JP2011137907A - Map display device, map display method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a map display device, easily performing desired enlargement display even when an area having a detailed map exists only in a part of a screen in the case of displaying a map image to an enlarged scale using map data of two or more hierarchies, and also to provide a map displaying method and program. <P>SOLUTION: When a wide area map is output, the map display device is provided with a slide enlargement control means for switching to an output of a detailed map by shifting display coordinates of a map image so that the map image of a detailed map area (48) occupies a display frame (13A) when the detailed map area (48) is included in the display frame (13A) and the detailed map area (48) is located off the center point 45 of enlargement. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a map display device that displays a map image, a map display method, and a program thereof.

  From the past, when an enlargement operation was performed using multiple levels of map data at different scales, from the display of a wide area map using one level of map data to the display of a detailed map using the map data of the next level And a map display device capable of displaying a map image in an enlarged manner.

  In the case of multi-level map data, the map data included in the map data may differ in size between map data of a small scale and map data of a large scale. For example, the wide area map data may include the entire region of the European continent, while the detailed map data may include only images around the city.

  Further, as a related art related to the present invention, Patent Document 1 discloses that a wide area map image is displayed on the entire screen by changing the current position to a position deviating from the center of the screen when performing wide area display. Techniques for doing so are disclosed. Patent Document 2 discloses a technique for complementing and displaying an image in a range without map data when displaying a detailed map. In Patent Document 3, when a wide-area map is displayed, an area that the user is expected to display a detailed map is displayed in a square frame, and this part is displayed by the user performing an instruction operation on the portion of the square frame. A technique for displaying and outputting a detailed map is disclosed.

JP 2004-138409 A JP-A-10-293534 JP 2008-009105 A

  In a general map display device, when a map image is enlarged and displayed, the map image is enlarged in a state where the coordinates on the map of the enlargement center point set on the screen are fixed. However, when switching from outputting a map image using wide-area map data to outputting a map image using detailed map data, the area of the detailed map is only sparsely included in the display area of the wide-area map. There can be. In this case, to switch the output of the map image from the wide area map to the detailed map, move the display area of the map while displaying the wide area map, and move the area with the detailed map to the enlarged center point on the screen. It is necessary to perform an enlargement operation after that.

  Otherwise, when you perform an enlargement operation, there is no detailed map data to be displayed on the screen and no map image is displayed, or there is no map image and the enlargement display process is not executed. It becomes.

  The above-described operation of moving an area with a detailed map to the enlarged center point on the screen is very complicated when the area of the detailed map is small. In addition, when the map display range can be moved only at a large interval, there may be a case where the area of the detailed map cannot be adjusted to the enlarged center point on the screen.

  It is an object of the present invention to easily display an enlarged map image using a plurality of map data having different map ranges and details, even if an area with a detailed map appears only on a part of the screen. It is an object to provide a map display device, a map display method, and a program thereof that can perform a desired enlarged display.

In order to achieve the above object, the invention according to claim 1
Display means having a display frame and displaying an image in the display frame;
First map data showing a map image of the first range on the earth, a map image that is smaller than the map image of the first map data for the second range that overlaps with the first range and is smaller than the first range Map data storage means storing the second map data indicated by;
First display control means for displaying a map image in the first range in the display frame based on the first map data;
Second display control means for displaying a map image in the second range in the display frame based on the second map data;
Enlargement control means for enlarging the map image from display of the map image by the first display control means and switching to display of the map image by the second display control means;
With
The enlargement control means includes
When the map image is output by the first display control means, the area of the second range is included in the map image displayed in the display frame, and the area of the second range is in the display frame. When it is at a position outside the preset center point,
A map that includes a slide enlargement control unit that shifts the display range of the map image so that the map image of the second range falls within the display frame and switches to display of the map image by the second display control unit. It is a display device.

The invention according to claim 2 is the map display device according to claim 1,
The slide enlargement control means includes
The display range of the map image is shifted and switched to the display of the second display control means so that the map image of the second range occupies the entire area within the display frame.

The invention described in claim 3 is the map display device according to claim 1,
The first display control means includes
When the area of the second range is included in the map image displayed in the display frame, an area representing the area is displayed together.

