CN1710554A - Method for presenting map information and method for transmitting map information data - Google Patents
Method for presenting map information and method for transmitting map information data Download PDFInfo
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- CN1710554A CN1710554A CN 200410040014 CN200410040014A CN1710554A CN 1710554 A CN1710554 A CN 1710554A CN 200410040014 CN200410040014 CN 200410040014 CN 200410040014 A CN200410040014 A CN 200410040014A CN 1710554 A CN1710554 A CN 1710554A
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- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000010295 mobile communication Methods 0.000 description 5
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- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The invention for expressing point element in map information includes steps: determining central reference point, expressing object point by using difference between coordinate of object point and coordinate of central point. Advantages are: small data quantity, simple format convenient for mobile terminal to do calculation and operation. The method discards some functions not possible to be realized at mobile terminal. Compared with transmission quantity in general format, the transmission quantity of map data between mobile terminal and server in the disclosed simple format is lowered more than 2/3. Thus, transmission time is saved, transmission expense is lowered, and display time is improved.
Description
Technical Field
The present invention relates to computer technology, and more particularly to information technology for mobile communication network transmission.
Background
The existing electronic map format is specific to a computer for many times, and the coverage range can adapt to the whole world. Such as mif file of Mapinfo company in typical electronic map format, SHP file structure of Russian ESRI company. The coordinate points in these formats are directly expressed in latitude and longitude coordinates, which results in a relatively large amount of data. It is a waste for the mobile communication users with low communication rate and high communication cost. And also causes the mobile communication terminal to consume much time in processing the map data. The following is an example of a face block MIF file (the text after the asterisk is illustrative). A certain layer of the electronic map is represented by two files: mif and mid.
Version of Version 300 MIF file
Charset "Windows SimChinese". character encoding
Delimiter "," separator ",
CoordSys Earth project 1, 0 coordinate system
Column 1 associated text attribute (stored in corresponding mid file)
NAME Char(60)
Data coordinate Data
Region 1. one Region
12 total 12 dots
104.10257730.713125 points by coordinates
104.102692 30.713181
104.102783 30.713181
104.102837 30.71315
10.4102837 30.713081
104.102814 30.712997
104.102692 30.712965
104.102661 30.71295
104.1026 30.712955
104.102562 30.713009
104.102562 30.713066
104.102577 30.713125
Pen (1, 2, 1369340) for drawing the stroke number of the region
Brush (2, 1369340, 1369340) selected from Brush
Center 104.10269930.713065 Center point position
Region 1. another block
15
104.101364 30.711365
104.101486 30.711372
104.101624 30.711422
104.101685 30.711348
104.101723 30.711197
104.1017 30.711016
104.101997 30.71084
104.10218 30.710716
104.102158 30.710674
104.101753 30.710653
104.10144 30.71064
104.101196 30.710756
104.101128 30.710966
104.101074 30.711348
104.101364 30.711365
Pen(1，2，1369340)
Brush(2，1369340，1369340)
Center 104.101627 30.711031
mid file
"Shahe" corresponds to the name of the first area of the mif file
"Fuhe" corresponds to the name of the second area of the mif file
It can be seen that the format of the mif file is complete but cumbersome, and such a format is not suitable for mobile terminals due to the limited computing and display capabilities of mobile terminals.
Disclosure of Invention
The invention aims to solve the technical problem of providing a map information expression method with small data volume and simple format.
The technical scheme adopted by the invention for solving the technical problem is to provide a method for representing map information, wherein the method for representing point elements at least comprises the following steps: and determining a central reference point, and expressing the target point by using the difference between the coordinates of the target point and the coordinates of the central point.
Further comprising the steps of: and marking the name of the target point.
The method for expressing the line element at least comprises the following steps:
determining a central reference point, and expressing the first target point by the difference between the coordinate of the first target point and the coordinate of the central point;
expressing the second target point by the difference between the coordinates of the second target point and the coordinates of the first target point,
......
expressing the Nth target point by the difference between the coordinates of the Nth target point and the coordinates of the (N-1) th target point,
connecting the first, second.. th (N-1) and Nth target points to form a line element.
