KR100523147B1 - Automatic zooming in and out function and apparatus of gps terminal - Google Patents

Abstract

The present invention relates to a GPS terminal, and more particularly, to an automatic surface conversion method of a GPS terminal in which a scale ratio of geographic information displayed on a screen is automatically enlarged or reduced according to the number of guide information of a surrounding area where a vehicle is located. Relates to a device.

According to an aspect of the present invention, there is provided an automatic surface conversion method for a GPS terminal and an apparatus thereof, and a GPS receiver for receiving location information including a latitude, speed, altitude, and azimuth of a current vehicle from a GPS satellite. A map storage unit including guide information to be included, geographic information partitioned into a predetermined area, scale information (by level) geographic information for each area partitioned in the geographic information, and an appropriate to be displayed on a screen; A setting range storage unit for storing the number of guide information stored therein, and the number of guide information displayed in the area where the vehicle is located on the screen based on the location information received from the GPS receiver, and the information stored in the setting range storage unit. Compared with the setting range of the information, the scale ratio of the screen is automatically reduced or expanded by reading the geographical information by the scale ratio (by level) for the corresponding area. It is characterized in that it comprises an automated surface control unit.

Description

Automatic surface conversion method and apparatus therefor for GPS terminal {Automatic zooming in and out function and apparatus of GPS terminal}

The present invention relates to a GPS terminal, and more particularly, the scale ratio of the geographic information displayed on the screen is automatically enlarged or reduced according to the number of guide information of the surrounding area where the vehicle is located to provide an optimal screen. The present invention relates to an automated surface conversion method and apparatus for a GPS terminal capable of driving.

In general, starting with the Geographic Information System (GIS), which stores maps on a storage medium so that users can easily display and view the maps by using a terminal means such as a computer. GPS system technology that uses Global Positioning System (GPS) information to detect and verify your location and to easily find the distance and shortest route from its location to your desired location In addition, as the GPS system for vehicles has become more common, services that users can receive through GPS terminals have been expanded.

The GPS terminal as described above has a function to enlarge or reduce road information, and to display a zoom ratio on a screen around a specific area, to specify a destination or to look up an arbitrary location on a map. there was.

As described above, the scale-up and reduction-scale functions are provided with various numbers of scale levels according to the type and performance of the GPS terminal. The scale-up and scale-down maps are also provided. It was designated to be easy to see.

In other words, the user may specify the enlargement and reduction of the map for a specific destination or for other purposes, but generally, the vehicle is used based on the scale level automatically set on the GPS terminal when driving.

However, in the conventional GPS terminal, geographic information such as road maps, intersections, and constructions is enlarged and reduced at predetermined stages according to the map scale control switch signal, so that the driver can easily find a desired position. When increasing or decreasing, the driver needs to reduce or enlarge the scale ratio of the geographic information in order to see a wider area or an enlarged area. In this case, the driver had to operate the scale control switch individually.

Therefore, the conventional GPS terminal causes inconveniences due to the operation of the scale switch at the time of enlarging and reducing the geographical information scale ratio during driving, and thus, the driver's attention is easily dispersed and a safety accident may occur.

The prior art for solving the above problems was well represented in the "map scale control device and method of the car navigation device" of the Republic of Korea Patent Publication No. 1999-010619.

The technique disclosed in Korean Patent Laid-Open Publication No. 1999-010619 uses a vehicle speed sensor that detects a driving speed of a vehicle so that the map scale of roads and constructions displayed on the screen is automatically expanded to a log scale or a proportional ratio. And to be reduced.

As described above, the scale of the geographic information displayed on the screen is automatically adjusted according to the driving speed of the vehicle, thereby providing the driver with a visual convenience of the driving route, and the driver can easily grasp the route to the destination. There was, however, the following problems.

The conventional GPS terminal provides only a function of switching the scale ratio of the screen in conjunction with the actual speed, so that when the vehicle speed increases, an appropriate amount of information to be displayed on the GPS terminal screen so that the user can easily grasp (on the screen) The scale of the screen was changed regardless of the number of information that the driver could easily grasp with the naked eye and local characteristics (for example, downtown, river, and rural area).

Therefore, even if the actual amount of information displayed on the screen does not hinder the user even if the vehicle's driving speed is high, the driver can easily grasp the surrounding terrain by forcibly reducing the scale ratio of the screen to see a large area. There was a problem that can give you discomfort.