The invention according to claim 4 is the map display device according to claim 1,
The first display control means includes
In addition to displaying a circular area centered on the enlargement center point in the display frame,
The slide enlargement control means includes
When the region of the second range is included in the circular region and the region of the second range is at a position deviating from the enlargement center point,
Control for switching to display by the second display control means is executed by shifting the display range of the map image so that the map image of the second range falls within the display frame.

The invention according to claim 5 is the map display device according to claim 1,
It has a moving operation means for inputting a command to move the display range of the map image from the outside,
The first display control means includes
Based on the command to move the display range, the display range of the map image to be displayed in the display frame is moved in units of blocks.

The invention according to claim 6 is the map display device according to claim 1,
It has an enlargement operation means for inputting a map image enlargement command from the outside,
The expansion control means includes
Based on the map image enlargement command, control for switching from displaying the map image by the first display control means to displaying the map image by the second display control means is executed.

The invention according to claim 7 is the map display device according to claim 1,
The enlargement control means includes
When the enlargement center point is covered by the region of the second range when the map image is output by the first display control unit,
A normal enlargement control means for switching from the display of the map image by the first display control means to the display of the map image by the second display control means with the coordinates of the map image overlapping the enlargement center point fixed. It is a feature.

The invention described in claim 8
Display means having a display frame and displaying an image in the display frame; first map data showing a map image of the first range on the earth; and the first range having an overlap with the first range. A map display method for displaying a map image in the display frame using second map data showing a map image finer than the map image of the first map data for a smaller second range,
A first display control step of displaying a map image in the first range in the display frame based on the first map data;
A second display control step for displaying a map image in the second range in the display frame based on the second map data;
An enlargement control step of enlarging the map image from display of the map image by the first display control step and switching to display of the map image by the second display control step;
Including
The enlargement control step includes
When an area of the second range is covered with an enlargement center point set in advance in the display frame when the map image is output in the first display control step,
A normal enlargement control step of switching to display of the map image by the second display control step in a state where the coordinates of the map image overlapping the enlargement center point are fixed;
When the map image is output by the first display control step, the map image displayed in the display frame includes the region of the second range, and the region of the second range is from the enlargement center point. If it ’s out of position,
A slide enlargement control step of shifting the display range of the map image so that the map image of the second range falls within the display frame and switching to the display of the map image by the second display control step;
Is included in the map display method.

The invention according to claim 9
Display means having a display frame and displaying an image in the display frame; first map data showing a map image of the first range on the earth; and the first range having an overlap with the first range and the first range A computer that controls a map data storage unit that stores second map data in which a map image finer than the map image of the first map data is displayed for a second range smaller than the range;
A first display control function for displaying a map image in the first range in the display frame based on the first map data;
A second display control function for displaying a map image in the second range in the display frame based on the second map data;
An enlargement control function for enlarging the map image from display of the map image by the first display control function and switching to display of the map image by the second display control function;
Realized,
further,
The enlargement switching control function includes
When an area of the second range is covered with an enlarged center point set in advance in the display frame when the map image is output by the first display control function,
A normal enlargement control function for switching to display of the map image by the second display control function in a state where the coordinates of the map image overlapping the enlargement center point are fixed;
When the map image is output by the first display control function, the area of the second range is included in the map image displayed in the display frame, and the area of the second range is from the enlargement center point. If it ’s out of position,
A slide enlargement control function for shifting the display range of the map image so that the map image of the second range falls within the display frame and switching to display of the map image by the second display control function;
Is included in the program.

  According to the present invention, even if the area of the map image of the second map data deviates from the enlargement center point by the slide enlargement control, the display range of the map image is shifted so that the map image enters the display frame, and the enlarged display is performed. Thus, the user can easily perform a desired enlarged display without performing a complicated operation.

It is a block diagram which shows the whole structure of the map display apparatus of embodiment of this invention. It is explanatory drawing which shows the map data of the 1st hierarchy contained in a map database. It is explanatory drawing which shows the map data of the 2nd hierarchy contained in a map database. It is explanatory drawing which shows the map data of the 3rd hierarchy contained in a map database. It is explanatory drawing which shows the map data of the 4th hierarchy contained in a map database. It is explanatory drawing which shows the map data of the 5th hierarchy contained in a map database. It is a figure explaining the display control content based on operation of expansion / contraction. It is an image figure which shows an example of the map display before expansion operation. It is an image figure which shows an example of the map display displayed when expansion operation is performed in the state of FIG. It is a figure explaining the range of the map image displayed when expansion operation is performed in the state of FIG. It is a flowchart which shows the control procedure of the main control process performed by CPU. It is a flowchart which shows the control procedure of the map display process performed by step S3 of FIG. 11, S6. It is a flowchart which shows the control procedure of the zoom process performed by step S5 of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the overall configuration of a map display device according to an embodiment of the present invention.

