mariana Archipelago, and Pacific Remote Island Areas produced by the NOAA Ecosystem Sciences Division (ESD). The islands/atolls include Tutuila, Ofu and Olosega, Tau, Rose Atoll in American Samoa; Anatahan, Maug, Aguijan, Pagan, Rota, Tinian, Saipan and Guam in the Mariana Archipelago; Howland, Jarvis, Kingman Reef, Palmyra Atoll and Johnston Atoll in Pacific Remote Islands. This is a preliminary product, derived from integrating two existing map products: hard and soft seafloor substrate maps derived from an unsupervised classification of multibeam backscatter and bathymetry derivatives produced by ESD, and shallow-water benthic habitat maps generated by the NOAA Centers for Coastal Ocean Science. The resulting maps were then updated with ESD's ground truth data, including biological survey data and benthic cover data derived from the analysis of benthic images. Production of final maps included interpolation to fill in gaps, smoothing to remove isolated pixels, and extracting the substrate data up to 50 m. For the Pacific Remote Island Areas, where no previous benthic habitat maps were available, hard and soft substrate maps were newly generated from high spatial resolution satellite images.

Browse Graphic

Browse Graphic URL:	http://www.soest.hawaii.edu/pibhmc/amsamoa_images/TUT_unspv_hardvsoft_5m_445.jpg
Browse Graphic Caption:	An example hard- and soft-bottom substrate map of Tutuila (prepared using a different methodology compared with the substrate maps prepared for the project described here).
Browse Graphic Type:	JPG

Data Theme

Theme Topics:

Biology and Ecology, Oceans and Estuaries

Spatial Domain

West Bounding Longitude:	-170.92
South Bounding Latitude:	-14.57
East Bounding Longitude:	-168.115
North Bounding Latitude:	-14.1

Data Quality Information

Scope (quality information applies to):

Dataset

Data History:

The steps in this analysis included: 1) re-categorizing all data to simple hard/soft substrates, 2) integrating all data following data prioritization rules established by accuracy assessment, 3) filling gaps in data using interpolation, and 4) extracting the data to known depth ranges for species. Several locations in the Pacific Remote Island Areas has neither the Biogeography Program shallow-water benthic habitat nor the ESD backscatter-derived hard-soft substrate maps available. Satellite images were processed for these places using the method described in Mumby and Edwards (2000) and then, unsupervised classification was applied to derive Hard and Soft substrates.

Contact Information

Address:	1845 Wasp Blvd.
City:	Honolulu
State:	HI
Postal Code:	96818
Email:	annette.desrochers@noaa.gov
Telephone:	(808)725-5461

Distribution Information

Format Name:	GeoTIFF
Distribution Link:	ftp://ftp.soest.hawaii.edu/pibhmc/website/data/amsamoa/benthichabitatlayers/tau_5m_hardsoft.zip
Distribution Link Function:	Download

Metadata Reference Information

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