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Carbonate sand deposit model in Nordland

ÔÇó Model run in UTM zone 33N

ÔÇó The model was run in 2014 by NIVA

ÔÇó Data collected 2011-2013 by NGU, NIVA included absences from kelp surveys

ÔÇó The data were collected in Nordland county, but the models covers also a small part of Troms in the North and Tr├©ndelag in the south.

ÔÇó 1078 datapoints, but only data down to 100 m depth and with more than 50 % carbonate content were included, resulting in 473 presences.

ÔÇó Modelled using Maxent on presence data, validated with 139 presences and 740 absences (the validation points are spatially biased towards areas shallower than 40 m depth)

ÔÇó Modelled the probability of finding carbonate sand with more that 50 % carbonate content (carbonate contact below 50 % is absence together with rocky seabed and other non-carbonate sand areas)

ÔÇó Input variables: depth, slope, curvature (with both 250, 500 and 1000 m calculation window), wave exposure, maximum current speed and mean current speed

ÔÇó Depth, slope, curvature and wave exposure had spatial resolution of 25 m, models developed by NIVA. The current speed had 200 m spatial resolution (developed from NorKyst800).

ÔÇó Cut-off value for identifying polygon presences: 0.31

 spatial (horizontal) distribution is.

ÔÇó AUC=0.88 using independent validation presences and absences

Simple

Date (Publication)
2014-12-31T16:43:00
Presentation form
Digital map
Purpose

Research

Status
Completed
Point of contact
Organisation name Individual name Electronic mail address Role

NIVA

Trine Bekkby

trine.bekkby@niva.no

Owner
Maintenance and update frequency
As needed
Theme
  • Marine habitat mapping

GEMET - INSPIRE themes, version 1.0

  • Habitats and biotopes

Use limitation

No defined limitation

Access constraints
Other restrictions
Other constraints

View only - please contact data owner for access to full data

Spatial representation type
Vector
Denominator
50000
Language

eng

Character set
UTF8
Topic category
  • Environment
Begin date
2011-01-01T16:47:00
End date
2013-12-31T23:00:00
N
S
E
W
thumbnail




Vertical extent

Minimum value
-1000
Maximum value
0
Reference system identifier
EPSG:3857
Distribution format
Name Version

Web Map Service

1.0.0

OnLine resource
Protocol Linkage Name

OGC:WMS

https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms?

Carb_sand_nordland

Metadata

File identifier
35a4ff43-b7b3-4587-9829-486c32b69a40 XML
Metadata language

eng

Character set
UTF8
Date stamp
2022-04-28T16:17:52.786Z
Metadata standard name

ISO 19115:2003/19139

Metadata standard version

1.0

Metadata author
Organisation name Individual name Electronic mail address Role

NIVA

Trine Bekkby

trine.bekkby@niva.no

Point of contact
 
 

Overviews

Spatial extent

thumbnail

Keywords

Marine habitat mapping
GEMET - INSPIRE themes, version 1.0

Habitats and biotopes


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