CN102254312A - Method for splicing geographical tile graphs - Google Patents
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Abstract
The invention discloses a method for splicing geographical tile graphs. The method is characterized by comprising the following steps of: 1) setting an initial environment, which comprises an algorithm interface inlet and outlet parameter specification applicable to an energy management system (EMS), and a coding mode and initial parameters of a tile graph resource file name; 2) directly determining the ranges of the line number and row number of tiles in corresponding levels according to the range and level of required pictures; 3) finding relationships between the line number and row number of the tiles in the corresponding levels and the names of tile files; and 4) splicing the contents of the tile files acquired in the step 3) into a whole picture, intersecting with the range of the required pictures in the step 2), and acquiring a final output picture. The method for splicing the geographical tile graphs has the advantages that: the time complexity and space complexity of an algorithm can be kept to be O(1); and the algorithm serves in the EMS in a good interface mode and can directly supply a universal interface for calling of all application in a system.
Description
Technical field
The present invention relates to the tile splicing methods of exhibiting of a kind of geographical background figure in the electric power dispatching system, belong to computer graphics visualization technique field.
Background technology
In the graphics software if show large-scale geographical map, and can amplify the map that shows under the scale down under the different proportion in difference, each grade scaling picture display precision is constant, the mosaic that picture stretching back occurs promptly can not appear, promptly need to use tile geographic map technology, vary in size on the basis of geographic tile figure of level having a large amount of same sizes, the tile stitching algorithm of use realizes dynamically exporting the clear picture under the required scope on any required level.
Current a lot of algorithm all can not make the time complexity of algorithm and space complexity all remain on 0 (1), and not can be good at serving in the energy management system (EMS) in the electric system with interface mode.
Summary of the invention
Goal of the invention of the present invention is:
First technical matters to be solved by this invention is how effectively to realize stitching algorithm, and can make the time complexity of algorithm and space complexity can both remain on 0 (1) complexity, promptly after given output map scope, the complexity substantially constant is not with convergent-divergent level N relation in direct ratio.
Another technical matters to be solved by this invention is to serve in the electric power energy management system (EMS) as excellent interface mode how, can directly provide general-purpose interface to each application call under the system.
To achieve the above object of the invention, the present invention adopts following technical scheme to realize:
A kind of geographic tile figure joining method is characterized in that, may further comprise the steps:
1) sets initial environment, comprise the algorithm interface discrepancy parameter standard that is applicable to the EMS system, coded system, the initial parameter of tile image resource file name;
2) directly determine row of tiles number row scope under the corresponding level by required picture scope and level;
3) find relation between tile ranks under the corresponding level number and the tile file name, promptly return the title of corresponding tile file by tile ranks number and level, by with last time search for tile buffer memory comparison, in the buffer memory not this figure obtain image content to internal memory from disk again;
4) by the tile file content that obtains in the step 3) be spliced into picture in its entirety and with step 2) in required picture scope intersect and obtain final output picture;
At the platform requirement of electric power energy management system (EMS), this algorithm is to be based upon on the basis of satisfying following geographic tile graph code rule to propose:
Set the coded system of tile image resource file name, the constant magnitude of each width of cloth tile figure is on the size of 256 * 256 pixel sizes, and file designation is according to following rule, and synoptic diagram is seen accompanying drawing 1;
A) global map spreads apart, and ground floor is divided into 4 tile figure, and every amplification one deck is divided into four tile figure again with the tile figure of one deck before corresponding, by that analogy, according to different scalings global ratio is divided into 2
N* 2
NThe picture of (N is the absolute level in the whole world);
B) naming method of tile map file title is that combination of numbers forms among a series of 0,1,2,3, the tile coding is according to tile-2 bottom right, upper left tile-0 upper right tile-1 lower-left tile-3 rule, if the previous stage tile of current tile be encoded to XXX, so according to placement of tiles under this tile determine this tile coding (upper left for XXX0, upper right for XXX1, lower-left be that XXX2, bottom right are XXX3);
C), then can just can know that tile is to the full detail at GPS according to the length of filename coding according to this coding;
Aforesaid geographic tile figure joining method, it is characterized in that: in described step 1), the come in and go out scope of parameter standard of described algorithm interface is the required maximum magnitude of seeing under the current geographical environment in the EMS system, it is geographical background figure scope in the EMS system, retrain with four tiles number and a rectangular extent, on behalf of the superiors, four tiles number to comprise four tile figure under the required maximum geographic range; Rectangular extent is described in the initial range under these four tile figure, decides with upper left point coordinate, lower-right most point coordinate, and upper left point coordinate and the two point coordinate scope normalization of lower-right most point coordinate are between (0-1).
