JP2001034160A - Map display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user to recognize displays for discriminating facilities surely when buildings or the like are displayed three-dimentionally. SOLUTION: In a state in which buildings are displayed three-dimentionally, when, for example, a convenience store moves into buildings as a shop, a facilitiy mark display part 15 is plotted at the rooftop of a building where the shop has moved into. Since this facility mark display part 15 is constituted by plotting convenience store mark [C] on cube shaped outer surface, the part 15 can be displayed as if a signboard of cube is installed on the rooftop of building 14. Consequently, the user can recognize that convenience store moved into the building 14 by the facility mark display part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map display device for three-dimensionally displaying buildings and the like on a screen.

[0002]

2. Description of the Related Art For example, in a car navigation system, a facility such as a convenience store located in the vicinity of a vehicle currently traveling is displayed by drawing a facility mark on a two-dimensional map so that the user can view the current location and the facility location. It has been done to make it easier to figure out. In addition, by drawing a map three-dimensionally, the actual scene and the display form of the screen are brought closer to each other, so that the current position and the facility position can be grasped more accurately.

[0003]

However, in a car navigation system having a three-dimensional display function as a display image, for example, when a three-dimensional display is selected and a facility is present in a building, a facility mark is used. Even if it is displayed at the position, the facility mark is hidden in the three-dimensional display of the building, and the facility mark cannot be recognized. When the facility is located behind the building, the facility mark is hidden behind the building and cannot be recognized. For this reason, depending on the relationship between the facility and the building, the user may not be able to recognize the facility, and there is a drawback that the usability is poor.

The present invention has been made in view of the above circumstances, and has as its object to provide a map display device capable of reliably recognizing a display for identifying a facility when a building or the like is three-dimensionally displayed. Is to do.

[0005]

According to the first aspect of the present invention, the display control means, when displaying the map screen three-dimensionally,
When the facility identification display for identifying the facility is hidden in the building, the facility identification display is displayed in a visible form, so that the user can recognize the facility position without being obstructed by the building. .

According to the second aspect of the invention, when the facility identification display section is hidden by the building because the facility is occupied in the building, the display control means associates the facility identification display section with the building. It is displayed at a position where it can be visually recognized in the form. Thereby, the user can recognize the facility position by the facility identification display unit without being disturbed by the building.

According to the third aspect of the present invention, when the viewpoint of the screen display is changed, the display control means displays the facility identification display section in a visible form regardless of the change of the viewpoint of the screen display. Thus, the user can reliably recognize the facility position regardless of the viewpoint of the screen display.

According to the fourth aspect of the present invention, the display control means displays the facility identification display section three-dimensionally.
Even if the viewpoint of the screen display is changed, the facility position can be reliably recognized.

According to the fifth aspect of the present invention, the display control means displays the facility identification display section at the rooftop of the building.
The user can reliably associate the facility identification display with the building.

According to the sixth aspect of the present invention, the display control means displays the facility identification display section in a form supported by the columns, so that even if the building is located in front of the facility, the user can use the display. Can reliably recognize the facility position.

According to the seventh aspect of the invention, when the facility identification display section overlaps with another facility identification display section, the display control means shifts the facility identification display section to a visible position and displays it. The user can recognize a plurality of facility locations at the same time.

According to the eighth aspect of the invention, when the facility identification display section is shifted and displayed, the facility identification display section is displayed on the wall surface of the building, so that the building identification display section can be reliably associated with the building.

According to the eleventh aspect of the invention, the display control means selects the dot map image data stored in the storage means according to the distance from the screen display viewpoint to the facility identification display section. At this time, the storage means stores the display data of the facility identification display section as a plurality of bitmap image data having the same bit size and different overall sizes, so that the distance from the screen display to the facility identification display section is different. Even in this case, the display roughness of the facility identification display section becomes equal, and the user can surely recognize the facility identification display section.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the present invention is applied to a car navigation system will be described below with reference to FIGS. FIG. 2 schematically shows the entire configuration. In FIG. 2, a position detection unit 1 is configured by a GPS (Global Positioning System) sensor, a gyro sensor, a vehicle speed sensor, and the like, and is a part that calculates a current position. The position detection unit 1 is configured to use each sensor while interpolating since each sensor has an error having a different property. However, if the current position can be calculated, it is not necessary to provide all the sensors. , Or at least one of them.

