Three-dimensional map drawing method and navigation apparatus
AssigneesHitachi, Ltd., Xanavi Informatics Corporation
InventorsMariko Okude, Yoshinori Endo, Hideo Hiroshige, Kozo Nakamura
Life of this patent
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Abstract
Whether the structure data read from the map data correspond to a non-decomposition structure or a decomposition structure, the drawing attribute of the mesh boundary is modified for the decomposition structure, and textures such as windows are mapped on the side wall of the structure by mapping the texture on the side wall of the structure reconstructed after reconstructing the single-bodied structure before decomposition, or mapping the texture progressively on the side wall of the decomposition structure with the stored start point and end point of the texture to be mapped.
Claims16
A navigation apparatus, comprising:
- a map data base storing map information comprising structure data defining structures in terms of a decomposed grid comprising grid areas having a predefined size;
- a reader unit which reads map information from the map data base for display in a three-dimensional view;
- graphic analysis units which draw a decomposition structure formed by decomposing a single-bodied structure that exists in at least two grid areas, and a non-decomposition structure which does not exist in more than a single grid area;
- a data processor programmed to
- determine whether structure data contained in map information read from said map data base corresponds to a decomposition structure;
- and
- cause a graphic analysis unit to use plural sets of structure data originated from a single-bodied structure before decomposition among structure data determined to correspond to a decomposition structure, to draw plural decomposition structures corresponding to said structure data as a unified body, so as to reconstruct said single-bodied structure.
A navigation apparatus, comprising:
- a map data base storing map information comprising structure data defining three-dimensional structures within a map area;
- a display unit;
- and
- a data processor which processes data contained in said map data base, and causes said display unit to display a visually readable representation thereof;
- wherein,
- said map data are projected into a perspective map which is viewed from a preset observation point along an observation axis forming a designated angle with ground surface;
- structures in the projected perspective map are drawn as three-dimensional figures;
- and
- structural walls corresponding to the three-dimensional figures and facing the preset observation point in said perspective map are depicted including texture of said structural walls.
A method of displaying navigational map information, comprising:
- reading map data comprising structure data defining three-dimensional structures within a map area, from a data base storing said map data;
- and
- displaying said map data in a visually observable form;
- wherein
- said map data are projected into a perspective map which is viewed from a preset observation point along an observation axis forming a designated angle with ground surface;
- structures in the projected perspective map are drawn as three-dimensional figures;
- and
- structural walls corresponding to the three-dimensional figures and facing the preset observation point in said perspective map are depicted including texture of said structural walls.
A navigation apparatus having at least a means for reading a map information from a map data base storing a map information of a structure in terms of a decomposed mesh having a predefined size and displaying in a three-dimensional view,
- comprising
- a couple of drawing means for drawing a decomposition structure formed by decomposing a single-bodied structure existing over plural mesh areas and a non-decomposition structure which does not exist over plural mesh areas;
- and
- an identifying means for identifying whether structure data contained in said structure information read from said map data base corresponds to said decomposition structure,
- wherein
- said drawing means for drawing a decomposition structure uses plural sets of structure data originated from an identical single-bodied structure before decomposition among structure data which are judged to correspond to said decomposition structure by said identifying means, and draws plural decomposition structures corresponding to said structure data as a unified body so as to reconstruct said single-bodied structure.
A storage medium used for displaying a map by a computer and storing a map data containing a map information formed in terms of a decomposed mesh having a designated size, wherein
- said map data stores
- structure data corresponding to a decomposition structure formed by decomposing an originally single-bodied structure existing over plural mesh areas in terms of each mesh area;
- structure data corresponding to a non-decomposition structure existing on a single mesh area;
- and
- identification data used for identifying whether each of said structure data corresponds to said decomposition structure.
A map display method, in which a map is decomposed into a mesh area having a predefined size, and from a map data base storing information representing a structure existing in an individual mesh area with respect to said individual mesh area, information representing said structure is read, and a perspective map viewed in a predefined angle with respect to a ground surface is displayed with a coordinate transformation, said method comprising:
- a decomposition structure drawing step for drawing a single-bodied structure before decomposition by using an information
- defined when a structure originally formed as a single body existing over plural mesh areas of said map data base is decomposed for individual mesh areas, and
- representing a decomposition structure stored so as to correspond to each of said plural mesh areas;
- a non-decomposition structure drawing step for drawing a non-decomposition structure, which does not exist over plural mesh areas;
- and
- an identifying step for identifying whether said structure information read from said map data base corresponds to said decomposition structure;
- wherein said decomposition structure drawing step
- uses plural sets of structure formation originated from an identical single-bodied structure before decomposition which is judged to correspond to said decomposition structure by said identifying step;
- and
- draws plural decomposition structure corresponding to said plural sets of structure information as a unified body so as to reconstruct said single-bodied structure before decomposition.
Dependencies are inferred from the claim text.