JP2012207973A - Guidance information provision system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide information useful for guidance even if network data are not provided at a place immediately before a destination.SOLUTION: Information useful for guiding a user to a travel route can be provided even from a reaching point to a destination by: registering a reaching point disposed on network data to feature data storing the form and location of a building and the like and storing, together with the resultant, information on, for example, the distance between the reaching point and a feature; referring to the starting point and the feature data of a feature designated as the destination to search for a travel route using the reaching point as a virtual destination when searching for a route; presenting the user with a remaining distance based on the distance of the travel route and a movement distance after passing through the reaching point when guiding from the reaching point to the destination; and comparing the straight-line distance between the present position and the destination with the remaining distance, thereby determining whether the travel route is mistaken, and presenting the user with the determination result.

Description

  The present invention relates to a guidance information providing system that provides guidance information for guiding a route to a designated destination.

2. Description of the Related Art Navigation systems that search and guide a route from a specified departure point to a destination by using network data that represents a road network with nodes and links have become widespread. In such a system, network data is not maintained for all roads, so it is not always possible to guide the route to the destination building.
Patent Document 1 discloses a technique for performing a route search using two types of network data when a point away from a link or node is designated as a destination. First, the nearest node is obtained from the destination, and a route search with this node as the end point is performed. From the end point to the destination, a route search is performed using complementary data obtained separately.
Patent Document 2 refers to an area deviated from network data as a specific area, obtains a connection road from the main road where the network data is maintained to the specific area, and searches for a route using the intersection of the main road and the connection road as a guide point. The technology to do is disclosed.

JP 2006-84256 A Japanese Patent No. 3385975 JP-A-8-304094

However, the conventional technique has a problem that an appropriate route cannot always be obtained when a destination away from the link is designated.
FIG. 1 is an explanatory diagram showing a route search example in the prior art.
In the area in the figure, for roads RW1 to RW4, network data including links LW1 to LW4 and nodes N12, N23, N34, and N41 is maintained, and network data is not maintained for road RN. Buildings HA to HJ exist in the area.
Consider a case where a point DE1 in a building HB is designated as a destination for route search. Point DE1 is a point deviated from the network.
According to the technique described in Patent Document 1, a route search is performed with the node N23 closest to the designated point DE1 as the end point. However, since it is necessary to use the road RN to go to the point DE1, a route search with the node N12 or N41 as the end point should be performed. In the route search with the node N23 as the end point, there is a possibility that a route passing through the nodes N12 and N41 and heading for the node N23 may be obtained, which may be an inappropriate route.
According to the technique described in Patent Document 2, for example, a specific area SA is provided as indicated by a broken line in the figure, and a route search is performed with the guide point CP for the specific area SA as an end point. However, in this technique, for example, even when a building HC built so as to enter from the road RW4 as indicated by an arrow AHC is designated as a destination, a route search for the guidance point CP is performed. It is not always possible to obtain an appropriate route.

In addition, as a method for assisting the user to reach the destination when the final guidance point by the route search using the network data is away from the destination, Patent Document 3 discloses that the destination is from the final guidance point. A technique for presenting a direction indicating the ground is disclosed. In addition, a method of calculating and presenting a linear distance between the final guide point and the destination can be considered.
However, the information that can be presented by the prior art is not necessarily sufficient information for the user. For example, in FIG. 1, when guided to the node N23 with the point DE1 as the destination, in order to reach the destination, it is necessary to make a detour to enter the road RN via the node N12 and the point CP. Therefore, even if the direction of the destination and the linear distance are provided, the user does not always reach the destination. As described above, regardless of the distance problem, conventionally, when the distance from the guide point to the destination is far away, it has not been possible to sufficiently provide the user with useful information for reaching the destination. .
In view of such a problem, the present invention guides the user to an appropriate point according to the destination when the guidance point is away from the destination, and is useful for the route from the guidance point to the destination. The purpose is to provide high guidance information.

The guidance information providing system of the present invention is
A guidance information providing system for providing guidance information for guiding a route to a specified destination,
Network data that represents the road network with nodes and links, shape data that represents the position and shape of features with polygons, and points on the network data that can be reached from the features through any road A map database storage unit for storing arrival point data representing an arrival point, and traffic-related information representing an attribute of a route from the feature to the arrival point;
An input unit for inputting a destination;
The arrival point and traffic related information corresponding to the feature corresponding to the destination are acquired, and based on the traffic related information, selection of the arrival point or guidance information regarding the route from the arrival point to the feature is presented. And a route guide unit.