Map data storage (corresponding to storage means) 2
Is a device for inputting various data including so-called map matching data, map data, and target data for improving the accuracy of position detection, and includes a DVD player, a hard disk device, a CD player, and the like.

The switch information input unit 3 includes switches mounted on the left and right and up and down of the display device. The memory unit (ROM, RAM) 4 is a unit for temporarily storing a navigation program, a work memory of the program, map data acquired from the map data storage unit 2, and the like.

The display unit 5 displays a map, a destination selection screen, and the like as navigation. The screen includes a current position mark of the vehicle input from the position detection unit 1 and an input from the map data storage unit 2. The displayed map data and additional data such as a guide route and a mark of a set point to be displayed on the map are displayed in a superimposed manner. The voice output unit 6 utters voice for guidance and explanation of screen operation.

A control unit (corresponding to a display control unit) 7 automatically selects an optimal route from a current position to a destination in accordance with an operation on the switch information input unit 3 to form a guidance route and display it. It performs a route guidance function, performs map matching processing, calculates guidance voice, draws a map, and the like. The Dijkstra method is known as a method for automatically setting an optimum route in this way. The control unit 7 includes a map data acquisition unit 8, a map matching unit 9,
It comprises a route calculation unit 10, a route guidance unit 11, a drawing unit 12, and a screen control management unit 13.

The map matching unit 9 uses the position information detected by the position detection unit 1 and the road shape data of the map data acquired from the map data storage unit 2 to determine on which road the current position is located. Identify. At this time, the map data acquisition unit 8 acquires necessary map data from the map data storage unit 2. In addition, the user performs an operation of displaying a desired map using the switch information input unit 3, and sets a destination. In the route calculation unit 10, the map matching unit 9
The information of the current position calculated in the above, and the departure point specified by the user and the route to the destination are calculated.

The route guidance unit 11 calculates the result of the route calculation and the road shape data stored in the map data,
A point necessary for guidance is calculated from the position information of the intersection, the position information of the railroad crossing, and the like, and what kind of guidance (turn right or turn left) is calculated.

The drawing unit 12 draws a map of the current position, a schematic diagram of an expressway, an enlarged view near an intersection near an intersection, and the like in accordance with an instruction of the screen control management unit 13, and displays the drawing on the display unit 5. The map data acquisition unit 8 acquires map data required by each of the processing units from the map data storage unit 2 and provides the map data to each processing unit. Further, the above-described processing is performed by the R
It is executed using OM or RAM.

The map drawn by the drawing unit 12 is a three-dimensional map, and the building is three-dimensionally represented by the building shape data and height information stored in the map data. Based on the information calculated by the route guidance unit 11, when the vehicle advances and comes to a position to be guided, a desired image is drawn on the drawing unit 12,
A predetermined sound is generated by the sound output unit 6 to guide the user to the destination.

Next, the operation of the above configuration will be described. FIG. 3 shows only the operation of the characteristic portion related to the present invention among the operations of the control section 7. In FIG. 3, the control unit 7
Monitors whether a facility has been selected (S101).

FIG. 4 shows an example in which a map screen is three-dimensionally displayed on the display unit 5. FIG. 4 shows a map screen when the vehicle stops. When the user wants to search for an arbitrary type of facility on the map screen shown in FIG. 4, the user operates the switch information input unit 3 to specify an arbitrary type of facility.

Then, when the facility to be displayed is selected (S101: YES in FIG. 3), the control unit 7 stores the coordinates, type, name, and I of the building data from the map data storage unit 2.
D and the like are acquired (S102). In this case, the facilities can be selected from convenience stores, gas stations, fast food, family restaurants, restaurants, dealers, hospitals, banks, supermarkets, department stores, parking lots, car supply stores, hotels, and the like.

By the way, in a building densely populated area, it is general that any of the above facilities is occupied as a store in the building. The building and the building are drawn at substantially the same position. However, in this case, there is a problem that the facility mark is buried in the building and the facility mark cannot be displayed.

Then, the control section 7 collects the facilities selected by the switch information input section 3 (S103), acquires the height information of the corresponding building (S104), and moves the facility to the position raised by the height. The facility mark is displayed three-dimensionally (S10)
5). As a result, the facility mark is displayed as if it were a signboard installed on the roof of the building, so that the building and the facility mark are compared with a case where the facility mark is displayed at a position off the building or in front of the building. And the building in which the facility is located can be reliably recognized.

