Patent ID: 8731825
Filing Date: 2014-05-20
Classification: G01C

Abstract:
1. A trajectory display device comprising: a display element for displaying a trajectory of a moving body and a map; a current position detector for detecting a current position of the moving body successively; a memory for storing the current position successively so that a plurality of position data is stored; and a position determination processing device for determining a plurality of certain actual distance trajectory points and a plurality of direction change points based on the position data stored in the memory, wherein the certain actual distance trajectory points are arranged at every actual distance, wherein the actual distance is defined by a first scale of the map displayed on the display element in such a manner that the actual distance in case that the first scale of the map is small is longer than the actual distance in case that the first scale of the map is large, wherein the moving body changes a moving direction at each direction change point, wherein the display element displays the trajectory including the certain actual distance trajectory points and the direction change points, which is overlapped over the map, wherein each direction change point is different from the certain actual distance trajectory points, wherein the position determination processing device selects a part of the position data stored in the memory as candidate points of each direction change point, wherein a distance between two adjacent candidate points is narrower than a distance between two adjacent certain actual distance trajectory points, wherein the position determination processing device further selects three successive candidate points, and wherein the position determination processing device determines based on a traveling direction change at a center of the three successive candidate points whether the center of the three successive candidate points is the direction change point.