TRAJECTORY MODEL The trajectory model contains two parts; the aerodymanic model for the in-air flight and the bounce and roll model. The aerodynamical model is a proprietary state-of-art model that incorporates all the new research that has been developed from TrackMan™’s full flight and spin decay information. Especially the descending stage of the ball flight is very sensitive to a correct modeling. The settings for aerodynamical model like temperature, pressure and altitude can be changed. The bounce and roll model have settings for different turf conditions, and has been calibrated from multiple tests at various conditions.