20140214 Version 1 vector digital data The canyon geomorphic feature layer represents the spatial extent of the canyons 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). Submarine canyons are defined as “steep-walled, sinuous valleys with V-shaped cross sections, axes sloping outward as continuously as river-cut land canyons and relief comparable to even the largest of land canyons”(Shepard, 1963). “Large”canyons were mapped in this study based on the definition of Harris and Whiteway (2011), which requires canyons to extend over a depth range of at least 1,000 m and to be incised at least 100 m into the slope at some point along their thalweg. Canyon mapping in this study was based on a combination of automated and expert interpretation of the SRTM30PLUS model. The canyon geomorphic feature layer represents the spatial extent of the canyons 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. Irregular -179.999984 180.000000 89.663310 -76.540347 None seafloor, geomorphic features, habitats ISO 19115 Topic Categories oceans None global None The global seafloor geomorphic feature map is available for download from bluehabitats.org GRID-Arendal Miles Macmillan-Lawler Miles.Macmillan-Lawler@grida.no The global seafloor geomorphic features map has been produced through a collaboration between Geoscience Australia, GRID-Arendal and Conservation International. Reference: Harris et. al. (2014) Geomorphology of the oceans.Marine Geology (in Press) Version 6.2 (Build 9200) ; Esri ArcGIS 10.5.0.6491 Vector GT-polygon composed of chains 9477 8.983152841195215e-009 8.983152841195215e-009 Decimal Degrees D WGS 1984 WGS 1984 6378137.0 298.257223563 Canyons The polygons represent the boundaries for the continents of the world. ESRI FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Geomorphic area_km2 Delta_D type Mean_Depth Length Width Ocean Canyon_ID 20190520 GRID-Arendal Miles Macmillan-Lawler Miles.Macmillan-Lawler@grida.no FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 local time