CN101469988A - Cutting method for map vector data in mobile phone network navigation - Google Patents
Cutting method for map vector data in mobile phone network navigation Download PDFInfo
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- CN101469988A CN101469988A CNA2007101441232A CN200710144123A CN101469988A CN 101469988 A CN101469988 A CN 101469988A CN A2007101441232 A CNA2007101441232 A CN A2007101441232A CN 200710144123 A CN200710144123 A CN 200710144123A CN 101469988 A CN101469988 A CN 101469988A
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Abstract
The invention relates to a cutting method for the vector data of mobile phone network navigation map, comprising: dividing a national map into a plurality of map sheets of same area, using the map sheets as units to store the vector data of the national map; determining a map region needed to be cut; calculating all grids covered by the cutting region and storing each grid number; determining the data type displayed in the prior region and the displayed object level of each data type; selecting actual map display objects in the determined region, judging if the display objects are crossed with region boundary, if they are crossed, processing object cutting. The invention can transmit map data after obtaining the request message of mobile phone terminal and satisfying the map display requirements of mobile phone terminal, to reduce the transmission of unnecessary map data, thereby reducing data transmission flux in wireless network, improving transmission speed, and improving map plotting speed on the screen of terminals.
Description
Technical field
The present invention relates to the cutting method of map vector data in a kind of mobile phone network navigation.
Technical background
The mobile phone GPS navigation system is divided into two kinds of mobile phone autonomous navigation system and mobile phone network navigation systems now basically.In the mobile phone network navigation system, because the charge of operator is associated with the data flow transmitted amount, so the flow control of map vector data transmission is a difficult point.
The cutting of map vector data is divided into static and dynamically cuts two kinds.Wherein static cutting is according to fixing engineer's scale size and mobile phone screen size, map is cut in advance the map sheet of fixed size, plurality of specifications, when the user asks, directly transferring corresponding data distributing shows to terminal, the advantage of this method is that the realization of programmed algorithm is simple relatively, map server is to video data treatment effeciency height, and shortcoming is that the data traffic that produces in transmission course of video data is big; Dynamically cutting is then to be demand according to the cellphone subscriber, dynamic cutting meets the map vector data of user's request and is issued on the mobile phone terminal and shows, advantage is to have reduced data traffic in the transmission course of data, shortcoming is that programmed algorithm is complicated, has increased the map server treatment effeciency a little.What the cutting of map vector data was adopted in the mobile phone network navigation now is dynamic cutting mode.
Dynamically cutting is divided into incomplete cutting and cuts two kinds fully: not exclusively cutting refers to the solicited message of map server according to mobile phone terminal, after determining the indication range of map, obtain corresponding map datum, show with regard to directly being issued to terminal without line clipping and block cutting, advantage is that processing speed is fast, shortcoming be delivery flow rate a little more greatly, fully the cutting then just opposite.
Summary of the invention
The present invention seeks in order to overcome above-mentioned weak point, provide a kind of in mobile phone network navigation the cutting method of map vector data, this method is to have adopted dynamic cutting mode fully, can reduce unnecessary map datum downloads on the mobile phone terminal, thereby reduced the flow of data transmission in the wireless network, also improved the speed of on the terminal screen map being drawn simultaneously.
The cutting method of map vector data in a kind of mobile phone network navigation of the present invention may further comprise the steps:
(1) national map area is divided into equal-sized several map sheets, national map vector data is that unit carries out data storage with the map sheet;
(2) the definite map area scope that will cut;
(3) all grids that calculate cutting zone and covered, and preserve each grid number;
(4) need in the current region scope to determine object grade to display in data presented type and each data type;
(5) be chosen in concrete map display object in the determined regional extent, judge whether this display object and zone boundary intersect, then carry out object cutting processing if intersect.
The described rectangular extent that comprises national map area is, 73.381041 °～135.129819 ° of lateral coordinates scopes, 18.080491 °～53.584553 ° of along slope coordinate scopes, when carrying out sheet line system, according to State Standard of the People's Republic of China " national primary scale topomap framing and numbering---GB/T 13989-92 ", select the framing standard (through differing from 7 ' 30 ", the meridional difference 5 ') of 1:10 ten thousand, nationwide rectangular area is divided into 426
OKX 496
RowIndividual map sheet, and to these map sheets according to " from top to bottom, from left to right " mode is numbered;
Described data storage is to read the vector data in each city, the whole nation according to framing and numbering principle, and the vector data of various data types in each city, the whole nation is stored according to the order of sheet designation and the storage format of file;
Determining of described map vector data cut coverage, be meant latitude and longitude coordinates and the current to display proportional range size of mobile phone network navigation map server according to mobile phone terminal screen size and terminal position, obtain mobile phone terminal screen display scope by calculating, thus the viewing area scope that acquisition will be cut;
Need the object grade to display in data presented type and each data type in described definite current region scope, refer under certain proportional range, need the rank of display object in the type of displayed map vector data and each data type;
After the described map datum type of determining to need to show in good viewing area scope and this regional extent and the demonstration rank in each type, all map sheets in the scope of viewing area are handled one by one, obtain the data object that each map sheet comprises, each display object is judged, relatively whether each object is in the viewing area, if the data object that is compared is in the viewing area, then preserve these data, if intersect data object that is compared and zone boundary, then this display object is carried out dividing processing, if data object relatively and zone boundary without any intersect or comprise and involved relation, then this object is not carried out any processing.
