CN101294819B - Navigation system client terminal, service terminal, and map data providing and responding method - Google Patents
Navigation system client terminal, service terminal, and map data providing and responding method Download PDFInfo
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Abstract
The invention discloses a client of a navigation system, a corresponding server, a method for providing map data of the client of the navigation system, and a matched server response method. The client comprises a storage module, a navigation module and a storage update module. When the storage module does not have the required map data, the client is used for downloading the map data, storing the map data in the storage module and providing the map data for the navigation module for navigation; the corresponding server comprises a data extraction request receiving module and is used for acquiring the content of the request by the client according to the data extraction request receiving module and sending the requested map data to a map data sending module of the client. As the storage update module is arranged in the client, when the required map data is not available in the client, the client can automatically download the required map data from the corresponding server, thereby realizing the navigation function, allowing the client with inadequate map data to acquire the required map data from the server, and facilitating use.
Description
Technical field
The present invention relates to the GPS navigation field, in particular, relate to a kind of client of navigational system, corresponding service end, and the map datum of the client of navigational system provides method and the method for the service end response that is mated.
Background technology
At present, (Global Positioning System GPS) is one of GPS navigation important application direction to automobile-used GPS.The gps antenna of automobile-used GPS navigation system receives from 3 data messages that transmitted in earth-circling 24 gps satellites at least, in conjunction with the electronic chart that is stored in the Vehicular navigation terminal, the position coordinates of determining by gps satellite signal is complementary therewith, determines the accurate position of navigation object in electronic chart.
Fig. 1 shows the structure of existing navigational system and forms:
Described navigational system comprises: the control device 6 and the GPS receiving trap 16 that is connected with control device 6 of loudspeaker 1, memory module 2, input media 3, voice output 4, display device 5, difference control store module 2, input media 3 and voice output 4.
Described control device 6 is a microcomputer, as adopting palm PC, smart mobile phone, car-mounted terminal etc.It comprises: user interface control module 7, map data management module 8 and navigation module 9; Navigation module 9 is mainly by Navigation Control module 10, map display module 11, route guidance module 12, path searcher module 13, information point indexing unit 14, constitute from car position detection module 15.
Preserve contents such as map datum, control program data in the memory module 2; Memory module 2 can be chuck assembly, matches records such as the map datum in the recording medium, control program data are read with inserting wherein recording medium, is reduced into numerical data, and delivers to and deliver to control device 6.Described recording medium for example can adopt safe digital card (Secure Digital Card, SD), flash card (Trans Flash Card, TF) etc.
Input media 3 can use button, rocking bar, knob or touch pad etc.Input media 3 is used to import user's various requirement, user's input signal is delivered in the user interface control module 7 of control device 6.
The voice data translation that voice output 4 is sent control device 6 here is a voice signal, delivers to loudspeaker 1.The voice signal that loudspeaker 1 is sent voice output 4 here converts sound and output to, and like this, loudspeaker 1 just can cooperate the needs of control device 6, sends the voice of various operational notifications and route guidance.
The signal that GPS receiving trap 16 receives from gps satellite, detect the present position and the moving direction of vehicle, and convert detected result to protocol data, these protocol datas further be sent in the navigation module 9 of control device 6 from car position detection module 15.
The user interface control module 7 of control device 6 receives the input of input media 3, generates and the desired content control instruction corresponding of input, delivers among the one or more submodules in the navigation module 9.In addition, user interface control module 7 response steering orders, and the result of returning from navigation module 9, deliver among voice output 4, the display device 5.
The requirement of the map data management module 8 response navigation modules 9 of control device 6 is read map datum from memory module 2, also contains the data content that is useful on picture guiding usefulness in these map datums.
All the other submodules of navigation module 9 are controlled and called to the Navigation Control module 10 of navigation module 9.
The map display module 11 of navigation module 9 generates the video data that map shows usefulness according to the map data information of reading from map data management module 8, delivers to user interface control module 7.
