Title
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Shelf 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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d7733bec-0ecd-4ff7-a4f1-f185032eb527 |
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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 shelf geomorphic feature layer represents the spatial extent of the shelf 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 continental shelf is defined by IHO (2008)as “a zone adjacent to a continent (or
around an island) and extending from the low water line to a depth at which there is usually a marked increase of slope
towards oceanic depths”. The low-water mark is taken in this study as the 0 m depth contour. The shelf break (i.e. the
line along which there is marked increase of slope at the seaward margin of a shelf) was digitised manually at a nominal
spatial scale of 1:500,000 in ArcGIS based on 10 m, 50 m and 100 m contours, depending on the slope and bathymetric profile
of the region. In most cases 100 m contours were sufficient at the selected scale of 1:500,000 to identify the shelf break.
However, where there was a gradual break in slope over a broad area, more closely spaced contours were used. Floating ice
shelves cover large sections of the Antarctic continental shelf and these areas were simply left blank.
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Purpose
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The shelf geomorphic feature layer represents the spatial extent of the shelf 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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