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Layer: Structure (ID: 90)

Parent Layer: St Croix USVI, Buck Island (2011)

Name: Structure

Display Field: ZONE

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Fourteen distinct and non-overlapping geomorphological structure types were mapped by interpreting aerial photos, light detection and ranging (LiDAR) imagery, and four types of acoustic imagery using manual and semi-automated methods. Geomorphological structure refers to a feature’s dominant physical composition and does not address geographic location (e.g., in a Lagoon). Structure types are defined in a collapsible hierarchy ranging from three major classes (Coral Reef and Hardbottom, Unconsolidated Sediment, and Other Delineations), to fourteen detailed classes (Aggregate Reef, Aggregated Patch Reefs, Individual Patch Reef, Pavement, Pavement with Sand Channels, Reef Rubble, Rock/ Boulder, Mud, Rhodoliths, Rhodoliths with Scattered Coral and Rock, Sand, Sand with Scattered Coral and Rock, Artificial and Land). Habitats or features with areas smaller than the MMU or minimum mapping unit were not considered (i.e.,100 m2 in 0-50 m depths, 1,000 m2 in 50-1,000 m depths and 5,000 m2 in 1,000-1,830 m depths). "Unknown" indicates that the structure type was indistinguishable in the aerial orthophotos, LiDAR or acoustic imagery due interference with the signature of the seafloor.

Copyright Text: NOAA/NOS/NCCOS/MSE/Biogeography Branch

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