The cutting of described data object is for road data and block data, when intersect on the border in this data object and zone,, obtain the coordinate of joining by the crossing algorithm of line segment and line segment, and intercept the partial data of this object in its viewing area, form new data object.
Owing to adopted the cutting method of map vector data in a kind of mobile phone network navigation of the present invention, by obtaining the solicited message of mobile phone terminal, satisfy in advance under the prerequisite of mobile phone terminal map display requirement and transmit map datum, having reduced other unnecessary map datums to the full extent downloads on the mobile phone terminal, thereby reduced the flow of data transmission in the wireless network, improved transmitting speed, also improved the speed of on the mobile phone terminal screen map being drawn simultaneously.
Description of drawings
Fig. 1 is presented at the demonstration situation of different types of data and same categorical data different brackets under the different proportion chi for map among the present invention;
Fig. 2 is the file memory format of map vector data among the present invention.
Embodiment
An instantiation of map vector data cutting method comprises the steps: in a kind of mobile phone network navigation of the present invention
1) national map grid dividing
The rectangular extent of whole nation map area is, 73.381041 °～135.129819 ° of lateral coordinates scopes, 18.080491 °～53.584553 ° of along slope coordinate scopes, when carrying out sheet line system, according to State Standard of the People's Republic of China " national primary scale topomap framing and numbering---GB/T13989-92 ", select the framing standard (through differing from 7 ' 30 ", the meridional difference 5 ') of 1:10 ten thousand, nationwide rectangular area is divided into 426
OKX496
RowIndividual map sheet, each map sheet equal and opposite in direction, and to these map sheets according to " from top to bottom, from left to right " mode is numbered.
2) map vector data storing mode
Read the vector data in each city, the whole nation according to framing and numbering principle, and be kept in the internal memory, the vector data of each each data type of city of the whole nation is stored according to the order of sheet designation and the storage format of file, file memory format sees Fig. 2 for details.
3) determine cut coverage
The map server of navigation center is according to the latitude and longitude coordinates and the current engineer's scale size to display of mobile phone terminal screen size and terminal position, by the maximum and minimum latitude and longitude value of calculating acquisition mobile phone terminal screen display scope, thus the viewing area scope that acquisition will be cut;
Screen size refers to the pixel value of mobile phone terminal display screen, with how many how many pixels of pixel X ordinate direction of horizontal ordinate direction represents usually.
4) obtain map sheet number
The scope of map display area is in case establish, the latitude and longitude coordinates that the upper left corner by this regional extent and the lower right corner are 2, judge the map sheet number under this two point coordinate, according to the framing of map sheet and the storage mode of numbering principle and national map vector, calculate and preserve all map sheets that the current region scope is comprised.
5) display type grade
Because the screen of same size adopts different magnitude proportion chis, the scope that its map shows is different, the scope of the big more displayed map of engineer's scale is also just big more, need the map vector data of demonstration also just many more, so cause processing speed to descend, memory consumption increases, and the delivery flow rate of data increases in mobile phone network navigation; So need be arranged on the rank (seeing Fig. 1 for details) of display object under the type that needs the displayed map vector data under certain engineer's scale and each data type.
6) obtain video data
After the map datum type of having determined to need to show in viewing area scope and this regional extent and the demonstration rank in each type, all map sheets in the scope of viewing area are handled one by one, obtain the data object that each map sheet comprises, each display object is judged, relatively whether each object is in the viewing area, if the data object that is compared is in the viewing area, then preserve these data, if intersect data object that is compared and zone boundary, then this display object is carried out dividing processing, if data object relatively and zone boundary without any intersect or comprise and involved relation, then this object is not carried out any processing;
The cutting of data object mainly is for road data and block data, when intersect on the border in this data object and zone, crossing algorithm by line segment and line segment, obtain the coordinate of joining, and intercept the partial data of this object in its viewing area, form new data object, thereby reach the cutting effect, the purpose of display object being carried out cutting is the data traffic that produces in data transmission procedure in order to reduce.
The above only is preferred embodiment of the present invention, 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 (7)
1, a kind of cutting method of mobile phone network navigation map vector data is characterized in that:
(1) national map area is divided into equal-sized several map sheets, national map vector data is that unit carries out data storage with the map sheet;
(2) the definite map area scope that will cut;
(3) all grids that calculate cutting zone and covered, and preserve each grid number;
(4) in the current region scope, need to determine object grade to display in data presented type and each data type;
(5) be chosen in concrete map display object in the determined regional extent, judge whether this display object and zone boundary intersect, then carry out object cutting processing if intersect.
