CN104048659B - The conversion method and system of map coordinates system - Google Patents
The conversion method and system of map coordinates system Download PDFInfo
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Abstract
The present invention provides a kind of conversion method and system of map coordinates system, and wherein method includes step：Coordinate points A are taken from the body of a map or chart of current map coordinate system, the origin of two-dimensional coordinate system is set to；Translation operation is carried out to coordinate points A using coordinates transformation method and obtains coordinate points A ', and obtain coordinate points A ' with regard to mirror image coordinate points B on y=x axis of symmetry；Wherein, the longitudinal axis of the y for two-dimensional coordinate system, transverse axis of the x for two-dimensional coordinate system；The transformed coordinate point B ' that translation operation is obtained is carried out according to the coordinates transformation method and mirror image coordinate points B；The conversion of map coordinates system is carried out according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '.Present invention achieves the longitude and latitude between multiple geographic coordinate systems is mutually freely changed, effective and feasible method for correcting error is provided for coordinate system AES, longitude and latitude between different maps difference SDK can be modified, improve the degree of accuracy and work efficiency of cartographic information collection.
Description
Technical field
The present invention relates to GIS applied technical fields, the conversion method and system of more particularly to a kind of map coordinates system.
Background technology
In existing Orientation on map function, by using GPS (Global Positioning System：Global Satellite
Alignment system) and AGPS (Assisted Global Positioning System：Auxiliary global satellite positioning system) carry out
Positioning, this positioning mode is possible to be blocked by building or network condition is not good causes deviations larger or even cannot
The problem of positioning.In order to solve the error problem that coordinate system is caused on map, one correction data of extra importing are generally required
Storehouse is rectified a deviation to the position of base station, recalculates the coordinate of map.
In the map coordinates system for being used at present, mainly including WGS-84 (World Geodetic System mono-
1984Coordinate System) coordinate system, GCJ-02 Mars coordinate systems (by China's National Bureau of Surveying and Mapping work out geography information
The coordinate system of system), Baidu map BD-09 coordinate system, search dog coordinate system etc..These coordinate systems in use, need
Carry out the conversion of coordinate system.For example, require at least to use GCJ-02 coordinate-systems at home, other coordinate systems be all by
GCJ-02 coordinate systems were entered migration algorithm and were obtained.Map supply business typically just provides and the seat of itself is transformed into by other coordinate systems
Mark system AES, abbreviation coordinates transformation method, due to the nonstandardized technique of data, by limiting to that coordinate system arbitrarily can not be changed,
Freely changing for longitude and latitude cannot be accomplished between coordinate system, while the data obtained in drive test can not be widely used in other seats
In the GIS applications of mark system, these have all had a strong impact on the degree of accuracy and work efficiency of cartographic information collection.
The content of the invention
Based on this, it is necessary to for above-mentioned technical problem, there is provided a kind of conversion method and system of map coordinates system, can be with
Realize freely changing between different coordinates longitude and latitude.
A kind of conversion method of map coordinates system, comprises the steps：
Coordinate points A are taken from the body of a map or chart of current map coordinate system, the origin of two-dimensional coordinate system is set to；
Translation operation is carried out to coordinate points A using coordinates transformation method and obtains coordinate points A ', and obtain coordinate points A ' with regard to y
Mirror image coordinate points B on=- x axis of symmetry；Wherein, the longitudinal axis of the y for two-dimensional coordinate system, transverse axis of the x for two-dimensional coordinate system；
The transformed coordinate point B ' that translation operation is obtained is carried out according to the coordinates transformation method and mirror image coordinate points B；
The conversion of map coordinates system is carried out according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '.
Coordinate points choose module, for taking coordinate points A from the body of a map or chart of current map coordinate system, are set to two dimension
The origin of coordinate system；
First modular converter, obtains coordinate points A for carrying out translation operation to coordinate points A using coordinates transformation method ', and
Obtain coordinate points A ' with regard to mirror image coordinate points B on y=-x axis of symmetry；Wherein, the longitudinal axis of the y for two-dimensional coordinate system, x are two dimension seat
The transverse axis of mark system；
Second modular converter, obtains for carrying out translation operation according to the coordinates transformation method and mirror image coordinate points B
The transformed coordinate point B ' for arriving；
Longitude and latitude modular converter, carries out map for the longitude and latitude corresponding relation according to coordinate points A with transformed coordinate point B '
The conversion of coordinate system.
