CN101738190A - Data difference update method and system - Google Patents
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- CN101738190A CN101738190A CN200810226302A CN200810226302A CN101738190A CN 101738190 A CN101738190 A CN 101738190A CN 200810226302 A CN200810226302 A CN 200810226302A CN 200810226302 A CN200810226302 A CN 200810226302A CN 101738190 A CN101738190 A CN 101738190A
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Abstract
The invention discloses a data difference update method and a system. The method comprises the following steps: referring to a blocking method and a block number thereof of existing formatted map data, extracting changed map data from master data, and formatting the changed map data; storing different map data items of the map data, such as block number, route calculation, road name and background, in different documents; and based on the block number, updating the existing map data items with the changed map data items. The invention can update the map data with smaller data update amount in real time.
Description
Technical field
The present invention relates to a kind of database technology, particularly relate to a kind of method and system of data difference update.
Background technology
In the hyundai electronics map, adopt the mode and the data difference technology of layering road network more.Described layering road network is according to different rank layerings, at the road network of different needs demonstration appropriate levels with road.Described data difference technology is only upgraded the data that change, and the data that maintenance does not change are constant.
In order to realize the map indication, need the different data of scheduling, when needs read mass data, also need corresponding buffering method, to different data carry out appropriate managerial, reasonably organize different data, arrange each data etc. in a certain order, thereby comprise in the map datum management, data parsing method, data content tissue, the data of buffering method, the data of data dispatch, data indexing means, layering situation, divide the annexation between block size, each blocks of data and compile flow process.
In the prior art, the navigational system concrete structure as shown in Figure 1.
Total system is made of navigation server 101 and navigation terminal 102, and the mode by wireless telecommunications connects between the two.
Wherein, navigation server 101 is responsible for finishing the renewal of map datum, and connects with navigation terminal, and the navigation terminal sends the map datum after upgrading.
Navigation server is made up of three parts: map data base 1011, map data update module 1012, map datum downloading service module 1013.
In the prior art, the highway section link data and the node link data of map are carried out the piecemeal processing, so-called piecemeal is handled and is meant: whole map is divided into different rectangular blocks, and every blocks of data is represented this data with unique sign.
Therefore, described map datum comprises block number, map version number and map datum item, and it is as shown in table 1 to preserve form, claims that table 1 is the map datum form shfft.
Table 1
| Block number | Map version number | The map datum item |
| ????001 | On September 1st, 2008 | The expressway, from first ground to second ground ... |
When map datum changes, map data update module 1012 is responsible for upgrading the block number corresponding map data item of this map datum, temporal information according to this moment is provided with corresponding map version number, and the updated map data form shfft is stored in the map data base 1011.
For example, there is map version number in the map data base 1011 and is September 1, block number in 2008 and be 001 map datum, as shown in table 1.The terrain diagram data changes, and the map datum after the variation is as shown in table 2.
Table 2
| Block number | Map version number | The map datum item |
| ????001 | On September 18th, 2008 | The expressway, from first ground to third ground again to second ground ... |
Map datum downloading service module 1013 receives the map datum download request of navigation terminals, and the map datum download interface is provided, and finishes map datum transmission of 102 from navigation server 101 to navigation terminal.
Wherein, map datum local cache 1023 is used for storing the map datum of downloading from navigation Service district device 101 last time.
Map datum down loading updating module 1022 is determined the level and the position of required map datum to find its corresponding block number, and search the map datum that whether has this block number in the map datum local cache 1023 according to this block number according to user's needs:
If no, then by downloading these block number corresponding map data in the map data base of wireless telecommunications from navigation server;
If have, then read the map version number of this map datum, if the map version number of these block number corresponding map data of inquiry in the map data base in navigation server is described two map version number unanimities, the then existing map datum in the updating map data local cache 1023 not; If described two map version numbers are inconsistent, then use in the map data base these block number corresponding map data in should the map data update map datum local cache 1023 of block number.
In the prior art, the method for the Kiwi of employing realizes the renewal of map datum more in said process, and the map data updating method that described Kiwi adopts is as follows:
Include information such as route calculation, road name, background in the block data in the Kiwi data.Its organizational form is that the different piece with every block data leaves in the same file.
When updating map data information, variation has all taken place in the size of every block data in the updated map data information.Because the storage space of block data is changeless, can not adjust accordingly according to the size of the follow-up block data of depositing, therefore, become the end that big block data is merely able to leave in whole file for upgrading the back, finally, data volume can continue to increase along with the renewal amount of new data more.
