- Thumbnail
- Resource ID
- 4c8f4910-d2dc-11e7-8864-000d3ab6a624
- Title
- Seamount geomorphic feature layer
- Date
- Feb. 20, 2014, midnight, Publication
- Abstract
- The seamount geomorphic feature layer represents the spatial extent of the seamounts of the worlds oceans based on interpretation of the SRTM30 plus v7 global bathymetry model. The layer is one of the 25 layers that make up the global seafloor geomorphic features map (Harris et.al. 2014). Seamounts are “a discrete (or group of) large isolated elevation(s), greater than 1,000 m in relief above the sea floor, characteristically of conical form” (IHO, 2008). Seamounts are thus defined as peaks that rise over 1,000 m above the seafloor, calculated based on the SRTM30_PLUS model. We adhered strictly to the requirement that seamounts are “of conical form”, thus distinguishing “seamounts” (having a length/with ratio <2) from ridges (having a length/width ratio ≥2). The criterion of a length/with ratio <2 for seamounts is consistent with the geomorphic analysis of Mitchell (2001). Seamounts are, furthermore, distinguished from flat-topped guyots.
- Edition
- --
- Owner
- miles_GRIDA
- Point of Contact
- Macmillan-Lawler
- miles.macmillan-Lawler@grida.no
- Purpose
- The seamount geomorphic feature layer represents the spatial extent of the seamounts of the worlds oceans based on interpretation of the SRTM30 plus v7 global bathymetry model. The layer is one of the 25 layers that make up the global seafloor geomorphic features map (Harris et.al. 2014). The global seafloor geomorphic features map is intended to support ocean management including feature inventories, spatial planning and biodiversity conservation.
- Maintenance Frequency
- asNeeded
- Type
- vector
- Restrictions
- None
- The global seafloor geomorphic feature map is available for download from bluehabitats.org
- License
- None
- Language
- eng
- Temporal Extent
- Start
- --
- End
- --
- Supplemental Information
- No information provided
- Data Quality
- Data is based on the SRTM version 8 bathymetric data model. This has been supplemented with the AusBathygrid05 from Geoscience Australia. The base resolution of the bathymetric grid is 1km pixel size. The minimum size of geomorpic features identified is approximately 10 km2. See Harris et.al. 2004. Geomorphology of the Ocean for more details.
- Extent
-
- long min: -180.0000000000
- long max: 180.0000000000
- lat min: -75.2333303625
- lat max: 77.0846968802
- Spatial Reference System Identifier
- EPSG:4326
- Keywords
- no keywords
- Category
- Geoscientific Information
- Regions
-
Global