CN102368259A - Electronic map data storage and query method, device and system - Google Patents
Electronic map data storage and query method, device and system Download PDFInfo
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Abstract
The invention discloses an electronic map data storage and query method, device and system. The electronic map data storage and query method comprises the following steps of: grading the map source data into a plurality of grades according to the sizes of proportional scales, and setting a proportional scale grade threshold; storing the map data, of which the proportional scale grade is not higher than the threshold, according to a raster data format; and storing the map data, of which the proportional scale grade is higher than the threshold, according to a vector data format. In the technical scheme provided by the embodiment of the invention, the map data is stored according to two modes including a raster data mode and a vector data mode, so as to give consideration to the requirements on two aspects of exhibition effect and performance of the electronic map on a mobile terminal.
Description
Technical field
The application relates to the electronic map technique field, particularly relates to electronic map data storage and querying method, Apparatus and system.
Background technology
Electronic chart is also claimed numerical map, is to utilize computer technology, with the map of digital form storage and inquiry.Compare with traditional paper map, the making of electronic chart, management, reading and use can realize integrated, are convenient to make amendment in real time; Utilize the data query ability of computing machine, electronic chart can be realized more quick and diversified inquiry mode, is user-friendly to.In addition, electronic chart can carry out factor combination, the splicing of arbitrary form easily to the content of general map, form new map, and can synthesize the information of types such as image, sound and literal and be in the same place, and realizes multiple bandwagon effect.
At present, electronic map data mainly contains two kinds of data storage methods, is respectively according to the raster data format with according to the vector data format.Grid map is claimed bitmap again, generally is used for the Flame Image Process of photograph quality, the figure of being made up of many pixels.As far as grid map, the parameter of of paramount importance parameter is a resolution, and operation is during grid map, and the quality that resolution both can influence last output also can influence the size of file.For for the map of grid map format, when needs carry out amplifieroperation to map, can cause the distortion of original image; Therefore in order to guarantee display effect; For the identical zone of actual geographic areas, engineer's scale is big more, needs the grid map quantity of storage also to want corresponding increase.
The mode of another kind of storing electronic map data is according to the vector data format.Vector image is also referred to as OO image, on mathematics, is defined as a series of points that connected by line.Graphic element in the vector file is called object.Each object all is an entity that has a style of one's own, and it has attributes such as color, shape, profile, size and screen position.Since each object all is an entity that has a style of one's own, just can when keep its original sharpness and flexibility, repeatedly move and change its attribute, and can not influence other object in the legend.Map based on the vector format storage is irrelevant with resolution; This means that they can be shown on the output device by highest resolution; On map vector, the user can realize operating more flexibly, and these operations can not cause the distortion of output map image.
Along with the development of terminal technology, the electronic chart function can realize on portable mobile termianls such as mobile phone.Therefore the limited storage space of portable terminal, network traffic data also can link directly with expense, when using the electronic chart function, no matter are in this machine storage data, still obtain data on line immediately, and the size of data volume is all had higher requirement.Because the preservation of polar plot and modification are not to be the basis with the pixel, but are the basis with object and mathematics drawing command.For this big data quantity of electronic chart is used, adopt the vector data storage mode need not store a large amount of data bitmaps, can satisfy the requirement of portable terminal preferably for map datum amount size.
Different with raster data is, obtains after the vector data, also needs further play up the image of computing finally to be used to show to vector data, and this handling property to the terminal is also had higher requirement.In addition, power problems also is the problem that the required emphasis of portable terminal is considered, a large amount of plays up the increase that computing must cause power consumption of terminal.
It is thus clear that existing two kinds of map datum storage modes when being applied to portable terminal, all exist defective separately respectively.
Summary of the invention
For solving the problems of the technologies described above, the application embodiment provides a kind of electronic map data storage and querying method, Apparatus and system, and to satisfy on portable terminal the requirement aspect electronic chart bandwagon effect and the performance two, the present techniques scheme is following:
The application provides a kind of electronic map data storage means, comprising:
In advance with the map source data proportionally the chi size be divided into a plurality of ranks, and set an engineer's scale grade threshold;
The map datum that the engineer's scale grade is not higher than said threshold value is with the raster data format;
The map datum that the engineer's scale grade is higher than said threshold value is with the vector data format.
In a kind of implementation of the application, said method also comprises:
Map datum to the different brackets engineer's scale is set up index respectively;
With the engineer's scale grade is sign, obtains map data file after the map datum of each grade engineer's scale and index are merged.
In a kind of implementation of the application, the said map datum that the engineer's scale grade is not higher than said threshold value comprises with the raster data format:
Be not higher than the engineer's scale grade of said threshold value for each, respectively the storage raster data corresponding with this grade.
In a kind of implementation of the application, the said map datum that the engineer's scale grade is higher than said threshold value comprises with the vector data format:
For the engineer's scale grade that is higher than said threshold value more than two, as sign, use identical vector data to store with different engineer's scale grades.
