CN102054388A - Method for receiving and displaying map - Google Patents
Method for receiving and displaying map Download PDFInfo
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Abstract
The invention discloses a method for receiving and displaying a map, which relates to a map display method used in a network electronic map system. The method comprises the following steps: grading geographic data in a whole map, and establishing a mapping relationship between each grade and the corresponding layer as well as a relationship between each layer and the corresponding display scale; dividing the whole map into a plurality of grids, and sequentially numbering; storing geographic data in each grid in a map server according to the grade; and receiving and displaying the map by means of a client terminal, wherein the step of receiving and displaying the map by means of the client terminal comprises the following steps: setting the longitude and latitude of the central position of a screen as well as a display scale; calculating the number and layer of each grid which needs to be displayed on the screen according to the longitude and latitude of the screen center as well as the scale; asking the map server for the layers of the grids which need to be displayed but the terminal does not have, receiving the layers of the grids, and combining with the layers of the existing grids into a display map; displaying the display map on the screen; modifying the longitude and latitude of the screen center in case of translation operation; and modifying the scale in case of zooming operation.
Description
Technical field
The present invention relates to be applied to the map-indication method in the network electronic map system.
Background technology
Most important network electronic map system is the product that the modern network communication technology and map combine in the internet geographic information services.The network electronic map system is a carrier with the Internet, uses the space distribution of the visualization digital cartographic representation geographical entity of different the level of details.The network electronic map system mainly is made up of map server and client terminal.Map server is finished and is comprised and basic, the of overall importance processing operation relevant with electronic chart such as pass under visualization digital map generalization electronically, geography information modification, geographical information query, the geography information.The major function of client terminal is the browse operation that electronic map systems such as map inquiry, map reception, displayed map, translation map and convergent-divergent map are provided for the user.During the client terminal displayed map, needing earlier provides resolution, the pairing longitude in display screen center and the latitude of this terminal display and the engineer's scale that shows by the internet to map server; Map server from one of electronic chart of this engineer's scale intercepting data to visualization digital map that should terminal display, and downloads to client terminal by the internet with the data of this visualization digital map with this, for its demonstration.In case client terminal needs the translation map, promptly change pairing longitude in display screen center and latitude, map server will intercept the data of another piece to visualization digital map that should terminal display on the electronic chart of current engineer's scale, and the data of this visualization digital map are downloaded to client terminal by the internet, for its demonstration.In case client terminal needs the convergent-divergent map, promptly change the engineer's scale of the demonstration of display screen, map server will intercept a visualization digital map to different the level of details that should terminal display on the electronic chart of another engineer's scale, and the data of this visualization digital map are downloaded to client terminal by the internet, for its demonstration.Client terminal is in the process of displayed map, need constantly to ask for data with the visualization digital map of downloading a large amount of different the level of details from map server, thus the bandwidth and the network communications technology of Internet are had higher requirement by the internet.How under network bandwidth condition of limited, reducing map datum data quantity transmitted in network effectively, is the critical problem that the industry is paid close attention to.
Summary of the invention
The present invention aims to provide the method for a kind of reception and displayed map, make map server that the map datum that satisfies the client terminal demand can be provided efficiently, apace, reduce map datum data quantity transmitted in network to greatest extent, show service thereby make client terminal obtain good map.
