US20100235779A1 - Electronic map apparatus and electronic map display method - Google Patents
Electronic map apparatus and electronic map display method Download PDFInfo
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- US20100235779A1 US20100235779A1 US12/787,012 US78701210A US2010235779A1 US 20100235779 A1 US20100235779 A1 US 20100235779A1 US 78701210 A US78701210 A US 78701210A US 2010235779 A1 US2010235779 A1 US 2010235779A1
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- 238000000034 method Methods 0.000 title claims description 11
- 230000008602 contraction Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 239000003086 colorant Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/36—Input/output arrangements for on-board computers
- G01C21/3679—Retrieval, searching and output of POI information, e.g. hotels, restaurants, shops, filling stations, parking facilities
- G01C21/3682—Retrieval, searching and output of POI information, e.g. hotels, restaurants, shops, filling stations, parking facilities output of POI information on a road map
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/34—Route searching; Route guidance
- G01C21/36—Input/output arrangements for on-board computers
- G01C21/3667—Display of a road map
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
- G09B29/10—Map spot or coordinate position indicators; Map reading aids
- G09B29/106—Map spot or coordinate position indicators; Map reading aids using electronic means
Definitions
- the present invention relates to an electronic map apparatus and a method of displaying an electronic map.
- a map is displayed on a display unit in accordance with map data read out from a memory such as a CD-ROM.
- a function to draw lines along longitude and latitude lines, superposing the lines on the map at predetermined intervals to form a shape resembling a checkerboard as shown in FIG. 6A .
- this drawing function for example, it is possible to know an approximate geographical distance between the present position of the vehicle and a destination of the vehicle such as a location or a building.
- electronic map viewer application software executed on a personal computer includes a function for displaying a scale showing a geographical distance outside the frame of a displayed map. By using this distance scale, a geographical distance can also be determined.
- FIG. 6A is a diagram showing a map in a top view.
- an onboard navigation apparatus mounted on a vehicle also includes a function to convert original map data into a map displayed in a perspective view as shown in FIG. 6B .
- the present invention addresses such problems.
- the present invention provides an electronic map apparatus comprising: data fetching means for fetching map data from media for storing the map data to be displayed as a map; a display device for displaying the map in accordance with the map data; and a microcomputer for processing data of a circle or an arc which has a center at a specified point on the map and links points on the map at equal geographical distances from the center, wherein the circle or the arc is displayed on the map displayed on the display device in accordance with the data processed by the microcomputer.
- a circle or an arc representing a geographical distance is drawn on an electronic map.
- FIG. 1 is a block diagram showing an embodiment of the present invention
- FIGS. 2A and 2B are perspective views each showing a display example provided by the present invention.
- FIG. 3 is a perspective view showing a display example provided by the present invention.
- FIG. 4 is a perspective view showing a display example provided by the present invention.
- FIG. 5 is a top view showing a display example provided by the present invention.
- FIGS. 6A and 6B are explanatory diagrams used for describing the present invention.
- An onboard navigation apparatus mounted on a vehicle is normally provided with a function to display the position of the vehicle on an electronic map appearing on a display unit.
- the user is allowed to scroll an electronic map appearing on a display unit by operating components such as a cursor key and a mouse.
- the application software displays a cross-shaped cursor or a finger mark as a scroll center mark at a position in close proximity to the center of the map.
- the present invention allows the user to know a geographical distance on an electronic map speedily and intuitively by focusing on these points.
- the present invention is exemplified by an embodiment as applied to an onboard navigation apparatus mounted on a vehicle by referring to FIG. 1 .
- FIG. 1 is a diagram showing a navigation apparatus employing a microcomputer 10 used as a control circuit for controlling the apparatus.
- the microcomputer 10 comprises a CPU 11 for executing a variety of programs, a ROM 12 for storing these programs, a RAM 13 used as a work area and a non-volatile memory 14 for holding various kinds of data.
- the CPU 11 , the ROM 12 , the RAM 13 and the non-volatile memory 14 are connected to each other by a system bus 19 .