As initial environment, make following standard for algorithm interface, be input as:
1, the current level of N;
2, OUT_SIZE (the output map chip size of width * height);
3, (REQUEST_X, REQUEST_Y) output picture central point; Setting up one is cartesian coordinate system under the initial point with the upper left point of initial range, should output picture central point be so in the coordinate under this coordinate system (coordinate normalization is in the 0-1 scope), for example coordinate (0.5,0.5) is the coordinate of positive central point in the initial rectangular scope;
The setting of this input parameter has taken into full account the singularity of EMS System Application Architecture, greatly facilitates other application calling for this interface in the EMS system with normalized scope coordinate as input parameter; Be output as the full picture under the current level that satisfies the output map chip size.
Aforesaid geographic tile figure joining method, it is characterized in that: in described step 2) in, directly determine row of tiles number row scope under the corresponding level by required picture scope and level, as shown in Figure 3, by input 3 in the step 1) and input 2 and initial rectangular scope, can calculate required picture scope rectangle, again according to input 1 and required picture scope rectangle in the step 1), 4 initial environment rectangles can be obtained row of tiles columns scope under the corresponding demand level fast with the operation of required picture scope rectangle intersection respectively, it is as follows that ranks are counted computing formula:
Initial row Row1=f (X
1* 2
N-1), X wherein
1Be required picture scope normalization rectangle upper left corner X-axis coordinate, N is current level, and f () function is for rounding operation;
Initial column Col1=f (Y
1* 2
N-1), Y wherein
1Be required picture scope normalization rectangle upper left corner Y-axis coordinate, N is current level, and f () function is for rounding operation;
End line Row2=f (X
2* 2
N-1), X wherein
2Be required picture scope normalization rectangle lower right corner X-axis coordinate, N is current level, and if f () function is for rounding operation, in addition X
2=1, f () function subtracts 1 again for rounding operation;
End column Col2=f (Y
2* 2
N-1), Y wherein
2Be required picture scope normalization rectangle lower right corner Y-axis coordinate, N is current level, and if f () function is for rounding operation, in addition Y
2=1, f () function subtracts 1 again for rounding operation.
Aforesaid geographic tile figure joining method, it is characterized in that: each map tile file name that will obtain step 3) and 4) and with file content IO behind memory headroom, previous all map tile content cachings are got off, the request next time that offers is used, come then in interface requests next time, again the picture that needs in the preceding buffer memory is taken out directly and use, for a certain tile title, judge whether it exists in a preceding tile memory cache, if exist, then directly from last time obtaining data the tile internal memory, if still do not exist, again from the disk I image content; Delete the tile that the request of this time in the buffer memory not have needs then, add new tile simultaneously to buffer memory, keeping last time, the tile cache contents is up-to-date.
In general particularly in the operation of map translation, will have with respect to preceding once request that a large amount of identical tile figure is searched to come out to be splicedly, will greatly reduce disk I so like this, internal memory is created deletion work, has improved performance greatly;
Beneficial effect of the present invention: method effect stability of the present invention is effective, the complexity that on the algorithm time complexity, presents O (1) basically with space complexity, substantially not with convergent-divergent level N relation in direct ratio, the reason that reaches this point is that no matter how many level LEVEL is in the step (2), can directly obtain row of tiles number row scope under the corresponding level, and the tile number is irrelevant with level, only relevant with the required picture scope of input parameter basically in this scope; The tile caching mechanism has also reduced repetition IO greatly, has improved performance; Normalized parameter is used in the setting of algorithm interface parameter, has avoided numerous and diverse geographic coordinate and the mutual conversion between the extension view coordinate.
