Title
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Glacial trough 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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70272470-a547-45b7-9714-1ebc694326c6 |
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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 glacial trough geomorphic feature layer represents the spatial extent of the glacial troughs 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). Shelf valleys at high latitudes incised by glacial erosion during
the Pleistocene ice ages form elongate troughs, typically trending across the continental shelf and extending inland as
fjord complexes (Hambrey, 1994). The largest of these features are glacial troughs, characterised by depths of over 100 m
(often exceeding 1,000 m depth) and are distinguished from shelf valleys by an over-deepened longitudinal profile that
reaches a maximum depth inboard of the shelf break, thus creating a perched basin on the shelf with an associated sill (Hambrey,
1994). Glacial troughs were digitized by hand based on 50 m contoured data for the Antarctic and 10 m contoured data for
other shelf areas.
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Purpose
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The glacial trough geomorphic feature layer represents the spatial extent of the glacial troughs 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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