The route guidance module 12 of navigation module 9 obtains map datum from map datum processing module 8, it is carried out the path induce processing, and inducing result to return to map data management module 11, read so that map data management module 11 is predicted.Data such as the interface in the time of also will inducing in addition, navigation speech send user interface control module 7 to.
The path searcher module 13 of navigation module 9 obtains map datum from map data management module 8, and processing is directly explored in walking along the street in fact, and with track search return path bootstrap module 12 as a result.
In the prior art, navigational system need just can accurately guide the user to arrive the destination or realizes that the information point retrieval waits other function when navigating by detailed electronic chart.Present navigational system is stored in whole electronic map datas in the memory module of navigator usually, and navigational system is directly called electronic map data according to the demand of functional module.Because electronic map data is very huge, need hundreds of storage spaces of going up gigabit as People's Republic of China's electronic map data.This has proposed very high requirement to hardware, makes the terminal device that some memory capacity are little, can't realize navigation feature as little memory capacity mobile phone, has limited the application of navigational system.For example, though more existing smart mobile phones are supported navigation feature, but its storage ROM capacity is often only about 50,000,000, because memory capacity is too little, can't hold all electronic charts, therefore more existing navigational system adopt the mode of only preserving very little a part of map to carry out zonal navigation usually.But because the possibility that the user exists republican all places of the centering Chinese people to navigate, therefore, the less navigational system of this hardware store capacity can not be navigated to other zones beyond the zone of the map datum support in its memory module fully, uses very inconvenient.
Summary of the invention
For overcoming above-mentioned defective, technical matters to be solved by this invention provides a kind ofly can download required map automatically, use the client of convenient navigational system, corresponding service end, and the map datum of the client of navigational system provides method and the method for the service end response that is mated.
The objective of the invention is to be achieved through the following technical solutions:
A kind of client of navigational system comprises:
Memory module is used to preserve the map sheet data;
Navigation module is used for navigating from the map sheet data of memory module extraction needs;
Described client also comprises the storage update module, is used for when memory module does not have the map sheet data of navigation module needs, downloads the map sheet data that need from service end, is kept in the memory module, offers navigation module and navigates.
Described storage update module comprises:
The map sheet extraction module is used for when memory module is preserved the map sheet data that navigation module asks, and reads the map sheet data that the navigation module request provides and return to navigation module from memory module and use;
Data extract request generation module is used for when memory module is not preserved the map sheet data that navigation module asks, and the map sheet that needs press predetermined protocol generation data extract request;
The data extract request sending module is used for the data extract request that data extract request generation module generates is sent to the service end of navigational system;
Map sheet packet receiver module is used to receive the response protocol bag that the service end of navigational system is beamed back;
Response protocol bag parsing module is used to resolve the response protocol bag that map sheet packet receiver module receives, and obtains the corresponding map sheet data of the client-requested that service end returns;
Map sheet is preserved module, is used for that response protocol bag parsing module is resolved the map sheet that obtains and is stored to memory module.
Described storage update module also comprises:
The capacity judge module that exceeds the quata, whether the summation of the original map sheet data capacity of memory module that is used for judging map sheet data capacity after response protocol bag parsing module is resolved and client is greater than maximum map sheet data limit;
Old map sheet removing module, be used for exceeding the quata the summation of the original map sheet data capacity of memory module that judge module judges map sheet data capacity after response protocol bag parsing module is resolved and client during greater than maximum map sheet data limit when capacity, according to preset rules delete in the current memory module temporarily use less than the map sheet data, be that the map sheet data capacity that receives and the summation of the original map sheet data capacity of client are not more than maximum map sheet data limit until the exceed the quata testing result of judge module of capacity;
Wherein, described map sheet is preserved module and is only exceeded the quata to work when judge module judges that the summation of original map sheet data capacity in the memory module of map sheet data capacity after response protocol bag parsing module is resolved and client is not more than maximum map sheet data limit at capacity.Such design makes owing to for the map sheet memory block of client the memory capacity limit being set, if map sheet data capacity that service end is beamed back and the original map sheet capacity of client sum are greater than the memory capacity limit, just delete those the temporary transient unwanted map sheets in the map sheet memory block of client, the map sheet data of just service end being beamed back during less than the memory capacity limit up to map sheet data capacity that service end is beamed back and the existing map sheet capacity sum of client join in the map sheet memory block of client, have reached the purpose that Automatic Cycle is utilized less storage space.