Simultaneously, in the prior art, the route calculation (Route Calculate:RC) that Kiwi adopts is though data have adopted block division method, but the segmented areas of its RC computational data is too much, and there is Over layer layer between adjacent piece and the piece, with the piece layer and have incidence relation between the piece layer up and down.When map datum took place to upgrade, corresponding change all can take place in the incidence relation between associated with it all piece layers, and therefore each data updated amount can be very big.
In addition, because the Kiwi data have Link ID attribute, and Link ID is through all route levels, and to require path of the same name be continuous, thereby, increase if desired or delete a certain highway section and will destroy whole Link ID attribute, caused inconvenience with regard to the maintenance that makes data like this.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of method of data difference update, utilizes this method, can realize realizing with less Data Update amount the real-time update of map.
For achieving the above object, the invention provides a kind of method of data difference update, this method comprises:
From female database data, extract the map datum item that changes with reference to existing through formaing the method for partition and the block number thereof of the map datum of handling, format processing;
Different map datum items is left in the different files;
According to block number, upgrade existing map datum item with the map datum item that changes.
In the technique scheme, the specific implementation of method of partition is:
When the rectangle drift angle was passed through in the highway section just, passing through a little should be to left down or the bottom right coordinate offset.
In the technique scheme, method of partition is rectangle method of partition or coupling non-rectangle method of partition;
Wherein, the specific implementation of described method of partition can also for:
When node passes through the rectangular edges boundary line just, the node that is positioned on the rectangular edges boundary line should be to the more rectangular block skew of link road hop count order, when the highway section of adjacent rectangle piece linking number is identical, node to the right, offset downward, and guarantee that the highway section does not overlap with the intersection point on rectangular block border.
In the technique scheme, the specific implementation of described method of partition can also for:
When the highway section overlaps with square boundary, the highway section is tilted to handle, and add a map sheet frontier point.
In the technique scheme, it is that the RC compiler formats processing to every block data that described format is handled.
In the technique scheme, described according to block number, the specific implementation of upgrading existing map datum item with the map datum item that changes is:
According to block number,, upgrade existing map datum item with the map datum item that changes in terminal.
In the technique scheme, described according to block number, with the map datum item that changes upgrade existing map datum item specific implementation can also for:
The map datum item that changes is downloaded in the map datum process software,,, and copy to terminal with the existing map datum item of map data update that changes according to block number.A kind of system of data difference update comprises:
Format processing unit: be used for from female database data, extracting the map datum that changes through formaing the method for partition and the block number thereof of the map datum of handling, format processing with reference to existing;
Storage unit: be used for the map datum item that described map datum includes block number, route calculation, road name, background, different map datum items is left in the different files;
Updating block: be used for according to block number, upgrade existing map datum item with the map datum item that changes.
As seen, information such as the route calculation in every valid data described in the present invention, road name, background all leave in the different files, like this, if a certain valid data that upgrade are just when one or several in wherein the route calculation, road name, background rather than whole road information, only upgrade the data that change, do not need whole block data is all upgraded, thereby, the real-time update of map can be realized realizing, a large amount of memory headroom of system needn't be taken with less Data Update.
Description of drawings
Fig. 1 is a navigational system structured flowchart in the prior art;
Fig. 2 is the process flow diagram of in the embodiment of the invention one original female database data being handled according to data layout;
Fig. 3 is a navigation server end workflow diagram in the embodiment of the invention two;
Fig. 4 is a navigation terminal workflow diagram in the embodiment of the invention three;
Fig. 5 be in the embodiment of the invention four at service end---the process flow diagram of the data difference update method of terminal;
Fig. 6 be in the embodiment of the invention five at service end the process flow diagram of the data difference update method of---desktop programs---terminal;
Fig. 7 is the system construction drawing of the embodiment of the invention.
Embodiment
The invention provides a kind of method and system of data difference update, can realize realizing the real-time update of map with less Data Update amount.
In the renewal process of map datum, relate to following data, promptly with respect to sometime, available data before changing and the latest data after the variation, the present invention will realize with latest data difference update available data.
Because via satellite or the data that obtain of other means all be the data of not passing through any processing, this paper is called original female database data with the data of any processing of this not process, no matter again because be available data or latest data, all obtain through transforming by original female database data, thereby at first need original female database data is transformed accordingly, make it meet the requirement of difference update.For the convenience of narrating, the original female database data after this paper will handle is called valid data.