  The map display device 1 of this embodiment displays a map image on the display screen 13A of the display device 13, moves the display range of the map image up and down, left and right, and enlarges the map image according to a user operation. It is a device that can be displayed or reduced.

  As shown in FIG. 1, the map display device 1 includes a CPU (central processing unit) 10 that executes a program, a memory 11 that includes a RAM (Random Access Memory) that provides a working memory space to the CPU 10, and the like. A ROM (Read Only Memory) 12 storing a control program executed by the CPU 10 and control data, a display device 13 for displaying an image such as a liquid crystal display, an operation unit 14 for inputting a user command from the outside, and a plurality of layers A map database 20 storing the map data, and a bus 18 for transferring data and commands between the respective units.

  2 to 6 are explanatory diagrams showing map data of the first layer to the fifth layer included in the map database 20.

  The map database 20 stores map data 21 to 25 of the first to fifth layers shown in FIGS. The map data 21 to 25 gradually increase in scale of the map and the details of the map image as the hierarchy progresses from the map data 21 of the first hierarchy to the map data 25 of the fifth hierarchy. ing. In addition, the map data 21 in the first hierarchy includes most of the map images on the earth, whereas the map ranges included in the map data 22 to 25 in the second to fifth hierarchies are as follows. As the hierarchy progresses, it becomes a small range. Further, the map data 21 of the first hierarchy has a small scale, and the data amount of the image is as small as, for example, one sheet at a predetermined image size, but the map data 22 to 25 of the second hierarchy to the fifth hierarchy. The amount of data is as large as a plurality of images with a predetermined image size.

  The ROM 12 stores software (programs) that are executed by the CPU 10 to realize various functional modules. In this functional module, a map display processing unit 12a for displaying and outputting a map image of this range on the display device 13 by designating the map data layer, the coordinates of the display range, and the like, and a map image corresponding to the enlargement operation are displayed. A zoom processing unit 12b that controls enlargement display, a map region recognition unit 12c that recognizes a region of a map image in another layer included in the display range when the map image is displayed, and the like are included.

  The ROM 12 stores a program for main control processing for controlling display of a map image using the plurality of functional modules. The program for realizing the above functional modules and the program for the main control processing are stored in the ROM 12 and, for example, a portable storage medium such as an optical disk and a nonvolatile memory such as a flash memory that can be read by the CPU 10 via a data reader. It is possible to store it in the memory. In addition, a form in which such a program is downloaded to the map display device 1 via a communication line using a carrier wave as a medium can be applied.

  FIG. 7 is a diagram for explaining the contents of display control using map data of a plurality of hierarchies accompanying an enlargement / reduction operation. In this figure, the horizontal direction indicates the range of the map image included in the map data, and the vertical direction indicates the state of enlargement / reduction of the map display. Moreover, the part of the square frame which attached | subjected the codes | symbols 21-25 represents each map data 21-25 of the 1st hierarchy-the 5th hierarchy mentioned above. A downward arrow indicates an enlargement operation, an upward arrow indicates a reduction operation, and “NOP” indicates that further enlargement / reduction operations cannot be performed.

  Although not particularly limited, as shown in FIG. 7, the map data 21 in the first layer and the map data 22 in the second layer include a wide range of map images, while the map in the third layer. The data 23 includes a map image of a partial range, and a map image of a partial range is omitted. Further, the map data 24 of the fourth hierarchy and the map data 25 of the fifth hierarchy include a discontinuous detailed map image of a partial range.

  In the map display device 1 of this embodiment, as shown by the downward arrow in FIG. 7, it is possible to display a map image at three levels of magnification using map data of one layer, By shifting to the map data of the next hierarchy, it is possible to perform further enlarged map display.

  Specifically, as shown in a range X1 of FIG. 7, if the map data is included in the map data 21 to 25 of all layers, the map data 21 of the first layer is displayed as a first display. The first level of the map data 21 of the hierarchy, the second level of the map data 21 of the first level, the one-time display of the map data 22 of the second level, and the first level of the map data 22 of the second level Magnified display of the eyes, second-level enlarged display of the map data 22 of the second hierarchy,..., Enlarged display of the second level of the map data 25 of the fifth hierarchy can be enlarged in stages. It has become.