- system bus 19 is also connected to a variety of operation keys 15 through a key interface circuit 16 and connected to a color LCD 18 serving as a display device through an LCD controller circuit 17 .
- the navigation apparatus shown in FIG. 1 employs a DVD-ROM 30 as media with a large capacity for storing various kinds of map data required for navigation.
- the map data includes data used as a base for displaying a map and data of roads for map matching.
- the navigation apparatus thus includes a DVD-ROM drive 21 for reading out data from the DVD-ROM 30 .
- the DVD-ROM drive 21 is also connected to the system bus 19 .
- the navigation apparatus also includes a gyro 22 serving as a self-contained navigation unit.
- the gyro 22 generates data such as its own movement speed, supplying the data to the microcomputer 10 .
- the navigation apparatus has a vehicle-speed sensor 23 for detecting the running speed of the vehicle. A detection signal generated by the vehicle-speed sensor 23 is also supplied to the microcomputer 10 .
- a wave transmitted by a navigation satellite such as a GPS satellite is received by a GPS antenna 24 and a signal generated by the GPS antenna 24 to represent the received wave is supplied to a GPS unit (reception circuit) 25 .
- the GPS unit 25 generates data such as the position of the vehicle, supplying the data to the microcomputer 10 .
- FIG. 2A is a diagram showing the electronic map 40 in a perspective view.
- concentric distance display circles 42 , 43 and 44 centered at the vehicle mark 41 or with a center located at the position of the vehicle are displayed on the electronic map 40 as shown in FIG. 2B .
- the concentric distance display circles 42 to 44 which are centered at the vehicle mark 41 are each an equidistant curve interconnecting points on the electronic map 40 at equal geographical distances to the vehicle mark 41 .
- the distance display circles 42 to 44 each appear approximately as an ellipse.
- the distance display circles 42 to 44 shown in FIG. 2B are equidistant curves interconnecting points at distances of 200 m, 400 m and 800 m respectively which form a geometrical series.
- the distance display circles 42 to 44 are each marked with a number 45 indicating the geographical distance from the vehicle mark 41 at a location in close proximity to the curve.
- the geographical distances for the distance display circles 42 to 44 and the marking numbers 45 are set at values such as 50 m, 100 m, 200 m and 400 m which correspond to the degree of contraction of the displayed electronic map 40 .
- the distance display circles 42 to 44 are displayed by execution of a program to draw the circles 42 to 44 by the CPU 11 .
- the program is stored in the ROM 12 in advance. In the case of the distance display circle 44 , only an arc thereof or a partial equidistant curve of the circle 44 is displayed on the electronic map 40 shown in FIG. 2B .
- the navigation apparatus displays the electronic map 40 on the LCD 18 and the distance display circles 42 to 44 which have a center at the vehicle mark 41 and connect points at equal geographical distances from the center.
- a destination such as a location or a building
- the navigation apparatus displays the electronic map 40 on the LCD 18 and the distance display circles 42 to 44 which have a center at the vehicle mark 41 and connect points at equal geographical distances from the center.
- the geographical distance can be known without a problem even if the electronic map 40 is displayed in a perspective view and, moreover, even if the destination is located in a slanting direction.
- the map 40 can be used as a reference of a drive plan with ease. Additionally, since the electronic map 40 is displayed in a perspective view, the distance display circles 42 to 44 provide an improved three-dimensional effect. Moreover, by merely adding a program for displaying the distance display circles 42 to 44 to a drawing driver (or a drawing software program), the effect described above can be obtained.
- FIG. 3 is a diagram showing a cross-shaped cursor 46 indicating a scroll center at a location in close proximity to the center of the electronic map 40 which is displayed in a perspective view.
- the figure also shows the distance display circles 42 , 43 and 44 which have a common center at the cross-shaped cursor 46 and connect points at equal geographical distances of 200 m, 400 m and 800 m respectively from the center.
- FIG. 4 is a diagram which shows the electronic map 40 in a perspective view after shifting the electronic map 40 in the direction of the vehicle movement so that the vehicle mark 41 is located below the center of the electronic map 40 in order to display more information on locations on the electronic map 40 in the direction of the vehicle movement.
