The invention provides a surveying and mapping method for a movable platform (600), the movable platform (600) and a storage medium, the movable platform (600) carrying a photographing device (20, 40, 700), the method comprising: at a current position, changing the attitude of the photographing device (20, 40, 700) so that different parts of a target object are located at preset positions in a photographing window, and acquiring attitude information of the photographing device (20, 40, 700) (S11); and determining the size of the target object according to the current position and the attitude information (S12). A target object can be mapped on the basis of a movable platform (600) on which an imaging device (20, 40, 700) is mounted.