The conversion method and system of above-mentioned map coordinates system, using coordinates transformation method to choosing from current map coordinate system
Coordinate points A carry out translation operation and obtain coordinate points A ', and obtain coordinate points A ' with regard to the mirror image coordinate points on y=-x axis of symmetry
B, then the transformed coordinate point B ' obtained by translation operation, and then closed by coordinate points A are corresponding with the longitude and latitude of transformed coordinate point B '
System carries out the conversion of map coordinates system.The longitude and latitude realized between multiple geographic coordinate systems is mutually freely changed, and is coordinate system
AES provides effective and feasible method for correcting error, the longitude and latitude between different maps difference SDK can be modified, be carried
The degree of accuracy and work efficiency of high cartographic information collection.
Description of the drawings
Conversion method flow charts of the Fig. 1 for the map coordinates system of one embodiment；
Fig. 2 is coordinate points transition diagram in the transformation process of map coordinates system；
Fig. 3 is coordinate point set F schematic diagram；
Conversion system structure schematic diagrams of the Fig. 4 for the map coordinates system of one embodiment.
Specific embodiment
The present invention proposes a kind of conversion method and system of map coordinates system, mainly realizes between map coordinates system
Coordinate Conversion, WGS-84 coordinate systems that for example GPS global positioning satellite is used, hundred degree of coordinate systems of BD-09, GCJ-02 Mars coordinates
Between multiple coordinate systems such as system, search dog coordinate system, the mutual of longitude and latitude is freely changed.Coordinate system AES can be corrected on ground
The error caused on figure, is effectively improved the degree of accuracy and work efficiency of cartographic information collection.
Detailed is made to the conversion method of map coordinates system and the specific embodiment of system of the present invention below in conjunction with the accompanying drawings
Description.
Described in reference diagram 1, Fig. 1 is the conversion method flow chart of the map coordinates system of one embodiment, comprises the steps：
Step S101, takes coordinate points A from the body of a map or chart of current map coordinate system, is set to the original of two-dimensional coordinate system
Point.
In this step, a coordinate points can be chosen by the effective range of the map provided in map supply business,
The origin of the two-dimensional coordinate system of setting is set to, by taking hundred degree of coordinate systems of BD-09 and general WGS-84 coordinate systems as an example, to work as
Front map coordinates system be hundred degree coordinate systems of BD-09, then WGS-84 coordinate systems be coordinate system to be converted, Baidu map supplier offer
Changed by WGS-84 coordinate systems to the coordinates transformation method of hundred degree of coordinate systems of BD-09.With reference to shown in Fig. 2, Fig. 2 is map coordinates system
Transformation process in coordinate points transition diagram, coordinate points A are the coordinate chosen from the body of a map or chart of current map coordinate system
Point, in shown two-dimensional coordinate system, coordinate points A (0, it is 0) origin.
Coordinate points A are carried out translation operation using coordinates transformation method and obtain coordinate points A by step S102 ', and obtain coordinate
Point A ' is with regard to mirror image coordinate points B on y=-x axis of symmetry；Wherein, the longitudinal axis of the y for two-dimensional coordinate system, horizontal strokes of the x for two-dimensional coordinate system
Axle.
In this step, assume that coordinate points A are a bit in coordinate system to be converted, obtain coordinate points A ' with regard to y=-x
Mirror image coordinate points B on axis of symmetry, as illustrated in fig. 2, it is assumed that coordinate points A ' in the first quartile of two-dimensional coordinate system, mirror image coordinate points
Third quadrants of the B in two-dimensional coordinate system.Described above WGS-84 coordinate systems, arrive current map using what map supply business provided
Coordinates transformation method coordinates computed point A ', such as above-mentioned WGS-84 coordinate systems are changed to the coordinate system of hundred degree of coordinate systems of BD-09 and are changed
Algorithm, it is assumed that coordinate points A of hundred degree of coordinate systems of BD-09 are a bit in WGS-84 coordinate systems, then fasten and ask in two-dimensional coordinate
Go out coordinate points A ' with regard to mirror image coordinate points B on y=-x axis of symmetry, such as scheme.
Step S103, carries out the conversion that translation operation is obtained according to the coordinates transformation method and mirror image coordinate points B
Coordinate points B '.
In this step, assume that coordinate points B are a bit in coordinate system to be converted, recycle same Coordinate Conversion to calculate
Method, mirror image coordinate points B to above obtaining carry out translation operation, obtain the transformed coordinate point B ' of coordinate system to be converted, in such as Fig. 2
It is shown, after coordinates transformation method is calculated again, transformed coordinate point B ' can fall coordinate points A (0,0) near, transformed coordinate point
B ' is the coordinate points after correction.Such as above-mentioned WGS-84 coordinate systems, changed to hundred degree of seats of BD-09 using WGS-84 coordinate systems
Coordinate points B are carried out the transformed coordinate point B ' that translation operation is obtained by the coordinates transformation method of mark system again, and transformed coordinate point B ' is i.e.