In this case, when the facility mark is displayed three-dimensionally, for example, as a flat signboard, the viewpoint of the screen display (hereinafter, virtual viewpoint) is changed and the facility mark is viewed from the side. In such a case, the facility mark cannot be recognized. Based on this, instead of displaying the facility mark in a flat shape, the facility mark is drawn on a cubic outer surface (all six surfaces in the present embodiment) (hereinafter, the facility mark is drawn on the wall surface). The cube is referred to as a facility mark display.) And the control unit 7
Displays all the facility mark display sections selected as described above on the roof of the corresponding facility.

More specifically, when displaying, for example, a convenience store mark as the facility mark display unit, the map data storage unit 2 stores the two-dimensional data corresponding to the convenience store as shown in FIG. The basic bitmap image data is read, three-dimensional coordinate conversion is performed corresponding to the facility mark polygon, and calculation is performed so that the length of one side of the three-dimensional coordinate converted bitmap image matches the length of one side of the facility mark polygon. After that, it is attached to each surface of the facility mark polygon. In this case, when the surface size of the facility mark polygon is larger than the size of the bitmap image subjected to the three-dimensional coordinate conversion, the bitmap image is enlarged and pasted, and the size of one dot is increased.

When the convenience store is selected as the facility by the above operation, as shown in FIG. 1, the building 1 in which the convenience store is located as a store is located.
On the rooftop of 4 is a convenience store mark "C"
Is drawn on the facility mark display section 15 in which
Since it can be displayed as if a cubic signboard is installed on the roof of the building 14, the user can display the building 14 based on the display of the convenience store mark "C".
Can recognize that the convenience store is occupied as a store.

In this case, the facility mark display section 15 is displayed larger as the distance from the virtual viewpoint becomes shorter, so that the approximate distance to the facility can be intuitively grasped by the size of the facility mark display section 15. can do.

The wall (6) of the facility mark display section 15
Side), convenience store facility mark "C"
Is drawn, even if the virtual viewpoint is changed by moving the screen, any one of the wall surfaces of the facility mark display unit 15 can be visually recognized, so that the user can access the convenience store mark as shown in FIG. “C” can be recognized from any viewpoint direction (the left and right sides of the screen, the back side, etc. in FIG. 1).

On the other hand, when the convenience store is a one-story store, there is no building data corresponding to the facility or no height data in the building. Further, when one of the facility data and the building data is changed by version upgrade or the like, the correspondence between the facility data and the building data may not be maintained.

Therefore, in such a case, the facility mark display section 15 is lifted up by a certain height for drawing. In this case, as shown in FIG. 7, the facility mark display section 15 is lifted up by the support 16 and drawn. Therefore, the user can specify the position of the facility based on the position of the support 16 that supports the facility mark display unit 15.

According to the present embodiment, the building 1
When the facility is occupied as a store in 4, the facility mark display section 15 showing the facility mark is displayed on the roof of the building 14 as if it were a three-dimensional signboard. 14, and the building 14 in which the facility is located can be specified based on the position of the facility mark. Further, even if the viewpoint of the three-dimensional map display is variously changed, the existence of the facility can be surely grasped.

Further, when there is no building data corresponding to the facility, the facility mark display section 15 is displayed in a form supported by the columns 16, so that the user can surely recognize the location of the facility. it can.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
Will be described with reference to FIGS. 8 and 9. FIG. The second embodiment is characterized in that when the facility mark display section 15 is displayed in an overlapping manner, the facility mark display section 15 is shifted and displayed.

FIG. 8 schematically shows a characteristic part of the operation of the control unit 7, and the same steps as those in the first embodiment are denoted by the same step numbers, and the description is omitted. In FIG. 8, after collecting the facility mark data selected by the user (S103), the control section 7 sorts the facility mark display section by the distance from the front by converting it into drawing coordinates (S201). ), The overlap of the facility mark display sections is determined (S202). At this time, when the overlap occurs (S202: overlap), the shift processing is performed on the facility mark display unit (S203), and the drawing processing is executed (S204).