The present invention is to solve the above problems, it is an object of the scale ratio of the geographic information displayed on the screen is automatically enlarged or reduced according to the number of guide information of the surrounding area where the vehicle is located.

It is also an object of the user to arbitrarily set the number of guide information to be provided by the user.

In addition, it is possible to set the priority of the guide information to display the guide information to be preferentially provided by the user, it is an object to provide guide information according to the user's taste and business.

Automated surface conversion device of the GPS terminal according to the present invention for achieving the above object,

A GPS receiver for receiving location information including a latitude, speed, altitude, and azimuth of a current vehicle from a GPS satellite;

A map storage unit including guide information to be provided to a user, the geographic information partitioned into a predetermined area, and a scale ratio (by level) geographic information for each area partitioned in the geographic information;

A setting range storage unit for storing a setting range for the appropriate number of guide information to be displayed on the screen;

Based on the location information received from the GPS receiver, the number of guide information displayed in the area where the vehicle is located on the screen is determined, and compared with the setting range of the guide information stored in the setting range storage unit, for each scale ratio for the corresponding area. And an automatic surface control unit for automatically reducing or enlarging the scale ratio of the screen by reading the geographical information (by level).

In addition, the automatic surface conversion method of the GPS terminal,

a) the automatic surface control unit receiving the position information including the longitude, latitude, speed, altitude and azimuth of the current vehicle received by the GPS receiver from the GPS satellites;

b) calculating the current driving direction and the current speed of the vehicle based on the received position information, predicting the current region of the vehicle and the region to be driven in the future, and detecting an area to be displayed on the screen;

c) detecting, by the map storage unit, geographic information for each scale ratio corresponding to the detected area;

d) determining, by the automatic surface control unit, the number of guide information corresponding to the area where the vehicle is currently located on the screen from the detected geographic information for each scale ratio;

e) comparing the setting range of the number of guide information displayed on the screen with the number of guide information stored in the setting range storage unit;

and f) determining the scale ratio on the screen according to the number of guide information and controlling the display to the display unit.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 is a block diagram showing the configuration of a GPS terminal 100 according to the present invention.

The GPS terminal 100 includes a GPS receiver 110, a setting range storage unit 140, a map storage unit 150, and an automatic surface control unit 130 including sensors such as a direction detection sensor, a distance detection sensor, and a speed detection sensor. ), An input unit 170, an audio output unit 160, and a display unit 180.

Configurations other than those described above may also be added, but parts unnecessary for the description of the present invention will be omitted.

The above components will be described in more detail as follows.

The GPS receiver 110 is connected to the antenna and an antenna for receiving a GPS satellite 112 signal transmitted from the GPS satellite 112, and visual information, longitude and latitude coordinates and altitude information, movement direction and speed information and It consists of a receiving circuit and a sensor for measuring the position of the GPS satellites 112 and the signal strength.

The satellite portion of the GPS satellite 112 is largely divided into the Surveillance Data Link (SD) satellite and the GPS satellite 112 involved in the orbital monitoring of the GPS satellite 112 and the communication of information between the GPS satellite 112 and the control portion. .

A total of 24 GPS satellites 112 (i.e. 21 navigational satellites and 3 spare satellites) are in operation, and are arranged such that at least 4 satellites can be observed at any place on earth at an altitude of about 20,000KM and a 12 hour period. have. In addition, the GPS satellite 112 continuously transmits information about time, its own orbit information, general orbit information of the global satellite, reliability information about each information, and information on error correction elements required for navigation. have.

The GPS satellites use 24 NAVSTAR satellites launched by the US Department of Defense for military use. The satellites transmit power of about 10 W and receive power of about -120 dBm. The frequencies of carrier waves (carriers) transmitted by all the GPS satellites 112 are the same, and a communication method using spread spectrum is adopted to prevent interference.

Here, the communication method by spreading the spectrum is a method of assigning different encryption to each GPS satellite 112, modulating the data with the code in advance, and then modulating the carrier wave. The frequency that generates the code is chosen to be sufficiently higher than the rate of data to be transmitted.

The GPS receiver 110 is wirelessly connected to the GPS satellite 112, and demodulates or processes the radio signal (that is, the GPS signal) relayed or processed from the GPS satellite 112 (visual information and location information). It calculates and transmits to the sensor. Since the GPS satellite 112 rotates around the earth at a 12-hour period, the GPS receiver 110 uses an omnidirectional antenna and designs the device using a good noise characteristic.