Among the present invention, at first need original female database data is handled accordingly, make it to meet the requirement of difference update.
As shown in Figure 2, the embodiment of the invention one can be handled original female database data according to data layout, generates valid data.
Step 201: original female database data is converted to the data layout that is fit to the compiler compiling.
Described original female database data is via satellite or the data of not passing through any processing that obtain of other means.
Described data layout is the physical storage format of map datum, and specifying the physical storage format of map datum in fact is exactly to design a kind of data framework pattern.This data framework pattern should be finished the function that connects each other and compile between data dispatch, data buffering, deblocking, each blocks of data.Therefore, the data layout of setting should comprise the buffering method of data dispatch, data, size, the annexation between each blocks of data and the compiling flow process thereof of deblocking.
Step 202: from the extracting data desired data that transforms through data layout.
These data comprise: the current relation in road name, road shape, road attribute, number of track-lines, associated nodes, the speed of a motor vehicle, forbidden regulation, nodal community, node location, related highway section collection, related highway section etc., and these data are continuous.
Step 203: vehicle location (Vehicle Postion:VP) compiler will carry out the rectangle cutting through the continuous data of extracting, and the data boundary that cuts the back generation is carried out the border adjustment, generate block data.
Because the data that data portion is made are the original female database datas that comprise information of road surface, it is the continuous data of not passing through the initial sum termination in the expression path of cutting, and in the manufacturing process of map, map to be carried out the piecemeal cutting usually, this just need cut continuous data.
In compilation process, should avoid the adjusted data in border following situation to occur:
1. the rectangle drift angle is passed through in the highway section just
Disposal route: pass through a little should be to left down or the bottom right coordinate all be offset, make it apart from passing through NTU place of drift angle, pass through another rectangle piecemeal.
Table 3 table 4
Wherein, the rectangle drift angle is passed through in the highway section just in the table 3, will pass through a skew in the table 4, and the highway section is adjusted.
2, node is positioned on the rectangular edges boundary line just
Disposal route: the node that is positioned on the rectangular edges boundary line should be to NTU of the more rectangular block of link road hop count order skew, if the highway section linking number of two adjacent rectangular blocks is identical, then node to the right, offset downward.Need simultaneously to guarantee that the highway section can not overlap with the intersection point on rectangular block border.
Table 5 table 6
Wherein, table 5 node is positioned on the rectangular edges boundary line just, in the table 6 highway section is revised.
3, hitch point is on the rectangular edges boundary line:
Disposal route: node is to 1 NTU of place, highway section piece rollback.
Table 7 table 8
4, the highway section does not allow to overlap with square boundary:
Disposal route: the highway section is tilted to handle, and add a map sheet frontier point.
Table 9 table 10
Wherein, the highway section overlaps with square boundary in the table 9, in the table 10 highway section that originally overlaps with square boundary has been carried out tilting to handle.
Through rectangle cut apart, a series of separate block datas of output after the boundary treatment owing to all comprised in every block data owing to cut the block boundary attribute data that causes, thereby every block data is all by the node association.
Step 204: for every map datum is set block number.
Step 205:RC compiler extracts the data that path planning needs from described block data, generate the RC1 layer data.
Comprising: road associated nodes, road attribute, road section length etc.
Described RC1 layer data adopts identical method of partition with block data.
Step 206:RC compiler carries out screening, the splicing in highway section according to the RC1 layer data, generates the RC2 layer data, and in like manner, the RC2 layer data is carried out screening, the splicing in highway section, generates the RC3 layer data.
The route that includes different brackets such as expressway, one-level road, second grade highway, tertiary road, level Four road in the described RC1 layer data simultaneously.For convenience, consult a map intuitively, be necessary the RC1 layer data is screened.Through the RC1 layer data is screened, generate the RC2 layer data, comprise the route of expressway, one-level road, second grade highway, four grades of tertiary road in these data simultaneously.In like manner, to only including the route of expressway in the RC3 data that generate behind the RC2 data screening.
Step 207:RC compiler sorts block data according to block number to every block data format analysis processing, sets up index, block data is compiled according to data layout again, sets up the incidence relation tabulation of VP and RC.
Step 208: with the incidence relation list storage of VP and RC in the block data of VP, to every blocks of data format, according to order recording, data are connected in order, set up index, data compilation is become the data layout form, generate valid data.