FIG. 9 shows an example of a three-dimensional display of the map screen on which the shifting process has been performed as described above. In FIG. 9, for example, if the facility mark display unit 15 is drawn on the roof of the building 14 in a case where the buildings in which the convenience store is occupied are adjacent at approximately the same height, depending on the position of the virtual viewpoint, Although the facility mark display sections 15 overlap each other, as a result of the above-described shifting processing, the control section 7 sets the facility mark as the building 1 instead of the facility mark display section 15 located on the near side as shown in FIG.
4 is drawn on the wall. In this case, building 1 located in front
A facility mark is displayed on all of the walls of No. 4.

Therefore, the user can use the building 1 located in the back.
While recognizing the facility mark display section 15 displayed on the rooftop of No. 4, the facility mark displayed on the wall of the building 14 located in front confirms that the convenience stores are occupying two adjacent buildings respectively. can do. When the overlap of the displays on the facility mark display unit 15 is eliminated by moving the viewpoint of the display screen, the display state returns to the display state shown in FIG.

According to such an embodiment, when the facility mark display section 15 is overlapped when being drawn, the facility mark is drawn on the wall surface of the building 14 located in front of the user. Can reliably recognize the facility position.

In this case, since the facility mark is drawn on all the walls of the building 14 in front, even if the position of the virtual viewpoint is changed, the facility mark is displayed on any of the walls of the building 14 in front. It is possible to confirm the facility mark that is present, and to reliably recognize the facility position.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment is characterized in that, when the facility mark display sections are displayed in an overlapping manner, the facility mark display sections are displayed shifted from each other.

FIG. 10 shows an example of the map screen when the shift processing is performed by the control unit 7. In FIG. 10, the control unit 7 shifts the display positions of the facility mark display units 15 in directions opposite to each other when the facility mark display units 15 drawn on the roof of the adjacent building 14 overlap each other. In addition, overlapping display of the facility mark display section 15 is prevented.

According to the third embodiment, the positions of the facility mark display sections 15 are shifted in opposite directions when they overlap each other when the facility mark display sections 15 are drawn. In addition, overlapping display of the facility mark display unit 15 can be effectively prevented by simple display control.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG. The fourth embodiment is characterized in that, when a facility mark display section is displayed in a superimposed manner, a facility mark display section located at the back is displayed at a position off the roof.

FIG. 11 shows an example of a map screen when the shift processing is performed by the control unit 7. In FIG. 11, when the facility mark display unit 15 drawn on the roof of the adjacent building 14 overlaps, the control unit 7
The facility mark display unit 15 located on the back is displayed on the wall surface of the building 14.

Accordingly, since a three-dimensional signboard is displayed on the wall surface of the building 14 at the back, the user can reliably recognize the facility mark display unit 15 located at the back. it can.

According to the fourth embodiment, when the facility mark display sections 15 overlap each other when they are drawn, the facility mark display section 15 located at the back is shifted and displayed on the wall surface of the building 14. As a result, overlapping display of the facility mark display section 15 can be effectively prevented.

In this case, the facility mark display section 15 located on the back is displayed shifted from the wall surface of the building 14 so that the facility mark display section 15 located on the front side is displayed on the building 14.
It is possible to prevent the display of the building 14 in the back from being hidden by the facility mark display unit 15 as compared with the case where the display is shifted to the wall surface.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG. The fifth embodiment is characterized in that, when the facility mark display section 15 is displayed in an overlapping manner, the facility mark display section 15 is displayed corresponding to the location of the facility.

FIG. 12 shows an example of a map screen when the shifting process is performed by the display unit 5. In FIG. 12, when the facility mark display unit 15 drawn on the roof of the adjacent building 14 overlaps, the control unit 7
The facility mark display section 15 is drawn corresponding to the floor where the convenience store is located in the building 14 in front, and the facility mark display section 15 is highlighted.

According to the fifth embodiment, in the case where the facility mark display sections 15 overlap each other when drawing, the facility mark display section 15 on the front side is displayed on the floor where the facility is located in the building 14. , And the facility mark display section 15 is highlighted.
The facility position in the building 14 can be specified more accurately while avoiding overlapping display of the facility mark display section 15. In this case, the facility mark display unit 15 can be recognized without being disturbed by the building, as compared with a configuration in which the facility mark display unit 15 is highlighted on the building in the back.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIGS. In the sixth embodiment, an appropriate one of a plurality of bitmap image data of different overall sizes stored in advance in the ROM of the memory unit 4 in accordance with the distance from the virtual viewpoint to the facility mark display unit 15 is used. It is characterized in that bitmap image data of a suitable size is selected.

