20130410
11083100
1.0
ISO 19139 Metadata Implementation Specification
FALSE
Canyons
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180.000000
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47.251
002
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
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WGS_1984_Web_Mercator_Auxiliary_Sphere
20211006
10214700
20211006
10214700
INSPIRE
Miles Macmillan-Lawler
GRID-Arendal
Miles.Macmillan-Lawler@grida.no
Canyon 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 canyon geomorphic feature layer represents the spatial extent of the canyons 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>canyon </SPAN><SPAN>geomorphic feature layer represents the spatial extent of the </SPAN><SPAN>canyon</SPAN><SPAN>s 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>Submarine canyons are defined as “</SPAN></SPAN><SPAN><SPAN>steep-walled, sinuous valleys with V-shaped cross sections, axes sloping outward as continuously as river-cut land canyons </SPAN></SPAN><SPAN><SPAN>and relief comparable to even the largest of land canyons”</SPAN></SPAN><SPAN><SPAN>(Shepard, 1963</SPAN></SPAN><SPAN><SPAN>). “Large”</SPAN></SPAN><SPAN>canyons were mapped in this study based on the definition of Harris and Whiteway (2011), which requires canyons to extend over a depth range of at least 1,000 m and to be incised at least 100 m into the slope at some point along their thalweg. Canyon mapping in this study was based on a combination of automated and expert interpretation of the SRTM30</SPAN><SPAN /><SPAN>PLUS model. </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
canyon
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
-179.999984
180.000000
89.663310
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Canyons
Feature Class
0
The polygons represent the boundaries for the continents of the world.
ESRI
objectid
objectid
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
shape
Geometry
8
0
0
Feature geometry.
ESRI
Coordinates defining the features.
Geomorphic
Geomorphic
String
20
0
0
area_km2
area_km2
Double
8
38
8
Delta_D
Delta_D
SmallInteger
2
5
0
type
type
String
20
0
0
Mean_Depth
Mean_Depth
Double
8
38
8
Length
Length
Double
8
38
8
Width
Width
Double
8
38
8
Ocean
Ocean
String
50
0
0
Canyon_ID
Canyon_ID
String
10
0
0
st_area(shape)
st_area(shape)
Double
0
0
0
st_length(shape)
st_length(shape)
Double
0
0
0
Enterprise Geodatabase Feature Class
47.251
dataset
EPSG
6.18.3(9.3.1.2)
0
Simple
FALSE
0
TRUE
FALSE
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