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| Value | Definition |
|---|---|
| Reef and hardbottom | This is represented by 2 in the 1st number of the UNIQUEID. |
| Unconsolidated sediment | This is represented by 1 in the 1st number of the UNIQUEID. |
| Unknown | This is represented by 9 in the 1st number of the UNIQUEID. |
| Value | Definition |
|---|---|
| Aggregate reef | Formations with high relief and complexity, which form an extensive reef structure without sand channels (as found in spur-and-groove). Note that aggregate reef refers to the underlying hard structure and implies nothing about the nature of the biological cover, nor whether it is live or dead. This is represented by 1 in the 2nd number in the UNIQUEID. This text value is only valid if the Major structure is Reef and hardbottom (represented by a 2 in the 1st number of the UNIQUEID). |
| Aggregated patch reef | Clustered coral formations, smaller than the MMU (100 m2 in this study) or too close together to be mapped separately, that are isolated from other coral reef formations by sand, seagrass, or other habitats and that have no organized structural axis relative to the contours of the shore or shelf edge. This is represented by 4 in the 2nd number in the UNIQUEID. This text value is only valid if the Major structure is Reef and hardbottom (represented by a 2 in the 1st number of the UNIQUEID). |
| Individual patch reef | Coral formations, larger than or equal to the minimum mapping unit (MMU) (100 m2 in this study), that are isolated from other coral reef formations by sand, seagrass, or other habitats and that have no organized structural axis relative to the contours of the shore or shelf edge. This is represented by 3 in the 2nd number in the UNIQUEID. This text value is only valid if the Major structure is Reef and hardbottom (represented by a 2 in the 1st number of the UNIQUEID). |
| Pavement | Carbonate or volcanic substrate with <10 percent loose rocks or boulders scattered on the surface. Volcanic substrate may be smooth or irregular, depending on the original lava flow and subsequent erosion patterns. This is represented by 6 in the 2nd number in the UNIQUEID. This text value is only valid if the Major structure is Reef and hardbottom (represented by a 2 in the 1st number of the UNIQUEID). |
| Sand | Coarse sediment typically found in areas exposed to currents or high wave energy (reef-derived) or on beaches (land-derived or reef-derived). This is represented by 2 in the 2nd number in the UNIQUEID. This text value is only valid if the Major structure is Unconsolidated sediment (represented by a 1 in the 1st number of the UNIQUEID). |
| Spur-and-groove | Elongate, alternating sand and coral formations that are oriented perpendicular to the shore or bank/shelf escarpment. The coral formations (spurs) of this feature typically have a high vertical relief relative to the pavement with sand channels class and are separated from each other by 1–5 m of sand or bare pavement (grooves). There are no spur-and-groove formations found in this map area. This is represented by 2 in the 2nd number in the UNIQUEID. This text value is only valid if the Major structure is Reef and hardbottom (represented by a 2 in the 1st number of the UNIQUEID). |
| Unknown | This is represented by 0 in the 2nd number of the UNIQUEID. |
| Value | Definition |
|---|---|
| Coral | This is represented by 5 in the 3rd number of the UNIQUEID. |
| Macroalgae | This is represented by 2 in the 3rd number of the UNIQUEID. |
| Turf | This is represented by 6 in the 3rd number in the UNIQUEID. |
| Uncolonized | This is represented by 1 in the 3rd number of the UNIQUEID. |
| Unknown | This is represented by 0 in the 3rd number of the UNIQUEID. |
| Value | Definition |
|---|---|
| 10-<50% | This is represented by 2 in the 4th number in the UNIQUEID |
| 50-<90% | This is represented by 3 in the 4th number in the UNIQUEID |
| 90-100% | This is represented by 4 in the 4th number in the UNIQUEID |
| Unknown | This is represented by 0 in the 4th number in the UNIQUEID. |
| Value | Definition |
|---|---|
| Bank/shelf | A deep-water platform extending offshore from the seaward edge of the fore reef to the beginning of the escarpment where the insular shelf drops off into deep, oceanic water. If no reef crest is present, the bank/shelf is the flattened platform between the shoreline/intertidal zone and deeper ocean offshore. Typical habitats include sand, patch reefs, algae, colonized and uncolonized pavement with and without sand channels, and other coral habitats. |
| Bank/shelf escarpment | The edge of the bank/shelf where depth increases rapidly into deep, oceanic water. This zone begins in water depths of about 20–30 m, near the depth limit of features visible in aerial images. This zone captures the transition from the shelf to deep oceanic waters. Typical habitats include sand, aggregate reef, and spur-and-groove. |
| Channel | Naturally occurring channels that often cut across several other zones. Typical habitats include sand, mud, and uncolonized pavement. |
| Fore reef | Area from the seaward edge of the reef crest that slopes into deeper water to the landward edge of the bank/shelf platform. Fore reef is also defined as features not forming an emergent reef crest but still having a seaward-facing slope that is markedly greater than the slope of the bank/shelf. Typical habitats include aggregate coral reef and spur-and-groove. |
| Reef crest | Flattened, emergent (especially during low tides) or nearly emergent segment of a reef, usually where the waves break. This zone is between the back reef and fore reef zones of a barrier reef system, and between the reef flat and fore reef of a fringing system. Typical habitats include reef rubble, patch reefs, and aggregate reefs. |
| Reef flat | Without lagoon. Shallow, semi-exposed area between the shoreline/intertidal zone and the reef crest of a fringing reef system. This zone is protected from the high-energy waves commonly experienced on the reef crest and fore reef. The reef flat is not present if there is a lagoon. Typical habitats include sand, reef rubble, pavement, algae, mud, and patch reefs. |
| Reef hole | Area in which a visible hole is in the reef. Larger and deeper reef holes are referred to as blue holes because the deeper water inside the reef hole looks darker than the surrounding shallower water. Reef holes typically occur as a result of fresh water dissolution. |
| Range of values | |
|---|---|
| Minimum: | 29.725052 |
| Maximum: | 1158704.13728 |
| Units: | square meter |
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| Access_Constraints | No access constraints |
|---|---|
| Use_Constraints | These data are not intended for navigational purposes. USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. |
| Data format: | Zip file contains the shapefile. in format Shapefile Size: 0.96 |
|---|---|
| Network links: |
https://doi.org/10.5066/P9ICJ7CF |