Native Oyster - Unsuitable habitat - Orkney Current
This map layer has been supplied directly by Marine Directorate NMPi. You can obtain additional information about the layer on this page
GIS files of the extent of areas in the Orkney study region that are predicted to have an unsuitable environment for native oyster restoration based on refined thresholds.
* unsuitable_depth.grd
A binary raster with 0 representing areas that are potentially suitable depth based on the refined threshold value for that variable, and 1 representing areas that are unsuitable. Cells with a value of NA were not in the extent of the study area or were beyond the extent of the source data.
* outside_PFOWmodel
A polygon shapefile of the areas that are within the Pentland Firth and Orkney Waters study region but not included in the irregular triangle grid of the Pentland Firth and Orkney Waters hydrodynamic model and therefore beyond the extent of the available environmental data.
* unsuitable_current
A polygon shapefile of the grid elements of the Pentland Firth and Orkney Waters hydrodynamic model that are considered unsuitable for native oyster based on the refined threshold of current speed.
* unsuitable_temp
A polygon shapefile of the grid elements of the Pentland Firth and Orkney Waters hydrodynamic model that are considered unsuitable for native oyster based on the refined threshold of bottom temperature.
The source of the depth was the lowest astronomical tide across the study region from EMODnet Bathymetry Consortium 2020 - tile D4. The threshold defining unsuitable depth was > 80 m.
The source for the temperature and current is the climatology of Pentland Firth and Orkney Waters hydrodynamic model.
The Scottish Shelf Re-analysis Model is available under Open Government Licence for public sector information https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/.
Attribution: O'Hara Murray, R., Campbell, L. 2021. Pentland Firth and Orkney Waters Climatology 1.02. doi: https://doi.org/10.7489/12041-1
The thresholds defining unsuitable habitat were the 95th percentile current speed over the year > 0.45 m s-1 and maximum temperature < 15 degrees C
Layer name:nmp:Orkney_Current_Unsuitable_Habitat