Description of drawings
Fig. 1 tile map file name encoding exemplary plot;
Certain operation of Fig. 2 algorithm is according to request output map environment synoptic diagram;
Fig. 3 directly obtains row of tiles number row scope synoptic diagram under the corresponding level by required picture scope rectangle;
Fig. 4 finds the solution the algorithm flow chart that directly obtains row of tiles number row scope under the corresponding level;
The entire flow figure of Fig. 5 algorithm computer program on microcomputer;
Among the figure: initial 4 tiles of 1-number; 2-obtains intersecting the tile ranks; The 3-initial range; 4-interface requests size; 5-interface requests central point.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed introduction.
A kind of tile stitching algorithm of geographic map in electric power dispatching system that the present invention relates to is that independent development software is realized, uses the C++ programming language, and embeds in existing EMS system graphics architectures;
Below by a concrete application request in detail the whole algorithm workflow is described in detail;
Can see that from accompanying drawing 2 initial environment that we set current algorithm is as follows, 1, the initial range tile number is 13020,13021,13022,13023; 2, the initial rectangular scope is (0.2,0.24), (0.9,0.8);
Suppose the current following algorithm request that has, input parameter is 1, central point coordinate (0.55,0.5); 2, the demand level is 4; 3, demand output map chip size (1800 * 1300);
Method flow diagram of the present invention moves as shown in Figure 5 according to the following steps:
1) at first with parameter and preceding input parameter comparison,, then directly gets in the preceding output map sheet buffer memory and take out the result if parameter is in full accord; In this example, we suppose that parameter is inconsistent, then need to recomputate;
2), directly determine row of tiles number row scope under the corresponding level by required picture scope and demand level as accompanying drawing 3; At first, calculate normalized required picture scope rectangle, successively four initial range rectangles and required picture scope rectangle intersection are calculated then, calculate the crossing rectangle of two rectangles, tile figure ranks that under current level, comprised by this crossing rectangular extent number; In this embodiment, can obtain the following tile ranks scope of corresponding 4 initial range tiles (13020 correspondences (row number from 5-7, row number from 5-7), 13021 correspondences (row number from 5-7, row number from 0-4), 13022 correspondences (row number from 0-2, row number from 5-7), 13023 correspondences (row number from 0-2, be listed as number from 0-4)); Program circuit as shown in Figure 4;
3) number can directly obtain the pairing coding of this tile figure by the ranks that obtain, 13020 times the 4th layer of row 5 for example, the tile of row 5 is pairing to be encoded to 13020303;
4) number obtain corresponding tile map file title by corresponding ranks and it is kept in the formation;
5) begin to travel through whole title formation, for a certain tile title, judge whether it exists in a preceding tile memory cache, if exist, then directly obtaining data from tile internal memory last time gets final product, if still do not exist, load this image content in internal memory by tile map file title so;
6) traversal is finished, and the tile internal memory that will not use in tile buffer memory last time this moment is specifically removed, and remaining last time, the tile cache contents is up-to-date;
7) all the tile figure contents in required picture scope this moment all have been loaded into internal memory, can splice a whole figure (generally being slightly larger than final output picture) under the required tile figure scope, then with this figure and the operation of required picture scope rectangle intersection, the figure that can obtain occuring simultaneously is final required graphical content
8) this figure of buffer memory is if directly use this figure so that input next time input parameter is in full accord; Export this graphic result at last;
The foregoing description does not limit the present invention in any form, and all employings are equal to the technical scheme that mode obtained of replacement or equivalent transformation, all drop in protection scope of the present invention.
Claims (5)
1. a geographic tile figure joining method is characterized in that, may further comprise the steps:
1) sets initial environment, comprise the algorithm interface discrepancy parameter standard that is applicable to the EMS system, coded system, the initial parameter of tile image resource file name;
2) directly determine row of tiles number row scope under the corresponding level by required picture scope and level;
3) find relation between tile ranks under the corresponding level number and the tile file name, promptly return the title of corresponding tile file by tile ranks number and level, by with last time search for tile buffer memory comparison, in the buffer memory not this figure obtain image content to internal memory from disk again;
4) by the tile file content that obtains in the step 3) be spliced into picture in its entirety and with step 2) in required picture scope intersect and obtain final output picture.