  In addition, as shown in a range X2 in FIG. 7, if the map data 23 in the middle layer does not include the map image and the map data 22 and 24 in the previous and subsequent layers include the map image, the map data 23 It is possible to skip the display of the middle layer without an image and directly shift to the enlarged display of the map data 24 of the next layer.

  Furthermore, as shown in the range X3 of FIG. 7, if the map data 24, 25 after the middle layer is an area that does not include the map image, the enlarged display after the middle layer is not possible.

  FIG. 8 shows an image diagram showing an example of an enlarged display at the second level of the third hierarchy, and FIG. 9 shows an example of a map display output when an enlargement operation is performed from the display of FIG. Image views are shown respectively.

  In the map display device 1 of this embodiment, as shown in FIG. 8, a map image is displayed on the display screen 13A of the display device 13, and what level and number of levels the map image is displayed on. Are displayed, and a radar mark 44 surrounding the enlarged center point 45 of the map display in a circle is displayed.

  Furthermore, in the map display device 1 of this embodiment, as shown in FIG. 8, when the second-stage enlarged display of the map data of one hierarchy is made, a part of the map hierarchy of the next hierarchy is displayed. When a map image area is included, a detailed map area 48 representing the area is displayed.

  Further, when the user performs an enlargement operation, normally, the map image is enlarged and displayed with the coordinates of the enlargement center point 45 on the map fixed. As shown in FIG. If there is a detailed map area 48 indicating the area of the map image of the next hierarchy within the range of the radar mark 44 at a place outside 45, the map image of the next hierarchy is shown in FIG. The display range of the map image is moved so as to occupy the entire display screen 13A, that is, the coordinates of the enlargement center point 45 on the map are shifted and enlarged display is performed.

  FIG. 10 is an explanatory diagram showing the range of the map image output in the enlarged display of FIGS. 8 to 9.

  As a specific example, a detailed map area 48 shown in FIG. 8 represents the entire area of a continuous map image included in the map data 24 (see FIG. 10) in the fourth hierarchy. In this case, the location closest to the center point 45 of the radar mark 44 in the detailed map region 48 is set as the base point P0, and the region for one screen in the range closest to the base point P0 in the map data 24 in the fourth layer. F is set as the display range of the next enlarged display. Accordingly, the coordinates on the map of the enlargement center point 45 are shifted along with the enlargement display. For example, in the map image before enlargement in FIG. 8, the location P1 on the map where the river bends at a right angle is located far away from the enlargement center point 45, but in the map image after enlargement in FIG. Is shifted to the vicinity of the enlargement center point 45.

  Even when the area of the map image of the detailed hierarchy is included only in a part of the display screen 13A by the process of enlarging and displaying such a display range, the area is moved to the position of the enlargement center point. It is possible to enlarge and display the map image of this area by simply performing the enlargement operation as it is without performing a complicated operation. In the above-described enlarged display, the map data 23 of the third hierarchy constitutes the first map data, the map data 24 of the fourth hierarchy constitutes the second map data, and the display control of the map image of the third hierarchy before the enlarged display. The first display control means is configured by performing the display, and the second display control means is configured by performing the display control of the map image of the fourth layer after the enlarged display.

  Hereinafter, an example of a control procedure of the main control process for realizing the above-described enlargement operation will be described based on a flowchart.

  FIG. 11 shows a flowchart of the main control process executed by the CPU 10.

  This main control process is a process that is started and executed continuously when the map display device 1 is powered on. In the main control process, in steps S1, S4, and S7, the CPU 10 confirms the input from the operation unit 14, and the map is moved up / down / left / right, enlarged, or reduced. It is repeatedly determined whether or not it has been received.

  If it is determined that the moving operation has been performed in the determination process of step S1, the process proceeds to step S2, and a process of shifting the coordinates of the display range by a certain amount according to the up / down / left / right directions of the moving operation is performed. In this embodiment, the coordinates for one block (for example, 10 to 200 pixels of the display screen 13A) are shifted by a single movement operation and reflected in the setting data of the memory 11. Then, it transfers to step S3 and performs the map display process mentioned later. Thereby, the map image displayed on the display screen 13A of the display device 13 is updated, and the map image whose display range is shifted is displayed.