- the whole circumferences or partial arcs of the distance display circles 42 to 44 and distance display circles on the outer side of the circles 42 to 44 can each be displayed as an equidistant curve.
- FIG. 5 is a diagram showing the electronic map 40 in a top view. In this form, the distance display circles 42 to 44 are each displayed almost as a true circle.
- the circles 42 to 44 can be made more clearly visible.
- the electronic map 40 can also be displayed as areas having different colors with the circles 42 to 44 each serving as a border between two adjacent colors. Assuming that the display processing hardware comprises two or more layers, the electronic map 40 is drawn at the lower layer whereas the upper layer is made a semi-transparent layer, and colors are provided with the circles 42 to 44 each serving as a border between two adjacent colors.
- the present invention is exemplified by an onboard navigation apparatus mounted on a vehicle in the above description, the invention can also be applied to a case in which a map is displayed in accordance with map data on a FDA or a personal computer. Furthermore, media with a large storage capacity such as a CD-ROM can also be employed in place of the DVD-ROM 30 . Moreover, the format of map data used as a base for displaying the electronic map 40 on the display apparatus does not matter.
Abstract
In an electronic map apparatus, an electronic map is displayed in accordance with map data read out from a DVD-ROM. Then, distance display circles which have a common center located at a point on the electronic map and each interconnect points on the electronic map at equal geographical distances from the point are drawn.
As a result, it is possible to know an approximate geographical distance to a destination intuitively and easily in the electronic map apparatus which is typically used for car navigation.
Description
- The present invention relates to an electronic map apparatus and a method of displaying an electronic map.
- In an onboard navigation apparatus mounted on a vehicle, a map is displayed on a display unit in accordance with map data read out from a memory such as a CD-ROM. Typically, there is provided a function to draw lines along longitude and latitude lines, superposing the lines on the map at predetermined intervals to form a shape resembling a checkerboard as shown in
FIG. 6A . - Thus, by using this drawing function, for example, it is possible to know an approximate geographical distance between the present position of the vehicle and a destination of the vehicle such as a location or a building.
- In addition, electronic map viewer application software executed on a personal computer, for example, includes a function for displaying a scale showing a geographical distance outside the frame of a displayed map. By using this distance scale, a geographical distance can also be determined.
- In the case of such a display method, however, in an attempt to know the approximate geographical distance between the present position of the vehicle and the destination of the vehicle such as a location or a building while driving the vehicle, it is difficult to know the geographical distance instantaneously. Particularly, it is more difficult to know a geographical distance in a direction slanting with respect to a longitude or latitude line.
-
FIG. 6A is a diagram showing a map in a top view. In general, however, an onboard navigation apparatus mounted on a vehicle also includes a function to convert original map data into a map displayed in a perspective view as shown inFIG. 6B . - On a map displayed in a perspective view, a unit-length distance varies from position to position as well as from direction to direction. It is thus much more difficult to intuitively and speedily know an actual geographical distance.
- The present invention addresses such problems.
- In order to solve the problems described above, the present invention provides an electronic map apparatus comprising: data fetching means for fetching map data from media for storing the map data to be displayed as a map; a display device for displaying the map in accordance with the map data; and a microcomputer for processing data of a circle or an arc which has a center at a specified point on the map and links points on the map at equal geographical distances from the center, wherein the circle or the arc is displayed on the map displayed on the display device in accordance with the data processed by the microcomputer.
- Thus, a circle or an arc representing a geographical distance is drawn on an electronic map.
-
FIG. 1 is a block diagram showing an embodiment of the present invention; -
FIGS. 2A and 2B are perspective views each showing a display example provided by the present invention; -
FIG. 3 is a perspective view showing a display example provided by the present invention; -
FIG. 4 is a perspective view showing a display example provided by the present invention; -
FIG. 5 is a top view showing a display example provided by the present invention; and -
FIGS. 6A and 6B are explanatory diagrams used for describing the present invention. - An onboard navigation apparatus mounted on a vehicle is normally provided with a function to display the position of the vehicle on an electronic map appearing on a display unit.
