An AIS receiver was installed at the geographic coordinates of 44.30 °N and 8.45 °E at a height of approximately 25 m above sea level. The raw NMEA data packets and their associated database timestamp were parsed using an ad hoc service written in C# language following the NMEA AIVDM/AI...
where g is the gravity acceleration, x0 and y0 are the coordinates of the source point S, H(x0,y0) the elevation of the source point, hp(x,y) the elevation of the topographic surface at point P(x,y) and ϕp the energy angle. In Figure 2, the heights defined at the location ...