Technical scheme of the present invention is: the method for a kind of reception and displayed map, to the graduation of the geodata in the view picture map, set up the mapping relations of each grade geodata and corresponding diagram layer, and set up the corresponding relation of each figure layer and corresponding displaying ratio chi; With identical difference of latitude the view picture map is divided into plurality of grids by identical difference of longitude, order is given numbering respectively for each grid; In the map server geodata in each grid is stored by grade;
Client terminal receives and the process of displayed map comprises following steps:
Steps A is provided with the longitude and the latitude of current screen center, the engineer's scale of screen display is set, execution in step B;
Step B calculates the numbering of each grid that should show and schemes layer, execution in step C by the longitude at current screen center and the engineer's scale of latitude and screen display on screen;
Step C, this terminal is if lack the figure layer of answering show grid, then asks for the figure layer of this grid and receives the figure layer of this grid to map server, then with the new displayed map of figure layer composition of figure layer with the existing grid of this grid; Execution in step D;
Step D shows current displayed map, execution in step E on screen;
Step e, this terminal is then revised the longitude and the latitude at current screen center if translation is arranged, and changes step B, otherwise execution in step D;
Step F, this terminal are then revised the engineer's scale that current screen shows if zoom operations is arranged, and change step B, otherwise execution in step D.
In the present invention, the storage of map data file is based on grid dividing, and the geodata of grid inside is stored by different brackets.The geodata combination of different brackets is mapped as the different figure layer corresponding with the displaying ratio chi again.Grid data under so different displaying ratio chi situation can be regarded as by some different figure layers and form, and client terminal just can be asked for map datum for unit to map server by the figure layer.Grid numbering and figure layer identification code that map server only needs to provide by client terminal are found out the figure layer of corresponding grid, and do not need temporarily to the map making cutting process; So map server can provide the map datum that satisfies the client terminal demand efficiently, apace.Client terminal is the geodata that unit shows each grid according to the difference of displaying ratio chi to scheme layer.When client terminal carries out map translation, zoom operations, when needing new map datum, grid numbering and figure layer that client terminal need show by calculating screen, can make full use of the correlativity between each figure layer in the same grid, only require map server to scheme the map datum that layer is the newly-increased grid of unit transmission, figure layer.Rather than require to download whole video datas from map server, reduced the transmission quantity of map server effectively significantly to map datum.
Because the restriction of Network Transmission bandwidth, when occurring client terminal sometimes and carrying out new map operation, the map datum that a preceding map operation is asked also is not transferred to the situation of client terminal fully, and in the embodiment that optimizes: described step C comprises following substep:
Substep C1 checks the figure layer of the existing grid of this terminal, if lack the figure layer of answering show grid, then carries out substep C2, otherwise execution in step D;
Substep C2 asks for the figure layer of the grid that should show that this terminal lacks to map server; Carry out substep C3;
Substep C3, the figure layer of a grid that should show that this terminal lacked of reception is carried out substep C4;
Substep C4 checks whether this terminal has translation, is then to carry out substep C5; Otherwise carry out substep C6;
Substep C5, notice map server stop to send the figure layer of the grid that should show that this new terminal lacks; Revise the longitude and the latitude at current screen center, change step B;
Substep C6 checks whether this terminal has zoom operations, is then to carry out substep C7; Otherwise carry out substep C8;
Substep C7, notice map server stop to send the figure layer of the grid that should show that this new terminal lacks; Revise the engineer's scale that current screen shows, change step B;
Substep C8, whether inspection has received the figure layer of the grid that should show that whole these terminals are lacked, is then to carry out substep C9; Otherwise carry out substep C3;
Substep C9, the figure layer of the grid that should show that paid-in all these terminals are lacked and the figure layer of existing grid are combined into new displayed map; Execution in step D.
Client terminal has been introduced request and has been cancelled the mechanism that sends new map datum.Client terminal judges whether that regularly new translation or zoom operations lost efficacy the map datum of also no show in the process that receives new map datum.If new translation or zoom operations are arranged, then situation is in time notified the map server cancellation to send those and is not finished transmission but failed map datum.Reduce map server and sent invalid data.This measure has further reduced the map datum transmission quantity of map server effectively.
