WO2013145646A1 - 情報処理システム - Google Patents
情報処理システム Download PDFInfo
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- WO2013145646A1 WO2013145646A1 PCT/JP2013/001891 JP2013001891W WO2013145646A1 WO 2013145646 A1 WO2013145646 A1 WO 2013145646A1 JP 2013001891 W JP2013001891 W JP 2013001891W WO 2013145646 A1 WO2013145646 A1 WO 2013145646A1
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- area data
- data
- read
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- road
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
- G01C21/3863—Structures of map data
- G01C21/387—Organisation of map data, e.g. version management or database structures
- G01C21/3878—Hierarchical structures, e.g. layering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
- G01C21/3804—Creation or updating of map data
- G01C21/3807—Creation or updating of map data characterised by the type of data
- G01C21/3815—Road data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
- G01C21/3804—Creation or updating of map data
- G01C21/3859—Differential updating map data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
- G01C21/3885—Transmission of map data to client devices; Reception of map data by client devices
- G01C21/3889—Transmission of selected map data, e.g. depending on route
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/38—Electronic maps specially adapted for navigation; Updating thereof
- G01C21/3885—Transmission of map data to client devices; Reception of map data by client devices
- G01C21/3896—Transmission of map data from central databases
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
- G09B29/003—Maps
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
- G09B29/10—Map spot or coordinate position indicators; Map reading aids
- G09B29/106—Map spot or coordinate position indicators; Map reading aids using electronic means
Definitions
- This disclosure relates to an information processing system that executes processing using map data.
- An information processing system that executes processing using map data includes a car navigation device that displays a road map for a user, searches for a route to a destination, and guides a route to a destination.
- Electronic devices such as smartphones are known. Further, as this type of electronic device, one that updates map data stored in its own device based on data received from a distribution center is known.
- map data map data having a hierarchical structure having data of a plurality of layers is known, and the lowest layer data includes highways, national roads, main local roads, prefectural roads, narrow streets, and the like. It has detailed road network information, and upper layer data is known to have information on only the main road network (see Patent Document 1).
- the map data having the information of the road network such as the expressway and the national road as described above in the data of multiple layers, it is possible to easily read out the detailed road and the main road.
- the process for updating the map data is complicated. That is, when a change occurs on a road described in a plurality of layers, the data of each layer must be corrected.
- difference map data for updating map data from a distribution center to a user-owned electronic device for example, a difference map for the lowermost layer data having detailed road network information in order to reduce the traffic. It is conceivable that only the data is transmitted from the distribution center to the electronic device. In this case, the change in the road network is identified from the difference map data for the lowest layer data, and this is used to update the upper layer data. It is necessary to convert the information into the above information, which adversely affects the processing load and processing time related to the update.
- This disclosure is intended to provide a technology capable of reading out necessary information from map data at a high speed while suppressing duplication of road networks in a plurality of layers.
- An information processing system made to achieve the above object includes a map storage device that stores road map data in which a road network in a specific area is hierarchically expressed by a road case, and a map data storage device And a temporary memory for temporarily storing data read from the map storage device.
- the road map data provided in the map storage device is a hierarchical representation of the road network of a specific area by road case by providing layer data representing a road network of a specific road case in a specific area for each road case.
- a road case can be defined such that a type of road suitable for long-distance movement such as an expressway is ranked higher.
- each of the layer data is configured to include one or a plurality of area data, and at least layer data other than the highest road case includes area data for each section obtained by dividing the specific area. Made up.
- the area data represents the road network of the corresponding road case in the corresponding section.
- a group of area data is sequentially arranged and stored for each road case in a continuous address space.
- a group of area data is arranged according to the geographical arrangement of the sections for each road case.
- the temporary memory is configured as a storage device that can be accessed at a higher speed than the map storage device, and temporarily stores a group of area data read from the map storage device.
- the read control unit reads each area data requested (designated) by the read request from one of the map storage device and the temporary memory and provides it to the read request source. Specifically, among the group of area data requested by the read request, the group of area data stored in the temporary memory is read from the temporary memory, and the group of area data not stored in the temporary memory is stored in the map storage device. Read from.
- the corresponding group of area data is located between these area data on the address space.
- a single or a plurality of groups are read together, including area data not requested by the read request.
- a group of area data read from the map storage device is temporarily stored in a temporary memory.
- the road map data is hierarchically expressed by the road case, so that the redundant description of the road network in multiple layers can be suppressed and the reflection of the new road network to the road map data can be efficiently performed. To be able to do it automatically.
- the relationship between the layer data is the relationship between the map data representing a detailed road network such as conventional map data and the map data of the main road from which some road case information is omitted. Therefore, when a detailed map is displayed for the user, it is necessary to read a plurality of layer data, and the number of times of reading tends to increase.
- a plurality of area data requested by a read request at a position distant from the address space are The area data that is not requested by the read request located in the area is read out collectively.