In a kind of implementation of the application, the said map datum that the engineer's scale grade is higher than said threshold value also comprises with the vector data format:
For the map datum of different proportion chi grade, the different place identification information of the corresponding engineer's scale class stores of difference.
In a kind of implementation of the application, before the map datum that the engineer's scale grade is not higher than said threshold value is with the raster data format, also comprise:
Utilize map source data medium scale grade not to be higher than the vector data of said threshold value, draw out the raster data of corresponding proportion chi grade.
The application provides a kind of electronic map data querying method, comprising:
Receive user's map datum query requests, carry engineer's scale class information and geographical location information in the said query requests;
According to said engineer's scale class information, whether the engineer's scale grade that the interpretation user is asked is higher than preset engineer's scale grade threshold;
If, then, obtain corresponding vector data, and utilize vector data to draw out raster data according to said engineer's scale class information and geographical location information, drawing result is returned to the user as Query Result;
If not, then, obtain corresponding raster data, the raster data that is obtained returned to the user as Query Result according to said engineer's scale class information and geographical location information.
In a kind of implementation of the application, said vector data and raster data are sign with the engineer's scale grade, are stored in the map data file.
In a kind of implementation of the application, saidly obtain corresponding vector data according to said engineer's scale class information and geographical location information, comprising:
According to said engineer's scale class information, in map data file, confirm the corresponding vector data layer of engineer's scale grade of being asked with the user;
According to the data directory of vector data layer, obtain the corresponding vector data of geographical location information of being asked with the user.
In a kind of implementation of the application, obtain after the corresponding vector data of the geographical location information of being asked with the user, also comprise:
Obtain and the corresponding place of geographical location information identification information, said place identification information is used for the drafting of raster data.
In a kind of implementation of the application, saidly obtain corresponding raster data according to said engineer's scale class information and geographical location information, comprising:
According to said engineer's scale class information, in map data file, confirm the corresponding raster data layer of engineer's scale grade of being asked with the user;
According to the data directory of raster data layer, obtain the corresponding raster data of geographical location information of being asked with the user.
The application provides a kind of electronic map data memory storage, comprising::
Pretreatment unit, be used in advance with the map source data proportionally the chi size be divided into a plurality of ranks, and set an engineer's scale grade threshold;
The raster data storage unit, the map datum that is used for the engineer's scale grade is not higher than said threshold value is with the raster data format;
The vector data storage unit, the map datum that is used for the engineer's scale grade is higher than said threshold value is with the vector data format.
In a kind of implementation of the application, said apparatus also comprises:
Indexing units is used for the map datum of different brackets engineer's scale is set up index respectively;
Merge cells, being used for the engineer's scale grade is sign, obtains map data file after the index that the map datum of each grade engineer's scale and said indexing units are set up merges.
In a kind of implementation of the application, said raster data storage unit concrete configuration is:
Be not higher than the engineer's scale grade of said threshold value for each, respectively the storage raster data corresponding with this grade.
In a kind of implementation of the application, said vector data storage unit concrete configuration is:
For the engineer's scale grade that is higher than said threshold value more than two, as sign, use identical vector data to store with different engineer's scale grades.
In a kind of implementation of the application, said vector data storage unit further is configured to:
Be used for map datum, respectively the different place identification information of corresponding engineer's scale class stores for different proportion chi grade.
In a kind of implementation of the application, said device also comprises:
The raster data drawing unit is used to utilize map source data medium scale grade not to be higher than the vector data of said threshold value, draws out the raster data of corresponding proportion chi grade, and the raster data of being drawn out is used for said raster data storage unit and stores.
The application provides a kind of electronic map data inquiry unit, comprising:
The query requests receiving element is used to receive user's map datum query requests, carries engineer's scale class information and geographical location information in the said query requests;
Engineer's scale grade judging unit is used for according to said engineer's scale class information, and whether the engineer's scale grade that the interpretation user is asked is higher than preset engineer's scale grade threshold;
The first inquiry response unit; The judged result that is used at said engineer's scale grade judging unit is under the situation that is; According to said engineer's scale class information and geographical location information; Obtain corresponding vector data, and utilize the vector data that is obtained to draw out raster data, drawing result is returned to the user as Query Result;
The second inquiry response unit; The judged result that is used at said engineer's scale grade judging unit is under the situation not; According to said engineer's scale class information and geographical location information, obtain corresponding raster data, the raster data that is obtained is returned to the user as Query Result.
In a kind of implementation of the application, said vector data and raster data are sign with the engineer's scale grade, are stored in the map data file.