According to the present invention, since the arrival point is stored for the feature, the route search is performed using the arrival point, not the nearest node of the designated destination. Since the arrival point is a point on the main network that can be reached through a road from the feature corresponding to the destination, conversely, a road is passed from the main network to the destination. It becomes a suitable point to head. In addition, since the arrival point is not a point set for each region as in the specific area described in Patent Document 2, it is a point obtained for each feature. Therefore, the arrival point is suitable based on the structure of each feature. Can be obtained. Therefore, by performing a route search using this arrival point, the present invention can search for a suitable route in consideration of the road conditions around the destination, the structure of the destination, and the like.
In the present invention, the traffic related information from the feature to the arrival point is stored. The traffic-related information is information that represents an attribute of a route from a feature to an arrival point, and can be a road, a road width, a signpost, difficulty in passing information, safety information, landscape information, and the like. By using these pieces of information to select an arrival point or provide guidance information, it is possible to realize guidance according to the user's wishes or to inform the user of the attributes of the route from the arrival point to the destination. And can reach the destination.
“Distance” represents the route distance from the arrival point to the feature. For example, when “route” is used as the traffic-related information, the guidance information may be the route itself from the arrival point to the feature, or various information obtained by using the route. By using the “route”, it is possible to provide appropriate guidance information based on the route along the route even when the straight route cannot be reached from the arrival point to the destination. The user can head from the arrival point to the destination without feeling misunderstood or confused as in the case where the straight distance is provided.
As a signpost, the number of buildings along the route, the number of right / left turns, the number of intersections, the coordinates of the right / left turn points, the mark of the right / left turn points, and the like can be used. As the difficulty in passing, it is possible to use the presence or absence of a roof, stairs, slope, ease of freezing, presence or absence of street lamps at night, sunshine conditions, presence or absence of traffic restrictions, and the like. As the safety, for example, a crime occurrence rate can be used. In addition, you may use together landscape information, such as a townscape and scenery.

In the present invention, arrival points need not be stored for all features.
In addition, a route search unit that performs a route search from a departure place designated using network data to a destination may be provided. In this case, the above-mentioned arrival point may be set as a virtual departure point or a virtual destination for a feature designated as a departure point or a destination, and a route search may be performed using them.

In the guidance information providing system of the present invention,
The traffic related information includes a route from the feature to the arrival point,
The route guidance unit may calculate a travel distance from the arrival point to the current position and present the guidance information according to the route and the travel distance. The travel distance may be obtained by sequentially measuring the distance traveled by the distance meter after passing through the arrival point. In addition, when a current position detecting unit for detecting the current position is provided, the moving distance may be obtained by sequentially acquiring the passing points after the arrival point has elapsed and calculating the distance between the passing points. Good.
Guidance information can be presented in various ways. For example, the distance and the travel distance may simply be presented in parallel, or the difference between the distance and the travel distance may be indicated. The guidance information may be presented sequentially after passing through the arrival point, or may be presented only under predetermined conditions. For example, there may be a mode in which information indicating that the current position is near the destination is presented when the difference between the road and the moving distance is within a predetermined value. In this way, since the user can recognize that he / she is near the destination, it is possible to support the arrival at the destination.
The guidance information may be notified under the condition “value obtained by subtracting the moving distance from the road> 0”, or may be notified under the condition “absolute value of difference <place value”. .

In the guidance information providing system of the present invention,
It has a current position detector that detects the current position,
The route guidance unit may calculate a linear distance from the current position to the destination and present guidance information according to the road, the moving distance, and the linear distance.

  For example, a road, a moving distance, and a linear distance may be presented in parallel, or information may be presented when these satisfy a predetermined condition. As an example of the latter, for example, it is determined that the vehicle has deviated from the route when the condition “path-movement distance <linear distance from the destination to the current position” or a condition expressed by an equivalent expression is satisfied. However, it is possible to take a method of presenting information to that effect. “Road-travel distance” is the remaining road when heading to the destination on a regular route. If the current position is on the correct route, the straight line distance from the destination to the current position is It is not possible to become larger than the road.