The valid data that generate are kept in the VP compiler.
Among the present invention, include data item such as route calculation, road name, background in the described valid data, these valid data leave these data item in the different files in, like this, if a certain piecemeal valid data that upgrade are just when one or several in wherein the route calculation, road name, background rather than whole data item, only upgrade the data item that changes, do not need whole block data is all upgraded.
After original female database data handled through data layout, generate valid data, it is as follows to utilize described valid data to carry out the workflow of difference update.
For the convenience of narrating, below among the embodiment map datum be the valid data that obtain mentioned above.
Described workflow is divided into navigation server end workflow and navigation terminal workflow, respectively as shown in Figure 3 and Figure 4.
As shown in Figure 3, embodiment two, and navigation server end workflow is as follows:
Step 301: when map datum changes, according to the level of the map datum that changes and the positional information block number of diagram data definitely.
Step 302: the map data update module is upgraded this block number corresponding map data item, according to the temporal information of this moment corresponding map version number is set, and the updated map data form shfft is stored in the map data base.
As shown in Figure 4, embodiment three, and the navigation terminal workflow is as follows:
Step 401: map datum down loading updating module is determined the level and the position of required map datum to find its corresponding block number according to user's needs.
Step 402: map datum down loading updating module searches whether there is corresponding map datum in the map datum local cache according to this block number, if not then enter step 403, if having then enter step 404.
Step 403: by downloading these block number corresponding map data in the map data base of wireless telecommunications from navigation server.
Step 404: the map version number that reads this map datum, the map version number of these block number corresponding map data of inquiry in the map data base in navigation server, whether more described two map version numbers are consistent, if it is unanimity then enter step 405, if inconsistent then enter step 406.
Step 405: the existing map datum in the updating map data local cache not.
Step 406: with in the map data base to the map datum in should the map data update map datum local cache of block number.
Step 407: navigation module reads described block number corresponding map data and uses for the user from the map datum local cache.
In the said process, can realize according to following two kinds of difference update modes the map datum updating steps, be respectively service end---the data difference update method of data difference update method and service end---desktop programs---terminal of terminal, respectively as shown in Figure 5 and Figure 6.
As shown in Figure 5, the embodiment of the invention four is at service end---the introduction of the data difference update method of terminal.
Wherein, the data layout processing procedure of data is:
Step 501: up-to-date original female database data is provided.
Step 502:VP compiler extracts the data that change with reference to the method for partition and the block number thereof of existing valid data from female database data, generate more new data packets.
Step 503: the described data that change are handled according to data layout, be associated with existing valid data.
Include one or several data item such as route calculation, road name, background in the described data that change, these data item leave in the different files.
The difference update process of data is:
Step 504: the renewal data fusion that will handle through data layout in terminal generates and upgrades the back data in existing valid data.
Information such as the route calculation that valid data will wherein comprise after described renewal the, road name, background leave in the different files, like this, if a certain piecemeal valid data that upgrade are just when road information in wherein the route calculation, road name, background or several road informations wherein rather than whole road information, only upgrade the data item that changes, the store data items that is about to change does not need to upgrade whole block data in new data packets more.
The method is applicable to data content change frequency condition with higher, and as the renewal of POI data, the Data Update of road rule, the renewal frequency of these type of data is higher, is generally 0-1.Because this mode is only finished the merging of data dynamically in client, thereby, guaranteed to have reduced the integrality of data the pressure of navigation engine, and improved the performance of application program.
Difference update owing to data in the described method of the embodiment of the invention need be in terminal processes, and the system performance of terminal is limited, not as computer system has powerful data processing function, can not handle the data message of complicated topological structure such as relating to interpolation, deletion highway section, for overcoming this shortcoming, the frame mode of---desktop programs---terminal that can adopt service end is realized data difference update.
As shown in Figure 6, the embodiment of the invention five is introductions of the data difference update method of---desktop programs---terminal at service end.
Wherein, the data layout of data is treated to:
Step 601: up-to-date original female database data is provided.
Step 602:VP compiler extracts the data that change with reference to the method for partition and the block number thereof of existing valid data from female database data, generate more new data packets.
Step 603: the described data that change are handled according to data layout, be associated with existing valid data.
Include one or several data item such as route calculation, road name, background in the described data that change, these data item leave in the different files.
The difference update process of data is:
Step 604: the described data of user's download are to computing machine, the renewal data fusion that will handle through data layout in existing valid data, generate upgrade after data.