In a kind of implementation of the application, the said first inquiry response unit comprises:
The vector data layer is confirmed subelement, is used for according to said engineer's scale class information, in map data file, confirms the corresponding vector data layer of engineer's scale grade of being asked with the user;
Vector data obtains subelement, is used for the data directory according to the vector data layer, obtains the corresponding vector data of geographical location information of being asked with the user;
The first response subelement is used to utilize said vector data to obtain the vector data that subelement obtains and draws out raster data, and drawing result is returned to the user as Query Result.
In a kind of implementation of the application, the said first inquiry response unit also comprises:
Identification information obtains subelement, is used to obtain and the corresponding place of geographical location information identification information, and said place identification information is used for the said first response subelement and carries out the drafting of raster data.
In a kind of implementation of the application, the said second inquiry response unit comprises:
The raster data layer is confirmed subelement, is used for according to said engineer's scale class information, in map data file, confirms the corresponding raster data layer of engineer's scale grade of being asked with the user;
Raster data obtains subelement, is used for the data directory according to the raster data layer, obtains the corresponding raster data of geographical location information of being asked with the user;
The first response subelement is used for that said raster data is obtained the raster data that subelement obtains and returns to the user as Query Result.
The application provides a kind of electronic map system, comprises foregoing electronic map data memory storage and foregoing electronic map data inquiry unit
The technical scheme that the application embodiment provided, in conjunction with raster data and vector data dual mode map datum is stored.Data characteristic according to the map, data volume and the requirement of display effect all increased along with the increase of engineer's scale is therefore for the large-scale map data; Adopt the vector data form to store; So that the details of viewing area simultaneously, is avoided the grid map data of storing excess better; And for the small scale map data; Itself data volume obviously reduces compared to the large-scale map data; And to display effect require relatively lowly, therefore adopt the raster data form to store, play up speed thereby improve image; And reduce demand, reach the purpose that reduces mobile terminal power consumption the system handles resource.
Description of drawings
In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously; The accompanying drawing that describes below only is some embodiment that put down in writing among the application, for those of ordinary skills, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of the application embodiment electronic map data storage means;
Fig. 2 is the application embodiment engineer's scale grade classification mode synoptic diagram;
Fig. 3 is the another kind of process flow diagram of the application embodiment electronic map data storage means;
Fig. 4 is the application embodiment map datum piecemeal synoptic diagram;
Fig. 5 is the data structure synoptic diagram in the application embodiment 8 * 8 zones;
Shown in Figure 6 is the logical organization synoptic diagram of the application embodiment map data file;
Fig. 7 is the process flow diagram of the application embodiment electronic map data querying method;
Fig. 8 is a kind of structural representation of the application embodiment electronic map data memory storage;
Fig. 9 is second kind of structural representation of the application embodiment electronic map data memory storage;
Figure 10 is the third structural representation of the application embodiment electronic map data memory storage;
Figure 11 is a kind of structural representation of the application embodiment electronic map data inquiry unit;
Figure 12 is a kind of structural representation of the application embodiment electronic map system.
Embodiment
The electronic map data storage means and the querying method that at first the application embodiment are provided describe:
Wherein, the electronic map data storage means can may further comprise the steps:
In advance with map datum proportionally the chi size be divided into a plurality of ranks, and set an engineer's scale grade threshold;
The map datum that the engineer's scale grade is not higher than said threshold value is with the raster data format;
The map datum that the engineer's scale grade is higher than said threshold value is with the vector data format.
The electronic map data querying method that the application embodiment provided can may further comprise the steps:
Receive user's map datum query requests, carry engineer's scale class information and geographical location information in the said query requests;
According to said engineer's scale class information, whether the engineer's scale grade that the interpretation user is asked is higher than preset engineer's scale grade threshold;
If, then, obtain corresponding vector data, and utilize vector data to draw out raster data according to said engineer's scale class information and geographical location information, drawing result is returned to the user as Query Result;
If not, then, obtain corresponding raster data, the raster data that is obtained returned to the user as Query Result according to said engineer's scale class information and geographical location information.
The above-mentioned method that provides, in conjunction with raster data and vector data dual mode map datum is stored.Data characteristic according to the map, data volume and the requirement of display effect all increased along with the increase of engineer's scale is therefore for the large-scale map data; Adopt the vector data form to store; So that the details of viewing area simultaneously, is avoided the grid map data of storing excess better; And for the small scale map data; Itself data volume obviously reduces compared to the large-scale map data; And to display effect require relatively lowly, therefore adopt the raster data form to store, play up speed thereby improve image; And reduce demand, reach the purpose that reduces mobile terminal power consumption the system handles resource.
In order to make those skilled in the art person understand the technical scheme among the application better; To combine the accompanying drawing among the application embodiment below; Technical scheme among the application embodiment describes in detail; Obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, the every other embodiment that those of ordinary skills obtained should belong to the scope that the application protects.