The method of reception of the present invention and displayed map based on grid dividing, is stored by different brackets the geodata in the grid.The geodata combination of different brackets is mapped as the different figure layer corresponding with the displaying ratio chi again.Client terminal has been given full play to the computing power of each client terminal from host computer screen display required grid and figure layer, and the corresponding data processing amount that reduces map server makes map server provide service for more client terminal.Client terminal asks for and uses the map datum of gridding to map server for unit by the figure layer.When client terminal carries out map translation, zoom operations, when needing new map datum: can make full use of existing grid of this terminal and figure layer, only require the map datum of newly-increased grid of map server transmission or figure layer.Map server can directly extract the figure layer of required grid by the requirement of client terminal, and does not need temporarily to the map making cutting process.So the treatment effeciency height of map server, the data volume of Network Transmission is little, the Network Transmission number of times is few.Under the condition that does not increase the network bandwidth, improved the transfer efficiency of map datum.
Description of drawings
Fig. 1 is among embodiment of method of reception of the present invention and displayed map being divided into the view picture map numbering synoptic diagram of grid and each grid.
Fig. 2 is the graduate table of comparisons of various geodatas among Fig. 1 embodiment.
Fig. 3 is the mapping relations table of each grade geodata and corresponding diagram layer among Fig. 1 embodiment.
Fig. 4 is the mapping table of each figure layer and corresponding displaying ratio chi among Fig. 1 embodiment.
Fig. 5 is the main flow chart of Fig. 1 embodiment.
Fig. 6 is the sub-process figure of step B in Fig. 5 main flow chart.
Fig. 7 is the synoptic diagram of translation among Fig. 1 embodiment.
Fig. 8 is the synoptic diagram of amplifieroperation among Fig. 1 embodiment.
Fig. 9 is among second embodiment of method of reception of the present invention and displayed map being divided into the view picture map numbering synoptic diagram of grid and each grid.
Figure 10 is the main flow chart of Fig. 9 embodiment.
Figure 11 is the synoptic diagram of twice translation among Fig. 9 embodiment.
Embodiment
One, embodiment one
An embodiment of the method for reception of the present invention and displayed map, at first view picture whole nation map along longitude by identical difference of longitude, divide by identical difference of latitude along the latitude direction, view picture whole nation map is divided into the square node that several are arranged by row, column, and order is given numbering (ID) respectively for each grid.The grid numbering is since 1; Risen by a most left row grid, every row grid is pressed order from top to bottom, makes the numbering of each grid add one in proper order from small to large successively, and a row grid that forwards the right side then to continues numbering.Suppose view picture whole nation map is divided into capable grid of (M+1) row and N, then the numbering of each grid has with equation expression as shown in Figure 1:
Grid numbering=(row of this grid column number-1) * (total grid line number N)+(row of this grid place row number).
To the geodata graduation in the map of the view picture whole nation, suppose that hierarchical table as shown in Figure 2 is divided into L grade.Graduate map datum is combined into the different geodatas of scheming layer, has set up the mapping relations of each grade geodata and corresponding diagram layer, mapping table promptly shown in Figure 3.
And then the map datum under the different displaying ratio chis regarded as geodata by difference figure layer combines, set up the corresponding relation of each figure layer and corresponding displaying ratio chi.Suppose to have K kind displaying ratio chi, then the figure layer data that comprises of each displaying ratio chi is organized as shown in Figure 4.
As can be seen from Figure 4, to same net region, under the different proportion chi, the scrutable geography information the level of detail of user is different.
Under high-grade displaying ratio chi condition, the user can recognize geography information more detailed in this net region, and need be more in the figure number of plies that client terminal shows; Under inferior grade displaying ratio chi condition, to lack under the situation of the scrutable geography information higher level of user displaying ratio chi, the figure number of plies that needs client terminal to show is few.Promptly client terminal needs the data presented amount than needing the data presented amount abundanter under inferior grade displaying ratio chi under high-grade displaying ratio chi, requires to comprise the more data of multi-layer image under the high-grade displaying ratio chi situation.
