Slope geomorphic feature layer

The slope geomorphic feature layer represents the spatial extent of the slope areas 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 slope is ???the deepening sea floor out from the shelf edge to the upper limit of the continental rise, or the point where there is a general decrease in steepness??? (IHO, 2008). In this study, the foot of slope was digitised manually at a nominal spatial scale of 1:500,000 in ArcGIS based on 100 m contours and 3D viewing. ArcGIS was used to highlight zones of abrupt changes in seabed gradient (contour spacing) which suggests the foot of slope in many areas. In areas where marginal plateaus abut the margin, the foot of slope was allowed to extend offshore to encompass the plateau feature, where a clear seaward dipping gradient was apparent. Otherwise the first significant decrease in gradient encountered in a seaward direction from the shelf break was selected as the foot of slope. Note our foot of slope locations are based only on bathymetric data and our interpretation is not intended to define the foot of slope under Article 76 of the 1982 United Nations Convention on the Law of the Sea, particularly in areas of geomorphologically complex, continent-ocean transition.

Dataset extent

Map data © OpenStreetMap contributors
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Geonetwork Links
Field Value
GN_Metadata_Show http://geonetwork.d4science.org/geonetwork/srv/en/metadata.show?uuid=geo_fea_slope
GN_Metadata_Source http://geonetwork.d4science.org/geonetwork/srv/en/xml.metadata.get?uuid=geo_fea_slope
GN_URL http://geonetwork.d4science.org/geonetwork
Additional Info
Field Value
access_constraints ["no limitations"]
bbox-east-long 180.0
bbox-north-lat 84.540813
bbox-south-lat -76.516483
bbox-west-long -180.0
contact-email [email protected]
coupled-resource
[]
dataset-reference-date
[{"type": "creation", "value": "2013-06-05"}, {"type": "publication", "value": "2014-02-14"}]
frequency-of-update irregular
GUID geo_fea_slope
licence ["The global seafloor geomorphic feature map is available for download from bluehabitats.org"]
metadata-date 2014-02-05
metadata-language eng
point_of_contact Miles Macmillan-Lawler, [email protected]
resource-type dataset
responsible-party
[{"name": "GRID-Arendal", "roles": ["custodian"]}]
spatial
{"type": "Polygon", "coordinates": [[[-180.0, -76.516483], [180.0, -76.516483], [180.0, 84.540813], [-180.0, 84.540813], [-180.0, -76.516483]]]}
spatial-reference-system http://www.opengis.net/def/crs/EPSG/0/4326
spatial_harvester true
system:type Dataset
topic_category oceans
Management Info
Field Value
Author GRID-Arendal
Maintainer iMarine Catalogue Manager
Last Updated 5 April 2018, 19:26 (CEST)
Created 5 April 2018, 19:26 (CEST)