Spatial predictions of the fractions of mud, sand and gravel as continuous
response variables for the north-west European continental shelf. Mud, sand
and gravel fractions range from 0-1 (i.e. 0-100%). These fractions were
generated from two additive log-ratios (ALR), ALRs and ALRm which are
independent, unconstrained response variables. These raw predictions as
rasters are also included presented in the attached dataset. Predicted
fractions have been combined to predict the likely sediment classification
based on the EUNIS level 3 sediment classification for broadscale habitats,
Folk 5, Folk 7, Folk 11 and Folk 15 classification schemes. These are
available as raster tif files with an ArcGIS layer file indicating the
appropriate class for each raster value.
For all predictions an accompanying map of the spatial distribution of
error/accuracy is also included as a separate raster. For the three components
of the sediment fraction a smoothed Root-Mean-Squared-Error layer is
available. For the classification maps a smoothed local accuracy map is
available.