- In addition, with an onboard navigation apparatus mounted on a vehicle or electronic map viewer application software, the user is allowed to scroll an electronic map appearing on a display unit by operating components such as a cursor key and a mouse. In order to clearly indicate a location serving as an object of operation after the scroll processing, normally, the application software displays a cross-shaped cursor or a finger mark as a scroll center mark at a position in close proximity to the center of the map.
- The present invention allows the user to know a geographical distance on an electronic map speedily and intuitively by focusing on these points.
- In the following description, the present invention is exemplified by an embodiment as applied to an onboard navigation apparatus mounted on a vehicle by referring to
FIG. 1 . -
FIG. 1 is a diagram showing a navigation apparatus employing amicrocomputer 10 used as a control circuit for controlling the apparatus. As shown in the figure, themicrocomputer 10 comprises aCPU 11 for executing a variety of programs, a ROM 12 for storing these programs, aRAM 13 used as a work area and anon-volatile memory 14 for holding various kinds of data. TheCPU 11, the ROM 12, theRAM 13 and thenon-volatile memory 14 are connected to each other by asystem bus 19. - In addition, the
system bus 19 is also connected to a variety ofoperation keys 15 through akey interface circuit 16 and connected to acolor LCD 18 serving as a display device through anLCD controller circuit 17. - The navigation apparatus shown in
FIG. 1 employs a DVD-ROM 30 as media with a large capacity for storing various kinds of map data required for navigation. The map data includes data used as a base for displaying a map and data of roads for map matching. The navigation apparatus thus includes a DVD-ROM drive 21 for reading out data from the DVD-ROM 30. The DVD-ROM drive 21 is also connected to thesystem bus 19. - The navigation apparatus also includes a
gyro 22 serving as a self-contained navigation unit. Thegyro 22 generates data such as its own movement speed, supplying the data to themicrocomputer 10. In addition, the navigation apparatus has a vehicle-speed sensor 23 for detecting the running speed of the vehicle. A detection signal generated by the vehicle-speed sensor 23 is also supplied to themicrocomputer 10. - Furthermore, a wave transmitted by a navigation satellite such as a GPS satellite is received by a
GPS antenna 24 and a signal generated by theGPS antenna 24 to represent the received wave is supplied to a GPS unit (reception circuit) 25. TheGPS unit 25 generates data such as the position of the vehicle, supplying the data to themicrocomputer 10. - In such a configuration, the signals output by the
gyro 22, the vehicle-speed sensor 23 and theGPS unit 25 are processed by theCPU 11 to determine the position of the vehicle. Then, data of a map including the position of the vehicle is read out from the DVD-ROM 30. Subsequently, anelectronic map 40 centered at the vicinity of the vehicle position is displayed on theLCD 18 typically as shown inFIG. 2A . In addition, amark 41 typically resembling an inverted V-character for representing the vehicle is displayed at the position of the vehicle. It should be noted thatFIG. 2A is a diagram showing theelectronic map 40 in a perspective view. - Then, when a predetermined key among the
keys 15 is operated, concentricdistance display circles vehicle mark 41 or with a center located at the position of the vehicle are displayed on theelectronic map 40 as shown inFIG. 2B . The concentricdistance display circles 42 to 44 which are centered at thevehicle mark 41 are each an equidistant curve interconnecting points on theelectronic map 40 at equal geographical distances to thevehicle mark 41. In the case of the example shown inFIG. 2B , since theelectronic map 40 is displayed in a perspective view, thedistance display circles 42 to 44 each appear approximately as an ellipse. - The
distance display circles 42 to 44 shown inFIG. 2B are equidistant curves interconnecting points at distances of 200 m, 400 m and 800 m respectively which form a geometrical series. Thedistance display circles 42 to 44 are each marked with anumber 45 indicating the geographical distance from thevehicle mark 41 at a location in close proximity to the curve. - It should be noted that the geographical distances for the
