Title
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Slope geomorphic feature layer |
Date
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2013-06-05 |
Date type
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Creation: Date identifies when the resource was brought into existence
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Date
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2014-02-14 |
Date type
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Publication: Date identifies when the resource was issued
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Edition
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Version 1 |
Code
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c9c1d53a-f9d6-48f5-bf5a-4d27831a7728 |
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Presentation form
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Digital map: Map represented in raster or vector form
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Abstract
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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.
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Purpose
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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 global seafloor geomorphic features map is intended to support ocean management including
feature inventories, spatial planning and biodiversity conservation.
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Credit
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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)
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Maintenance and update frequency
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Irregular: Data is updated in intervals that are uneven in duration
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Descriptive keywords
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Geology (theme). |
Descriptive keywords
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global (place). |
Descriptive keywords
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seafloor, geomorphic features, habitats (theme). |
Descriptive keywords
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Downloadable Data . |
Use limitation
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The global seafloor geomorphic feature map is available for download from bluehabitats.org |
Access constraints
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Other restrictions: Limitation not listed
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Other constraints
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no limitations |
Spatial representation type
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Vector: Vector data is used to represent geographic data
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Character set
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UTF8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646
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Topic category code
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Oceans |
Environment description
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Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.4.4000 |
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