A kind of service end of navigational system comprises:
Data extract request receiver module is used to receive the data extract request that client sends;
The map sheet data transmission blocks is used for obtaining the client-requested content according to data extract request receiver module; The map sheet data that its request is sent are sent to client.
A kind of map datum of client of navigational system provides method, may further comprise the steps:
A: wait for that the navigation module request provides the map sheet data of its appointment;
B: check whether preserve above-mentioned map sheet data in the current memory module,, provide it to navigation module and navigate, change steps A if having; If do not have, send the data extract request of specifying map sheet information that carries to service end;
C: receive the map sheet data of the corresponding map sheet that service end returns, be saved in the memory module, and provide it to navigation module and navigate, change steps A.
Among the described step C, further comprising the steps of:
C1: relatively whether the amount of capacity of the map sheet data returned of service end is greater than the amount of capacity of the remaining space of memory module, if, the map sheet data that service end is returned directly are saved to the relevant position in the memory module, provide it to navigation module and navigate, and change steps A; If not, then according in the default deletion rule deletion memory module temporarily use less than the map sheet data, re-execute step C1.Further, when the capacity of the client of navigational system is not enough when preserving newly downloaded map datum, just in the client of navigational system some used or temporary transient unwanted map datums are deleted, to preserve newly downloaded map datum, this is the situation of clearing up map datum automatically.Certainly, the client of navigational system can also be asked modes such as the user manually deletes.
In the described memory module, whether being provided with of each map sheet correspondence is used to identify this map sheet is the built-in map sheet sign of built-in map sheet;
Described default deletion rule is:
Select the map sheet that download time non-built-in map sheet conduct the earliest can be deleted in the memory module.This deletion rule acquiescence download time map sheet the earliest is the temporary transient unwanted map sheet that can delete.
In the described memory module, whether being provided with of each map sheet correspondence is used to identify this map sheet is the built-in map sheet sign of built-in map sheet;
Described default deletion rule is:
The zone of map sheet in the map datum according to its covering is divided into respectively: the map sheet of the map sheet of current task region, current task close region and other regional map sheets; Delete other regional map sheets earlier; When not having other regional map sheets, the map sheet of deletion current task close region.
In the described default deletion rule,
When the same area has the different map sheet of plural engineer's scale to delete, delete the map sheet different earlier with the map sheet engineer's scale of current demonstration.
A kind of and the map datum of above-mentioned client provide the method for the service end response of the navigational system that method cooperates, and may further comprise the steps:
D: wait for the data extract request that carries appointment map sheet information that client sends that receives;
E: pairing all the map sheet data of map sheet information in extraction and the data extract request, send it to client, return step D.
The present invention is owing to the client in navigational system is provided with the storage update module, when not having the map sheet data that need in the client, can download the map sheet data that need automatically from corresponding service end, realize navigation feature, even make the client finite capacity that some map datums are incomplete, also can obtain the map datum of needs from service end, make things convenient for the user to go on a journey, use convenient.