distance display circles 42 to 44 and themarking numbers 45 are set at values such as 50 m, 100 m, 200 m and 400 m which correspond to the degree of contraction of the displayedelectronic map 40. The distance display circles 42 to 44 are displayed by execution of a program to draw thecircles 42 to 44 by theCPU 11. The program is stored in the ROM 12 in advance. In the case of thedistance display circle 44, only an arc thereof or a partial equidistant curve of thecircle 44 is displayed on theelectronic map 40 shown inFIG. 2B . - As described above, the navigation apparatus displays the
electronic map 40 on theLCD 18 and the distance display circles 42 to 44 which have a center at thevehicle mark 41 and connect points at equal geographical distances from the center. Thus, an approximate geographical distance to a destination such as a location or a building can be intuitively and speedily known. - In addition, in this case, the geographical distance can be known without a problem even if the
electronic map 40 is displayed in a perspective view and, moreover, even if the destination is located in a slanting direction. - Furthermore, since an approximate geographical distance from the position of the vehicle to a destination can be known intuitively and speedily from the
electronic map 40, themap 40 can be used as a reference of a drive plan with ease. Additionally, since theelectronic map 40 is displayed in a perspective view, the distance display circles 42 to 44 provide an improved three-dimensional effect. Moreover, by merely adding a program for displaying the distance display circles 42 to 44 to a drawing driver (or a drawing software program), the effect described above can be obtained. -
FIG. 3 is a diagram showing across-shaped cursor 46 indicating a scroll center at a location in close proximity to the center of theelectronic map 40 which is displayed in a perspective view. The figure also shows the distance display circles 42, 43 and 44 which have a common center at thecross-shaped cursor 46 and connect points at equal geographical distances of 200 m, 400 m and 800 m respectively from the center. -
FIG. 4 is a diagram which shows theelectronic map 40 in a perspective view after shifting theelectronic map 40 in the direction of the vehicle movement so that thevehicle mark 41 is located below the center of theelectronic map 40 in order to display more information on locations on theelectronic map 40 in the direction of the vehicle movement. In such a case, the whole circumferences or partial arcs of the distance display circles 42 to 44 and distance display circles on the outer side of thecircles 42 to 44 can each be displayed as an equidistant curve. -
FIG. 5 is a diagram showing theelectronic map 40 in a top view. In this form, the distance display circles 42 to 44 are each displayed almost as a true circle. - Also in the case of these
electronic maps 40, a geographical distance can be known intuitively and speedily from the distance display circles 42 to 44. - It should be noted that, by displaying the distance display circles 42 to 44 each as a shadowed figure or as a highlighted figure, or by providing a ground color such as a supplementary color of a drawn portion to the distance display circles 42 to 44, the
circles 42 to 44 can be made more clearly visible. - In addition, by displaying a character or a symbol to represent a direction on the circumference of a circle with the center thereof located at the
vehicle mark 41 on theelectronic map 40 appearing in a perspective view, is possible to easily and instantly know the running direction, of the vehicle, which is difficult to recognize in a perspective view. - Furthermore, it is also possible to display lines radiately from the position of the vehicle or the center of the
electronic map 40 and display a scale representing the geographical distance from the position of the vehicle or the center of theelectronic map 40 on each of the lines. - Moreover, in place of the distance display circles 42 to 44, the
electronic map 40 can also be displayed as areas having different colors with thecircles 42 to 44 each serving as a border between two adjacent colors. Assuming that the display processing hardware comprises two or more layers, theelectronic map 40 is drawn at the lower layer whereas the upper layer is made a semi-transparent layer, and colors are provided with thecircles 42 to 44 each serving as a border between two adjacent colors. - Additionally, while the present invention is exemplified by an onboard navigation apparatus mounted on a vehicle in the above description, the invention can also be applied to a case in which a map is displayed in accordance with map data on a FDA or a personal computer. Furthermore, media with a large storage capacity such as a CD-ROM can also be employed in place of the DVD-
ROM 30. Moreover, the format of map data used as a base for displaying theelectronic map 40 on the display apparatus does not matter.