- the number of times of reading area data from the map data storage device can be reduced as compared with the case of individually reading each area data not stored in the temporary storage device requested by the read request. It is possible to suppress the processing load and processing time related to reading.
- area data not requested by a read request is also read, but the road map confirms the surrounding road and the route to the destination while the user moves. Often used to For this reason, there is a high possibility that the area data around the section corresponding to the area data requested by the read request is required as the user moves or the route search / guidance process proceeds.
- the area data group requested by the read request can be read at high speed.
- a group of area data can be stored so that the road cases are arranged in order from the highest or lowest area data.
- the reading control unit reads a group of area data not stored in the temporary storage device from the map data storage device, the reading control unit is an area data whose road case is other than the lowest in the group of corresponding area data. Address from the start point address of the area data whose head position is in the space to the end point address of the area data whose road space is other than the lowest in the group of the corresponding area data and whose position in the address space is the last one
- the area data included at least in the range can be read collectively.
- the frequency with which the area data is requested tends to be higher when the road case is higher than the lower case, so if the area data with the higher road case is read together as described above, Area data that is not requested by the read request stored in the temporary storage device can be effectively used as the user moves or the route search / guidance process progresses, and the number of reads from the map data storage device is suppressed and read.
- the area data group requested by the request can be read at high speed.
- the reading control unit when the reading control unit reads a group of area data not stored in the temporary storage device from the map data storage device, the start point of the area data whose position in the address space is the first in the corresponding group of area data Area data included in the address range from the address to the end point address of the last area data in the address space in the group of corresponding area data can be read in a lump.
- a group of area data can be arranged in order from the area data having the highest road rating.
- the read control unit has a road rating of the group of corresponding area data. From the start address of the area data that is the most significant area data and whose position in the address space is the top address data, the area data that has the lowest road case in the group of the corresponding area data and whose position in the address space is the end A group of area data included in the address range up to the end point address of the area data can be read from the map data storage device in a lump.
- a group of area data not stored in the temporary storage device can be read all at once, and the storage capacity of the temporary storage device may need to be increased.
- the number of readings can be suppressed, and the processing time and processing load related to reading can be efficiently suppressed.
- the information processing system includes a unit that discards, from the temporary storage device, a group of area data whose read frequency is less than a predetermined level among the group of area data temporarily stored in the temporary storage device. Then, by using a different level for each road case, it is possible to provide a discarding unit that preferentially discards the area data having a lower road case. According to the information processing system configured as described above, it is possible to temporarily store area data with high necessity in the temporary storage device by effectively using the temporary storage device having a limited storage capacity.
- the area data with the higher road case represents the road network in the larger compartment
- the area data with the lower road case has the road network in the smaller compartment.
- the area data can be configured to represent That is, the layer data for each road case can be configured to include area data for each section that has a smaller road data with lower road case.
- the road case can be determined in two stages, upper and lower, three stages, upper, middle and lower, and more than that.
- the road map data that stores the layer data separately for each road case, it is easy to update the map.
- the area data can be read at a high speed in response to a read request by the above-described method.
- the read control unit executes at least one of map display processing for displaying a road map, route search processing for searching for a route to the destination, and route guidance processing for guiding the route to the destination.
- map display processing for displaying a road map
- route search processing for searching for a route to the destination
- route guidance processing for guiding the route to the destination.
- the navigation device 10 of this embodiment is an example of an information processing system of the embodiment.
- An in-vehicle navigation device that executes processing using road map data (hereinafter simply referred to as “map data”), as shown in FIG. 1, a position detection unit 11, a storage unit 13, and a control unit 15.
- the position detection unit 11 detects the current position of the vehicle on which the navigation device 10 is mounted, and has a configuration including a known gyroscope, a distance sensor, a GPS receiver, and the like, for example.
- the storage unit 13 is configured by a hard disk device, a flash memory, or the like, and stores initial map data installed at the beginning of shipment of the navigation device 10 as map data.
- the received difference map data is stored.
- the difference map data is map data representing a new road network based on a difference from the road network based on the road network indicated by the initial map data, and represents a change in the road network from the initial map data.
- Difference information based on the difference map data included in the broadcast signal transmitted from the broadcast station is added to the difference map data stored in the storage unit 13.
- the storage unit 13 stores a program group used by the control unit 15 and other various data.
- control unit 15 is constituted by a microcomputer, and includes a calculation unit 15A and a RAM 15B as shown in FIG.
- the calculation unit 15A executes various processes based on the program stored in the storage unit 13.
- the calculation unit 15A displays the road map around the current position detected by the position detection unit 11 or the area around the area requested (designated) by the user through the input unit 17 according to the program at a scale designated by the user.
- the calculation unit 15A reads the data specified by the read request from the initial map data and the difference map data.
- the map provision processing (details will be described later) is provided to provide the read request source to
- the input unit 17 includes a touch panel provided on the screen of the display unit 18 and various key switches provided in the vicinity thereof, and functions as a user interface for receiving a user's operation on the navigation device 10.
