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General Information

File Identifier:	corisid:6943
Metadata Language:	eng; USA
Metadata Date Stamp:	2018-03-28
Organization:	National Oceanic & Atmospheric Administration, National Centers For Coastal and Ocean Science, Center for Coastal Monitoring and Assessment
Organization Role:	originator

Identification Information

Title:	Shallow-water Benthic Habitat Map (2013) for Coral Bay, St. John
Dataset Language:	eng; USA
Abstract:	This shapefile contains information about the shallow-water (<40 meters) geology and biology of the seafloor in Coral Bay, St. John in the U.S. Virgin Islands (USVI). It was created by manually delineating and classifying habitats visible in a 0.3x0.3 meter aerial photograph mosaic, and by using edge detection algorithms and boosted regression trees to automatically delineate and classify habitat features visible in 0.3x0.3 meter LiDAR surfaces. Habitat features less than 100 square meters were not delineated from the orthomosaic, and were removed from habitat polygons derived from the LiDAR surfaces using ET Geowizards ArcGIS extension. Manually delineated habitat polygons were digitized at a scale of 1:1,000. Habitat polygon boundaries derived from the LiDAR surfaces were smoothed in ArcGIS to more closely match the 1:1,000 scale used for manual digitizing. Georeferenced underwater video & photos were used to train the analyst and algorithm to classify the major and detailed geomorphological structure, percent hard bottom, major and detailed biological cover and live coral cover for each polygon. The thematic accuracy of the map was assessed qualitatively by local experts and quantitatively using randomly sampled locations stratified by detailed geomorpholoigcal structure type. Thematic accuracies for major and detailed geomorphological structure, percent hardbottom, major and detailed biological cover, live coral cover and dominant coral type were: 93.0%, 75.1%, 86.2%, 86.5%, 74.5%, 83.3% and 88.2%, respectively. These thematic accuracies are similar to the thematic accuracies reported for other NOAA benthic habitat mapping efforts around Buck Island in St. Croix (>81.4%), in St. John (>80%), in the Main Eight Hawaiian Islands (>84.0%) and in the Republic of Palau (>80.0%).
Data Type:	Vector

Data Theme

Theme Topics:

Environment and Conservation, Geological and Geophysical, Imagery and Base Maps, Oceans and Estuaries

Reference System Information

Reference System URN:	26920
Reference System Organization ID:	EPSG

Spatial Domain

West Bounding Longitude:	-64.912227
South Bounding Latitude:	18.282291
East Bounding Longitude:	-64.635668
North Bounding Latitude:	18.367313

Contact Information

Organization:	National Oceanic & Atmospheric Administration, National Centers For Coastal and Ocean Science, Center for Coastal Monitoring and Assessment
Address:	1305 East West Highway, N-SCI-1, SSMC 4
City:	Silver Spring
State:	Maryland
Postal Code:	20910
Country:	US
Contact Website:	http://coastalscience.noaa.gov/projects/detail?key=33
Telephone:	301-713-302
Fax:	301-713-4384

Distribution Information

Format Name:	Shapefile
Format Version:	March 2013
Distribution Link:	http://coastalscience.noaa.gov/projects/detail?key=33
Distribution Link Function:	Information

Metadata Reference Information

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