Claims (15)
1. An electronic map apparatus comprising:
data fetching means for fetching map data from media for storing said map data to be displayed as a map;
a display device for displaying said map in accordance with said map data; and
a microcomputer for processing, to display said map in a perspective view, data of a circle or an arc which has a center at a specified point on said map and links points on said map at equal geographical distances from said center.
2. An electronic map apparatus comprising:
data fetching means for fetching map data from media for storing said map data to be displayed as a map;
a display device for displaying said map in accordance with said map data; and
a microcomputer for processing data of a circle or an arc which has a center at a specified point on said map and links points on said map at equal geographical distances from said center,
wherein said circle or said arc is displayed on said map displayed on said display device in a perspective view in accordance with said data processed by said microcomputer when said map is displayed on said display device.
3. An electronic map apparatus according to claim 2 , wherein said microcomputer processes data of a plurality of said circles or said arcs representing different geographical distances from said center and said circles or said arcs are each superposed on said map displayed in a perspective view.
4. An electronic map apparatus according to claim 3 , wherein said microcomputer outputs numbers each indicating a geographical distance from said center to one of said circles or said arcs and displays each of said numbers at a location in close proximity to the circumference of said circle or said arc with a geographical distance thereof indicated by said number.
5. An electronic map apparatus according to claim 3 , wherein said microcomputer changes contraction of a map displayed on said display device in a perspective view and modifies said geographical distances from said center to said circles or said arcs and the number of said circles or said arcs in accordance with a degree of contraction of said map.
6. An electronic map apparatus according to claim 2 , wherein: said electronic map apparatus is a navigation apparatus mounted on a vehicle; said specified point is the position of said vehicle; map data of a map including said position of said vehicle is read out from said media; and said map is displayed in a perspective view in accordance with said map data read out from said media.
7. An electronic map apparatus according to claim 2 , wherein said specified point is a point on a map specified by a user.
8. An electronic map apparatus according to claim 1 , wherein said map is displayed in a perspective view, and a character or a symbol representing a direction is displayed at said specified point.
9. An electronic map display method comprising the steps of:
fetching map data from predetermined media for storing said map data to be displayed as a map;
displaying said map on a display device in a perspective view in accordance with said map data; and
displaying a circle or an arc, which has a center at a specified point on said map and links points on said map at equal geographical distances from said center, on said map displayed on a display device in a perspective view.
10. An electronic map display method according to claim 9 , wherein a plurality of said circles or said arcs representing different geographical distances from said center each displayed on said map displayed in a perspective view.
11. An electronic map display method according to claim 10 , wherein numbers each indicating a geographical distance from said center to one of said circles or said arcs are displayed at a location in close proximity to the circumference of said circle or said arc.
12. An electronic map display method according to claim 10 , wherein said geographical distances from said center to said circles or said arcs and the number of said circles or said arcs are changed in accordance with a degree of contraction of said map.
13. An electronic map display method according to claim 9 , wherein: the position of a vehicle on which a navigation apparatus is mounted is specified as said specified point; map data of a map including said position of said vehicle is read out from said media; and said map is displayed in a perspective view in accordance with said map data read out from said media.
14. An electronic map display method according to claim 9 , wherein a point on a map is specified by a user as said specified point.
15. An electronic map display method according to claim 9 , wherein said map is displayed in a perspective view, and a character or a symbol representing a direction is displayed at said specified point.
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US09/553,530 US7743337B1 (en) | 1999-04-21 | 2000-04-20 | Electronic map apparatus and electronic map display method |
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Also Published As
Publication number | Publication date |
---|---|
JP2000305452A (en) | 2000-11-02 |
EP1046882A3 (en) | 2002-09-18 |
CN1271087A (en) | 2000-10-25 |
CN101029832A (en) | 2007-09-05 |
EP1046882A2 (en) | 2000-10-25 |
US7743337B1 (en) | 2010-06-22 |
CN101029832B (en) | 2012-09-19 |
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