2. geographic tile figure joining method according to claim 1, it is characterized in that: in described step 1), the come in and go out scope of parameter standard of described algorithm interface is the required maximum magnitude of seeing under the current geographical environment in the EMS system, it is geographical background figure scope in the EMS system, retrain with four tiles number and a rectangular extent, on behalf of the superiors, four tiles number to comprise four tile figure under the required maximum geographic range; A rectangular extent is described in four initial range under the tile figure, decides with upper left point coordinate, lower-right most point coordinate, and upper left point coordinate and the two point coordinate scope normalization of lower-right most point coordinate are between (0-1), and input comprises:
The current level of a, N;
B, OUT_SIZE output map chip size;
C, (REQUEST_X, REQUEST_Y) output picture central point; Setting up one is normalization cartesian coordinate system under the initial point with the upper left point of initial range, and output picture central point is the normalization coordinate under this coordinate system.
3. geographic tile figure joining method according to claim 2, it is characterized in that: in described step 2) in, directly determine row of tiles number row scope under the corresponding level by required picture scope and level, by input c in the step 1) and input b and initial rectangular scope, calculate required picture scope rectangle, according to input a and required picture scope rectangle in the step 1), 4 initial environment rectangles are operated the row of tiles columns scope that obtains fast under the corresponding demand level with required picture scope rectangle intersection respectively again.
4. geographic tile figure joining method according to claim 3, it is characterized in that: row of tiles columns computing formula is as follows:
Initial row Row1=f (X
1* 2
N-1), X wherein
1Be required picture scope normalization rectangle upper left corner X-axis coordinate, N is current level, and f () function is for rounding operation;
Initial column Col1=f (Y
1* 2
N-1), Y wherein
1Be required picture scope normalization rectangle upper left corner Y-axis coordinate, N is current level, and f () function is for rounding operation;
End line Row2=f (X
2* 2
N-1), X wherein
2Be required picture scope normalization rectangle lower right corner X-axis coordinate, N is current level, and if f () function is for rounding operation, in addition X
2=1, f () function subtracts 1 again for rounding operation;
End column Col2=f (Y
2* 2
N-1), Y wherein
2Be required picture scope normalization rectangle lower right corner Y-axis coordinate, N is current level, and if f () function is for rounding operation, in addition Y
2=1, f () function subtracts 1 again for rounding operation.
5. according to each described geographic tile figure joining method among the claim 1-4, it is characterized in that: each map tile file name that will obtain step 3) and 4) and file content read memory headroom from disk file after, previous all map tile content cachings are got off, the request next time that offers is used, come then in interface requests next time, again the picture that needs in the preceding buffer memory is taken out directly and use, for a certain tile title, judge whether it exists in a preceding tile memory cache, if exist, then directly from last time obtaining data the tile internal memory, if still do not exist, again from the disk I image content; Delete the tile that the request of this time in the buffer memory not have needs then, add new tile simultaneously to buffer memory, keeping last time, the tile cache contents is up-to-date.