- the display unit 18 includes a liquid crystal display, a speaker, and the like, displays various images on the screen, and outputs sound together.
- the receiving unit 19 has a function capable of receiving the broadcast signal from a broadcast station that distributes the difference map data using a digital broadcast signal.
- the initial map data has map data for each section obtained by dividing the map recording area into a plurality of sections.
- this section is expressed as “main section”, and map data for each main section included in the initial map data is referred to as main section data.
- a group of these main section data is configured as a data group in which corresponding main section data is arranged in an order according to the geographical arrangement of the sections.
- the K-th main section data in the arrangement order is expressed as K-th main section data.
- the main section data is configured as map data obtained by hierarchically expressing the road network in the corresponding main section by the road case.
- the main division data includes the third layer data representing the road network with the higher road rank in the corresponding main division, the second layer data representing the road network with the middle road rank, and the lower rank of the road case. It consists of the first layer data representing the road network.
- Examples of road types include highways, national roads, prefectural roads, ordinary roads, and narrow streets. Road types are classified as long-distance travel, medium-distance travel, and short-distance travel. Can be classified into any of the three categories.
- highways and national roads can be defined as high-order roads, prefectural roads as medium-level roads, general roads and narrow streets as low-grade roads. However, it is arbitrary by the designer which kind of road is classified as upper, middle or lower.
- the main partition data is configured as a data group in which the third layer data, the second layer data, and the first layer data are arranged in order from the top.
- the second layer data includes area data for each section (hereinafter referred to as “medium section”) obtained by dividing the corresponding main section into a plurality of parts.
- the area data for each middle section is configured as map data representing the road network of the middle road grade in the corresponding middle section.
- the main section is divided into four parts by dividing the main section into four parts in the vertical and horizontal directions to determine the middle part.
- the main section corresponds to the section surrounded by the thick line in FIG. 4, and the middle section corresponds to each square of the second layer in FIG. Therefore, the second layer data is composed of 16 area data.
- a group of these area data (second layer data) is configured as a data group in which the area data of the corresponding middle sections are arranged in the order according to the geographical arrangement of the middle sections.
- the area data of the K-th middle section in the arrangement order is expressed as the K-th middle section data.
- the first layer data is composed of area data for each partition (hereinafter referred to as “small partition”) obtained by dividing the corresponding main partition into a plurality of partition sizes smaller than the second layer data.
- the area data for each subdivision is configured as map data representing the road network of the lower road grade in the corresponding subdivision.
- the main section is divided into 256 parts by dividing the main part into 16 parts vertically and horizontally, thereby defining the small parts.
- the small sections correspond to the cells in the first layer in FIG.
- the first layer data is composed of 256 area data.
- a group of these area data (first layer data) is configured as a data group in which area data of corresponding subsections are arranged in an order according to the geographical arrangement of the subsections.
- the area data of the K-th subsection with the arrangement order is expressed as the K-th subsection data.
- the third layer data is also expressed as area data of the third layer.
- the layer data (third layer data, second layer data, and first layer data) for each road case in this embodiment is an area for each section that is smaller as the layer data is lower in the road case as shown in FIG.
- the main partition data has a configuration in which a group of area data having different partition sizes for each road case is arranged in the order corresponding to the order in which the roads are arranged.
- FIG. 6 shows the arrangement order of area data (second layer area data) included in the second layer data and the arrangement order of area data (first layer area data) included in the first layer data.
- each square is understood as representing a geographical arrangement relationship, and each square is understood as representing an arrangement rank K.
- the area surrounded by the bold line shown on the left in FIG. 6 is the area corresponding to the main section, and each square in this area corresponds to the middle section, and the section whose number in the square is K is This represents the K-th middle section in the second layer data (section corresponding to the K-th middle section data).
- the area surrounded by the thick line (solid line) shown on the right in FIG. 6 is an area corresponding to the main section, and the section whose number in the square is K is the Kth small section (first number) in the first layer data.
- K) represents a section corresponding to the small section data.
- each layer data a group of area data is arranged in accordance with the geographical arrangement so that the arrangement order of the area data of adjacent sections is close.
- Each area data constituting the main partition data is arranged in a continuous address space in the storage unit 13 in this order, and an address range is specified through a driver (hardware driver or software driver) of the storage unit 13.
- a driver hardware driver or software driver
- the area data represents the connection relationship of each road constituting the road network of the corresponding road class of the corresponding section by link connection, and has a link record for each link as shown in FIG.
- the link record includes detailed information about the link indicating the link length, connection relationship with other links, and the like, and reference information to the coordinate record.
- a group of coordinate records represents the coordinates of a node (a connection point with another link) or a point in the link for each link indicated by the group of link records. That is, each of the coordinate records is configured as a record representing the coordinates of one of these points and the type of the point (node or coordinate holding point).