The GPS receiver 110 has a structure of a simple antenna for receiving a GPS satellite signal, and a circuit for converting the received GPS satellite signal into electrical data is separately embedded in the terminal body.

In addition, the GPS receiver 110 is provided with an antenna, characterized in that it comprises a circuit for converting the received GPS satellite signal into electrical data.

In addition, the sensor is connected to the sensor input processor module of the automation surface control unit 130, and receives a demodulated signal of a relayed or processed radio signal (ie, a GPS signal) in a circuit that converts the electrical data. The sensor includes a distance detection sensor, a speed detection sensor and the like when used in a direction detection sensor and a vehicle. The azimuth detection sensor comprises an absolute direction sensor and a relative direction sensor, the absolute direction sensor detects information indicating the north-south direction as a geomagnetic sensor, and the other position sensor detects information indicating a steering angle as a gyro sensor. The distance detection sensor detects a travel distance, and the speed detection sensor detects a speed. The distance detection sensor and the speed sensor may be additionally used when used in a vehicle, and thus the configuration of the sensor may be variously modified according to the usage of the GPS terminal 100.

The setting range storage unit 140 allows the user to set the number of guide information desired to be provided, and guide information through the input unit 170 according to the resolution and size of the display unit 180 or the characteristics of the user. Any number can be set.

That is, when the number of the guide information is described, if the number of guide information displayed on the screen is too small, the amount of guide information provided to the user is insufficient, and if the number of guide information is too large, the user can easily identify the guide information. Because of this difficulty, the user's setting or the manufacturer sets an appropriate number of setting ranges to store the criteria in which a constant scale ratio is converted from low to high or from high to low.

The setting range of the guide information stored in the setting range storage unit 140 may be set according to the resolution and size of the characters displayed on the screen, or the user may be set to any one of several to several tens of ranges.

First of all, in order to set the guide information according to the resolution and size of the characters displayed on the screen, the guide information limited to a flat leaf (number of scales within 1 inch; Mesh) of a fixed VGA (640 x 480) size In consideration of the font size of the font and overlapping with each other to place the information and icons up to about 25 characters. The number of guide information is preferably about 10-30 pieces of guide information on one screen.

The number of the guide information is properly set according to the specifications or resolution of the user's display unit basically when the manufacturer releases the product.

As a specification or resolution of the display unit 180, there is a video graphics adapter (VGA), which is a graphic display standard adopted by IBM in the United States for the PS / 2 series of personal computers. It represents a resolution of 640x480. In recent years, extended VGA cards with higher resolutions and more colors than VGA have also been released, which offer resolutions of over 800 ㅧ 600 and 256 colors. Therefore, the display unit is expressed in VGA (640 x 480) and various kinds of resolutions, but depends on the TFT, STN, and LCD.

In addition, the user can directly set through the input unit 170 according to the taste and characteristics of the user. For example, the number of guide information to be displayed by a user on one screen may be set to 10-30, or 10-10 may be set to the number of guide information of one screen.

The map storage unit 150 includes guide information to be provided to a user, and includes geographic information divided into predetermined regions and geographic information for each of the regions divided by the geographic information. It consists of RAM, ROM, external memory device, etc. which are general memory.

That is, the geographic information is divided based on latitude and longitude. The partitioned portion is called an area, and a plurality of scale ratio-specific (level-specific; level 1-11) geographic information is stored for each partitioned area.

Referring to the data storage structure of the map storage unit 150 in more detail, the map storage unit 150 is stored in the map in the format of the tree structure as follows, it is convenient to access to the area (mesh) have.

First, the map storage unit 150 is composed of a header unit, an index unit and a data unit.

In the header part, the basic information of the map is specified, and it is possible to know the total number of areas (mesh) or the total number of maps.

The index unit arranges the location of the geographic information by scale ratio (by level), the shape attribute including polygons (planes) and polylines (linears), and the physical location and number of guide information in which maps such as points (characters) are stored. Thus, by reading the index portion, the table of contents for loading the actual map is implemented.

The data section stores actual guide information of the area to be sprayed on the screen, and the guide information includes a cycle including text including a place name, a building name, a facility name, and a road name, a road type property, a road limit property, and a car. It includes road attributes including bow and rotation control, and shape attributes consisting of plane and linear.