There is certain correlativity in the same grid between the map datum of different proportion chi: the map datum that has comprised lower grade in the higher map datum of displaying ratio chi grade.When the displaying ratio chi grade of client terminal improved, client terminal can utilize the figure layer of existing different proportion chi in the same grid, and only extracted the figure layer of that part of needs demonstration that self lacks to map server.When the displaying ratio chi grade of client terminal reduced, client terminal only needed unnecessary the layers section in the figure layer of existing different proportion chi in the same grid is abandoned.Thereby having reduced map server provides the quantity of the map datum that meets new displaying ratio chi and the transmission quantity of these map datums to client terminal.
In map server, the geodata in each grid is stored by grade.
When client terminal needs the geodata of a certain displaying ratio chi in certain grid, mapping relations according to above-mentioned each grade geodata and corresponding diagram layer, and the corresponding relation of above-mentioned each figure layer and corresponding displaying ratio chi, client terminal can call the geodata that belongs to this displaying ratio chi in this grid by figure course map server respectively.
The process of client terminal reception and displayed map, as shown in Figure 5:
Automatically perform steps A after the start.
Steps A, client terminal are accepted the longitude and the latitude of the current screen center of operator's setting, and client terminal is accepted the engineer's scale of the screen display of operator's setting, execution in step B.
Step B, client terminal calculates the numbering of each grid that should show and schemes layer, execution in step C by the longitude at current screen center and the engineer's scale of latitude and screen display on screen.
Step C, client terminal is checked the figure layer of each grid that this terminal is existing, this terminal is if lack the figure layer of answering show grid, then ask for these to map server and should and receive the figure layer of these grids that should show on screen at the figure of show grid on screen layer, the new grid chart layer that will receive of client terminal is formed new displayed map with the figure layer of existing each grid that should show on screen then; Execution in step D.
Step D, client terminal show current displayed map, execution in step E on screen.
Step e, client terminal are checked the translation input port of this terminal, and this terminal is then revised the longitude and the latitude at current screen center if translation is arranged according to this translation, change step B, otherwise execution in step D.
Step F, client terminal are checked the convergent-divergent input port of this terminal, and this terminal is then revised the engineer's scale that current screen shows according to this zoom operations if zoom operations is arranged, and changes step B, otherwise execution in step D.
Among the above-mentioned step B, client terminal calculate each grid that should on screen, show numbering sub-process as shown in Figure 6.
For ease of explanation, we use following parameter:
LonMin_China: minimum longitude in the body of a map or chart of the view picture whole nation is a definite value.
LonMax_China: maximum longitude in the body of a map or chart of the view picture whole nation is a definite value.
LatMin_China: minimum latitude value in the body of a map or chart of the view picture whole nation is a definite value.
LatMax_China: maximum latitude value in the body of a map or chart of the view picture whole nation is a definite value.
ColumuNum: the grid number that view picture whole nation map is divided on longitudinal, promptly total grid columns (M+1).
RowNum: the grid number that view picture whole nation map is divided on the latitude direction, promptly total grid line number N.
PerDegree_Row: on the longitudinal, the difference of longitude of each grid.
PerDegree_Row＝(LonMax_China-LonMin_China)/ColumuNum
PerDegree_Column: on the latitude direction, the difference of latitude of each grid.
PerDegree_Column＝(LatMax_China-LatMin_China)/RowNum
ScrWidth: the pixel count of screen width direction is a definite value.
ScrHeight; The pixel count of screen height direction is a definite value.
PixelPerDegree_Base: the reference image prime number, during the map of the screen display view picture whole nation, the pixel count of 1 degree longitude and latitude correspondence.
PixelPerDegree_Base＝ScrWidth/(LonMax_China-LonMin_China)
ZoomScale: to the amplification coefficient of reference image prime number, provide under the current displaying ratio chi by the corresponding table of comparisons.
Step B0, beginning automatically performs step B1.
