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WGS_1984_Web_Mercator_Auxiliary_Sphere
ISO 19139 Metadata Implementation Specification
20211006
10190500
20211006
10190500
INSPIRE
Miles Macmillan-Lawler
GRID-Arendal
Miles.Macmillan-Lawler@grida.no
Glacial trough geomorphic feature layer
vector digital data
2013-06-05T00:00:00
2014-02-14T00:00:00
Version 1
Miles Macmillan-Lawler
GRID-Arendal
Miles.Macmillan-Lawler@grida.no
Global Coverage
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.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The </SPAN><SPAN>glacial trough </SPAN><SPAN>geomorphic feature layer represents the spatial extent of the </SPAN><SPAN>glacial troughs</SPAN><SPAN> 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). </SPAN><SPAN><SPAN>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. </SPAN></SPAN></P></DIV></DIV></DIV>
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)
global
seafloor
geomorphology
geomorphic feature
glacial trough
habitat
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The global seafloor geomorphic feature map is available for download from bluehabitats.org</SPAN></P></DIV></DIV></DIV>
seafloor, geomorphic features, habitats
global
Miles Macmillan-Lawler
GRID-Arendal
Miles.Macmillan-Lawler@grida.no
Esri ArcGIS 12.8.0.29751
1
-180.000000
180.000000
83.796089
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Glacial_troughs
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0
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ESRI
objectid
objectid
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
shape
Geometry
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0
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Feature geometry.
ESRI
Coordinates defining the features.
Geomorphic
Geomorphic
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area_km2
area_km2
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srMN
srMN
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st_area(shape)
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st_length(shape)
st_length(shape)
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Enterprise Geodatabase Feature Class
7.710
dataset
EPSG
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0
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FALSE
0
TRUE
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