The guidance information providing system of the present invention is
The traffic related information includes road width information of a route from the feature to the arrival point,
The route guidance unit may present the road width information as guidance information according to the travel distance.
This also makes it possible to determine an error in the route. This is because the user can determine that the route is wrong when the road width information at the current location is different from the presented road width information. In order to support such a determination, a road width at the current location may be presented together, or a result of determining a route error based on this may be presented.

  The present invention does not have to include all of the above-described features, and can be configured by omitting or combining a part as appropriate. In addition to the above, the present invention may be configured as a guide information providing method using a computer, or may be configured as a computer program for causing a computer to provide such guide information. Moreover, you may comprise as a computer-readable recording medium which recorded such a computer program. Recording media include flexible disks, CD-ROMs, magneto-optical disks, IC cards, ROM cartridges, punch cards, printed matter printed with codes such as bar codes, computer internal storage devices (memory such as RAM and ROM), and Various media that can be read by a computer, such as an external storage device, can be used.

It is explanatory drawing which shows the example of guidance in a prior art. It is explanatory drawing which shows the structure of a guidance information provision system. It is explanatory drawing which shows the example of the content of feature data. It is a flowchart of a route guidance process. It is a flowchart of an arrival point setting process. It is explanatory drawing which shows the outline | summary (1) of an error determination process. It is explanatory drawing which shows the outline | summary (2) of an error determination process. It is a flowchart of an error determination process.

A. System configuration:
FIG. 2 is an explanatory diagram showing a configuration of the guidance information providing system. The guidance information providing system is configured by connecting the terminal 100 and the server 200 via a network NE. As the terminal 100, a car navigation device, a personal computer, a mobile phone, a PND (Personal Navigation Device), or the like can be used. The terminal 100 and the server 200 are computers each provided with a CPU, RAM, and ROM. In this embodiment, the system is configured by software by installing a computer program that realizes each function shown in the figure.
In the embodiment, the terminal 100 and the server 200 are configured. However, the illustrated function may be provided as a single unit and may be operated as a stand-alone, or may be configured as a distributed system including a larger number of computers.

The server 200 includes a map database storage unit 210, a transmission / reception unit 201, and a database management unit 202.
The transmission / reception unit 201 communicates with the terminal 100 via the network NE.
The database management unit 202 reads map information requested from the terminal 100 from the map database storage unit 210. The map database storage unit 210 stores feature data 211, character data 212, and network data 213.
The map database storage unit 210 stores polygon data and arrival points of features to be drawn on a map such as roads and buildings. The arrival point is information that gives a temporary guide point to be used in the route search for the feature. Depending on the feature, a plurality of arrival points may be set. The map database storage unit 210 stores information related to traffic from the arrival point to the feature along with the arrival point. The contents of the feature data 211 will be described later.
The character data 212 stores characters displayed on the map.
The network data 213 is data that represents a road network by connection of nodes and links.

In the present embodiment, the feature data 211 stores traffic related information from the arrival point to the feature along with the arrival point, but the arrival point and the traffic related information are stored separately from the feature data 211. May be. That is, the map database storage unit 210 may store the arrival point data and the traffic related information as the arrival point database in parallel with the feature data 211, the character data 212, and the network data 213. In the feature data 211, instead of the data such as the arrival points (1) and (2) shown in FIG. 3, the link to the arrival point and the traffic related information in the arrival point database or the relation is stored. Become.
By adopting such a format, when a common arrival point and traffic-related information are used in a plurality of features, duplication of these data can be avoided and the data capacity can be suppressed.