Step B1, the engineer's scale that client terminal shows by current screen extracts under the current displaying ratio chi amplification coefficient ZoomScale to the reference image prime number from the corresponding table of comparisons, and then calculate the screen display pixel count PixelPerDegree of current every degree longitude and latitude correspondence, execution in step B2.
Wherein:
PixelPerDegree＝PixelPerDegree_Base*ZoomScale。
Step B2, client terminal calculates the minimum longitude LonL_View that shows on the current screen, maximum longitude LonR_View, minimum latitude LatB_View, maximum latitude LatT_View, execution in step B3 by the longitude LonC at current screen center, the latitude LatC at current screen center and the screen display pixel count PixelPerDegree of current every degree longitude and latitude correspondence.
Wherein:
LonL_View＝LonC-(ScrWidth/2)/PixelPerDegree；
LonR_View＝LonC+(ScrWidth/2)/PixelPerDegree；
LatB_View＝LatC-(ScrHeight/2)/PixelPerDegree；
LatT_View＝LatC+(ScrHeight/2)/PixelPerDegree。
Step B3, client terminal by the minimum longitude LonL_View that shows on the current screen, maximum longitude LonR_View, minimum latitude LatB_View, maximum latitude LatT_View calculate the row LeftColumn of the most left grid that shows on the current screen, the rightest grid row RightColumn, go up the row TopRow of grid most and descend the row BottomRow of grid most, execution in step B.
Wherein:
LeftColumn＝(LonL_View-LonMin_China)/PerDegree_Row；
RightColumn＝(LonR_View-LonMin_China)/PerDegree_Row；
TopRow＝(LatMax_China-LatT_View)/PerDegree_Column；
BottomRow＝(LatMax_China-LatB_View)/PerDegree_Column。
Step B4, client terminal the row LeftColumn of left grid deposit current mesh column unit in, deposit the row TopRow that goes up grid most in current mesh row unit, execution in step B5.
Step B5, client terminal is by the numbering of the current grid of numerical evaluation of the numerical value of current mesh column unit and current mesh row unit and be kept in the current show grid table execution in step B6.
Wherein:
The numbering of current grid=(numerical value-1 of current mesh column unit) * (total grid line number N)+(numerical value of current mesh row unit).
Step B6, client terminal judge whether the numerical value of current mesh row unit equals to descend most the row BottomRow of grid, are execution in step B8 then; Otherwise execution in step B7.
Step B7, client terminal adds one with the numerical value of current mesh row unit.Execution in step B5.
Step B8, client terminal judge whether the numerical value of current mesh column unit equals the row RightColumn of right grid, are execution in step B10 then; Otherwise execution in step B9.
Step B9, client terminal adds one with the numerical value of current mesh column unit.Execution in step B.
Step B10 finishes.
Client terminal mainly contains two kinds of Pan and Zoom operations when carrying out map operation.
The displaying ratio chi of screen is constant during translation, and each grid that shows on screen may change.Please referring to Fig. 7, client terminal is before doing translation, and screen display state is S1, shows ID1 on the screen, ID2, and ID3, ID4, ID5, ID6, ID7, ID8, the geodata of these 9 grids of ID9, the displaying ratio chi is N1.After carrying out translation, the displaying ratio chi still is N1, and screen display state is S2; The grid that needs on the screen to show has become ID7, ID8, ID9, ID10, ID11, ID12, ID13, ID14, these 9 grids of ID15.
The grid coding that grid coding that this moment, client terminal can need show by current screen relatively and previous state screen have shown judges whether the grid that exists new needs to show.Client terminal needs to download ID10, ID11, ID12, ID13, ID14, the map datum of these 6 grids of ID15 by relatively obtaining.Client terminal is keeping ID7, in the time of ID8, the map datum of these 3 grids of ID9, sends request to map server, asks for the map datum of the grid that above-mentioned 6 new needs show.
Client terminal is received the ID10 that map server issues, ID11, and ID12, ID13, ID14, behind the map datum of these 6 grids of ID15, with the ID7 that self keeps, ID8, the map datum of these 3 grids of ID9 carries out assembly unit, finally is presented on the screen of client terminal.
