1. A computer-implemented method for transforming mapping data, the method comprising: obtaining, by one or more computing devices, mapping data for displaying a map image, wherein the mapping data comprises data associated with a first image corresponding to a first view plane and data associated with one or more counterpart images corresponding to a second view plane, the first view plane comprising an imaginary plane formed perpendicular to a direction of a viewer's line of sight, and the second view plane being different from the first view plane; projecting, by the one or more computing devices, the obtained mapping data onto a reference view plane, the reference view plane being different from the first view plane and the second view plane; identifying, by the one or more computing devices, a user-selected view plane in which to display the map image; transforming, by the one or more computing devices, the projected mapping data to correspond to the identified user-selected view plane; and generating, by the one or more computing devices, the map image for viewing from a perspective of the user-selected view plane based on the transformed mapping data.