Shown in Figure 1ly be the process flow diagram of the electronic map data storage means that the application provided, can may further comprise the steps:
S101, in advance with the map source data proportionally the chi size be divided into a plurality of ranks, and set an engineer's scale grade threshold;
S102, the map datum that the engineer's scale grade is not higher than said threshold value is with the raster data format;
S103, the map datum that the engineer's scale grade is higher than said threshold value is with the vector data format.
The present techniques scheme; Be that hypothesis has had sufficient map source data before carrying out said method; Wherein, Step S102 and S103 store the map source data with raster data and vector data dual mode respectively, so the execution of these two steps, can not distinguish sequencing.
In the application of reality; The map source data that data provider provided generally all is a vector data; In this case, the data that the engineer's scale grade is not higher than threshold value are vector format, therefore before execution in step S102; Also need utilize the vector data of this part engineer's scale to draw out corresponding raster data earlier, and then carry out S102 and store.
Shown in Figure 2 is a kind of concrete engineer's scale grade classification mode synoptic diagram of the application embodiment, and the map source data is the vector data of map of China, and it is 18 grades that engineer's scale is divided into by size, and wherein the 18th grade is high scale grade, and the engineer's scale size is 1: 1; The 18th grade is time high scale grade, and the engineer's scale size is 1: 2, by that analogy ..., in the present embodiment, minimum engineer's scale grade is 3 grades, the engineer's scale size is 1: 32768.Here the unit of engineer's scale is pixel/rice, and the details of concrete every grade of engineer's scale can be referring to shown in the table 1:
| The engineer's scale grade | Engineer's scale (pixel/rice) |
| Engineer's |
1∶131072 |
| Engineer's |
1∶65536 |
| Engineer's |
1∶32768 |
| Engineer's |
1∶16384 |
| Engineer's |
1∶8192 |
| Engineer's |
1∶4096 |
| Engineer's |
1∶2048 |
| Engineer's |
1∶1024 |
| Engineer's |
1∶512 |
| Engineer's scale 10 | 1∶256 |
| Engineer's scale 11 | 1∶128 |
| Engineer's scale 12 | 1∶64 |
| Engineer's scale 13 | 1∶32 |
| Engineer's scale 14 | 1∶16 |
| Engineer's scale 15 | 1∶8 |
| Engineer's scale 16 | 1∶4 |
| Engineer's scale 17 | 1∶2 |
| Engineer's scale 18 | 1∶1 |
Table 1
With engineer's scale grade 14 is example, and its engineer's scale size is 1: 8, that is to say that the length of a pixel of on map image, being showed is equivalent to 8 meters in the actual geographic distance.
Need to prove 1 grade and 2 grades of engineer's scales employings in the present embodiment in the table 1.
In the present embodiment; Choose grade 12 and be the ratio grade threshold, the data that are higher than 12 grades will be stored with the vector data form, relate to 13-18 totally 6 grades; Data below 12 grades and 12 grades will be stored with the raster data form, relate to 3-12 totally 10 grades.
Wherein, raster data is appreciated that the photo of taking for to actual geographic area, in order to guarantee the map image quality and to realize reading fast, can all store corresponding raster data for each engineer's scale grade.In the present embodiment, need all store with the raster data form respectively the data of 3-12 level engineer's scale.According to the explanation of front, each grade raster data can be drawn by vector data and obtain.
For vector data; Because vector data essence is the information of some point-line-surfaces; Can not receive the influence of resolution based on the ground plot quality of vector format storage, so, can use same group of vector data to store for a plurality of engineer's scale grades that are higher than the engineer's scale threshold value.In the present embodiment, the same group of vector data of The data with 13-15 level engineer's scale is stored as a data Layer; Same group of vector data of The data with 16-18 level engineer's scale is stored as a data Layer.In each data Layer, identify in order to distinguish with different engineer's scale grades.
In addition, for the display effect that makes map more meets user's the demand of browsing, under different engineer's scale grades; The detailed degree of the identification information that on map, is represented is different; For example, under 1: 4 engineer's scale, only can show the information of block in a big way; And under 1: 1 engineer's scale, the information of maybe some floor areas very little buildings can show that also simultaneously, the identification information of some larger area scopes (for example province, city) need not show under large-scale map.In a word; It is different under each engineer's scale grade, needing the corresponding place identification information that shows; Therefore, for using the map datum of a plurality of engineer's scale grades of data storage on the same group, can distinguish the different place identification information of corresponding engineer's scale class stores; Show so that when displayed map, take out corresponding place identification information, realize better display effect to different engineer's scales.
The application embodiment final data storage organization example can be referring to shown in the table 2, and wherein data Layer 0 is the vector data layer with data Layer 1, and all the other are the raster data layer.Corresponding 3 the engineer's scale grade of each vector data layer are defined as sub-engineer's scale 0, sub-engineer's scale 1, sub-engineer's scale 2 respectively; Corresponding 1 the engineer's scale grade of each raster data layer all is defined as sub-engineer's scale 0.