  If it is determined that the enlargement operation has been performed in the determination process in step S4, the process proceeds to step S5, and the process of switching the hierarchy of map data or changing the coordinates of the display range according to the enlarged display is performed by a zoom process described later. These changes are reflected in the setting data in the memory 11. Subsequently, in step S6, a map display process is executed to actually display and output the map image after the zoom process.

  If it is determined that the reduction operation has been performed in the determination process of step S7, the process proceeds to step S8, where the map data layer is switched and the coordinates of the display range are converted so as to expand the display range of the map image by one step. Processing is performed, and these changes are reflected in the setting data in the memory 11. Subsequently, a map display process is executed in step S9 to actually display and output the reduced map image.

  FIG. 12 shows a flowchart of the map display process executed in steps S3, S6 and S9 of FIG.

  When the process proceeds to the map display process, first, the CPU 10 obtains the current map data hierarchy, the number of stages of the enlarged display, and the coordinates of the display range from the setting data in the memory 11 (steps S11, S12, S13). And the data of the map image of the display range is read from the map data of the present hierarchy, and this map image is displayed on the whole display screen 13A (step S14). Further, the radar mark 44 is displayed at a predetermined position on the display screen 13A (step S15).

  Next, the CPU 10 determines whether or not the current number of stages of enlarged display is the second stage (step S16), and if it is not the second stage, ends the map display process as it is. On the other hand, if it is the second level, it is determined whether or not the area of the map image (detailed map area 48) of the map data of the next layer is included in the display range (step S17). Exit. On the other hand, if there is, the detailed map area 48 is displayed in the corresponding range of the display screen 13A (step S18). And this map display process is complete | finished.

  With this map display processing, the map image and radar mark 44 are actually displayed and output according to the hierarchical number of the current map data and the coordinate data of the display range set based on the movement operation and the enlargement / reduction operation, In the case of the enlarged display on the second stage, the detailed map area 48 is also displayed.

  FIG. 13 shows a flowchart of the zoom process executed in step S5 of FIG.

  When the zoom process is started, first, the CPU 10 determines whether the current enlarged display is the first-stage enlarged display, the second-stage enlarged display in the same hierarchy, or the enlarged display to the next hierarchy ( Step S1). As a result, if the display is not enlarged to the next layer, the process branches to step S29.

  When the process proceeds to step S22, the CPU 10 first recognizes the detailed map area 48 included in the display range (step S22), and determines whether there is a detailed map area 48 that partially overlaps the radar mark 44 (step S23). . As a result, if it is determined that there is no image, it is determined that further enlargement display cannot be performed, and the zoom process is terminated as it is. On the other hand, if it is determined that it exists, it is determined whether or not the detailed map area 48 overlaps the enlargement center point 45 (step S24).

  If the enlargement center point 45 and the detailed map area 48 overlap as a result of the discrimination processing in step S24, the process branches to step S29 to perform normal enlargement display, but if not, the map coordinates of the enlargement center point 45 exist. The process proceeds to step S25 in order to perform enlarged display with a shift.

  In step S25, the CPU 10 confirms whether there are a plurality of detailed map areas or one (step S25). If there are a plurality of detailed map areas, the CPU 10 selects the detailed map area 48 closest to the enlargement center point 45 as an enlargement display target. (Step S26). Here, when there are a plurality of detailed map areas that are equidistant from the enlargement center point 45, the enlargement display target area may be selected according to the size of the area. On the other hand, if there is only one discrimination result in step S25, the detailed map area 48 is selected as an enlarged display target, and the process proceeds to step S27.

  In step S27, the coordinate point closest to the enlargement center point in the detailed map area 48 selected as the enlargement display target is calculated as the base point P0 (see FIG. 8) (step S27), and the map data of the next layer is calculated. In the map image, an area F (see FIG. 10) for one screen closest to the base point P0 is set as a display range (step S28). Then, the zoom process ends. The slide enlargement control means is configured by the processes in steps S25 to S28.