- the reference information to the coordinate record that the link record has is configured as information for referring to a coordinate record group representing the coordinates of the link and the end point corresponding to the link record.
- this area data has a segment record for each segment having a link string as a unit at least at a crossing with a link other than a road case that has a road case other than a lower rank. Therefore, the segment record is not provided for the area data having a lower road case.
- This segment record has reference information to the link record corresponding to each link constituting the corresponding segment.
- the segment replaces the link of the main road expressed in a layer higher than the lowest layer in the conventional map data.
- Conventional map data can be handled efficiently in response to changes in the scale of the map to be displayed, such as layer data representing a detailed road network and layer data representing a main road network with a road case thinned out. It was configured with map data.
- layer data for each road case is provided without adopting a conventional map data configuration in which main road information is duplicated in a plurality of layers. For this reason, the concept of segment is used to express the link of the upper-level main roads in the conventional map data in a format that refers to the link record.
- the area data has a route record for each link row belonging to the same route.
- the “route” referred to here is a concept larger than the segment, and is defined by, for example, a link string of the same road name and the same road number connected to one line in the corresponding section.
- Each route record includes route attribute information including information indicating whether the corresponding route is a toll road or a non-toll road, reference information to a segment record or link record, and reference information to a coordinate record.
- Reference information to the segment record or link record included in the route record refers to the segment record corresponding to each segment constituting this route when the link sequence constituting the corresponding route has the concept of segment.
- the link sequence constituting this route does not have the concept of segment, it is constituted as information for referring to the link record corresponding to each link constituting this route.
- the reference information to the coordinate record included in the route record is configured as information for referring to a coordinate record group representing the coordinates of the inside of the route and the end point corresponding to the route record.
- the area data included in the difference map data is configured as information representing the amount of change in the road from the initial map data in the corresponding section.
- the area data of the differential map data has a configuration in which a command group indicating a correction location and correction content for the initial map data (or the old version of the differential map data) is described.
- the calculation unit 15A executes this map provision process.
- each section is expressed as S110, for example.
- each section can be divided into a plurality of subsections, while a plurality of secasses can be combined into one section.
- each section configured in this manner can be referred to as a module, device, or means.
- each of the above sections or a combination thereof is related not only to (i) a software section combined with a hardware section (eg, a computer) but also (ii) a hardware section. It can be realized with or without the function of the device.
- the hardware section can be configured inside the microcomputer.
- the calculation unit 15A reads the area data of each section to be read designated by the read request (hereinafter referred to as “designated section”) from the initial map data. At this time, a group of area data of the designated section is read by executing a read control process described later (S110). Depending on the read request, the main section, the middle section, the small section, and an area data group of these combinations are designated as the reading target.
- the area data of the main section / medium section / small section is specified by the read request, it is interpreted that the area data of the corresponding section of the third layer / second layer / first layer is requested, and read control is performed. Execute the process.
- the calculation unit 15A then reads a group of area data in the same section as S110 from the difference map data. Also at this time, a read control process to be described later can be executed (S120).
- the calculation unit 15A merges a group of area data of the designated section read in S110 and S120 for each section, and generates combined map data for each section (S130). That is, in S130, for each section, the area data read from the initial map data and the area data of the same section read from the difference map data are combined to reflect the information on the new road network for the section. Generate combined map data as Thereafter, the calculation unit 15A provides the generated combined map data for each section to the read request source (S140), and ends the map providing process.
- map data (hereinafter referred to as "integrated map data") is generated by combining the combined map data for each layer (road case) in the overlapping region, and in S140, the connection between the layers is thus performed.
- integrated map data obtained by integrating the road network for each road case can be provided to the read request source.
- the read request source is caused to specify a partition size (main block, medium block, small block) for generating the integrated map data in response to the read request. Accordingly, the integrated map data may be generated with the partition size specified by the read request.
- the combined map data of this small section (first layer) and the small section are set for each small section designated for reading by a read request.
- the middle section is designated as the unit for generating the integrated map data
- the combined map data of this middle section (second layer) and the middle section for each middle section designated for reading by the read request can be generated by combining the combined map data of the main section (third layer) surrounding the area.
- the arithmetic unit 15A reads out from the cache area the area data group temporarily stored in the cache area of the RAM 15B among the area data group to be read designated by the read request (S210). .
- the area data group stored in the cache area corresponds to the area data group read from the storage unit 13 and cached by the previous read control process.
- garbage collection is executed (S220).
- Discard (delete) an area data group with a low read frequency from the cache area of the RAM 15B.
- S220 the area data group that has not been read Z times or more in the past S210 including immediately before can be discarded from the cache area.
- an individual value may be determined for each layer (road case).
- the area data having a higher road rating is frequently read out because it is required regardless of the scale size in the map display process.
- the route search processing when searching for a route, there are many cases of moving for a long distance, and there is a high frequency that area data having a higher road rating is required. That is, area data with a higher road case tends to be read more frequently than area data with a lower road case.