Description of drawings
Fig. 1 is the structural representation of navigational system in the prior art;
Fig. 2 is in the embodiment of the invention, the graphic layer structure of the map datum of service end and client and the structural representation that carries out the map sheet division on the figure layer;
Fig. 3 is in the embodiment of the invention, and the map sheet of a figure layer on some areas distributes and cover synoptic diagram;
Fig. 4 is the synoptic diagram of the data store organisation in the map sheet of client in the embodiment of the invention;
Fig. 5 is a response protocol packet format synoptic diagram in the embodiment of the invention;
Fig. 6 is the structural representation of storage update module of the client of navigational system in the embodiment of the invention;
Fig. 7 is the structural representation of the service end of navigational system in the embodiment of the invention;
Fig. 8 is the wireless telecommunications synoptic diagram of the client and the service end of navigational system in the embodiment of the invention;
Fig. 9 is the workflow diagram of the client of navigational system in the embodiment of the invention;
Figure 10 is the workflow diagram of the service end of navigational system in the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
Invention thinking of the present invention is: because the client of navigational system is when only having the map datum of subregion, also can normally navigate at this subregion, navigation system users only need obtain some road sections when using navigational system data can realize navigation, when browsing map or retrieving information point, also only need the map datum of specific region, therefore, client for the less navigational system of capacity, can drive on the limit, the limit is by wireless network (GSM for example, CDMA, WIKI etc.) service end that provides of the operator of communications protocol navigation system is sent the data extract request, map datum from the required zone of service end dynamic download that stores whole electronic map datas, when the capacity of the client of navigational system is not enough when preserving newly downloaded map datum, just in the client of navigational system, some used or temporary transient unwanted map datums are deleted, to preserve newly downloaded map datum.By this mode, guarantee that the client of navigational system can be loaded the required whole electronic map datas of current operation task under the situation within memory capacity is limited to more among a small circle.Client no longer is subjected to the restriction of its amount of capacity, is navigated in the zone of all service end supports easily.
The electronic map data that is stored in client and service end is to preserve with the structure of scheming layer and map sheet, wherein, the figure layer of electronic map database and map sheet structure as shown in Figure 2, different figure layers is to draw according to different engineer's scale, for different displaying ratio chi uses.
Therefore, each figure layer required data fine degree is different, and needed data storage capacity is also different.For example among Fig. 2, ground floor is used for national general view, therefore, the wide and higher position of map sheet is very big, and what deposited the inside also is that those important roads are (as super expressway between provincial capital and national highway, the city is only represented with a round dot in the drawings, do not have the city details), and when electronic chart amplified, support the figure layer that shows used Data Source can change, the data minutiae point of this figure layer increases, and a geographic range that map sheet covered of this figure layer also can diminish simultaneously.Map datum in each map sheet is divided into road point data, information point data, face of land terrain data etc. by attribute.Fig. 3 shows the map sheet distribution of a figure layer on some areas and covers the signal situation.Fig. 4 shows the data store organisation in the map sheet.
Wherein, the electronic map data that is stored in client comprises (engineer's scale is less) map datum of the higher level in all or part of zone, and the data store organisation chained list of diagram data fully, usually these data are the most frequently used data, above-mentioned map sheet is the built-in map sheet of client, accordingly, the map sheet of downloading from service end promptly is called non-built-in map sheet.The identification of built-in map sheet can realize by dual mode: the one, indicate in the map sheet information of each map sheet whether it is built-in map sheet; The 2nd, in memory module, divide built-in map sheet memory block and non-built-in map sheet memory block for built-in map sheet separately.
When the client of navigational system was navigated work, the guiding that its navigation module is realized as required, demonstration task drew the electronic map data of which type of which map sheet that need call which figure layer.When calculating guidance path, can adopt following two kinds of methods:
The one, all only be kept at the situation that service end, client are not preserved at the road guide topological data: at this moment, when the user navigates, can earlier starting point and destination be sent to service end, after service end calculates guidance path, this guidance path is sent to client, and client is according to the map sheet of current parking stall position request periphery; Because the storage space that the road guide topological data takies can't be very big, and the very frequent use of road guide topological data is therefore, convenient inadequately when this technical scheme is used.
The 2nd, be kept at the situation of client at the road guide topological data, also be employed technical scheme in the embodiment of the invention: the user directly calculates guidance path in client, and drawing needs the map sheet used.