Therefore, as shown in FIG. 7 to FIG. 17, the geographic information for each of the plurality of scale ratios (levels; levels 1-11) for each region is stored in the data unit of the map storage unit 150 in a tree structure for each region. As a result, various scale ratio geographic information is stored for each region, so that the scale information can be freely read.

The automation surface control unit 130 determines the number of guide information displayed in the area where the vehicle is located on the screen based on the position information received from the GPS receiver, and compares it with the setting range of the guide information stored in the setting range storage unit. By reducing the scale ratio on the screen where the current vehicle is located by reading the scale information (by level) geographic information for the corresponding area, the role of the automation surface controller will be described in more detail.

The automation surface control unit 130 receives position information including the longitude, speed, altitude, and bearing of the current vehicle received from the GPS satellite from the GPS receiver, and calculates the current direction and current speed of the vehicle based on the received position information. By calculating the current area of the vehicle and the area to be driven in the future, the area to be displayed on the screen is detected.

Next, the geographic information detection method for detecting geographic information corresponding to the detected area in the map storage unit requires a predetermined time for the GPS receiver to receive a GPS signal from a GPS satellite when the GPS terminal is initially driven. The last time the vehicle stored in the map storage is recalled and displayed.

Next, the number of guide information corresponding to the area where the vehicle is currently located on the screen is detected from the detected geographic information. When the number of guide information displayed on the screen and the setting range of the number of guide information stored in the setting range storage unit are compared, and the number of the guide information displayed on the screen is within the setting range, the automation surface controller 130 determines the current scale ratio. The geographic information corresponding to the scale ratio is read from the map storage unit 150.

If the number of guide information displayed on the screen is smaller than the set range, the automatic surface control unit reads geographic information for each scale ratio reduced from the current scale ratio from the map storage unit.

And if the number of the guide information displayed on the screen is larger than the set range, the automatic surface control unit 130 reads the geographic information for each scale ratio enlarged than the current scale ratio from the map storage unit 150, and the geographic information for each scale ratio read Control to display on the display unit 180.

As a result, the scale ratio of the screen is automatically reduced or enlarged due to the automation surface control unit 130 by the above method.

The input unit 170 is an input processor module of the automation surface control unit 130, a touch screen, a keypad, and the like. Generally, the input unit 170 may be configured as a keypad device such as a keyboard for user operation. It is configured to be linked with the display device, such as TFT, El.

Therefore, the user can input the setting range and the priority of the guide information according to the number of guide information displayed on the screen.

The audio output unit 160 includes a speaker that receives a voice guidance control signal and a sound signal and outputs a guide broadcast and a sound corresponding thereto at the same time. Is connected to the voice processor module for transmitting the announcement, the audio output unit 160 is interlocked with the input unit 170 when the input means such as a recording microphone of the GPS terminal 100 to receive the voice, etc. It is configured by.

The display unit 180 is a display device connected to the image processing module of the controller 130 and configured as a screen output unit. The display unit 180 is generally a LCD, a TFT, or an EL, which may be any means for displaying a screen to a user. However, when configured as a touch screen as described above is configured in conjunction with the input unit 170.

In addition, the display unit 180 may be configured to be linked with the audio output unit 160 to simultaneously transmit a guide broadcast and a sound for a screen displayed on the display unit 180.

Referring to the preferred embodiment configured as described above in more detail.

Figure 2a is a flow chart for the automatic surface conversion method of the GPS terminal according to the present invention.

As shown in Figure 2a, the screen conversion method of the GPS terminal,

First, the automation surface control unit receives the position information including the latitude, speed, altitude, and bearing of the current vehicle received by the GPS receiver from the GPS satellite (S100).

Therefore, the GPS satellite information is acquired from the GPS receiver by the step S100.

Next, the automatic surface control unit calculates the current traveling direction and the current speed of the vehicle based on the received position information, predicts the current region of the vehicle and the region to be driven in the future, and detects the region to be displayed on the screen. )

In more detail the step S102 described above,

First, find the distance you can go per second from the latest cumulative average speed, and then calculate the expected distance to go within the next five minutes by substituting the estimated distance you can go per second into the cumulative average speed for the last five minutes.

Next, the upper, lower, left, right, and eight directions (meshes) surrounding the currently running area (mesh) are obtained, and the direction corresponds to the direction of travel using the azimuth property among the GPS information detected in (1). (2) Obtain a mesh list of directions to proceed.