Coordinate points A for hundred degree of coordinate systems of BD-09 correspond to the coordinate points in WGS-84 coordinate systems after correction.
In one embodiment, the step of carrying out translation operation for step S103, specifically can be as follows：
In the set point centered on mirror image coordinate points B, each seat is calculated respectively using the coordinates transformation method
The corresponding transformed coordinate point of punctuate；Calculate between the longitude and latitude of each transformed coordinate point and the longitude and latitude of coordinate points A (0,0)
Distance, it is determined that distance most short corresponding conversion coordinate points be transformed coordinate point B '.
As shown in Fig. 2 in the range of with dotted line circle, calculating the corresponding transformed coordinate point of each coordinate points, and calculating and coordinate
(0, the distance between longitude and latitude 0) determines apart from S point A, and S minimum corresponding conversion coordinate points are transformed coordinate point B '.
For the comparison between the S of each coordinate points, the absolute value sum between coordinates computed point, Ran Houjin can be adopted
The mode that row is compared to each other.
The scheme of above-described embodiment, the transformed coordinate point B ' minimum by asking for distance can reduce the two of mutual conversion
Range of error between individual coordinate system, improves degree of accuracy.
In another embodiment, the step of carrying out translation operation for step S103, specifically can be as follows：
1) set control variable m, n of cycle calculations；Wherein, m is step value, n=1,2,3 ....
2) think mirror image coordinate points B (xB,yB) centered on point add control variable carry out computing, obtain coordinate point set F
[(xB+m*n,yB)、(xB-m*n,yB)、(xB,yB-m*n)、(xB,yB+m*n)]；With reference to shown in Fig. 3, Fig. 3 shows for coordinate point set F
It is intended to.
3) calculate the conversion coordinate of 4n coordinate points in coordinate point set F using the coordinates transformation method respectively
Point set BF’[B1,B2……B4n]。
4) calculate transformed coordinate point set BF' each point and coordinate points A distance set SF[S1,S2……S4n], it is determined that distance
In set S, the corresponding transformed coordinate point of minimum range is transformed coordinate point B '.
Generally, m=0.00001, during n=5, the deviation and best results of structure, error can be controlled at 4 meters
Within, for the determination of m, n value, S values minimum can be tried to achieve by modification repeatedly and operation time determines in short-term.
The scheme of above-described embodiment, asks for the minimum transformed coordinate point B ' of distance by recursive principle, obtain deviation with
Best results, can substantially reduce range of error between two coordinate systems of mutual conversion, improve degree of accuracy.
Step S104, carries out turning for map coordinates system according to longitude and latitude corresponding relation of coordinate points A with transformed coordinate point B '
Change.
In this step, by corresponding relation between the longitude and latitude of coordinate points A and transformed coordinate point B ', it is possible to achieve arbitrarily
The longitude and latitude of two map coordinates systems is freely changed.
In one embodiment, for the step of step S104 carries out coordinate system to be changed, specifically can be as follows：
According to coordinate points A and the longitude and latitude corresponding relation of transformed coordinate point B ', determine current map coordinate system with target ground
The longitude and latitude transformational relation changed between figure coordinate system；According to the longitude and latitude transformational relation by reconnaissance in current map coordinate system
Longitude and latitude be converted to the longitude and latitude of reconnaissance in target map coordinate system.
The scheme of above-described embodiment, coordinate points A determined by abovementioned steps are corresponding with the longitude and latitude of transformed coordinate point B '
Relation, and then the relation between current map coordinate system and target map coordinate system is obtained, just will can work as in actual applications
On front map coordinates system, the longitude and latitude of any reconnaissance is converted to the longitude and latitude of correspondence reconnaissance in target map coordinate system.
Summary technical scheme, the longitude and latitude realized between multiple geographic coordinate systems are mutually freely changed, and are coordinate
It is that AES provides effective and feasible method for correcting error, can be to different maps difference SDK (Software Development
Kit, SDK) between longitude and latitude be modified, correct the error that causes on map of coordinate system AES,
Effectively improve the degree of accuracy and work efficiency of cartographic information collection.