  On the other hand, when the process proceeds to step S29, if the display is determined to be the first or second enlarged display, the coordinate position of the enlargement center point 45 is fixed in the map image of the map data of the same hierarchy. In this state, an area where the display range is narrowed by one step is set as a new display range, and if the process proceeds to step S29 in the enlarged display to the next layer, the coordinate position of the enlargement center point 45 is fixed and the next position is fixed. An area for one screen is set as a new display range from the hierarchical map data. Then, the zoom process ends. The normal enlargement control means is configured by the processing in step S29.

  Then, in the map display process (step S6 in FIG. 11) executed following this zoom process, the map image of the set display range is output to the display screen 13A.

  As described above, according to the map display device 1 of the present embodiment, the area of the map image (detailed map area 48) of the next layer is located away from the enlargement center point 45 by the zoom process. However, since the display range is shifted so that the map image enters the display screen 13A and the enlarged display is performed, the user can perform the desired operation without performing a complicated operation such as moving the detailed map area 48 to the enlargement center point 45. Can be enlarged.

  Furthermore, according to the map display device 1 of this embodiment, at the time of the above enlarged display, the display range is shifted so that the map image of the detailed map area 48 occupies the entire area of the display screen 13A, and the enlarged display is performed. Therefore, compared with the case where the map image of the detailed map area 48 is enlarged and displayed so as to slightly enter the display screen 13A, an enlarged display that is more useful for the user is realized.

  In addition, since the detailed map area 48 is displayed on the map image at the time of the enlarged display on the second stage, the user can see the display and enlarge the display to the next layer. It is possible to easily recognize at which point the map image is enlarged when performing enlarged display.

  Further, according to the map display device 1 of this embodiment, when the radar mark 44 is displayed on the map image and the detailed map area 48 is inside the radar mark 44, the detailed map area 48 is enlarged by an enlargement operation. For example, when a plurality of detailed map areas 48 appear on the display screen 13A, the user can easily select which area is enlarged and displayed by using the radar mark 44. It becomes possible.

  Further, according to the map display device 1 of this embodiment, the map image moves in units of one block (for example, 10 to 200 pixels of the display screen 13A) by a single movement operation, so the detailed map area 48 is very large. If it is small, it may be impossible to align the detailed map area 48 with the enlarged center point 45. For example, in a region where there is no map image in the map data 23 of the third hierarchy and the enlarged display is made directly from the second hierarchy to the fourth hierarchy, the detailed map belonging to the fourth hierarchy during the display of the map image of the third hierarchy Since the area 48 is displayed, the detailed map area 48 becomes very small, and it is very difficult to match it with the enlargement center point 45. Therefore, the above enlarged display control is particularly effective for such a configuration.

  Further, when the enlarged display using the map data of the same hierarchy is used, or the area of the map image of the map data of the next hierarchy is wide, the map image of the next hierarchy is displayed on the entire display screen 13A even if enlarged as it is. In this case, since the enlarged display is performed with the coordinates of the enlarged central point 45 being fixed, the user does not lose sight of the display point even during the normal enlarged display.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above embodiment, when the display range is shifted and enlarged display is performed, the display range is shifted so that the enlarged map image occupies the entire area of the display screen 13A. In order to indicate that it is the peripheral portion of the display screen, the display range may be shifted so that one side portion of the display screen 13A becomes a blank display, and the enlarged display may be performed.

  In the above embodiment, when the enlarged display is performed by shifting the display range, the display range is such that the end portion of the detailed map area 48 closest to the enlargement center point 45 comes to the end of the display screen 13A after the enlarged display. However, it is also possible to display the central portion of the detailed map area 48 on the display screen 13A after the enlarged display.

  In the above embodiment, the map image is displayed over the entire area of the display screen 13A. However, a display frame is set in a part of the display screen 13A, and the map is displayed within the display frame. May be. In addition, the detailed configuration and the detailed method shown in the embodiments can be appropriately changed without departing from the spirit of the invention.

