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Service Description: The footprint of bottom trawling was estimated from Vessel monitoring by satellite (VMS) data, linked to the corresponding logbook information (German fleet) or the European fleet register (international fleet), respectively. It is quantified as annual swept area ratio, which is the ratio between the cumulative area touched by trawls and the size of the respective grid cell (0.05°*0.05°). Thus, a swept area ratio of 1 means that an area equivalent to the size of the grid cell was fished over one year. We considered the gear-specific footprints of four major gear groups: otter trawls, demersal seines, beam trawls and dredges. Further the swept area ratio is averaged over a period from 2012-2016 and thus represents the overall picture of fishing pressure to the seafloor in those years.The second map illustrates the coefficient of variation of annual swept area ratios from 2012-2016. It thus corresponds to the map “Footprint of bottom trawling in the German EEZ of the North Sea (2012-2016)” and represents the interannual variation in fishing pressure by bottom trawling.
Map Name: Swept Area Ratio [unitless]
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Service Item Id: b8538195ea924c0487db4cd73231e5ce
Copyright Text: Thünen Institute (TI)
Spatial Reference:
4326
(4326)
Single Fused Map Cache: false
Initial Extent:
XMin: 2.8019211417542174
YMin: 54.09959151834222
XMax: 9.109621489017421
YMax: 56.166389783015006
Spatial Reference: 4326
(4326)
Full Extent:
XMin: 3.312576818065736
YMin: 53.37868078888738
XMax: 9.031055443853688
YMax: 55.94487782744983
Spatial Reference: 4326
(4326)
Units: esriDecimalDegrees
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
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Comments: The footprint of bottom trawling was estimated from Vessel monitoring by satellite (VMS) data, linked to the corresponding logbook information (German fleet) or the European fleet register (international fleet), respectively. It is quantified as annual swept area ratio, which is the ratio between the cumulative area touched by trawls and the size of the respective grid cell (0.05°*0.05°). Thus, a swept area ratio of 1 means that an area equivalent to the size of the grid cell was fished over one year. We considered the gear-specific footprints of four major gear groups: otter trawls, demersal seines, beam trawls and dredges. Further the swept area ratio is averaged over a period from 2012-2016 and thus represents the overall picture of fishing pressure to the seafloor in those years.
Subject: Footprint of bottom trawling in the German EEZ of the North Sea (2012-2016)
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Keywords: TI,Swept Area Ratio,fishery,pressureKey5,NOAH,Coefficient Variation
AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 1000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, geoJSON, PBF
Supports Query Data Elements: true
Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
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