Navigation module is when providing the map sheet data of its appointment to the memory module request, be ask in advance (shift to an earlier date several map sheets, or calculate with the current line vehicle speed, in advance what minute the time request to provide with location, current parking stall be what map sheets under the current engineer's scale at center, with the different proportion chi, corresponding to what map sheets of position, current parking stall).This is the same with pretreated mode of the prior art.When arriving the edge of map sheet institute coverage of current demonstration as: current parking stall one, promptly ask memory module that other map sheets of this map sheet periphery are provided, the map sheet that need use as current task.As, the storage module of must seeking survival provide map sheet therewith adjacent map sheet (that is be that radius unit asks, with a map sheet.) certainly, consider that the problem of network service speed may be slow, therefore, the advanced processing amount of navigation module can be strengthened in the present invention, more filing a request of morning, or each request provides more map sheet, specifically can be according to the actual conditions adjustment.
In addition, navigation module not merely when reality is navigated, just can propose the data extract request to memory module, as, the user is when selecting to browse other regional maps, and navigation module also can think that memory module proposes the data extract request according to the zone of browsing.
Navigational system with these data extract requests according to the predefine protocol packing, be sent to service end through wireless network, after service end is extracted request analysis to data, with the electronic map data of the figure layer of correspondence, map sheet, attribute by protocol packing, be sent to client through wireless network, client is stored in the memory module after the map datum that receives is resolved, and offers navigation module and calls.
Client is provided with map sheet existence judge module, is used for judging whether the related map sheet of map sheet request of data of navigation module request is present in the memory module of client, if exist, then directly provides it to navigation module and navigates; If there is no, then use following described agreement to send the data extract request.The protocol format of data extract request is figure layer ID+ (comma)+map sheet ID+ (branch; ), there is the request of a plurality of map sheets just to repeat top form, for example: figure layer ID, map sheet ID; Figure layer ID, map sheet ID;
After above-mentioned data extract request was finished in packing, client sent the data extract request of map sheet data to service end by home control network communication protocol.Service end receives this data extract request and resolves, find corresponding map sheet to read according to figure layer ID that is asked and map sheet ID, and by as shown in Figure 5 response protocol packet format to above-mentioned map sheet packing data, and send back to client by wireless communication networks.As shown in Figure 5, the structure of response protocol packet format is as follows: the map sheet number; The service end time; The map sheet ID that multiplicity is identical with the map sheet number, beginning side-play amount, data length; The map sheet data segment that its number is identical with the map sheet number.Wherein, in data segment map sheet ID, beginning side-play amount, data length, the beginning side-play amount that is arranged in map sheet ID back be the database of the pairing map sheet data of this map sheet ID in the starting position of response flow, the data length that is positioned at beginning side-play amount back is meant the data length of corresponding map sheet data.
Client receives after the response protocol bag, be kept at earlier in the buffer memory of client, the response protocol bag is resolved, obtain the data segment and the data segment data volume sum of all map sheets, if its capacity is size_response, whether enough preserve the map sheet data of downloading from service end for the capacity of monitor client, the capacity of the data volume of the data segment of current all map sheets in the memory module of client is designated as size_origin, the max cap. that the memory module of client can be preserved the map sheet total amount is that maximum map sheet data limit is designated as size_total, the free memory of the common client of this size_total is little, for example the free memory of client device has only 50M, then this size_total can be arranged to 40M, or 30M.Because, size_origin is bound to littler than size_total, but, possible size_origin+size_response is bigger than size_total, therefore, if this type of situation has taken place, the not enough map sheet of downloading from service end of preserving of capacity of active client is described then, just need optionally delete the map sheet in the client, deletion in the memory module temporarily use less than the map sheet data to discharge the storage space of client.Its deletion rule can specifically be provided with according to actual conditions.
As, above-mentioned deletion rule can be: the zone of the map sheet in the map datum according to its covering is divided into respectively: the map sheet of the map sheet of current task region, current task close region and other regional map sheets; Delete other regional map sheets earlier; When not having other regional map sheets, the map sheet of deletion current task close region wherein, when the same area has the different map sheet of plural engineer's scale to delete, is deleted the map sheet different with the map sheet engineer's scale of current demonstration earlier.Such design select as much as possible in the memory module temporarily use less than the map sheet data delete.
