Density of pleasure vessel transits, expressed in kilometres per squared kilometre, within the spatial reference EPSG: 3035 at a 10km spatial resolution and including the INSPIRE compliant cell identifier. Transit distance was calculated from the CIMA foundations AIS dynamic point data which was recorded from an antennae located at 44.30°N and 8.45°E between May 2013 and October 2014. After an initial preparation, cleaning and filtering procedure a GIS platform was used to create line transits from the positional points for each unique vessel for each day. The length of the pleasure vessel transits were then summed within each grid cell for total and monthly composites covering the North West Mediterranean Sea.
Predominant ship speed categories plot on a INSPIRE compliant grid including the cell identifier and using the spatial reference EPSG: 3035 at 5km spatial resolution. Classifications were to 4 speed categories (5-10, 10-15, 15-20 and 20 knots plus) were attributed for each cell according to the speed category with the highest relative vessel density. Vessel density expressed in kilometres per square kilometre were calculated from the CIMA foundations AIS dynamic point data which was recorded from an antennae located at 44.30°N and 8.45°E between May 2013 and October 2014. After an initial preparation, cleaning and speed classification filtering procedure a GIS platform was used to create line transits from the positional points for each unique vessel for each day. The length of the transits for each speed classification of all pleasure, passenger, cargo and tanker vessels were then summed and the grid cell classified to the speed category with the highest density.
The grid is a merge of FRANCE and ITALY grid download on EEA website. According to EEA: "The grid is based on the recommendation at the 1st European Workshop on Reference Grids in 2003 and later INSPIRE geographical grid systems." The grid covers Pelagos Sanctuary (MPA) plus 15km buffer, with a 1km cell resolution. The reference grid is based on ETRS89 Lambert Azimuthal Equal Area projection.