Here need to prove, when translation, S1 and all identical situation of grid shown in the S2 state may occur, just do not need to send request in this case, ask for the map datum of new grid to map server.
During amplifieroperation, variation has all taken place in the grid, the displaying ratio chi that need on the screen to show.Please referring to Fig. 8.Suppose client terminal before doing amplifieroperation, the displaying ratio chi is N1, and screen display state is S3, shows ID31 on the screen, ID32, ID33, ID34, ID35, ID36, ID37, ID38, the map datum of these 9 grids of ID39, the corresponding figure layer that uses is figure layer 1, figure layer 2, figure layer 3, figure layer 4.After carrying out amplifieroperation, the displaying ratio chi becomes N2, and screen display state becomes S4, and the grid that needs on the screen to show has become ID34, ID35, and ID37, these 4 grids of ID38, the corresponding figure layer that uses is figure layer 1, figure layer 2, figure layer 3, figure layer 4, figure layer 5, figure layer 6.
Client terminal is by relatively calculating, and the map datum that obtains needing increment to load is grid ID34, ID35, ID77, the figure layer 5 in these 4 grids of ID88, figure layer 6.Client terminal deletion does not need the grid ID31 that shows, ID32, the map datum of ID33, keeping grid ID34, ID35, ID37, figure layer 1 among the ID38, figure layer 2 is in the time of figure layer 3, figure layer 4, send download ID34 to the map server end, ID35, ID37, the request of figure layer 5, figure layer 6 in these 4 grids of ID38.
Client terminal is received the ID34 that map server issues, ID35, ID37, behind figure layer 5 in the ID38 grid, the figure layer 6, with the ID34 that self keeps, ID35, ID37, the figure layer 1 among the ID38, figure layer 2, figure layer 3, figure layer 4 carry out assembly unit, finally are presented on the client terminal screen.
For reduction operation, can analogize; So repeat no more.
Two, embodiment two
Second embodiment of the method for reception of the present invention and displayed map, client terminal have introduced request and have cancelled the mechanism that sends new map datum.
In the present embodiment, at first view picture whole nation map along longitude by identical difference of longitude, divide by identical difference of latitude along the latitude direction, view picture whole nation map is divided into the square node that several are arranged by row, column, and order is given numbering (ID) respectively for each grid.
The grid numbering is since 1; Risen by delegation's grid of going up most, every capable grid is pressed order from left to right, makes the numbering of each grid add one in proper order from small to large successively, forwards following delegation's grid then to and continues numbering.Suppose view picture whole nation map is divided into the S row and (R+1) goes a grid, then the numbering of each grid has with equation expression as shown in Figure 9:
Grid numbering=(row of this grid place row number-1) * (total grid columns S)+(row of this grid column number).
Present embodiment is as last embodiment, and the geodata graduation in the map of the view picture whole nation is combined into the different geodatas of scheming layer with graduate map datum, has set up the mapping relations of each grade geodata and corresponding diagram layer.Set up the corresponding relation of each figure layer and corresponding displaying ratio chi.In map server, the geodata in each grid is stored by grade.
When client terminal needs the geodata of a certain displaying ratio chi in certain grid, mapping relations according to above-mentioned each grade geodata and corresponding diagram layer, and the corresponding relation of above-mentioned each figure layer and corresponding displaying ratio chi, client terminal can call the geodata that belongs to this displaying ratio chi in this grid by figure course map server respectively.Client terminal shows the map datum of different figure layers (different stage) under different displaying ratio chis.
The process of client terminal reception and displayed map in the present embodiment, as shown in figure 10:
Automatically perform steps A after the start.
