Predictor variables and groundtruth samples for north-west European continental shelf quantitative sediment analysis

Input data used to model sediment grain size for the north-west European continental shelf. Data includes: Sediment groundtruth observations with measured fractions of mud, sand and gravel, also converted to two additive log-ratios. These total 45761 samples. Also included are the eight predictor variables that were used to model sediment grain size. These were: Bathymetry, Bathymetric position index at a 50-pixel radii, Bathymetric position index at a 434-pixel radii, Distance from coast, Current speed at the seabed, Wave peak orbital velocity at the seabed, and suspended inorganic particulate matter for summer and winter as two separate variables.