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|---|---|---|---|
| CN 201110190070 CN102254312A (en) | 2011-07-08 | 2011-07-08 | Method for splicing geographical tile graphs |
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|---|---|---|---|
| CN 201110190070 CN102254312A (en) | 2011-07-08 | 2011-07-08 | Method for splicing geographical tile graphs |
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| CN102819671A (en) * | 2012-07-25 | 2012-12-12 | 深圳市网信联动技术有限公司 | Method for carrying out data analysis by combining map |
| CN103000076A (en) * | 2012-11-23 | 2013-03-27 | 山东电力集团公司 | Aerial phone map displaying method meeting power distribution real-time monitoring |
| CN103034677A (en) * | 2012-11-12 | 2013-04-10 | 武大吉奥信息技术有限公司 | Organizing and run coding index method for multidate tile data set |
| CN103065544A (en) * | 2012-12-19 | 2013-04-24 | 江苏省城市规划设计研究院 | Network map rectifying and drawing method under dynamic map projection |
| CN103208225A (en) * | 2012-01-12 | 2013-07-17 | 中国科学院遥感应用研究所 | Tile map manufacturing method and system |
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| CN105354206A (en) * | 2015-06-15 | 2016-02-24 | 中国地质大学（武汉） | Big map cutting based vector data tile map cutting acceleration method |
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| CN103208225B (en) * | 2012-01-12 | 2015-10-28 | 中国科学院遥感应用研究所 | A kind of tile map method for making and system |
| CN102819671B (en) * | 2012-07-25 | 2016-02-17 | 深圳市网信联动通信技术股份有限公司 | A kind of method of carrying out data analysis in conjunction with map |
| CN102819671A (en) * | 2012-07-25 | 2012-12-12 | 深圳市网信联动技术有限公司 | Method for carrying out data analysis by combining map |
| CN103034677A (en) * | 2012-11-12 | 2013-04-10 | 武大吉奥信息技术有限公司 | Organizing and run coding index method for multidate tile data set |
| CN103000076A (en) * | 2012-11-23 | 2013-03-27 | 山东电力集团公司 | Aerial phone map displaying method meeting power distribution real-time monitoring |
| CN103065544A (en) * | 2012-12-19 | 2013-04-24 | 江苏省城市规划设计研究院 | Network map rectifying and drawing method under dynamic map projection |
| CN103065544B (en) * | 2012-12-19 | 2014-08-13 | 江苏省城市规划设计研究院 | Network map rectifying and drawing method under dynamic map projection |
| CN103902573A (en) * | 2012-12-27 | 2014-07-02 | 腾讯科技（深圳）有限公司 | Method and device for displaying traffic line mark maps |
| CN103425754A (en) * | 2013-07-24 | 2013-12-04 | 浙江大学 | Tile-type map service caching real-time dynamic update method applicable to on-line edit of user |
| CN103425754B (en) * | 2013-07-24 | 2016-06-08 | 浙江大学 | Tile type Map Services buffer memory Real-time and Dynamic update method suitable in user's online editing |
| CN103699439B (en) * | 2013-12-30 | 2019-03-05 | 北京奇虎科技有限公司 | A kind of device and method calculating the tile in electronic map visible area |
| CN103699439A (en) * | 2013-12-30 | 2014-04-02 | 北京奇虎科技有限公司 | Device and method for calculating tiles in electronic map visual area |
| CN105302830A (en) * | 2014-07-09 | 2016-02-03 | 方正国际软件(北京)有限公司 | Map tile caching method and apparatus |
| CN105354206A (en) * | 2015-06-15 | 2016-02-24 | 中国地质大学（武汉） | Big map cutting based vector data tile map cutting acceleration method |
| CN105354206B (en) * | 2015-06-15 | 2019-02-01 | 中国地质大学（武汉） | Vector data tile based on big figure cutting cuts out figure accelerated method |
| CN110109751A (en) * | 2019-04-03 | 2019-08-09 | 百度在线网络技术（北京）有限公司 | Distribution method, device and the distribution that distribution cuts figure task cut drawing system |
| CN111915488A (en) * | 2020-08-05 | 2020-11-10 | 成都圭目机器人有限公司 | Method for generating high-performance image tile map under big data |
| CN111915488B (en) * | 2020-08-05 | 2023-11-28 | 成都圭目机器人有限公司 | High-performance image tile graph generation method under big data |
| CN112070775A (en) * | 2020-09-29 | 2020-12-11 | 成都星时代宇航科技有限公司 | Remote sensing image optimization processing method and device, electronic equipment and storage medium |
| CN112070775B (en) * | 2020-09-29 | 2021-11-09 | 成都星时代宇航科技有限公司 | Remote sensing image optimization processing method and device, electronic equipment and storage medium |
| CN114201633A (en) * | 2022-02-17 | 2022-03-18 | 四川腾盾科技有限公司 | Self-adaptive satellite image generation method for unmanned aerial vehicle visual positioning |
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Application publication date: 20111123 |
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