Table 2
In the application's another kind of embodiment, can also be further the map datum with each engineer's scale grade of different-format storage be incorporated in the same map file, referring to shown in Figure 3, after step S103, can further include:
S104 sets up index respectively to the map datum of different brackets engineer's scale;
S105 is a sign with the engineer's scale grade, obtains map data file after the map datum of each grade engineer's scale and index are merged.
Still combine concrete embodiment below, said method described:
At first the physical arrangement of the application embodiment map data file is carried out simple declaration, on the whole, raster data and vector data all are to distinguish according to data Layer to store.
With 18 grades of maximum ratio chis is example, and the vector data bag to the piecemeal principle of map datum is:
One-level: 40 * 40, each piecemeal is called BlockSet;
Secondary: 8 * 8, each piecemeal is called Block;
Three grades: 8 * 8, each piecemeal is called Parcel;
Level Four: 8 * 8, each piecemeal is called BlockUnite;
Above-mentioned partitioned mode can be referring to shown in Figure 4.For other engineer's scale grade, the piecemeal principle can define flexibly.
Shown in Figure 5 is the data structure synoptic diagram in a level Four 8 * 8 zones; The position of the piecemeal of this Figure 64 is corresponding to the geographic area of reality; By that analogy; 64 level Four zones as shown in Figure 4 can constitute a tertiary zone, and 64 tertiary zone can constitute a level-2 area, and 1600 level-2 areas can constitute a level-1 area.
Under the 18th grade of engineer's scale; Mercator's scope of a level Four grid BlockUnite is 1024 * 1024, is 1024 * 8 * 8 * 8=524288 by calculating the length that can get each BlockSet, supposes for Mercator's coordinate points [12345678; 10003000], its first order indexed data is:
BlocksetXoff＝12345678/524288＝23
BlocksetYoff＝10003000/524288＝19
BlocksetIndex＝19*39+23＝764
In order to consider to dynamically update, and full index takes up space greatlyyer, and second level index Parcel data, third level index Parcel data and fourth stage index BlockUnite data are not full index.Therefore do not calculate side-play amount through spatial index, can be according to the side-play amount and this index inner space indexed addressing of upper strata index record.
In the storing process of reality, at first the map source data is carried out cutting, project to respectively in each piece according to the geographic area coordinate and store, through above indexed mode all piecemeals are identified then.Like this, each piecemeal is the geographic location and the skew of the memory location in data file of a corresponding reality all, according to the corresponding relation generation index of geographic location and memory location skew.When inquiring about, the user can provide the geographical position coordinates of will inquiring about, and through index, just can find corresponding data storage location, obtains the map datum of this position.
Below only describe with 18 grades of scale numbers certificates, for the engineer's scale (comprising raster data and vector data) of other grades, the partitioned mode of data maybe be different, but the mode of the rule of index and addressing all is consistent.After the data processing of all grade engineer's scales finished; Can use the engineer's scale grade to be sign; Obtain map data file after the map datum of each grade engineer's scale and index merged, shown in Figure 6 is the logical organization synoptic diagram of a kind of map data file of the application embodiment.
Corresponding to above-mentioned electronic map data storage means, the application embodiment also provides a kind of electronic map data querying method, referring to shown in Figure 7, may further comprise the steps:
S201, reception user's map datum query requests is carried engineer's scale class information and geographical location information in the said query requests;
S202, according to said engineer's scale class information, whether the engineer's scale grade that the interpretation user is asked is higher than preset engineer's scale grade threshold; If carry out S203, otherwise carry out S204;
S203 according to said engineer's scale class information and geographical location information, obtains corresponding vector data, and utilizes vector data to draw out raster data, and drawing result is returned to the user as Query Result;
S204 according to said engineer's scale class information and geographical location information, obtains corresponding raster data, and the raster data that is obtained is returned to the user as Query Result.
Wherein, vector data and raster data can be sign with the engineer's scale grade, are stored in the identical map data file.
Still the example with the front describes; The user is when carrying out map inquiry, and the basic query condition that need provide comprises engineer's scale class information and geographical location information, anyly in the corresponding practical operation once drags, zoom operations; All should think to have submitted to different engineer's scale class information and geographical location information; System confirms the mode to user's return data at first according to the engineer's scale class information
In the present embodiment, if the engineer's scale grade of user's request is then obtained corresponding vector data, and utilized vector data to draw out raster data greater than 12, drawing result is returned to the user as Query Result; Wherein, the method for obtaining vector data can comprise:
S203a according to said engineer's scale class information, confirms the corresponding vector data layer of engineer's scale grade of being asked with the user in map data file;
S203b according to the data directory of vector data layer, obtains the corresponding vector data of geographical location information of being asked with the user.