- the arithmetic unit 15A next reads the area data to be read designated by the read request. It is determined whether or not all have been read (S230). In S230 immediately after the execution of S220, it is determined whether or not all of the reading targets have been read from the cache area of the RAM 15B. If it is determined that all area data to be read has been read (Yes in S230), the read control process is terminated.
- the calculation unit 15A executes a read start address setting process shown in FIG. 11 (S240).
- the calculation unit 15A determines whether or not the uppermost layer data (the road case is the highest) in the area data group that has not been read is the third layer area data. to decide. In other words, it is determined whether or not the third layer area data (third layer data) is included in the group of area data that has not been read out of the area data group designated by the read request (S241). ).
- the calculation unit 15A determines the start address of the third layer area data that has not been read, in other words, the first data that has not been read.
- the start address of the area of the storage unit 13 storing the three layers of area data is set as the read start address (S242), and the read start address setting process is terminated.
- S242 the read start address setting process is terminated.
- a plurality of third layer area data is not designated as a read target by a single read request, and the second layer and first area data are designated as read targets. Only area data in the same main section corresponding to the third layer area data is specified.
- the arithmetic unit 15A proceeds to S244, and determines whether or not the uppermost layer area data that has not been read is the second layer area data. In other words, whether or not the third layer area data is included in the group of area data that is not read out of the area data group specified by the read request includes the second layer area data. to decide.
- the start point address in the storage unit 13 of the second layer area data that has not been read is set as the read start address (S245).
- the read start address setting process is terminated.
- the start address of the area data whose storage position is the head in the address space of the storage unit 13 among the plurality of area data is used as the read start address.
- the read start address is set to the start point address of the area data having the smallest arrangement order in the second layer data among the group of second layer area data that has not been read.
- the arithmetic unit 15A proceeds to S247 and regards the top layer area data that has not been read as the first layer area data. Then, after setting the start point address of the area data having the first storage position in the address space of the storage unit 13 in the group of the first layer area data that has not been read out to the read start address, the read start address The setting process ends. As a result, the read start address is set to the start point address of the area data having the smallest arrangement order in the first layer data among the group of the first layer area data that has not been read.
- the arithmetic unit 15A executes the reading end address setting process shown in FIG.
- the calculation unit 15A determines whether or not the lowermost area data (the road grade is the lowest) in the area data group that has not been read is the first layer area data. to decide. In other words, it is determined whether the area data of the first layer is included in the group of area data that has not been read out of the area data group designated by the read request (S251). If it is determined that the first layer area data is included (Yes in S251), the area data with the last storage position in the address space of the storage unit 13 in the group of first layer area data that has not been read out.
- the read end address is stored in the area of the storage unit 13 in which the last area data in the order of arrangement in the first layer data is stored in the group of the first layer area data that has not been read out. Set to the end address.
- the calculation unit 15A proceeds to S254, and determines whether or not the lowest layer area data that has not been read is the second layer area data. In other words, it is determined whether or not the second layer area data is included in the group of area data that has not been read.
- the end point address of the area data with the last storage position in the storage unit 13 in the group of second layer area data that has not been read is obtained. Then, after the read end address is set (S255), the read end address setting process is terminated.
- the arithmetic unit 15A proceeds to S257, and determines that the lowermost area data that has not been read is the third layer area data. Then, the end point address of the third layer area data that has not been read is set as the read end address. Thereafter, the reading end address setting process is terminated.
- the calculation unit 15A proceeds to S260 (see FIG. 10), reads the area data included in the address range from the set read start address to the read end address, and further reads This is registered in the cache area of the RAM 15B, and the read area data is stored in the RAM 15B as a cache.
- S260 by issuing a read command designating an address range from the read start address to the read end address to the storage unit 13, the area data within the address range is read from the storage unit 13 at a time. be able to.
- the corresponding area data group is set between these area data in the address space.
- the data including the area data not specified by the read request located at the same time is read out in a lump and cached in the RAM 15B. Since the RAM 15B is configured by hardware having a higher access speed than the storage unit 13, the area data cached in the RAM 15B can be read at high speed while being cached.
- the arithmetic unit 15A proceeds to S230, determines again whether all the area data to be read designated by the read request has been read, and determines that all the area data to be read has been read, the read control The process ends.
- S230 since a read request is made in units of main partitions, in S230 after execution of the processing of S260, all the area data to be read designated by the read request is being read. Make a positive decision.
- the processing loop of S230 to S260 is repeatedly executed for each main partition, so that the above-described processing is performed for each main partition.
- the address range is designated by a technique, and the third layer, second layer, and first layer area data corresponding to each partition in the main partition may be read at once.
- a read request for designating the area data of the main section (1,2) and the area data of the middle sections (1,6) to (2,7) shown in FIG. Suppose that is issued.
