Title
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Fan 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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e68fe24d-0379-4d38-9eca-f0bf31662453 |
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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 fan geomorphic feature layer represents the spatial extent of the fans 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). Fans are “a relatively smooth, fan-like, depositional feature normally sloping away
from the outer termination of a canyon or canyon system” (IHO, 2008). Since submarine fans are sediment deposits, the NGDC
map of global ocean sediment thickness (Divins, 2003) was used to assist with identifying them. Fans overlay and comprise
part of the continental rise and are located offshore from the base of the continental slope (Curray et al., 2002; Dowdeswell
et al., 2008; Covault et al., 2011). Fans are inter-related with submarine canyons and sediment drift deposits; in cases
where canyon axes extend across the rise, the canyon-channels may be flanked by sediment drift deposits, which have been
grouped with fans in this study. Fans are defined in the present study by 100 m isobaths that form a concentric series exhibiting
an expanding spacing in a seaward direction away from the base of the slope, sometimes clearly associated with a canyon
mouth, but also comprising low-relief ridges between canyon-channels on the abyssal plain.
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Purpose
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The fan geomorphic feature layer represents the spatial extent of the fans 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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