Next, by substituting the estimated driving distance obtained in (1) into the progress direction mesh list obtained in (2), it is determined whether there are more necessary areas (mesh), and if there are excess areas (mesh) corresponding to the progress direction mesh list, Obtain a list of final estimated running meshes (3)

Next, since the area per level area (mesh) is accurately calculated, the final predicted driving mesh obtains an expected area to travel with the corresponding level area (mesh) size.

Therefore, the present method detects the area to be displayed on the screen by predicting the current area of the vehicle and the area to be driven in the future.

Next, the automatic surface control unit detects geographic information for each scale ratio corresponding to the detected area in the map storage unit (S104).

The detection of the initial geographic information may appear at the level used by the user before turning off the GPS terminal, or at the scale ratio that is most suitable for the user. In other words, it is expressed in consideration of what would be convenient for the consumer based on the manufacturer's standard.

Next, the automatic surface controller determines the number of guide information corresponding to the area where the vehicle is currently located on the screen from the detected geographic information for each scale ratio (S106).

In the above method, the number of guide information is determined by reading the index unit corresponding to the scale information geographic information in which the guide information corresponding to the currently located area stored in the map storage unit is stored.

Next, the automatic surface control unit compares the number of guide information displayed on the screen with the setting range of the number of guide information stored in the setting range storage unit (S108).

Next, the automatic surface control unit determines the scale ratio on the screen according to the number of guide information and controls to display the display unit (S110).

In more detail the step S110, as shown in Figure 2b,

If the number of the guide information displayed on the screen is within the setting range, the automation surface controller 130 maintains the current scale ratio, and maps the geographic information for each scale ratio matched with the map storage unit 150. Will be read from)

 If the number of guide information displayed on the screen is smaller than the set range, the automatic surface control unit 130 reads out the geographic information for each scale ratio reduced from the current scale ratio from the map storage unit 150 (S1002).

If the number of the guide information displayed on the screen is larger than the set range, the automatic surface control unit 130 reads out the geographic information for each scale ratio that is larger than the current scale ratio from the map storage unit 150 (S1004).

The read-out geographic information for each scale ratio is controlled to be displayed on the display unit 180 (S1006).

In addition, if the automatic surface control unit 130 further describes how to reduce or enlarge the scale ratio of the screen, the map scale means a certain unit distance (about 1 cm) of the map screen and the actual distance from the surface of the map. An example of the scale when viewed at VGA (640 x 480) resolution is shown in Table 1.

TABLE 1

Screen level Physical level Logical level Screen scale Remarks One One 1-1 1: 80,000m Korean Peninsula 2 1-2 1: 40,000m South Korea 3 2 2-1 1: 10,000m South Korea 1/4 Region 4 2-2 1: 5,000m Special, Metropolitan City 5 3 3-1 1: 2,000m General City, Countywide 6 3-2 1: 1,000m Ward, townwide 7 4 4-1 1: 500m Dong / Myeon area 8 4-2 1: 200 m Autumn area 9 5 5-1 1: 100m Village area 10 5-2 1: 50m Neighborhood 11 5-3 1: 25m House area

The level of the screen includes levels 1-11, and the larger the number, the larger the scale ratio, and the smaller the number, the smaller the scale ratio.

In addition, the scaling ratio can be applied in more detail by having a more detailed logic level at the same physical level.

That is, by reading the geographic information for each scale ratio of the corresponding area in the map storage unit 150 according to the number of guide information, the scale ratio for each region is automatically changed.

For example, if the background is a sea and a mountainous area, the number of guide information to be guided becomes smaller than the set range, so that the scale of the screen is automatically reduced.

That is, when driving at the detailed logic level (5-3, 5-2) in the mountainous area, the map storage unit to display the geographic information by reduced scale ratio for the area displayed on the screen because the number of guidance information displayed on the map is small By reading from and displaying, the scale of the screen is automatically reduced so that the automatic surface conversion to the wide range logic level (5-1) is possible.