That is, in the first embodiment, the smaller the distance from the virtual viewpoint to the facility mark display unit is, the larger the size of the facility mark display unit 15 is. Therefore, as shown in FIG. Becomes larger, and the display of the facility mark becomes coarse, making it difficult to see.

Therefore, in the present embodiment, the display of the facility mark is prevented from being coarse as follows. FIG. 14 schematically shows a characteristic portion of the operation of the control unit 7, and the same steps as those in the first embodiment and the second embodiment are denoted by the same step numbers and description thereof is omitted. . In FIG. 14, after collecting the facility mark data selected by the user (S103), the control unit 7 obtains the distance from the virtual viewpoint to the facility mark display unit 15 by converting the data into drawing coordinates (S30).
1) Facility mark data having a size corresponding to the distance is selected (S302), and a drawing process is executed (S204).

FIG. 15 is a flowchart showing step S in FIG.
The operations of 301, S302, and S204 are specifically shown. In FIG. 15, the drawing unit 12 first calculates the distance from the virtual viewpoint to the facility mark display unit 15 (S4).
01). That is, the distance L from the virtual viewpoint to the facility mark display unit 15 is calculated as shown in FIG.

Subsequently, the drawing unit 12 determines the size of the bitmap image to be displayed based on the distance L (S402), and then uses the determined bitmap image size and facility type as the map data acquisition unit. 8 (S403).

The map data acquisition unit 8 searches the map data storage unit 2 for bitmap image data based on the bitmap image size and the facility type received from the drawing unit 12 (S404). That is, since the data stored in the map data storage unit 2 is composed of “facility type”, “bitmap image size”, and “bitmap image data” as shown in FIG. Bitmap image data can be searched based on the map image size. Subsequently, the storage address of the searched bitmap image data is returned to the drawing unit 12 (S405).

The drawing unit 12 selects a facility mark polygon having the same side length as the bitmap image received from the map data acquisition unit 8 (S406). In other words, as shown in FIG. 18, if any one of the facility mark polygon small 21a, the facility mark polygon middle 21b, and the facility mark polygon large 21c having different overall sizes is displayed as the facility mark polygon, as shown in FIG. As shown in FIG. 19, the storage unit 2 stores, as bitmap images, a bitmap image data small 22a, a bitmap image data 22b, and a bitmap image data large 22c having the same 1-bit size and different overall sizes. , Their bitmap image data 2
Facility mark polygons 21a-2 from 2a-22c
Bitmap image data having an image size corresponding to 1c is selected.

Subsequently, the searched bitmap image data is converted into three-dimensional coordinates and attached to each surface of the facility mark polygon (S407). That is, the bitmap image data 22a to 22c selected as shown in FIG.
Image size and facility mark polygons 21a-21c
Can be directly attached only by executing the three-dimensional coordinate transformation.

Therefore, as shown in FIG. 21, since the size of one dot of the facility mark is the same regardless of the distance from the virtual viewpoint to the facility mark display section 15, the display of the facility mark is prevented from being coarse. can do.

FIG. 22 shows an example of a three-dimensional display of the map screen on which the facility selection processing has been performed as described above. In FIG. 22, for example, the facility mark display unit 15 is displayed on the building where the convenience store is located.
When drawing on the rooftop or the like, or when drawing on the support 16, the bitmap image data is not drawn by enlarging the bitmap image data according to the distance from the virtual viewpoint to the facility mark display unit 15. The small bitmap image data 22a is selected, the middle bitmap image data 22b is selected when the distance is intermediate from the virtual viewpoint, and the large bitmap image data 22c is selected when the distance from the virtual viewpoint is small, and the facility mark polygons 21a-21 are selected.
Directly attached to c.

According to the sixth embodiment, the facility mark display section 15 enlarged to a position close to the virtual viewpoint is provided.
Instead of drawing, the appropriate bitmap image data is selected from the bitmap image data 22a to 22c having the same size of one dot in accordance with the distance from the virtual viewpoint, and is directly applied to the facility mark polygons 21a to 21c. Since the drawing is performed by pasting, it is possible to display a clear facility mark to the user regardless of the distance from the virtual viewpoint to the facility mark display unit 15.

The present invention is not limited to the above embodiments, but can be modified or expanded as follows. The facility mark may be highlighted by rotating and displaying the facility mark display unit 15.