The terminal 100 includes various functional blocks that operate under the main control unit 101.
The transmission / reception unit 102 communicates with the server 200 via the network NE.
The command input unit 103 inputs instructions from the user such as designation of a starting point and a destination for route search through the operation of the terminal 100.
The sensor input unit 104 inputs various information used for route guidance and the like from the sensor. Examples of information to be input include a current position detected by a GPS (Global Positioning System), a gyro sensor for detecting a moving distance, and an input of a speed sensor. A laser measuring device or the like may be included to detect the current road width.
The map database storage unit 105 stores each data provided from the server 200. The entire map database included in the server 200 may be stored, or only a part necessary for route search and map display may be acquired and stored from the server 200 each time.
The route search unit 107 performs a route search with reference to the map database storage unit 105. The arrival point setting unit 107A sets one to be used for route search among a plurality of arrival points corresponding to the feature designated as the destination. The route search unit 107 and the arrival point setting unit 107A may be provided as functions on the server 200 side. This aspect is useful when the processing capability of the terminal 100 is relatively low.
The route guidance unit 106 guides the searched route based on the map using the map database storage unit 105 and the search result, and various information useful as guidance for the user to reach the destination (hereinafter referred to as “guidance” Information ”(also referred to as“ information ”) is displayed on the display of the terminal 100. The movement distance calculation unit 106 </ b> A calculates a movement distance that is the distance that the user has moved from the arrival point in accordance with the input from the sensor input unit 104. The error determination unit 106B determines whether the user has made a mistake in the route using the calculated moving distance, road width, and the like. This determination result is provided to the user as one piece of guidance information.

B. data structure:
FIG. 3 is an explanatory diagram showing an example of the contents of the feature data. The feature data 211 stores polygon data for drawing features such as buildings and roads, names, shapes, representative points, entrance / exit lines, arrival points, and the like. In the figure, the content of the feature data is shown by taking the building “XX Building” as an example. The name is a name of the feature or an ID unique to the polygon. The shape is a sequence of coordinates indicating the vertices P1, P2,. The representative point is the coordinates of the point CG representing the position of the feature. The entrance / exit line is information for associating a feature with a road. In the example in the figure, the line segment [WP10, WP11] for exiting from the entrance to the road and the line segment [WP20, WP21] from the back door are registered as the entrance / exit lines. WP10 and the like represent coordinate values of points, respectively. The entrance / exit line is set for a feature such as a building or a parking lot, and it is not necessary to set it for all the features.

  The arrival point is a point on the network that can be reached from any end point on the road of the feature entry / exit line via any road. In the example shown in the figure, the links L1 and L2 are set as network data. Therefore, the point CP1 on the link L1 that can be reached from the building entrance / exit line [WP10, WP11] via the dotted line PS1 is the arrival point. be able to. “CP1 → WP11” of the arrival point (1) gives the coordinates of the arrival point CP1 and indicates that it is preferable to go to the entrance / exit line [WP10, WP11] from this arrival point. Further, from the entrance / exit lines [WP20, WP21], the point CP2 on the link L2 that can be reached by following the broken-line path PS2 can be set as the arrival point, so that the information “CP2 → WP21” is set as the arrival point (2). Is remembered. By setting the arrival point in this manner, when “XX building” is set as the destination, it is possible to perform a route search using the arrival points CP1 and CP2 on the road network as the virtual destination.

  For each arrival point, the road, road width, signpost, and difficulty in passing can be used as traffic-related information that can be used to select the arrival point during route search and to guide the route (dashed lines PS1, PS2) from the arrival point to the feature. Information, safety information, landscape information, etc. are stored. “Distance” represents a distance along the route. “Road width” is the minimum road width and the maximum road width of the route. “Road Sign” is information that can be used as a road sign when following the route. For example, the number of buildings along the route, the number of turns left and right, the number of intersections, the coordinates of the right and left turn points, the mark of the right and left turn points, etc. Can do. “Driving difficulty” may be the presence or absence of traffic restrictions including the presence or absence of roofs, stairs, slopes, ease of freezing, presence or absence of street lamps at night, sunshine conditions, time zone restrictions, and the like. “Safety” can be, for example, the incidence of crimes and accidents. The “landscape” can be the state of the town or scenery.