2, the cutting method of a kind of mobile phone network navigation map vector data according to claim 1, it is characterized in that: described national sheet line system principle is, according to State Standard of the People's Republic of China " national primary scale topomap framing and numbering---GB/T
13989-92 ", select the framing standard (through differing from 7 ' 30 ", the meridional difference 5 ') of 1:10 ten thousand, nationwide rectangular area is divided into 426
OKX496
RowIndividual map sheet, and to these map sheets according to " from top to bottom, from left to right " mode is numbered.
3, the cutting method of a kind of mobile phone network navigation map vector data according to claim 1, it is characterized in that: described data storage is to read the vector data in each city, the whole nation according to framing and numbering principle, and the vector data of various data types in each city, the whole nation is stored according to the order of sheet designation and the storage format of file.
4, the cutting method of a kind of mobile phone network navigation map vector data according to claim 1, it is characterized in that: the determining of described map vector data cut coverage, be meant latitude and longitude coordinates and the current to display proportional range size of the map server of navigation center according to mobile phone terminal screen size and terminal position, obtain mobile phone terminal screen display scope by calculating, thus the viewing area scope that acquisition will be cut.
5, the cutting method of a kind of mobile phone network navigation map vector data according to claim 1, it is characterized in that: need the object grade to display in data presented type and each data type in described definite current region scope, refer under certain proportional range, need the rank of display object in the type of displayed map vector data and each data type.
6, the cutting method of a kind of mobile phone network navigation map vector data according to claim 1, it is characterized in that: after the described map datum type of determining to need to show in good viewing area scope and this regional extent and the demonstration rank in each type, all map sheets in the scope of viewing area are handled one by one, obtain the data object that each map sheet comprises, each display object is judged, relatively whether each object is in the viewing area, if the data object that is compared is in the viewing area, then preserve these data, if intersect data object that is compared and zone boundary, then this display object is carried out dividing processing, if data object relatively and zone boundary without any intersect or comprise and involved relation, then this object is not carried out any processing.
7, the cutting method of a kind of mobile phone network navigation map vector data according to claim 1, it is characterized in that: the cutting of data object is for road data and block data, when intersect on the border in this data object and zone, crossing algorithm by line segment and line segment, obtain the coordinate of joining, and intercept the partial data of this object in its viewing area, form new data object.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101968889A (en) * | 2009-07-28 | 2011-02-09 | 日电（中国）有限公司 | Methods and systems for forming picture and preprocessing picture |
| CN102801797A (en) * | 2012-08-03 | 2012-11-28 | 北京世纪高通科技有限公司 | Method and device for processing traffic information of mobile internet |
| CN102880681A (en) * | 2012-09-13 | 2013-01-16 | 烽火通信科技股份有限公司 | Method for displaying and managing grid-based vector data with large data size |
| CN105427330A (en) * | 2015-12-21 | 2016-03-23 | 中科宇图科技股份有限公司 | Random multi-proportion partition method of vector polygon |
| CN105516311A (en) * | 2015-12-09 | 2016-04-20 | 中国农业银行股份有限公司 | Electronic map panorama acquisition method and system |
| CN109036096A (en) * | 2017-06-08 | 2018-12-18 | 腾讯科技（深圳）有限公司 | A kind of map is slotting along the line to put a control method and device |
| CN115048013A (en) * | 2022-07-29 | 2022-09-13 | 浙江吉利控股集团有限公司 | Method and device for determining map and electronic equipment |
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| JP4004818B2 (en) * | 2002-02-28 | 2007-11-07 | 松下電器産業株式会社 | Position information transmission apparatus and method |
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| CN101968889A (en) * | 2009-07-28 | 2011-02-09 | 日电（中国）有限公司 | Methods and systems for forming picture and preprocessing picture |
| CN102801797A (en) * | 2012-08-03 | 2012-11-28 | 北京世纪高通科技有限公司 | Method and device for processing traffic information of mobile internet |
| CN102880681A (en) * | 2012-09-13 | 2013-01-16 | 烽火通信科技股份有限公司 | Method for displaying and managing grid-based vector data with large data size |
| CN102880681B (en) * | 2012-09-13 | 2016-01-13 | 烽火通信科技股份有限公司 | Based on display and the management method of the big data quantity vector data of grid |
| CN105516311A (en) * | 2015-12-09 | 2016-04-20 | 中国农业银行股份有限公司 | Electronic map panorama acquisition method and system |
| CN105516311B (en) * | 2015-12-09 | 2019-03-05 | 中国农业银行股份有限公司 | A kind of electronic map panorama picture capturing method and system |
| CN105427330A (en) * | 2015-12-21 | 2016-03-23 | 中科宇图科技股份有限公司 | Random multi-proportion partition method of vector polygon |
| CN109036096A (en) * | 2017-06-08 | 2018-12-18 | 腾讯科技（深圳）有限公司 | A kind of map is slotting along the line to put a control method and device |
| CN115048013A (en) * | 2022-07-29 | 2022-09-13 | 浙江吉利控股集团有限公司 | Method and device for determining map and electronic equipment |
| CN115048013B (en) * | 2022-07-29 | 2022-12-02 | 浙江吉利控股集团有限公司 | Method and device for determining map and electronic equipment |
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| CN101469988B (en) | 2012-06-13 |
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