- the expressions (X1, Y1) to (X2, Y2) indicate a rectangular area where X1 ⁇ X ⁇ X2 and Y1 ⁇ Y ⁇ Y2, and the sections (X1, Y1) to (X2, Y2)
- the expression represents a section group in the rectangular area.
- the middle sections that fall within the main section (1, 2) are the middle sections (1, 5) to (4, 8).
- the third layer data in the section data, and the second layer area data corresponding to the middle sections (1, 5) to (4, 6) and the middle sections (1, 7) to (2, 7) are stored in the storage unit 13. Are collectively read.
- the area data of the middle section (1, 5) to (4, 6) and the middle section (1, 7) to (2, 7) are the third layer in the main section data corresponding to the main section (1, 2). It corresponds to the first middle section data to the tenth middle section data following the data. That is, according to this example, the data from the third layer data to the tenth middle partition data in the main partition data corresponding to the main partition (1, 2) are collectively read from the storage unit 13.
- the area data of the main section (1, 2) and the area data of the middle sections (3, 6) to (4, 7) shown in bold lines in FIG. Consider a case where a designated read request is issued.
- the cache area of the RAM 15B includes the third layer area data of the main partition (1, 2) and the second layer area data of the middle partitions (3, 6) to (4, 6). Therefore, depending on the read control process, these area data are read from the cache area, and the remaining area data of the middle sections (3, 7) to (4, 7) (FIG. 14B, bold lines). (Inside) is read from the storage unit 13 at a time.
- the area data of the middle sections (3, 7) to (4, 7) correspond to the thirteenth middle section data to the fourteenth middle section data in the main section data corresponding to the main section (1, 2). That is, according to this example, from the storage unit 13, the thirteenth middle section data and the fourteenth middle section data in the main section data corresponding to the main section (1, 2) are collectively read.
- the area data of the middle sections (5, 5) to (8, 6) and the middle sections (5, 7) to (6, 7) are the main data in the main section data corresponding to the main section (2, 2). It corresponds to the first middle section data to the tenth middle section data following the three-layer data.
- the small sections that fit in the middle section (3, 7) are the small sections (9, 25) to (12, 28).
- the first layer area data whose arrangement order is earlier than the area data of (9, 25) is collectively read from the storage unit 13.
- the area data of the middle sections (1, 5) to (4, 8) are from the first middle section data to the sixteenth middle section data following the third layer data in the main section data corresponding to the main section (1, 2).
- the area data of the small sections (9, 25) to (12, 28) corresponding to (all of the medium section data) is the 193rd small section data in the main section data corresponding to the main section (1, 2).
- the first layer area data corresponding to the 208th subdivision data and the arrangement order before the first layer area data of the subdivision (9, 25) is in the main division data corresponding to the main division (1, 2).
- the area data of the main section (1, 2), the middle section (4, 7), and the small sections (13, 25) to (16) shown in bold lines in FIG. , 28) Consider a case where a read request for designating area data as a read target is issued.
- the third layer area data of the main partition (1, 2) and the second layer area data of the middle partition (4, 7) exist in the cache area of the RAM 15B, the read control process Depending on the area, these area data are read from the cache area, and the remaining area data of the small sections (13, 25) to (16, 28) (inside the bold lines in FIG. 16 (b)) are stored in the storage unit 13. Are collectively read.
- the area data of the small sections (13, 25) to (16, 28) correspond to the 209th small section data to the 224th small section data in the main section data corresponding to the main section (1, 2). That is, according to this example, only the 224th small section data is read from the storage section 13 from the 209th small section data in the main partition data corresponding to the main section (1, 2).
- the main partition data of the main partition (1, 2) the first layer area data whose arrangement order is earlier than the area data of the small partition (13, 25) is collectively read from the storage unit 13.
- the area data of the small sections (13, 25) to (16, 27) and the small sections (13, 28) to (14, 28) are the 209th small data in the main section data corresponding to the main section (1, 2). It corresponds to the 222nd sub-compartment data from the compartment data.
- the area data of the main section (1, 2), the middle section (4, 7), and the small sections (13, 26) to (14) shown in bold lines in FIG. , 27) Consider a case where a read request for designating area data as a read target is issued. In this case, the area data of the main partition (1, 2), the middle partition (4, 7), and all the area data of the small partitions (13, 26) to (14, 27) are stored in the cache area of the RAM 15B. Therefore, depending on the read control process, all of the area data specified by the read request is read from the cache area.
- the read control process Depending on the case, these area data are read out from the cache area, and the area data of the small partitions (11, 26) to (12, 27) and the small partitions (9, 27) to (10, 28) (FIG. 18 (c) ) (In bold line) is read from the storage unit 13 at once.
- the area data of the small section (11, 26) corresponds to the 199th small section data in the main section data corresponding to the main section (1, 2)
- the area data of the small section (12, 27) is This corresponds to the 206th subsection data. That is, according to this example, only the 206th small section data is read from the storage unit 13 from the 199th small section data in the main section data corresponding to the main section (1, 2).