Also can be: select the map sheet that download time non-built-in map sheet conduct the earliest can be deleted in the memory module.This deletion rule acquiescence download time map sheet the earliest is the temporary transient unwanted map sheet that can delete.
Every deletion one width of cloth map sheet, just recomputate size_origin, then, check whether size_origin+size_response is also big than size_total, if size_origin+size_response still greater than size_total, continues the map sheet in the client is optionally deleted; If size_origin+size_response no longer greater than size_total, then no longer deletes map sheet, be used for navigation in the memory module of client and the map sheet that service end is sent is joined, and calculate the size_origin that makes new advances.
Certainly, also can be first the big or small size_response of the data that feed back to that send of reception server end, whether the capacity that detects client again is enough, delete the temporary transient unwanted map sheet in the client when not enough again, when the result of the big or small size_response addition of the data that make the capacity size_origin of client and feed back to is not more than size_total, receive the response protocol bag that service end sends again, resolve and be kept in the memory module.Such design makes client no longer need to mark off specially buffer memory to be used for the temporary transient data that receive from service end of preserving.
Fig. 6 shows the structure of storage update module of the client of navigational system, and it comprises:
Map sheet request judge module 101, whether the navigation module that is used to judge active client asks to provide the map sheet data of its appointment;
Map sheet existence judge module 102 is used for judging in the memory module of client whether preserve the map sheet data that navigation module that map sheet request judge module 101 receives is asked; If have, 103 work of map sheet extraction module; If do not have, 104 work of data extract request generation module;
Map sheet extraction module 103 is used for reading the map sheet data that the navigation module request provides and returning to navigation module from memory module using;
Data extract request generation module 104 is used for the map sheet ID of the non-existent map sheet of the memory module request of extracting is generated the data extract request by predetermined protocol;
Data extract request sending module 105 is used for the data extract request that data extract request generation module 104 generates is sent to the service end of navigational system;
Map sheet packet receiver module 106 is used to receive the response protocol bag that the service end of navigational system is beamed back;
Response protocol bag parsing module 107 is used to resolve the response protocol bag that map sheet packet receiver module 106 receives, and obtains the corresponding map sheet data of the client-requested that service end returns;
The capacity judge module 108 that exceeds the quata, whether the summation of the original map sheet data capacity of memory module that is used for judging map sheet data capacity after response protocol bag parsing module 107 is resolved and client is greater than maximum map sheet data limit, as its result during greater than maximum map sheet data limit, old map sheet removing module 109 work; As its result during less than maximum map sheet data limit, map sheet is preserved module 110 work;
Old map sheet removing module 109, be used for according to preset rules delete in the current memory module temporarily use less than the map sheet data, be that the map sheet data capacity that receives and the summation of the original map sheet data capacity of client are not more than maximum map sheet data limit until the exceed the quata testing result of judge module 108 of capacity;
Map sheet is preserved module 110, is used for that response protocol bag parsing module 107 is resolved the map sheet that obtains and is stored to memory module.
Fig. 7 shows the part-structure of the service end of navigational system, and it comprises:
Service end map sheet data memory module 200 is used to preserve the most complete up-to-date map sheet data;
Data extract request receiver module 201 is used to receive the data extract request that client sends;
Data extract request analysis module 202 is used for parsing request content from the data extract request that data extract request receiver module 201 obtains the map sheet ID of the map sheet that i.e. request is returned;
Map sheet read module 203 is used for resolving the map sheet ID that obtains according to data extract request analysis module 202 and reads corresponding map sheet data from service end map sheet data memory module 200;
Response protocol bag generation module 204 is used for according to predefined agreement, and the map sheet packing data that map sheet read module 203 is read becomes the response protocol bag;
Response protocol bag sending module 205 is used for the response protocol bag that response protocol bag generation module 204 generates is sent to client.
Wherein, the communication form of the client of navigational system and service end as shown in Figure 8.
