Claims
- 1. A map display apparatus for displaying a map on a moving display device, comprising:a data reading-out portion for reading out map data representing a mesh area comprising a first point corresponding to a positional information inputted from outside, from a map database that stores at least one of a first map data representing a three-dimensional map within said mesh area and a second map data representing a two-dimensional map within said mesh area; a viewpoint setting portion for determining a viewpoint at an objective height with respect to a second point, based on a height of the first point and a height of the second point located a predetermined distance from the first point, when the data reading-out portion reads out a first map data, and for determining a viewpoint at a predetermined height with respect to a third point located a predetermined distance from the first point, when the data reading-out portion reads out a second map data; and a display processing portion for performing a perspective transformation on the map data, which is read out by the data reading-out portion from the viewpoint determined by said viewpoint setting portion, and for displaying graphics data generated by the perspective transformation on the display device; wherein a mode of a mark representing said moving display device is switched in accordance with a result whether the data reading-out portion reads out a first map data or a second map data, the mark being displayed on the display apparatus superposing the graphics data.
- 2. A map display apparatus for displaying a map on a display device, being mounted on a moving object, comprising:a data reading-out portion for reading out map data representing a mesh area including a first point corresponding to a positional information inputted from outside, from a map database that stores map data; a viewpoint setting portion for determining a viewpoint at an objective height with respect to a second point based on a height of the first point and a height of the second point at a location a predetermined distance from the first point, and for determining a viewpoint at a predetermined height with respect to a third point, at a location a predetermined distance from the first point; and a display processing portion for performing a perspective transformation on the map data from the viewpoint and for displaying graphic data generated by the perspective transformation on the display device; wherein a mode of a mark representing said moving object is switched in accordance with a result whether the mark being displayed in the display apparatus in a superposing manner on the graphics data.
- 3. A map display apparatus for displaying a map on a display device, being mounted on a moving object, comprising:a data reading-out portion for reading out map data representing a three-dimensional map within a mesh area including a first point corresponding to a positional information inputted from outside, from a map database that stores said map data including height data and two-dimensional data within said mesh area; a viewpoint setting portion for determining a first viewpoint at an objective height with respect to a second point based on a height of the first point and a height of the second point at a location a predetermined distance form the first point, in a three-dimensional display mode, and for determining a second viewpoint at a predetermined height with respect to a third point, at a location a predetermined distance from the first point, in a pseudo three-dimensional display mode; and a display processing portion for performing a perspective transformation on the map data from the first viewpoint in said three-dimensional display mode and performing a perspective transformation on the two-dimensional data in the map data from the second viewpoint in said pseudo three-dimensional display mode, and for displaying graphic data generated by the perspective transformation on the display device; wherein a mode of a mark representing said moving object is switched in accordance with a result whether display mode is said three-dimensional display mode or said pseudo three-dimensional display mode, the mark being displayed in the display apparatus in a superposing manner on the graphics data.
- 4. A map display apparatus in accordance with claim 1, wherein said mode of said mark is switched to a stereoscopic form in a case where the map data read out by the data reading-out portion is the first map data, and said mode of said mark is switched to a simple form in a case where the map data read out by the data reading-out portion is the second map data.
- 5. A map display apparatus in accordance with claim 3, wherein said mode of said mark is switched to a stereoscopic form in said three-dimensional display mode, and said mode of said mark is switched to a simple form in said pseudo three-dimensional display mode.
- 6. A map display apparatus in accordance with claim 3, further comprising an input device for accepting a request for selecting either one of said three-dimensional display mode and said pseudo three-dimensional display mode.
- 7. A map display apparatus for displaying a map on a display device, being mounted on a moving object, comprising:a data reading-out portion for reading out map data representing a three-dimensional map within a mesh area including a first point corresponding to a positional information inputted from outside, from a map database that stores said map data; a viewpoint setting portion for determining a view point at an objecting height with respect to a second point, based on a height of the first point and a height of the second point at a location a predetermined distance from the first point; an input device for accepting an operation for changing said height of said viewpoint, said viewpoint setting portion changing said height of said viewpoint in response to said operation; a display processing portion for performing a perspective transformation the map data read out by the data reading-out portion from the viewpoint, and for displaying graphics data generated by the perspective transformation on the display device; wherein a mode of a mark representing said moving object is switched in accordance with said height of said viewpoint.
- 8. A map display apparatus in accordance with claim 7, wherein said mode of said mark is switched to either one of a stereoscopic form and a simple form, based on said height of said viewpoint.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-294919 |
Nov 1996 |
JP |
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Parent Case Info
This is a continuation of application Ser. No. 09/640,522 now U.S. Pat. No. 6,341,254 filed Aug. 17, 2000, which is a continuation of application Ser. No. 08/963,607 filed Oct. 31, 1997, which was issued as U.S. Pat. No. 6,175,802 on Jan. 16, 2001.
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Continuations (2)
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Number |
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Parent |
09/640522 |
Aug 2000 |
US |
Child |
10/001669 |
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