Further; If when carrying out data storage; Use on the same group vector data to store the map datum of a plurality of engineer's scale grades; And respectively corresponding engineer's scale class stores different place identification informations, then when inquiry, can also further obtain under institute's inquiry engineer's scale grade with the corresponding place of geographical location information identification information, the follow-up drafting that will be used for raster data of these place identification informations.Show so that when displayed map, take out corresponding place identification information, realize better display effect to different engineer's scales.
If the engineer's scale grade of user's request is then obtained corresponding raster data, and raster data is directly returned to the user as Query Result smaller or equal to 12.Wherein, the method for obtaining raster data can comprise:
S204a according to said engineer's scale class information, confirms the corresponding raster data layer of engineer's scale grade of being asked with the user in map data file;
S204b according to the data directory of raster data layer, obtains the corresponding raster data of geographical location information of being asked with the user.
The above-mentioned method that provides, in conjunction with raster data and vector data dual mode map datum is stored.Data characteristic according to the map, data volume and the requirement of display effect all increased along with the increase of engineer's scale is therefore for the large-scale map data; Adopt the vector data form to store; So that the details of viewing area simultaneously, is avoided the grid map data of storing excess better; And for the small scale map data; Itself data volume obviously reduces compared to the large-scale map data; And to display effect require relatively lowly, therefore adopt the raster data form to store, play up speed thereby improve image; And reduce demand, reach the purpose that reduces mobile terminal power consumption the system handles resource.
Corresponding to top method embodiment, the application also provides a kind of electronic map data memory storage, referring to shown in Figure 8, comprising:
Raster data storage unit 320, the map datum that is used for the engineer's scale grade is not higher than said threshold value is with the raster data format;
Vector data storage unit 330, the map datum that is used for the engineer's scale grade is higher than said threshold value is with the vector data format.
Wherein, said raster data storage unit 320 can concrete configuration be:
Be not higher than the engineer's scale grade of said threshold value for each, respectively the storage raster data corresponding with this grade.
Said vector data storage unit 330 can concrete configuration be:
For the engineer's scale grade that is higher than said threshold value more than two, as sign, use identical vector data to store with different engineer's scale grades.
In a kind of embodiment of the application, said vector data storage unit 330 can also further be configured to:
Be used for map datum, respectively the different place identification information of corresponding engineer's scale class stores for different proportion chi grade.
Referring to shown in Figure 9, the map datum memory storage that the application embodiment provides can further include:
Merge cells 350, being used for the engineer's scale grade is sign, obtains map data file after the index that the map datum of each grade engineer's scale and said indexing units are set up merges.
In the application of reality; The map source data that data provider provided generally all is a vector data; In this case, the data that the engineer's scale grade is not higher than threshold value are vector format, therefore also need utilize the vector data of this part engineer's scale to draw out corresponding raster data earlier; Referring to shown in Figure 10, the map datum memory storage that the application embodiment provides can further include:
Raster data drawing unit 360 is used to utilize map source data medium scale grade not to be higher than the vector data of said threshold value, draws out the raster data of corresponding proportion chi grade, and the raster data of being drawn out is used for said raster data storage unit and stores.
The application embodiment also provides a kind of electronic map data inquiry unit, referring to shown in Figure 11, comprising:
Query requests receiving element 410 is used to receive user's map datum query requests, carries engineer's scale class information and geographical location information in the said query requests;
Engineer's scale grade judging unit 420 is used for according to said engineer's scale class information, and whether the engineer's scale grade that the interpretation user is asked is higher than preset engineer's scale grade threshold;
The first inquiry response unit 430; The judged result that is used at said engineer's scale grade judging unit is under the situation that is; According to said engineer's scale class information and geographical location information; Obtain corresponding vector data, and utilize the vector data that is obtained to draw out raster data, drawing result is returned to the user as Query Result;
The second inquiry response unit 440; The judged result that is used at said engineer's scale grade judging unit is under the situation not; According to said engineer's scale class information and geographical location information, obtain corresponding raster data, the raster data that is obtained is returned to the user as Query Result.
In a kind of embodiment of the application, said vector data and raster data can be sign with the engineer's scale grade, are stored in the map data file, supply said electronic map data inquiry unit to inquire about.
Wherein, the said first inquiry response unit 430 specifically can comprise:
The vector data layer is confirmed subelement, is used for according to said engineer's scale class information, in map data file, confirms the corresponding vector data layer of engineer's scale grade of being asked with the user;
Vector data obtains subelement, is used for the data directory according to the vector data layer, obtains the corresponding vector data of geographical location information of being asked with the user;
The first response subelement is used to utilize said vector data to obtain the vector data that subelement obtains and draws out raster data, and drawing result is returned to the user as Query Result.
Further, the said first inquiry response unit can also comprise:
Identification information obtains subelement, is used to obtain and the corresponding place of geographical location information identification information, and said place identification information is used for the said first response subelement and carries out the drafting of raster data.