As shown in Figure 9, the workflow of the electronic map data request of navigational system service end may further comprise the steps:
Step S101 waits for that the navigation module request of client sends the map sheet data of its appointment;
Step S102 judges whether the map sheet data that navigation module is asked exist; As having execution in step S104, otherwise execution in step S104;
Step S103 returns the map sheet data of being asked and offers navigation module;
Step S104 uses client and the unified protocol packing data extract request of service end; Wherein, its protocol format is: figure layer ID+ (comma)+map sheet ID+ (branch; ), if there is the request of a plurality of map sheets just to repeat top form, for example: figure layer ID, map sheet ID; Figure layer ID, map sheet ID;
Step S105, the data extract request that packing among the step S104 is good sends to service end; The detailed process of its transmission depends on the communication modes between client and the service end, GSM for example, and CDMA, WIKI etc. all can realize concrete communication process between client and the service end with reference to the correlation technique standard document;
Step S106 receives the response protocol bag that service end is returned;
Step S107, the resolution response protocol package obtains the map sheet data corresponding with its map sheet ID that asks;
Step S108, the capacity whether summation of judging the map sheet data capacity of this reception and original map sheet data capacity exceeds client fills value perhaps, in this way, execution in step S109 then, otherwise execution in step S110;
Step S109, according to default deletion rule remove temporarily use in the former map sheet data less than map sheet; Return S108 then and reexamine capacity;
Step S110 joins in the memory module downloading map sheet, is kept at the corresponding position in the map sheet data acquisition in the memory module;
Step S111 returns the map sheet of being asked and gives navigation module.
Wherein, the setting of step S108 and S109 is in order to select to judge temporary transient unwanted map sheet by automated intelligent under the full situation of the capacity of client, obtaining storage space continues navigation and is provided with, also this step can be set, perhaps manually select deletion map sheet data, perhaps all emptying all non-built-in map sheets etc., all is can realize of the present inventionly obtaining purpose that map datum is used to navigate.
Corresponding, as shown in figure 10, the workflow of the electronic map data of navigational system service end response may further comprise the steps:
Step S201 waits for and receives the data extract request of the client transmission of navigational system;
Step S202, the request of extracting is resolved to data, obtains its map sheet information that will ask that client sends;
Step S203 reads all map sheet data of the map sheet information correspondence of being asked;
Step S204, the map sheet data that the protocol packing of using client, service end to reach an agreement on has mutually read;
Step S205 sends the response protocol bag to client.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. the client of a navigational system comprises:
Memory module is used to preserve the map sheet data;
Navigation module is used for navigating from the map sheet data of memory module extraction needs;
It is characterized in that,
Described client also comprises the storage update module, is used for when memory module does not have the map sheet data of navigation module needs, downloads the map sheet data that need from service end, is kept in the memory module, offers navigation module and navigates;
Described storage update module comprises:
The map sheet extraction module is used for when memory module is preserved the map sheet data that navigation module asks, and reads the map sheet data that the navigation module request provides and return to navigation module from memory module and use;
Data extract request generation module is used for when memory module is not preserved the map sheet data that navigation module asks, and the map sheet data that need press predetermined protocol generation data extract request;
The data extract request sending module is used for the data extract request that data extract request generation module generates is sent to the service end of navigational system;
Map sheet packet receiver module is used to receive the response protocol bag that the service end of navigational system is beamed back;
Response protocol bag parsing module is used to resolve the response protocol bag that map sheet packet receiver module receives, and obtains the corresponding map sheet data of the client-requested that service end returns;
Map sheet is preserved module, and the map sheet data storage that is used for the parsing of response protocol bag parsing module is obtained is to memory module;
The capacity judge module that exceeds the quata, whether the summation of the original map sheet data capacity of memory module that is used for judging map sheet data capacity after response protocol bag parsing module is resolved and client is greater than maximum map sheet data limit;
Old map sheet removing module, be used for exceeding the quata the summation of the original map sheet data capacity of memory module that judge module judges map sheet data capacity after response protocol bag parsing module is resolved and client during greater than maximum map sheet data limit when capacity, according to preset rules delete in the current memory module temporarily use less than the map sheet data, be that the map sheet data capacity that receives and the summation of the original map sheet data capacity of client are not more than maximum map sheet data limit until the exceed the quata testing result of judge module of capacity;
Wherein, described map sheet is preserved module and is only exceeded the quata to work when judge module judges that the summation of original map sheet data capacity in the memory module of map sheet data capacity after response protocol bag parsing module is resolved and client is not more than maximum map sheet data limit at capacity.
