GPS (global positioning system) mark point determining method as well as GPS trajectory optimization method and device

An embodiment of the invention discloses a GPS (global positioning system) mark point determining method as well as a GPS trajectory optimization method and device. The GPS mark point determining method comprises steps as follows: step S100, collecting and storing position data and pose data of a vehicle; step S200, calculating an angular difference value between current pose data and previous pose data; step S300, judging whether the angular difference value is equal to a preset angle threshold or is in a preset angle threshold range; step S410, marking current position data as a turning mark point when the angular difference value is equal to the preset angle threshold or is in the preset angle threshold range; step S420, calculating a turning distance difference value between the current turning mark point and a previous turning mark point; step S440, deleting the previous turning mark point when the turning distance difference value is smaller than a preset turning distance threshold. According to the tec