The connection is sequentially connecting a first target point, a second target point, (N-1) and an Nth target point to form a line element. Further comprising the steps of: the name of the line element is noted.
The invention describes the bin elements according to the following steps:
determining a central reference point, and expressing the first target point by the difference between the coordinate of the first target point and the coordinate of the central point;
expressing the second target point by the difference between the coordinates of the second target point and the coordinates of the first target point,
......
expressing the Nth target point by the difference between the coordinates of the Nth target point and the coordinates of the (N-1) th target point,
and connecting the first, second, third and fourth target points to form a closed curve, wherein the area in the closed curve is the surface element. The connection is in sequence. The name of the bin element is also noted.
The invention also provides a method for transmitting map information data, wherein the transmitted data packet at least comprises one of the following data: point elements expressed in relative coordinates; line elements formed by target points expressed by relative coordinates; the surface elements are composed of target points expressed in relative coordinates. The transmitted data packet also has the type identification and the name of the map element, and the map element information is restored at the client. The "relative coordinates" are the difference between the absolute coordinates (longitude and latitude) of one point and the absolute coordinates (longitude and latitude) of another point, for example, the geographic coordinates of the point a are (a1, B1), the geographic coordinates of the point B are (a2, B2), and the relative coordinates are (a2-a1, B2-B1).
The method has the advantages that the data size is small, and the same map needs to be represented by fewer bits. The format is simple, and the operation and operation on the mobile terminal are convenient. And some functions which cannot be realized on the mobile terminal are abandoned. The display of all city maps can be realized. The mobile terminal has many limitations in using the electronic map. Due to the limitation of the storage capacity thereof, the electronic map data cannot be stored in the terminal. Only by adopting the C/S mode, the map data is put on the server, and the mobile terminal accesses the map data. Therefore, the map data transmission is needed between the mobile terminal and the server, after the data format is adopted, the transmitted data volume is more than 2/3 smaller than that of the common format, the transmission time is greatly saved, and simultaneously, the mobile communication data charging is carried out according to the data flow, so that the transmission cost is greatly reduced. The reduction in the amount of data also improves the display time of the map on the mobile communication terminal.
The invention is further described with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a flow chart of one embodiment of the present invention.
Detailed Description
First, map elements are categorized into three categories: point, line, plane. The attributes of single lines or double lines are not divided in the lines, and the attributes are classified into irregular single lines; the plane can not distinguish the quadrilateral ellipse and the irregular area any more, and can be classified into the processing method of the irregular area. Each time a map is accessed, a central coordinate point is identified, and other coordinates are converted into relative coordinates with the central coordinate point as an origin. And regarding the line or the plane, the coordinate value of the previous point is subtracted from the coordinate of the next point by taking the first point as a starting point to be used as the coordinate of the next point. Therefore, the data volume can be greatly reduced, and meanwhile, the confidentiality of the data is greatly enhanced because only the relative coordinate value exists in the downlink data. While the absolute coordinates of longitude and latitude are not concerned when the client displays, the map can be reproduced only by the relative coordinates.
The invention adopts the following method to express point elements in map information: and determining a central reference point, expressing the target point by using the difference between the coordinate of the target point and the coordinate of the central point, and labeling the name of the target point. Such as: if the longitude and latitude coordinates of the center reference point are (a, b) and the coordinates of the target point are (a + x, b + y), the position of the target point can be expressed by (x, y) and the name of the point is attached when the center reference point is determined.