That is, if the setting range set by the user in the setting range storage unit 130 is 10-20, for example, and the number of guide information appearing on the screen is 9 or less, the scale ratio of the screen is automatically reduced (reduced scale). Read the non-specific geographic information from the map storage unit 150} If the display information of a wider geographic information, and likewise the number of guide information appearing on the screen is 21 or more, it is difficult for the user to easily identify at a glance, Automatically enlarge the scale ratio of the screen {Read the enlarged scale ratio geographic information from the map storage unit 150} by converging the number of guide information appearing on the screen to 10-20 to optimize the user can easily identify Will provide a screen.

In addition, the setting range storage unit 140 may set the priority of the guide information using the input unit 170.

As an embodiment of this, in the setting step as described above, the user arbitrarily sets the priority among the guide information, and the cycle of the guide information automatically comes out and then disappears automatically.

The above-described method for determining the priority of the guide information by the user is as follows.

If the user can set the environment through the input unit 170 of the terminal and display the number of cycles in one screen according to the ranking, if it is insufficient, the cycle in the next ranking may be displayed.

For example, if a user sets a bank as a priority government office, a 2nd priority, and a convenience store as 3rd priority, and the number of information to be displayed on one screen is 10, subway stations are in the priority order, so the priority is given first. If no other cycles are displayed, only the subway station is displayed, and if there is only one subway station, the remaining nine guides will search for the next priority bank, and if the bank has five, it will display all five (total six) 4 remaining), the remaining period display number is displayed in the next priority by the public office by displaying the priority in the presentation of the guide information.

 Therefore, the user can arbitrarily set the priority of the guide information.

In addition to the above-described explanation of the scale level conversion, as in the above guide information, the map components that automatically switch the map screen as described above may be used for the background (road, building, water system, administrative system, park, green space, railway, etc.). The size can be mentioned.

For example, if the background becomes the sea and the mountainous region, the number of guide information to be guided is reduced, so that the scale of the screen is automatically reduced.

In addition, the method of changing the scale of the screen according to the background also changes as the complexity on the screen changes as the number of guide information changes. That is, the manufacturer decides arbitrarily according to the characteristics of highways, mountains, seas and roads.

 For example, if you think that the guidance information to guide the user according to the manufacturer when the highway is displayed on the screen is important, it can be displayed at a magnified level to display a lot of information by zooming in on the highway around the current location, On the other hand, if the highway is not important because the number of guide information is not important, the scale level can be reduced so that it appears wider around the current location so that the guide information of the surrounding roads and more regions can be displayed on the screen.

An embodiment of the above method will be described with reference to the accompanying drawings.

An embodiment of the priority provides a function of displaying various buildings, POIs, and other surrounding facilities displayed on the screen by adding or excluding them according to the display amount of regions or information as described above. As a specific example, in the case of an urban area, a bank, an agricultural cooperative, a post office, a main building, etc. are displayed except for a part, but all of the above information is displayed in a rural or secluded area even at the same level.

Another embodiment of the above method will be described with reference to the accompanying drawings.

The following shows an example of converting the scale ratio of the screen according to the number and background of the guide information.

As shown in FIG. 3, since the number of guide information is displayed more complicated than the number of guide information set near the Seoul city hall, the scale information of the screen is automatically enlarged as shown in FIG. As shown in FIG. 5, if the number of guide information is less than the set number of guide information, as shown in FIG. 6, the scale ratio on the screen is automatically reduced to show more regions. .

Therefore, in consideration of the number and background of the guide information displayed on the screen, various information such as the name of the road, the building, and the POI are shown to the user centered on the current location of the vehicle received from the GPS. As the amount of information displayed varies, the complexity displayed on the screen varies. That is, some regions may have a large amount of information displayed on the screen, and another region may have a small amount of information displayed. For example, even in the Seoul area, the amount of content displayed is different at the same screen level as in the secluded area where Jongno Street and Forbidden City where complex buildings and roads are located.

In the present invention as described above, by determining the number of data on the screen to calculate the amount displayed based on the position of the vehicle to reduce the scale ratio on the screen to automatically convert to a larger area or to automatically increase the scale ratio on the screen By widening the interval of the displayed object to provide convenience for the user.

Therefore, the user may move to the number of data displayed on the screen determined as a reference, at a level that is automatically enlarged in a complicated area while driving and at a level that is automatically reduced in a quiet area.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art to which the present invention pertains without departing from the gist of the present invention as claimed in the following claims. Until the technical spirit of the present invention will be said.

In the present invention, the method and the apparatus for converting the automatic plane of the GPS terminal according to the number of guide information of the surrounding area of the vehicle is automatically enlarged or reduced the scale ratio of the geographic information displayed on the screen, so that the driver The effect is easy to grasp.