- the area data specified by the read request is read from one of the cache area of the storage unit 13 and the RAM 15B, and the read request source To provide. Specifically, among the group of area data designated by the read request, a group of area data stored in the cache area of the RAM 15B that can be accessed at high speed is read from this cache area and stored in the cache area of the RAM 15B. A group of missing area data is read from the storage unit 13 which requires more time to read than the RAM 15B.
- the group of corresponding area data is stored in the address space in order to reduce the number of readings.
- the area data that is not specified by the read request located between the area data is read in a lump. Then, the area data group read from the storage unit 13 is temporarily stored in the cache area of the RAM 15B.
- a plurality of area data specified by a read request located at a position distant from the address space are included, including area data not specified by a read request positioned between them. And read them together. Therefore, the number of times of reading area data from the storage unit 13 can be reduced and the processing load and processing time related to reading can be reduced compared to the case of individually reading each area data of each section designated by the read request. The necessary area data can be read at high speed.
- the area data not specified by the read request is also read, but is not specified by the read request located between the area data specified by the read request. Since the area data is in a close positional relationship with the area data specified by the read request on the road map, the map data can be displayed as the user moves or the route search / guidance process progresses by caching them. When a read request is made from the route search process, the corresponding data can be read from the RAM 15B at high speed.
- the area data can be read from the RAM 15B at high speed when necessary while reducing the number of times of reading from the storage unit 13 by the above-described method, and a navigation apparatus with excellent processing performance is constructed. be able to.
- a group of area data included in the address range from the group of the corresponding area data to the end point address of the area data having the lowest road case and whose position in the address space is the lowest.
- the number of times of reading can be further reduced, and high-speed and efficient reading can be performed.
- the present disclosure is not limited to the above-described embodiments, and can take various forms.
- the group of corresponding area data is grouped, and for each group, the group of corresponding area data is You may make it read collectively including the area data which are not designated by the read request located between these area data.
- the read end address setting process may be changed as follows. That is, in S251, in the area data group that has not been read, the lowermost area data (the road grade is the lowest) is the first layer area data, and the unread area data is the first layer.
- the read end address setting process may be changed so that an affirmative determination is made when there is only area data, and a negative determination is made otherwise.
- a processing loop of S230 to S260 is performed.
- the end address of the area data whose road space is other than the lowest and whose position in the address space is the end is set as the read end address.
- the area data included in the address range is read out collectively, and the processing loop of S230 to S260 is performed twice.
- a group of area data of the first layer that is not read out is to be read out.
- the storage position of the area data of the medium section designated by the read request and the area data of the small section are stored. There is a case where the storage position is far away from the storage position, and when all the area data of each partition specified by the read request is read at once, the number of area data not specified by the read request increases. In such a case, if the area data is grouped and read together for each group as described above, the storage capacity required for the cache area of the RAM 15B can be suppressed, although the number of times of reading increases.
- a group of area data specified by a read request As another example of reading a group of area data specified by a read request collectively for each of a plurality of groups, it is specified by a read request in which there are area data not specified by a predetermined number or more of read requests.
- An example is considered in which a group of area data designated by a read request is grouped using the two area data as a boundary, and the corresponding group of area data is read together for each group.
- the difference map data is provided to the navigation device by the digital broadcast signal.
- the difference map data is stored in a wireless communication network such as a cellular network, a medium such as a USB memory or an SD card. May be provided to the navigation device. That is, the difference map data can be provided to the navigation device through various media.
- the storage unit 13 corresponds to an example of a map data storage device or a map storage device
- the RAM 15B corresponds to an example of a temporary storage device or a temporary memory
- the read control process is an example of a process realized by the read control unit.
- the discard unit, device, or means is also referred to.
- the map display process, the route search process, and the route guidance process are also referred to as a process execution unit, a device, or a means.