As shown in fig. 1, the present invention adopts the following method to express line elements in map information: determining a center reference point, expressing the first target point by the difference between the coordinate of the first target point and the coordinate of the center point, expressing the second target point by the difference between the coordinate of the second target point and the coordinate of the first target point, expressing the third target point by the difference between the coordinate of the third target point and the coordinate of the second target point until the last target point, and labeling the name of the line element. Such as: the longitude and latitude coordinates of the center reference point are (a, b), the coordinates of the first target point are (a + x1, b + y1), the coordinates of the second target point are (a + x1+ x2, b + y1+ y2), the position of the second target point can be expressed by (x2, y2), the coordinates of the third target point are (a + x1+ x2+ x3, b + y1+ y2+ y3), the position of the third target point can be expressed by (x3, y3), and the like, and finally, the points are connected to form a line, and information such as the name and the color of the line element is attached to the line element, so that the complete line element is formed. Surface element similarly, the area within the closed curve constitutes a surface element.
The map information recorded according to the method of the present invention becomes a new recording format, and includes information of element type code, position, color, name, etc. in one information packet, the position is the positional relationship expressed according to the method of the present method.
The method for transmitting the map information data of the invention is characterized in that the transmitted data packet is also provided with the type identification and the name of the map element, and the map element information is restored at the client. The 'recovery' is the reverse push according to the method of the invention, and the information in the data packet is processed and displayed in the form of a map. Taking a line element as an example, drawing a first target point according to the coordinates of the central reference point and the parameters of the first target point, for example, the relative coordinates of the first target point relative to the central reference point, drawing a second target point according to the parameters of the second target point, and finally connecting the points.
The method of the present invention is used to express map information, a new format is generated, and the structure of the format of the present invention is further explained below by way of an example.
Let the center point coordinate be (3071300, 10410200)
A. Point elements: 10, 0, 0, 0, 1, -1335, 530, "Chengdu XXX Corp.", et al
The above items are explained below:
10 is an element type code, indicating that the element is a point;
0, 0, 0 represents the numerical value of the colors red, green, blue of the element;
-1335, 530 represents the relative coordinates of the point with respect to the center, i.e. the difference of the latitude and longitude coordinates of the point and the coordinates of the center point;
"Chengdu XXX company" is the name of the point.
B. Line elements:
the information packet comprises the following contents:
20, 144, 144, 255, 1, 105, 0, 2, 6, -1669, -5890, "south of the people"
Wherein,
20 is an element type code, indicating that the element is a line;
144, 144, 255 represent the color of the element as a red, green and blue numerical value;
1 represents a type such as a railway, a highway, or the like;
105, 0 for standby;
2 represents a display width of a line;
7 indicates that the element is composed of 7 points in total;
-1669 latitude of origin relative to center point;
-5890 longitude of the origin relative to the centre point;
"south of the people" means the name of the element, and the length is unequal.
C. Surface element
30, 20, 228, 252, 1, 0, 12, 12, 58, "shahe
Wherein:
30 indicates that the element is a face;
20, 228, 252 represents a numerical value in which the color of the element is red, green and blue;
1 represents a characteristic attribute of an element, such as a green land, river, park, etc.;
0, standby;
12 indicates that the element is composed of 12 points in total;
12 latitude of the starting point relative to the center point;
longitude of the 58 origin relative to the center point;
the "sand river" represents the name of an element, and the length is not equal.
The position of the map information in the server is expressed by longitude and latitude, and the map information is expressed by the method for expressing the map information when being downloaded.
The line elements and the surface elements are connected by a plurality of discrete points, and the differences between the first point, the second point, and the connection sequence of the points are not substantial, i.e., the differences are only expressed even if the first point, the third point, the second point, and the like are connected in the sequence. The present invention is to describe the second point by the difference between the second point and the first point, the third point by the difference between the third point and the second point, and the fourth point by the difference between the fourth point and the third point.
Claims (10)
1. Method for representing map information, characterized in that the representation point elements comprise at least the following steps: and determining a central reference point, and expressing the target point by using the difference between the coordinates of the target point and the coordinates of the central point.
2. The method of representing map information of claim 1, further comprising the steps of: and marking the name of the target point.
3. Method for representing map information, characterized in that the line elements are represented, comprising at least the following steps:
determining a central reference point, and expressing the first target point by the difference between the coordinate of the first target point and the coordinate of the central point;
expressing the second target point by the difference between the coordinates of the second target point and the coordinates of the first target point,
……
expressing the Nth target point by the difference between the coordinates of the Nth target point and the coordinates of the (N-1) th target point,
connecting the first, second.. th (N-1) and Nth target points to form a line element.