Wherein, the said second inquiry response unit 440 specifically can comprise:
The raster data layer is confirmed subelement, is used for according to said engineer's scale class information, in map data file, confirms the corresponding raster data layer of engineer's scale grade of being asked with the user;
Raster data obtains subelement, is used for the data directory according to the raster data layer, obtains the corresponding raster data of geographical location information of being asked with the user;
The first response subelement is used for that said raster data is obtained the raster data that subelement obtains and returns to the user as Query Result.
The application embodiment also provides a kind of electronic map system; Referring to shown in Figure 12; It comprises memory storage 510 and inquiry unit 520; Wherein, memory storage 510 and inquiry unit 520 are respectively like aforesaid electronic map data memory storage and electronic map data inquiry unit, no longer repeat specification here.
Device that the application embodiment provided and system, in conjunction with raster data and vector data dual mode map datum is stored.Data characteristic according to the map, data volume and the requirement of display effect all increased along with the increase of engineer's scale is therefore for the large-scale map data; Adopt the vector data form to store; So that the details of viewing area simultaneously, is avoided the grid map data of storing excess better; And for the small scale map data; Itself data volume obviously reduces compared to the large-scale map data; And to display effect require relatively lowly, therefore adopt the raster data form to store, play up speed thereby improve image; And reduce demand, reach the purpose that reduces mobile terminal power consumption the system handles resource.
For the convenience of describing, be divided into various unit with function when describing above the device and describe respectively.Certainly, when implementing the application, can in same or a plurality of softwares and/or hardware, realize the function of each unit.
Description through above embodiment can know, those skilled in the art can be well understood to the application and can realize by the mode that software adds essential general hardware platform.Based on such understanding; The part that the application's technical scheme contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product can be stored in the storage medium, like ROM/RAM, magnetic disc, CD etc., comprises that some instructions are with so that a computer equipment (can be a personal computer; Server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the application or embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses all is the difference with other embodiment.Especially, for device or system embodiment, because it is basically similar in appearance to method embodiment, so describe fairly simplely, relevant part gets final product referring to the part explanation of method embodiment.Apparatus and system embodiment described above only is schematic; Wherein said unit as the separating component explanation can or can not be physically to separate also; The parts that show as the unit can be or can not be physical locations also; Promptly can be positioned at a place, perhaps also can be distributed on a plurality of NEs.Can realize the purpose of present embodiment scheme according to the needs selection some or all of module wherein of reality.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
The above only is the application's a embodiment; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the application's protection domain.
Claims (23)
1. an electronic map data storage means is characterized in that, comprising:
In advance with the map source data proportionally the chi size be divided into a plurality of ranks, and set an engineer's scale grade threshold;
The map datum that the engineer's scale grade is not higher than said threshold value is with the raster data format;
The map datum that the engineer's scale grade is higher than said threshold value is with the vector data format.
2. method according to claim 1 is characterized in that, also comprises:
Map datum to the different brackets engineer's scale is set up index respectively;
With the engineer's scale grade is sign, obtains map data file after the map datum of each grade engineer's scale and index are merged.
3. method according to claim 1 is characterized in that, the said map datum that the engineer's scale grade is not higher than said threshold value comprises with the raster data format:
Be not higher than the engineer's scale grade of said threshold value for each, respectively the storage raster data corresponding with this grade.
4. method according to claim 1 is characterized in that, the said map datum that the engineer's scale grade is higher than said threshold value comprises with the vector data format:
For the engineer's scale grade that is higher than said threshold value more than two, as sign, use identical vector data to store with different engineer's scale grades.
5. method according to claim 4 is characterized in that, the said map datum that the engineer's scale grade is higher than said threshold value also comprises with the vector data format:
For the map datum of different proportion chi grade, the different place identification information of the corresponding engineer's scale class stores of difference.
6. method according to claim 1 is characterized in that, before the map datum that the engineer's scale grade is not higher than said threshold value is with the raster data format, also comprises:
Utilize map source data medium scale grade not to be higher than the vector data of said threshold value, draw out the raster data of corresponding proportion chi grade.
7. an electronic map data querying method is characterized in that, comprising:
Receive user's map datum query requests, carry engineer's scale class information and geographical location information in the said query requests;
According to said engineer's scale class information, whether the engineer's scale grade that the interpretation user is asked is higher than preset engineer's scale grade threshold;
If, then, obtain corresponding vector data, and utilize vector data to draw out raster data according to said engineer's scale class information and geographical location information, drawing result is returned to the user as Query Result;
If not, then, obtain corresponding raster data, the raster data that is obtained returned to the user as Query Result according to said engineer's scale class information and geographical location information.
8. method according to claim 7 is characterized in that, said vector data and raster data are sign with the engineer's scale grade, are stored in the map data file.