C. Route search process:
The contents of the route search process will be described below. In this embodiment, this processing is executed by the CPU of the terminal 100, but may be executed by the CPU of the server 200.
FIG. 4 is a flowchart of route guidance processing. This process corresponds to the functions of the route guide unit 106 and the route search unit 107.
When the process is started, the CPU inputs designation of a departure place and a destination (step S20). For the designation of the departure point and destination, the user may designate a feature corresponding to the departure point and the destination, and the designation of the departure point may use the current position detected by GPS. Next, the CPU performs arrival point setting processing (step S30). In this process, the CPU refers to the feature data, acquires the arrival point associated with the feature designated as the departure point and the destination, and selects the arrival point used for the route search. Specific processing contents will be described later.
When the arrival point used for the route search is set, the CPU refers to the map data storage unit 105 and performs a route search using the arrival point as a virtual departure point and a virtual destination (step S50). Next, the CPU executes arrival point guidance processing (step S60). The arrival point guidance processing is normal route guidance. Specifically, the CPU presents the route from the searched virtual departure point to the virtual destination to the user, and proceeds according to the current position. This is a process for performing voice guidance such as directions. Since the processing content is well known, detailed description is omitted.
After the user arrives at the arrival point, the CPU provides guidance to the destination by the following procedure.
The CPU acquires the current position of the user from the sensor input unit 104 and displays it on the terminal 100 (step S90). Next, the CPU calculates a moving distance from the arrival point (step S92). The movement distance may be obtained from a movement locus from the position of the arrival point that has arrived to the current position by GPS, or may be calculated based on inputs such as a gyroscope and a speed sensor. Next, the CPU performs an error determination process using the obtained moving distance or the like (step S100). The error determination process is a process in which the CPU determines whether or not the current position of the user is off the route from the arrival point to the destination. Specific processing contents will be described later.
Next, the CPU outputs traffic guidance and traffic-related information to the terminal 100 (step S120).
As a result of the error determination in step S100, the CPU can output the remaining distance from the current position to the destination as traffic guidance when it is assumed that the vehicle is traveling on the correct route. The remaining distance may be obtained by acquiring the road from the arrival point to the destination from the feature data and calculating “the road-the moving distance”. In step S120, the CPU may notify that it is near the destination when the remaining distance is equal to or less than a predetermined value. This notification may be performed only when the remaining distance is a positive value, or may be performed when the absolute value is equal to or less than a predetermined value, including when the remaining distance is a negative value.
As the traffic related information, a signpost stored in the feature data can be used. Safety information and landscape information may be presented together.
The CPU repeatedly executes the above processing until it arrives at the destination (step S122), and ends the route guidance processing.

FIG. 5 is a flowchart of the arrival point setting process. This process corresponds to step S30 in FIG. 4 and corresponds to the function of the arrival point setting unit 107A.
In the arrival point setting process, the CPU reads the arrival point corresponding to the destination from the feature data (step S31). Next, the CPU displays arrival point selection conditions on the terminal 100, and the user inputs the displayed arrival point selection conditions (step S32). In the figure, conditions such as whether the moving means is a car or walking, whether to avoid a slope, whether to select a safe road, whether to give priority to the scenery, etc. are illustrated. In addition to this, traffic difficulty information and safety information stored in the feature data, such as setting to prioritize roads with roofs on rainy days, etc., and considering sunshine conditions to avoid summer sunlight. Various conditions that can be determined using landscape information can be set. The selection condition may be designated by the user each time the route is searched or may be set in advance.
The CPU selects an arrival point that meets the above-described selection conditions (step S33). The state of selection is shown in the figure. Assume that arrival points (1) to (3) are set in the destination feature. When the user selects “car” as the moving means, a route with stairs cannot pass. When it is recorded that “there is a staircase” at the arrival point, the CPU determines that a vehicle, a wheelchair, a bicycle, etc. among the moving means are impassable. Accordingly, the arrival point (1) registered as “with stairs” as the traffic related information is excluded from the candidates. In addition, when the user has specified that the safety is taken into consideration, the CPU compares the safety evaluation values for the remaining candidate arrival points (2) and (3). The safety evaluation value can be obtained, for example, by assigning a score to each item with respect to traffic safety factors such as the presence / absence of lighting and the ease of freezing, and the weighted addition value of the score.
Thus, the arrival point corresponding to the selection condition is set (step S34), and the CPU completes this process. In addition, even if it considers each above-mentioned selection conditions, when any one arrival point cannot be selected, you may make it make a user select.