1 Map display device 10 CPU (computer)
11 Memory 12 ROM
12a Map display processing unit 12b Zoom processing unit 12c Map area recognition unit 13 Display device 13A Display screen (display frame)
14 Operation unit (moving operation means, enlargement operation means)
20 Map database (map data storage means)
44 Radar mark (circular area)
45 Enlarged center point 48 Detailed map area (2nd area display)
P0 base point

Claims (9)

Display means having a display frame and displaying an image in the display frame;
First map data showing a map image of the first range on the earth, a map image that is smaller than the map image of the first map data for the second range that overlaps with the first range and is smaller than the first range Map data storage means storing the second map data indicated by;
First display control means for displaying a map image in the first range in the display frame based on the first map data;
Second display control means for displaying a map image in the second range in the display frame based on the second map data;
Enlargement control means for enlarging the map image from display of the map image by the first display control means and switching to display of the map image by the second display control means;
With
The enlargement control means includes
When the map image is output by the first display control means, the area of the second range is included in the map image displayed in the display frame, and the area of the second range is in the display frame. When it is at a position outside the preset center point,
A map that includes a slide enlargement control unit that shifts the display range of the map image so that the map image of the second range falls within the display frame and switches to display of the map image by the second display control unit. Display device. The slide enlargement control means includes
2. The map display according to claim 1, wherein the display range of the map image is shifted and switched to the display of the second display control means so that the map image of the second range occupies the entire area within the display frame. apparatus. The first display control means includes
2. The map display device according to claim 1, wherein when the area of the second range is included in the map image displayed in the display frame, the area display representing the area is also performed. The first display control means includes
In addition to displaying a circular area centered on the enlargement center point in the display frame,
The slide enlargement control means includes
When the region of the second range is included in the circular region and the region of the second range is at a position deviating from the enlargement center point,
2. The map display according to claim 1, wherein a control is performed to shift the display range of the map image so that the map image of the second range falls within the display frame and to switch to the display by the second display control unit. apparatus. It has a moving operation means for inputting a command to move the display range of the map image from the outside,
The first display control means includes
2. The map display device according to claim 1, wherein the display range of the map image displayed in the display frame is moved in units of blocks based on a command to move the display range. It has an enlargement operation means for inputting a map image enlargement command from the outside,
The expansion control means includes
2. The map according to claim 1, wherein control for switching from display of the map image by the first display control means to display of the map image by the second display control means is executed based on the map image enlargement command. Display device. The enlargement control means includes
When the enlargement center point is covered by the region of the second range when the map image is output by the first display control unit,
A normal enlargement control means for switching from the display of the map image by the first display control means to the display of the map image by the second display control means with the coordinates of the map image overlapping the enlargement center point fixed. The map display device according to claim 1, wherein Display means having a display frame and displaying an image in the display frame; first map data showing a map image of the first range on the earth; and the first range having an overlap with the first range. A map display method for displaying a map image in the display frame using second map data showing a map image finer than the map image of the first map data for a smaller second range,
A first display control step of displaying a map image in the first range in the display frame based on the first map data;
A second display control step for displaying a map image in the second range in the display frame based on the second map data;
An enlargement control step of enlarging the map image from display of the map image by the first display control step and switching to display of the map image by the second display control step;
Including
The enlargement control step includes
When an area of the second range is covered with an enlargement center point set in advance in the display frame when the map image is output in the first display control step,
A normal enlargement control step of switching to display of the map image by the second display control step in a state where the coordinates of the map image overlapping the enlargement center point are fixed;
When the map image is output by the first display control step, the map image displayed in the display frame includes the region of the second range, and the region of the second range is from the enlargement center point. If it ’s out of position,
A slide enlargement control step of shifting the display range of the map image so that the map image of the second range falls within the display frame and switching to the display of the map image by the second display control step;
A map display method characterized by comprising: Display means having a display frame and displaying an image in the display frame; first map data showing a map image of the first range on the earth; and the first range having an overlap with the first range and the first range A computer that controls a map data storage unit that stores second map data in which a map image finer than the map image of the first map data is displayed for a second range smaller than the range;
A first display control function for displaying a map image in the first range in the display frame based on the first map data;
A second display control function for displaying a map image in the second range in the display frame based on the second map data;
An enlargement control function for enlarging the map image from display of the map image by the first display control function and switching to display of the map image by the second display control function;
Realized,
further,
The enlargement switching control function includes
When an area of the second range is covered with an enlarged center point set in advance in the display frame when the map image is output by the first display control function,
A normal enlargement control function for switching to display of the map image by the second display control function in a state where the coordinates of the map image overlapping the enlargement center point are fixed;
When the map image is output by the first display control function, the area of the second range is included in the map image displayed in the display frame, and the area of the second range is from the enlargement center point. If it ’s out of position,
A slide enlargement control function for shifting the display range of the map image so that the map image of the second range falls within the display frame and switching to display of the map image by the second display control function;
A program characterized by being included.

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