9. method according to claim 8 is characterized in that, saidly obtains corresponding vector data according to said engineer's scale class information and geographical location information, comprising:
According to said engineer's scale class information, in map data file, confirm the corresponding vector data layer of engineer's scale grade of being asked with the user;
According to the data directory of vector data layer, obtain the corresponding vector data of geographical location information of being asked with the user.
10. method according to claim 9 is characterized in that, obtains after the corresponding vector data of the geographical location information of being asked with the user, also comprises:
Obtain and the corresponding place of geographical location information identification information, said place identification information is used for the drafting of raster data.
11. method according to claim 8 is characterized in that, saidly obtains corresponding raster data according to said engineer's scale class information and geographical location information, comprising:
According to said engineer's scale class information, in map data file, confirm the corresponding raster data layer of engineer's scale grade of being asked with the user;
According to the data directory of raster data layer, obtain the corresponding raster data of geographical location information of being asked with the user.
12. an electronic map data memory storage is characterized in that, comprising::
Pretreatment unit, be used in advance with the map source data proportionally the chi size be divided into a plurality of ranks, and set an engineer's scale grade threshold;
The raster data storage unit, the map datum that is used for the engineer's scale grade is not higher than said threshold value is with the raster data format;
The vector data storage unit, the map datum that is used for the engineer's scale grade is higher than said threshold value is with the vector data format.
13. device according to claim 12 is characterized in that, also comprises:
Indexing units is used for the map datum of different brackets engineer's scale is set up index respectively;
Merge cells, being used for the engineer's scale grade is sign, obtains map data file after the index that the map datum of each grade engineer's scale and said indexing units are set up merges.
14. device according to claim 12 is characterized in that, said raster data storage unit concrete configuration is:
Be not higher than the engineer's scale grade of said threshold value for each, respectively the storage raster data corresponding with this grade.
15. device according to claim 12 is characterized in that, said vector data storage unit concrete configuration is:
For the engineer's scale grade that is higher than said threshold value more than two, as sign, use identical vector data to store with different engineer's scale grades.
16. device according to claim 15 is characterized in that, said vector data storage unit further is configured to:
Be used for map datum, respectively the different place identification information of corresponding engineer's scale class stores for different proportion chi grade.
17. device according to claim 12 is characterized in that, said device also comprises:
The raster data drawing unit is used to utilize map source data medium scale grade not to be higher than the vector data of said threshold value, draws out the raster data of corresponding proportion chi grade, and the raster data of being drawn out is used for said raster data storage unit and stores.
18. an electronic map data inquiry unit is characterized in that, comprising:
The query requests receiving element is used to receive user's map datum query requests, carries engineer's scale class information and geographical location information in the said query requests;
Engineer's scale grade judging unit is used for according to said engineer's scale class information, and whether the engineer's scale grade that the interpretation user is asked is higher than preset engineer's scale grade threshold;
The first inquiry response unit; The judged result that is used at said engineer's scale grade judging unit is under the situation that is; According to said engineer's scale class information and geographical location information; Obtain corresponding vector data, and utilize the vector data that is obtained to draw out raster data, drawing result is returned to the user as Query Result;
The second inquiry response unit; The judged result that is used at said engineer's scale grade judging unit is under the situation not; According to said engineer's scale class information and geographical location information, obtain corresponding raster data, the raster data that is obtained is returned to the user as Query Result.
19. device according to claim 18 is characterized in that, said vector data and raster data are sign with the engineer's scale grade, are stored in the map data file.
20. device according to claim 19 is characterized in that, the said first inquiry response unit comprises:
The vector data layer is confirmed subelement, is used for according to said engineer's scale class information, in map data file, confirms the corresponding vector data layer of engineer's scale grade of being asked with the user;
Vector data obtains subelement, is used for the data directory according to the vector data layer, obtains the corresponding vector data of geographical location information of being asked with the user;
The first response subelement is used to utilize said vector data to obtain the vector data that subelement obtains and draws out raster data, and drawing result is returned to the user as Query Result.
21. device according to claim 20 is characterized in that, the said first inquiry response unit also comprises:
Identification information obtains subelement, is used to obtain and the corresponding place of geographical location information identification information, and said place identification information is used for the said first response subelement and carries out the drafting of raster data.
22. device according to claim 19 is characterized in that, the said second inquiry response unit comprises:
The raster data layer is confirmed subelement, is used for according to said engineer's scale class information, in map data file, confirms the corresponding raster data layer of engineer's scale grade of being asked with the user;
Raster data obtains subelement, is used for the data directory according to the raster data layer, obtains the corresponding raster data of geographical location information of being asked with the user;
The first response subelement is used for that said raster data is obtained the raster data that subelement obtains and returns to the user as Query Result.
23. an electronic map system is characterized in that, comprises like each described electronic map data memory storage of claim 12-17 and each described electronic map data inquiry unit of claim 18-22.
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Application publication date: 20120307 |