FIG. 6 is an explanatory diagram showing an outline (1) of the error determination process. The error determination process is a process corresponding to step S100 in FIG. 4 and a process corresponding to the function of the error determination unit 106B.
Since there is no link on the road from the arrival point to the destination, the route is not obtained by route search. The CPU determines whether or not the user has made a mistake in the route from the arrival point to the destination using information such as the route stored in the feature data and information such as the user's moving distance.
Let us consider a case where the user is guided to the arrival point 1 by the result of the route search when heading to the destination CG (the building with hatching) in the figure. In order to go to the destination, it is necessary to follow the paths of arrows A and B. The feature data stores a “path” when the route is followed. However, it is assumed that the user has made a mistake in the point TP to be turned right and has advanced in the direction of arrow C. In this embodiment, the CPU determines that the path is wrong when the following condition is satisfied.
Straight line distance DP from current position PC to destination CG> road-travel distance;
The straight line distance DP changes according to the current position PC of the user. The CPU measures the current position PC at predetermined time intervals, and calculates the linear distance DP to the destination CG each time. However, when traveling along the correct route, the “distance-travel distance” should monotonously decrease toward 0, and this value cannot be smaller than the linear distance DP. Therefore, the CPU can determine that the user has made a wrong route when the above equation holds.
In this embodiment, another determination condition is also used.
As another example, let us consider a case where the user is guided to the arrival point 2. In order to go to the destination, it is necessary to pass through a broken line D. However, it is assumed that the user proceeds as indicated by arrow E and is at the current position PD.
The arrival point 2 stores a range from the minimum road width to the maximum road width with respect to the broken-line route D. The CPU can determine that the route from the arrival point to the destination is wrong when the width of the road RD at the current position PD is out of this range. The road width of the road RD is obtained, for example, from a road polygon of map data corresponding to the current position PD, a method using road width information or lane information registered as an attribute in the road polygon, and laser measurement at the current position PD. Can be obtained by a method such as
Next, specific processing contents will be described.

FIG. 7 is an explanatory diagram showing an outline (2) of the error determination process. The error determination process is a process corresponding to step S100 in FIG. 4 and a process corresponding to the function of the error determination unit 106B.
FIG. 7A shows a data example of road width information from the arrival point to the destination. The road width information is stored according to the travel distance (distance) from the arrival point. In this example, the width of the route from the arrival point to the destination is 4 m when the travel distance is 0 to 100 m, 3 m when 100 to 200 m, 3 m from 200 to 220 m, gradually narrowing from 3 m to 2 m, 2 m when 220 to 300 m, It is 4 m at 300 to 400 m and 5 m at 400 to 500 m.
In the error determination process using the road width, the presence or absence of an error is determined by comparing the road width at each moving point with the road width information shown in FIG. For example, the determination process at a point moved 150 m from the arrival point will be described with reference to the example in the figure. As shown in the drawing, at the point of the travel distance of 150 m, the original road width should be 3 m according to the road width information Wi. On the other hand, when the road width actually estimated or measured at the point where the user is present is the value indicated by the point W1, the route guidance unit 106 determines that the user is within the error Th range from the original road width. Judge that the position is not wrong. On the other hand, when the estimated or measured road width is the value of the point W2, the error exceeds the error Th, and the route guide unit 106 determines that the route is incorrect. The error Th can be arbitrarily set in consideration of the accuracy of estimating or measuring the road width.

The road width information Wi described above is actually stored in a table format as shown in FIGS. 7B and 7C.
FIG. 7B is a table that captures points where the value of the road width information Wi shown in FIG. 7A changes and stores the movement distance and the road width in association with each other. The road width “4, 3” at a travel distance of 100 m indicates that the road width changes from 4 m to 3 m at a point of 100 m. This format has an advantage that the road width information Wi can be expressed accurately with a relatively small amount of data.
FIG. 7C is a table in which road width information Wi is recorded for each predetermined moving distance (50 m in this example). The meaning of the notation of the road width “4, 3” at the 100 m point is the same as in FIG. In this format, when the road width changes in a section shorter than a predetermined distance (50 m), such as 200 m to 220 m, it cannot be accurately expressed. However, since data is stored for each predetermined distance, the movement distance in FIG. 7C can be omitted, and a numerical sequence “4, 4, (4, 3). , 3, 2,... ”Has the advantage that a simple table can be created. Further, if the error determination based on the road width is performed every predetermined distance (50 m), the road width information Wi can be obtained without interpolating the table of FIG. There is also an advantage that can be done.