Step 605: will upgrade the back data and copy to terminal, terminal software starts once more, can use and upgrade the back data.
Information such as the route calculation that valid data will wherein comprise after described renewal the, road name, background leave in the different files, like this, if a certain piecemeal valid data that upgrade are just when road information in wherein the route calculation, road name, background or several road informations wherein rather than whole road information, only upgrade the data item that changes, the store data items that is about to change does not need to upgrade whole block data in new data packets more.
The method is applicable to the lower situation of data content change frequency, as the renewal of landmark data, the renewal of first-class road data.The renewal frequency of these type of data is lower, is generally 2-3.Because this mode do not need to change available data, promptly need data updated to separate with available data, thereby, can compress with the minimizing data space available data, and diagram data initially can be stored on the curing medium, as CD.
Simultaneously, in the embodiment of the invention four and embodiment five, do not have the Overlayer layer that exists between piece adjacent in the prior art and the piece, thereby when map datum took place to upgrade, the data updated amount was less.
More than be introduction, will introduce the system embodiment of data difference update below the method for data difference update.
With reference to Fig. 7, the system chart of the embodiment of the invention below is described, comprising:
Format processing unit 701: be used for from female database data, extracting the map datum that changes through formaing the method for partition and the block number thereof of the map datum of handling, format processing with reference to existing.
Storage unit 702: be used for the map datum item that described map datum includes block number, route calculation, road name, background, different map datum items is left in the different files;
Updating block 703: be used for according to block number, upgrade existing map datum item with the map datum item that changes.
Utilize the present invention that information such as the route calculation in the described every valid data, road name, background are all left in the different files, like this, if a certain valid data that upgrade are just when one or several in wherein the route calculation, road name, background rather than whole road information, only upgrade the data that change, do not need whole block data is all upgraded, thereby, the real-time update of map datum can be realized realizing, a large amount of internal memory of system needn't be taken with less Data Update.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. the method for a data difference update is characterized in that, comprising:
From female database data, extract the map datum item that changes with reference to existing through formaing the method for partition and the block number thereof of the map datum of handling, format processing;
Different map datum items is left in the different files;
According to block number, upgrade existing map datum item with the map datum item that changes.
2. method according to claim 1 is characterized in that, comprising:
Described method of partition is rectangle method of partition or coupling non-rectangle method of partition.
3. method according to claim 1 is characterized in that, the specific implementation of described method of partition is:
When the rectangle drift angle was passed through in the highway section just, passing through a little should be to left down or the bottom right coordinate offset.
4. method according to claim 2 is characterized in that, the specific implementation of described method of partition is:
When node passes through the rectangular edges boundary line just, the node that is positioned on the rectangular edges boundary line should be to the more rectangular block skew of link road hop count order, when the highway section of adjacent rectangle piece linking number is identical, node to the right, offset downward, and guarantee that the highway section does not overlap with the intersection point on rectangular block border.
5. method according to claim 1 is characterized in that, the specific implementation of described method of partition is:
When hitch point was positioned on the rectangular edges boundary line, node was return to the place piecemeal.
6. method according to claim 1 is characterized in that, the specific implementation of described method of partition is:
When the highway section overlaps with square boundary, the highway section is tilted to handle, and add a map sheet frontier point.
7. method according to claim 1 is characterized in that,
It is that the RC compiler formats processing to every block data that described format is handled.
8. method according to claim 1 is characterized in that, and is described according to block number, and the specific implementation of upgrading existing map datum item with the map datum item that changes is:
According to block number,, upgrade existing map datum item with the map datum item that changes in terminal.
9. method according to claim 1 is characterized in that, and is described according to block number, and the specific implementation of upgrading existing map datum item with the map datum item that changes is:
The map datum item that changes is downloaded in the map datum process software,,, and copy to terminal with the existing map datum item of map data update that changes according to block number.
10. the system of a data difference update is characterized in that, comprising:
Format processing unit: be used for from female database data, extracting the map datum that changes through formaing the method for partition and the block number thereof of the map datum of handling, format processing with reference to existing;
Storage unit: be used for the map datum item that described map datum includes block number, route calculation, road name, background, different map datum items is left in the different files;
Updating block: be used for according to block number, upgrade existing map datum item with the map datum item that changes.
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| CN106776635A (en) * | 2015-11-24 | 2017-05-31 | 北京国双科技有限公司 | The update method and device of knowledge database data |
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