In addition, by allowing the user to arbitrarily set the number of guide information to be provided by the user, the driver can provide the number of guide information according to his environment.

In addition, it is possible to set the priority of the guide information to display the guide information to the user preferentially provided, it is effective to provide the guide information according to the user's taste and business.

1 is a block diagram showing the configuration of a GPS terminal according to the present invention;

Figure 2a is a flow chart for the automatic surface conversion method of the GPS terminal according to the present invention.

Figure 2b is a flow chart for a method for determining the scale ratio according to the number of the guide information automation surface control unit according to the present invention.

3 is a capture diagram showing the guide information of the surroundings for a vehicle running in the vicinity of the city hall according to the present invention.

4 is a capture diagram of a scene in which the scale ratio of FIG. 3 is enlarged.

5 is a capture diagram showing the guide information of the surroundings for a vehicle running in the direction of Singal Reservoir

FIG. 6 is a capture diagram of a scene in which the scale ratio of FIG. 5 is reduced; FIG.

7 to 17 are capture diagrams showing the geographic information for each scale ratio for each region.

♥ Explanation of symbols for main parts of drawing ♥

100: GPS terminal

110: GPS receiver 112: GPS satellite

130: automation surface control unit 140: setting range storage unit

150: map storage unit 160: audio output unit

170: input unit 180: display unit

Claims (7)

In a GPS terminal, A GPS receiver for receiving location information including a latitude, speed, altitude, and azimuth of a current vehicle from a GPS satellite; A map storage unit including guide information to be provided to a user, the geographic information partitioned into a predetermined area, and a plurality of scale ratio (level) geographic information for each area partitioned in the geographic information; A setting range storage unit for storing a setting range for the number of guide information to be displayed on the screen; And Based on the location information received from the GPS receiver, the number of guide information displayed in the area where the vehicle is located on the screen is determined, and compared with the setting range of the guide information stored in the setting range storage unit, and according to the scale ratio corresponding to the area. And an automatic surface control unit for automatically reducing or enlarging the scale ratio of the screen by reading geographic information (by level). The method of claim 1, A setting range of the guide information displayed on the screen by the user in the setting range storage unit; And an input unit configured to set a priority according to the setting range. The method according to claim 1 or 2, The above guide information A cycle of text that includes the name of the area, the name of the building, the name of the facility, and the name of the road, Road attributes, including road classification attributes, road limiting attributes, lane and turn restrictions, Automated surface conversion device of the GPS terminal, characterized in that it comprises a shape attribute consisting of a surface and linear. In the screen conversion method of the GPS terminal, a) the automatic surface control unit receiving the position information including the longitude, latitude, speed, altitude and azimuth of the current vehicle received by the GPS receiver from the GPS satellites; b) calculating the current driving direction and the current speed of the vehicle based on the received position information, predicting the current region of the vehicle and the region to be driven in the future, and detecting an area to be displayed on the screen; c) detecting, by the map storage unit, geographic information for each scale ratio corresponding to the detected area; d) determining, by the automatic surface control unit, the number of guide information corresponding to the area where the vehicle is currently located on the screen from the detected geographic information for each scale ratio; e) comparing the setting range of the number of guide information displayed on the screen with the number of guide information stored in the setting range storage unit; and f) determining the scale ratio on the screen according to the number of guide information and controlling the display to be displayed on the display unit. The method of claim 4, wherein Step d) A step of retrieving a guide information file index of a region corresponding to scale information by a scale ratio from the map storage unit by the automatic surface control unit; And Automated surface conversion method of the GPS terminal, characterized in that the automated surface control unit comprises a small step of grasping the number of the index. The method of claim 4, wherein Step f) If the number of guide information displayed on the screen is within the setting range, the automatic surface control unit maintains the current scale ratio, and reads the geographic information for each scale ratio matched from the map storage unit. If the number of guide information displayed on the screen is smaller than the set range, the automatic control section reads the geographic information for each scale ratio reduced from the current scale ratio from the map storage. If the number of the guide information displayed on the screen is larger than the set range, the automatic surface control method of the GPS terminal, characterized in that for reading the geographic information for each scale ratio enlarged than the current scale ratio from the map storage unit. A recording medium having a computer readable program recorded thereon for performing any one of claims 4 to 6.