4. The method of representing map information of claim 2, wherein the first, second.. th (N-1) and nth target points are connected in sequence to constitute a line element.
5. The method of expressing map information of claim 3 or 4, further comprising the steps of: the name of the line element is noted.
6. Method for representing map information, characterized in that surface elements are represented according to the following steps:
determining a central reference point, and expressing the first target point by the difference between the coordinate of the first target point and the coordinate of the central point;
expressing the second target point by the difference between the coordinates of the second target point and the coordinates of the first target point,
……
expressing the Nth target point by the difference between the coordinates of the Nth target point and the coordinates of the (N-1) th target point,
and connecting the first, second, third and fourth target points to form a closed curve, wherein the area in the closed curve is the surface element.
7. The method of representing map information of claim 6, wherein the first, second.. th (N-1), nth, first target points are connected in sequence to constitute a bin element.
8. The method of representing map information of claim 6 or 7, further labeling names of said bins.
9. The method for transmitting map information data is characterized in that the transmitted data packet at least comprises one of the following data:
point elements expressed in relative coordinates;
line elements formed by target points expressed by relative coordinates;
the surface elements are composed of target points expressed in relative coordinates.
10. The method of transmitting map information data according to claim 9, wherein the transmitted data packet further has a type identifier and a name of the map element, and the map element information is restored at the client.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410040014 CN1710554A (en) | 2004-06-17 | 2004-06-17 | Method for presenting map information and method for transmitting map information data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410040014 CN1710554A (en) | 2004-06-17 | 2004-06-17 | Method for presenting map information and method for transmitting map information data |
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| Publication Number | Publication Date |
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| CN1710554A true CN1710554A (en) | 2005-12-21 |
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| CN 200410040014 Pending CN1710554A (en) | 2004-06-17 | 2004-06-17 | Method for presenting map information and method for transmitting map information data |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211332B (en) * | 2006-12-26 | 2010-08-11 | 富士施乐株式会社 | Installation location management system |
| CN102252685A (en) * | 2010-05-21 | 2011-11-23 | 科菱航睿空间信息技术有限公司 | Navigation electronic map data processing method and storage method based on same |
| CN104321619B (en) * | 2012-03-16 | 2016-08-17 | 观致汽车有限公司 | Locally map rejuvenation |
| CN109299311A (en) * | 2018-09-18 | 2019-02-01 | 甘肃启远智能科技有限责任公司 | Photovoltaic module longitude and latitude data configuration method and device |
| CN110084877A (en) * | 2011-09-26 | 2019-08-02 | 谷歌有限责任公司 | Map element is managed using aggregation features identifier |
| CN113766427A (en) * | 2021-10-09 | 2021-12-07 | 大连中正联科通信有限公司 | Loss monitoring device and loss prevention pre-alarm system for marine container |
-
2004
- 2004-06-17 CN CN 200410040014 patent/CN1710554A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101211332B (en) * | 2006-12-26 | 2010-08-11 | 富士施乐株式会社 | Installation location management system |
| CN102252685A (en) * | 2010-05-21 | 2011-11-23 | 科菱航睿空间信息技术有限公司 | Navigation electronic map data processing method and storage method based on same |
| CN110084877A (en) * | 2011-09-26 | 2019-08-02 | 谷歌有限责任公司 | Map element is managed using aggregation features identifier |
| CN104321619B (en) * | 2012-03-16 | 2016-08-17 | 观致汽车有限公司 | Locally map rejuvenation |
| CN109299311A (en) * | 2018-09-18 | 2019-02-01 | 甘肃启远智能科技有限责任公司 | Photovoltaic module longitude and latitude data configuration method and device |
| CN113766427A (en) * | 2021-10-09 | 2021-12-07 | 大连中正联科通信有限公司 | Loss monitoring device and loss prevention pre-alarm system for marine container |
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