2. the map datum of the client of a navigational system as claimed in claim 1 use provides method, it is characterized in that, may further comprise the steps:
A: wait for that the navigation module request provides the map sheet data of its appointment;
B: check whether preserve above-mentioned map sheet data in the current memory module,, provide it to navigation module and navigate, change steps A if having; If do not have, send the data extract request of specifying map sheet information that carries to service end;
C: receive the map sheet data of the corresponding map sheet that service end returns, be saved in the memory module, and provide it to navigation module and navigate, change steps A;
Among the described step C, further comprising the steps of:
C1: relatively whether the amount of capacity of the map sheet data returned of service end is less than the amount of capacity of the remaining space of memory module, if, the map sheet data that service end is returned directly are saved to the relevant position in the memory module, provide it to navigation module and navigate, and change steps A; If not, then according in the default deletion rule deletion memory module temporarily use less than the map sheet data, re-execute step C1.
3. map datum as claimed in claim 2 provides method, it is characterized in that, in the described memory module, whether being provided with of each map sheet correspondence is used to identify this map sheet is the built-in map sheet sign of built-in map sheet;
Described default deletion rule is:
Select the map sheet that download time non-built-in map sheet conduct the earliest can be deleted in the memory module.
4. map datum as claimed in claim 2 provides method, it is characterized in that, in the described memory module, whether being provided with of each map sheet correspondence is used to identify this map sheet is the built-in map sheet sign of built-in map sheet;
Described default deletion rule is:
The zone of map sheet in the map datum according to its covering is divided into respectively: the map sheet of the map sheet of current task region, current task close region and other regional map sheets; Delete other regional map sheets earlier; When not having other regional map sheets, the map sheet of deletion current task close region.
5. map datum as claimed in claim 4 provides method, it is characterized in that, in the described default deletion rule,
When the same area has the different map sheet of plural engineer's scale to delete, delete the map sheet different earlier with the map sheet engineer's scale of current demonstration.
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| CN2008100677011A CN101294819B (en) | 2008-06-05 | 2008-06-05 | Navigation system client terminal, service terminal, and map data providing and responding method |
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| CN102298636B (en) * | 2011-08-29 | 2013-05-15 | 杭州海康威视数字技术股份有限公司 | Global position system (GPS) data-based monitoring system and device and method for uploading GPS data |
| CN106157229A (en) * | 2015-03-30 | 2016-11-23 | 高德信息技术有限公司 | A kind of electronic chart rendering intent and device |
| CN106556402B (en) * | 2015-09-29 | 2019-12-03 | 高德软件有限公司 | A kind of paths planning method and device |
| JP6922582B2 (en) * | 2017-09-15 | 2021-08-18 | トヨタ自動車株式会社 | Travel control device, travel control system, and travel control method |
| CN108345628B (en) * | 2017-12-20 | 2021-08-03 | 北京都在哪网讯科技有限公司 | Position display method and device of multi-level grid map, processor and terminal |
| CN110047371B (en) * | 2018-01-15 | 2022-03-25 | 北京四维图新科技股份有限公司 | Rendering method and device of vector electronic map |
| CN109495845A (en) * | 2018-09-29 | 2019-03-19 | 百度在线网络技术（北京）有限公司 | Method for changing scenes and equipment |
| CN110275873A (en) * | 2019-06-28 | 2019-09-24 | 重庆紫光华山智安科技有限公司 | File memory method, device, storage management apparatus and storage medium |
| CN111708741B (en) * | 2020-06-24 | 2023-05-05 | 亿咖通(湖北)技术有限公司 | Map data filling method and equipment of vehicle-mounted information entertainment system |
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