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Abstract
Description
Claims (8)
- 特定地域の道路網を道路格により階層表現してなる道路地図データであって、前記道路格は、最上位と最上位以外を含み、前記特定地域における各々の道路格に対応する層データを備え、前記層データの夫々が、一つ又は複数のエリアデータからなり、少なくとも前記最上位以外の前記層データが、前記特定地域を分割してなる複数の区画に対応するエリアデータを備え、連続するアドレス空間においてエリアデータの一群が前記道路格の順に配列される前記道路地図データを記憶する地図記憶装置(13)と、
前記地図記憶装置よりも高速なアクセス速度を持ち、前記地図記憶装置から読み出されたエリアデータの一群を一時記憶する一時メモリ(15B)と、
読出要求により要求されたエリアデータの一群を、前記地図記憶装置及び前記一時メモリの一方から読み出して読出要求元に提供する読出制御部(15A)と、
を備え、
前記読出制御部は、
前記読出要求により要求された前記要求されたエリアデータの一群の内、前記一時メモリが記憶するエリアデータの一群を、前記一時メモリから読み出す一方、前記読出要求により要求された前記要求されたエリアデータの一群の内、前記一時メモリに記憶されていないエリアデータの一群を、前記地図記憶装置から読み出し、
前記読出要求により要求された前記一時メモリに記憶されていないエリアデータの一群を前記地図記憶装置から読み出す際には、該当するエリアデータの一群として、前記メモリに記憶されていないエリアデータの一群と前記アドレス空間上で前記メモリに記憶されていないエリアデータの一群の間に位置する読出要求により要求されていない前記エリアデータも含めて、一つあるいは複数のグループ毎にまとめて読み出すと共に、前記地図記憶装置から読み出した前記該当するエリアデータの一群を、前記一時メモリに一時記憶させること
を特徴とする情報処理システム。 - 前記地図記憶装置においては、前記道路格は、前記最上位以外に含まれる最下位格を含み、エリアデータの一群が前記道路格が最上位又は最下位からの順に配列されるように記憶されており、
前記読出制御部は、前記一時メモリに記憶されていない前記エリアデータの一群を前記地図記憶装置から読み出す際には、前記該当するエリアデータの一群の内、前記道路格が最下位以外のエリアデータの一群であって前記アドレス空間における位置が先頭である始点アドレスから、前記該当するエリアデータの一群の内、前記道路格が最下位以外のエリアデータの一群であって前記アドレス空間における位置が末尾である終点アドレスまでのアドレス範囲に少なくとも含まれるエリアデータの一群をまとめて読み出すこと
を特徴とする請求項1記載の情報処理システム。 - 前記地図記憶装置においては、エリアデータの一群が前記道路格が上位又は下位からの順に配列されるように記憶されており、
前記読出制御部は、前記一時メモリに記憶されていない前記エリアデータの一群を前記地図記憶装置から読み出す際には、前記該当するエリアデータの一群の内、前記アドレス空間における位置が先頭の始点アドレスから、前記該当するエリアデータの一群の内、前記アドレス空間における位置が末尾の終点アドレスまでのアドレス範囲に含まれる前記エリアデータを一括して読み出すこと
を特徴とする請求項1又は請求項2記載の情報処理システム。 - 前記地図記憶装置においては、前記エリアデータの一群が前記道路格が上位から下位へ順に配列されるように記憶されており、
前記読出制御部は、前記一時メモリに記憶されていない前記エリアデータの一群を前記地図記憶装置から読み出す際には、前記該当するエリアデータの一群の内、道路格が最上位に対応する層データの前記アドレス空間における位置が先頭の始点アドレスから、前記該当するエリアデータの一群の内、道路格が最下位に対応する層データの前記アドレス空間における位置が末尾の終点アドレスまでのアドレス範囲内に含まれるエリアデータの一群を前記地図記憶装置から一括して読み出すこと
を特徴とする請求項1~請求項3のいずれか一項記載の情報処理システム。 - 前記一時メモリが一時記憶する前記エリアデータの一群の内、読出頻度が所定水準未満のエリアデータの一群を前記一時メモリから破棄する破棄部を備え、
前記破棄部は、前記道路格毎に異なる前記水準を割り付けることにより、前記道路格がより下位に対応するエリアデータから優先的に破棄すること
を特徴とする請求項1~請求項4のいずれか一項記載の情報処理システム。 - 前記道路格毎の前記層データは、前記道路格がより下位の前記層データはより小さい区画に対応するエリアデータを備えること
を特徴とする請求項1~請求項5のいずれか一項記載の情報処理システム。 - 前記道路地図データは、三段階以上で定義された前記道路格の夫々の前記層データを備えること
を特徴とする請求項1~請求項6のいずれか一項記載の情報処理システム。 - 前記読出制御部は、道路地図を表示する地図表示処理、目的地までの経路を探索する経路探索処理、及び、目的地までの経路を案内する経路案内処理の少なくとも一つを実行する処理実行部からの読出要求に応じて、当該読出要求により要求された前記エリアデータの夫々を読み出すこと
を特徴とする請求項1~請求項7のいずれか一項記載の情報処理システム。
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JPH02240680A (ja) * | 1989-03-14 | 1990-09-25 | Matsushita Electric Ind Co Ltd | 地図読み出し装置 |
JPH11344351A (ja) * | 1998-05-29 | 1999-12-14 | Clarion Co Ltd | ナビゲーションシステム及びナビゲーション方法並びにナビゲーション用ソフトウエアを記録した記録媒体 |
JP2002324069A (ja) * | 2001-04-25 | 2002-11-08 | Dream Technologies Kk | データ管理装置及び地図表示システム |
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JP5790571B2 (ja) | 2015-10-07 |
US20150094954A1 (en) | 2015-04-02 |
CN104205190A (zh) | 2014-12-10 |
JP2013210545A (ja) | 2013-10-10 |
DE112013001801T5 (de) | 2014-12-18 |
US9291464B2 (en) | 2016-03-22 |
CN104205190B (zh) | 2016-08-17 |
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