Steps A, client terminal are accepted the longitude and the latitude of the current screen center of operator's setting, and client terminal is accepted the engineer's scale of the screen display of operator's setting, execution in step B ';
Step B ', client terminal calculates the numbering of each grid that should show and schemes layer by the longitude at current screen center and the engineer's scale of latitude and screen display on screen, carry out substep C1;
Substep C1, client terminal check the figure layer of the existing grid of this terminal, if lack the figure layer of answering show grid, then carry out substep C2, otherwise execution in step D;
Substep C2, client terminal ask for the figure layer of the grid that should show that this terminal lacks to map server; Carry out substep C3;
Substep C3, client terminal receives the figure layer of a grid that should show that this terminal lacked, and carries out substep C4;
Substep C4, client terminal check whether this terminal has translation, is then to carry out substep C5; Otherwise carry out substep C6;
Substep C5, client terminal notice map server stop to send the figure layer of the grid that should show that this new terminal lacks; Revise the longitude and the latitude at current screen center, change step B ';
Substep C6, client terminal check whether this terminal has zoom operations, is then to carry out substep C7; Otherwise carry out substep C8;
Substep C7, client terminal notice map server stop to send the figure layer of the grid that should show that this new terminal lacks; Revise the engineer's scale that current screen shows, change step B ';
Substep C8, whether the client terminal inspection has received the figure layer of the grid that should show that whole these terminals are lacked, is then to carry out substep C9; Otherwise carry out substep C3;
The figure layer of the grid that should show that substep C9, client terminal are lacked paid-in all these terminals and the new displayed map of figure layer composition of existing grid; Execution in step D.
Step D, client terminal show current displayed map, execution in step E on screen;
Step e, client terminal are checked the translation input port of this terminal, and this terminal is then revised the longitude and the latitude at current screen center if translation is arranged according to this translation, change step B ', otherwise execution in step D;
Step F, client terminal are checked the convergent-divergent input port of this terminal, and this terminal is then revised the engineer's scale that current screen shows according to this zoom operations if zoom operations is arranged, and changes step B ', otherwise execution in step D.
Among the step B ' described in the present embodiment, client terminal calculates each grid that should show on screen the process of numbering is identical with the step B of last embodiment, and the formula that just calculates concrete grid numbering should adopt present embodiment that foregoing formula is described.
Client terminal is when carrying out two kinds of map operations of Pan and Zoom operation, and a kind of situation is to make translation, and the displaying ratio chi is constant; The grid that shows on screen may change.Another kind of situation is to make zoom operations, and variation has all taken place for the grid that screen need show, displaying ratio chi.To both of these case, the concrete processing of client terminal repeats no more here as last embodiment.
Because the restriction of Network Transmission bandwidth, when occurring client terminal sometimes and carrying out new map operation, the map datum that a preceding map operation is asked also is not transferred to the situation of client terminal fully, can in time send the cancellation fail data to map server at above-mentioned substep C3 to substep C8 client terminal and send request, the immediate cancel of notice map server sends the fail data that does not also send.
For example, client terminal is the situation of twice translation successively, please referring to Figure 11.
Before client terminal was done the translation first time, screen display state was S5, and the displaying ratio chi is N1, shows ID51 on the screen, ID52, ID53, ID54, ID55, ID56, ID57, ID58, the geodata of these 9 grids of ID59.
After client terminal carried out the translation first time, screen display state was S6, and the displaying ratio chi is N1 still, and the grid that needs on the screen to show has become ID57, ID58, ID59, ID60, ID61, ID62, ID63, ID64, these 9 grids of ID65.Client terminal is by calculating, and the new map datum that obtains needing to download is grid ID60, ID61, ID62, ID63, ID64, ID65.Client terminal is keeping ID57, and ID58 in the time of the ID59 data, sends download grid ID60 to server end, ID61, ID62, ID63, ID64, the request of ID65 corresponding figures layer.