The facility mark display section 15 may have a polygonal shape or a spherical shape. In this case, the facility mark is appropriately displayed on the facility mark display section so as to be visible.

Further, the floor where the facility is located may be additionally displayed on the facility mark display section 15. Furthermore, the facility mark display unit 15 may be rotated and displayed so that the facility mark is located in front of the virtual viewpoint with a change in the position of the virtual viewpoint.

[Brief description of the drawings]

FIG. 1 is a diagram showing a three-dimensional display according to a first embodiment of the present invention.

FIG. 2 is a block diagram schematically showing an entire configuration.

FIG. 3 is a flowchart illustrating an operation of a control unit.

FIG. 4 is a diagram showing a three-dimensional display before selecting a facility;

FIG. 5 is a diagram for explaining attachment of basic bitmap image data to facility mark polygons;

FIG. 6 is a diagram showing a display example of a facility mark display unit when a virtual viewpoint is changed.

FIG. 7 is a view corresponding to FIG. 1 shown in a different display mode.

FIG. 8 is a view corresponding to FIG. 3, showing a second embodiment of the present invention;

FIG. 9 is a diagram corresponding to FIG. 1;

FIG. 10 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 11 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 12 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention;

FIG. 13 is a diagram illustrating bitmap image data for comparison according to a sixth embodiment of the present invention.

FIG. 14 is a flowchart showing the operation of the control unit.

FIG. 15 is a flowchart showing the operation of a characteristic part of the control unit;

FIG. 16 is a diagram showing a distance from a virtual viewpoint to a facility mark display unit.

FIG. 17 is a schematic diagram showing bitmap image data.

FIG. 18 is a diagram showing facility mark polygons having different sizes.

FIG. 19 is a diagram showing bitmap images of different sizes.

FIG. 20 is a diagram for explaining attachment of bitmap image data to facility mark polygons;

FIG. 21 is a diagram showing a facility mark display unit according to a distance from a virtual viewpoint.

FIG. 22 is a diagram corresponding to FIG. 1;

[Explanation of symbols]

2 is a map data storage unit (corresponding to a storage unit), 7 is a control unit (display control unit), 14 is a building, 15 is a facility mark display unit (facility identification display unit), 16 is a support, and 21a to 21c are facility marks. Polygons 22a to 22c are bitmap image data.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Junichi Ando 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in Denso Corporation (reference) 2C032 HB05 HC23 HC27 2F029 AA02 AB01 AB07 AB09 AC01 AC02 AC04 AC18 AD01 5H180 AA01 BB13 FF04 FF05 FF22 FF25 FF27 FF32 FF38

Claims (11)

[Claims] 1. A map display device for three-dimensionally displaying a building or the like on a screen, wherein when a facility identification display unit for identifying a facility is hidden by the building, the facility identification display unit is displayed in a visible form. A map display device comprising display control means. 2. The facility according to claim 1, wherein, when the facility is located in a building, the display control means displays the facility identification display unit in a form associated with the building so as to be visible. Map display device. 3. The map display device according to claim 1, wherein the display control unit displays the facility identification display unit in a form that is visible regardless of a change in the viewpoint of a screen display. 4. The map display device according to claim 3, wherein said display control means displays said facility identification display section in a three-dimensional shape. 5. The map display device according to claim 2, wherein the display control means displays the facility identification display section at a rooftop position of a building where the facility is located. 6. The map display device according to claim 1, wherein the display control means displays the facility identification display portion in a form supported by a support. 7. The display control means, when displaying the facility identification display section overlapping another facility identification display section, displaces the facility identification display section to a visible position, and displays the facility identification display section. The map display device according to any one of claims 1 to 6, wherein 8. The map display device according to claim 7, wherein the display control means displays the facility identification display on a wall surface of the building when the facility identification display is shifted. 9. The map display device according to claim 1, wherein the facility identification display unit is a name of a building. 10. The map display device according to claim 1, wherein the facility identification display section is a mark indicating a type of a store. 11. A storage unit for storing display data of the facility identification display unit as a plurality of bitmap image data having the same dot size and different overall sizes, wherein the display control unit is configured to display the facility from a viewpoint of screen display. The map display device according to any one of claims 1 to 10, wherein bitmap image data is selected according to a distance to the identification display unit and is displayed as the facility identification display unit.