FIG. 8 is a flowchart of the error determination process. The CPU refers to the feature data corresponding to the destination, and acquires the road L and the road width information corresponding to the route from the destination to the arrival point (step S101). Next, the CPU acquires a moving distance M from the arrival point to the current position (step S102). Further, the CPU estimates the road width W based on the current position (step S103). Any method described in FIG. 6 may be used as the road width estimation method.
Next, the CPU determines a condition of “| road width W−road width information Wi | <Th”, and when the road width W corresponding to the current position does not satisfy this condition, the user can travel from the arrival point to the destination. It is determined that the route is traveling in error (step S104). This determination corresponds to the error determination process described with reference to FIG. Instead of the determination process in step S104, a condition of “minimum road width ≦ road width W ≦ maximum road width” may be used. This is because if the current road width W exceeds the range determined by the minimum and maximum road widths from the arrival point to the destination, it can be determined that the route is wrong. In this mode, as shown in FIG. 7A, it is not necessary to store the road width according to the travel distance, and it is only necessary to store the minimum value and the maximum value of the road width. There is an advantage that can be simplified.
Further, when the above condition is satisfied, the CPU calculates a straight line distance DP from the destination to the current position (step S105), and determines a condition of “straight line distance DP> road L−movement distance M”. . When this condition is satisfied, the CPU determines that the user is traveling in error on the route from the arrival point to the destination (step S106).
If the CPU determines in step S104 or step S106 that the route is traveling in error, the CPU notifies the user of an error (step S107) and completes the error determination process. For the notification of the error, a warning can be displayed on the screen of the terminal 100 or a voice output can be used.
If the user does not have the wrong route, the CPU presents guidance information (step S108). This guidance information is preferably content according to the road L and the movement distance M. For example, the road L and the movement distance M may be displayed in parallel, or the remaining roads obtained by “the road L−the movement distance M” may be displayed.
Further, when the remaining road becomes smaller than a predetermined value, it may be notified that the destination is close like “near destination”.

D. Effects and variations:
According to the guidance information providing system of the embodiment described above, it is possible to present useful guidance information such as a route for the route from the arrival point to the destination.
In addition, by making an error determination (FIGS. 6 and 7), it is possible to notify the user that the route is incorrect, and the convenience of route guidance can be improved.

The present invention does not necessarily have all the functions of the above-described embodiments, and only a part may be realized. Moreover, you may provide an additional function in the content mentioned above.
Needless to say, the present invention is not limited to the above-described embodiments, and various configurations can be adopted without departing from the spirit of the present invention. For example, a part configured in hardware in the embodiment can be configured in software and vice versa.

  The present invention can be used to provide information useful for guiding an area where network data is not maintained.

DESCRIPTION OF SYMBOLS 100 ... Terminal 101 ... Main control part 102 ... Transmission / reception part 103 ... Command input part 104 ... Sensor input part 105 ... Map database memory | storage part 106 ... Route guidance part 106A ... Movement distance calculation part 106B ... Error determination part 107 ... Route search part 107A ... arrival point setting unit 200 ... server 201 ... transmission / reception unit 202 ... database management unit 210 ... map database storage unit 211 ... feature data 212 ... character data 213 ... network data

Claims (4)

A guidance information providing system for providing guidance information for guiding a route to a specified destination,
Network data that represents the road network with nodes and links, shape data that represents the position and shape of features with polygons, and points on the network data that can be reached from the features through any road A map database storage unit for storing arrival point data representing an arrival point, and traffic-related information representing an attribute of a route from the feature to the arrival point;
An input unit for inputting a destination;
The arrival point and traffic related information corresponding to the feature corresponding to the destination are acquired, and based on the traffic related information, selection of the arrival point or guidance information regarding the route from the arrival point to the feature is presented. A guidance information providing system comprising a route guidance unit. A guide information providing system according to claim 1,
The traffic related information includes a route from the feature to the arrival point,
The route guidance unit calculates a travel distance from the arrival point to the current position, and presents the guide information according to the route and the travel distance. A guide information providing system according to claim 2,
It has a current position detector that detects the current position,
The route guidance unit calculates a linear distance from the current position to a destination, and provides guidance information according to the road, the moving distance, and the linear distance. A guide information providing system according to claim 2,
The traffic related information includes road width information of a route from the feature to the arrival point,
The route guidance unit is a guidance information providing system that presents the road width information as guidance information according to the travel distance.

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