If client terminal shows the grid ID60 of the required download of previous state S6, ID61, ID62, when ID63, ID64, ID65 also do not arrive fully, client terminal is judged the user new translation, the geodata of the grid that client terminal notice map server cancellation is not earlier sent; Client terminal makes by calculating that show state is very fast according to new translation and transfers S7 to by S6 then, and the new map datum that obtains needing to download is grid ID66, ID67, ID68, ID69, ID70, ID71, ID72, ID73, ID74.Client terminal sends the required grid ID66 of show state S7, ID67, ID68, ID69, ID70, ID71, ID72, ID73, the request of ID74 corresponding figures layer of downloading to the map server end.
If map server does not also send the required new grid ID60 of show state S6, ID61, ID62, ID63, ID64, ID65 corresponding figures layer, then map server is cancelled the transmission of this part data, only sends the required grid ID66 of show state S7, ID67, ID68, ID69, ID70, ID71, ID72, ID73, the corresponding figures layer of ID74 is to client terminal.
Client terminal is received the new grid ID66 that map server issues, ID67, and ID68, ID69, ID70, ID71, ID72, ID73 behind the corresponding figures layer of ID74, is presented on the client terminal screen.
For zoom operations, can analogize; So repeat no more.
The above only is two preferred embodiments of the inventive method, does not limit scope of the invention process with this, and the equivalence of doing according to technical scheme of the present invention and description changes and modification, all should belong to the scope that the present invention is contained.
Claims (2)
1. the method for reception and displayed map to the graduation of the geodata in the view picture map, is set up the mapping relations of each grade geodata and corresponding diagram layer, sets up the corresponding relation of each figure layer and corresponding displaying ratio chi; With identical difference of latitude the view picture map is divided into plurality of grids by identical difference of longitude, order is given numbering respectively for each grid; In the map server geodata in each grid is stored by grade;
Client terminal receives and the process of displayed map comprises following steps:
Steps A is provided with the longitude and the latitude of current screen center, the engineer's scale of screen display is set, execution in step B;
Step B calculates the numbering of each grid that should show and schemes layer, execution in step C by the longitude at current screen center and the engineer's scale of latitude and screen display on screen;
Step C, this terminal is if lack the figure layer of answering show grid, then asks for the figure layer of this grid and receives the figure layer of this grid to map server, then with the new displayed map of figure layer composition of figure layer with the existing grid of this grid; Execution in step D;
Step D shows current displayed map, execution in step E on screen;
Step e, this terminal is then revised the longitude and the latitude at current screen center if translation is arranged, and changes step B, otherwise execution in step D;
Step F, this terminal are then revised the engineer's scale that current screen shows if zoom operations is arranged, and change step B, otherwise execution in step D.
2. the method for a kind of reception according to claim 1 and displayed map, it is characterized in that: described step C comprises following substep:
Substep C1 checks the figure layer of the existing grid of this terminal, if lack the figure layer of answering show grid, then carries out substep C2, otherwise execution in step D;
Substep C2 asks for the figure layer of the grid that should show that this terminal lacks to map server; Carry out substep C3;
Substep C3, the figure layer of a grid that should show that this terminal lacked of reception is carried out substep C4;
Substep C4 checks whether this terminal has translation, is then to carry out substep C5; Otherwise carry out substep C6;
Substep C5, notice map server stop to send the figure layer of the grid that should show that this new terminal lacks; Revise the longitude and the latitude at current screen center, change step B;
Substep C6 checks whether this terminal has zoom operations, is then to carry out substep C7; Otherwise carry out substep C8;
Substep C7, notice map server stop to send the figure layer of the grid that should show that this new terminal lacks; Revise the engineer's scale that current screen shows, change step B;
Substep C8, whether inspection has received the figure layer of the grid that should show that whole these terminals are lacked, is then to carry out substep C9; Otherwise carry out substep C3;
Substep C9, the figure layer of the grid that should show that paid-in all these terminals are lacked and the figure layer of existing grid are combined into new displayed map; Execution in step D.
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