Such as hundred degree of coordinate systems of above-mentioned BD-09, hundred degree of BD-09 is tied to by the WGS-84 coordinates that Baidu map supplier provides
Coordinate system AES, you can realize that hundred degree of coordinates of BD-09 are tied to the longitude and latitude conversion of WGS-84 coordinate systems.
With reference to shown in Fig. 4, conversion system structure schematic diagrams of the Fig. 4 for the map coordinates system of one embodiment, including：Coordinate
Click delivery block 101, the first modular converter 102, the second modular converter 103 and longitude and latitude modular converter 104.
For coordinate points choose module 101, for taking coordinate points A from the body of a map or chart of current map coordinate system, by which
It is set to the origin of two-dimensional coordinate system.
For the first modular converter 102, coordinate is obtained for carrying out translation operation to coordinate points A using coordinates transformation method
Point A ', and coordinate points Y are obtained with regard to mirror image coordinate points B on y=-x axis of symmetry；Wherein, the longitudinal axis of the y for two-dimensional coordinate system, x is
The transverse axis of two-dimensional coordinate system.
For the second modular converter 103, for being changed according to the coordinates transformation method and mirror image coordinate points B
The transformed coordinate point B ' that computing is obtained.
In one embodiment, second modular converter 103, is further used for centered on mirror image coordinate points B
In set point, the corresponding transformed coordinate point of each coordinate points is calculated respectively using the coordinates transformation method；Calculate each turn
The distance between the longitude and latitude of coordinate points and described longitude and latitude are changed, it is determined that the most short corresponding conversion coordinate points of distance are sat for conversion
Punctuate B '.
In another embodiment, second modular converter 103 is further used for：
1) set control variable m, n of cycle calculations；Wherein, m is step value, n=1,2,3 ...；
2) think mirror image coordinate points B (xB,yB) centered on point add control variable carry out computing, obtain coordinate point set F
[(xB+m*n,yB)、(xB-m*n,yB)、(xB,yB-m*n)、(xB,yB+m*n)]；
3) calculate the conversion coordinate of 4n coordinate points in coordinate point set F using the coordinates transformation method respectively
Point set BF’[B1,B2……B4n]；
4) calculate transformed coordinate point set BF' each point and coordinate points A distance set SF[S1,S2……S4n]；It is determined that distance
In set S, the corresponding transformed coordinate point of minimum range is transformed coordinate point B '.
For longitude and latitude modular converter 104, enter for the longitude and latitude corresponding relation according to coordinate points A with transformed coordinate point B '
The conversion of row map coordinates system.
In one embodiment, the longitude and latitude modular converter 104, is further used for according to coordinate points A and conversion coordinate
The longitude and latitude corresponding relation of point B ', determines that the longitude and latitude conversion changed between current map coordinate system and target map coordinate system is closed
System；The longitude and latitude of reconnaissance in current map coordinate system is converted in target map coordinate system according to the longitude and latitude transformational relation
The longitude and latitude of reconnaissance.
In above-mentioned each embodiment, the map coordinates system can include WGS-84 coordinate systems, hundred degree of coordinates of BD-09
System, GCJ-02 Mars coordinate systems, search dog coordinate system etc..
The converting system of the map coordinates system of the present invention is corresponded with the conversion method of the map coordinates system of the present invention,
The technical characteristic and its advantage that the embodiment of the conversion method of above-mentioned map coordinates system is illustrated is applied to map coordinates system
Converting system embodiment in, hereby give notice that.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but and
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (8)
1. a kind of conversion method of map coordinates system, it is characterised in that comprise the steps：
Coordinate points A are taken from the body of a map or chart of current map coordinate system, the origin of two-dimensional coordinate system is set to；
Translation operation is carried out to coordinate points A using coordinates transformation method and obtains coordinate points A ', and obtain coordinate points A ' with regard to y=-x
Mirror image coordinate points B on axis of symmetry；Wherein, the longitudinal axis of the y for two-dimensional coordinate system, transverse axis of the x for two-dimensional coordinate system；
The transformed coordinate point B ' that translation operation is obtained is carried out according to the coordinates transformation method and mirror image coordinate points B；Specifically
Including：Assumed coordinate point B is a bit in coordinate system to be converted, recycles same coordinates transformation method, to what is above obtained
Mirror image coordinate points B carry out translation operation, obtain the transformed coordinate point B ' of coordinate system to be converted；
The conversion of map coordinates system is carried out according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '；Specifically include：Root
According to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', determine current map coordinate system and target map coordinate system it
Between the longitude and latitude transformational relation changed；The longitude and latitude of reconnaissance in current map coordinate system is turned according to the longitude and latitude transformational relation
It is changed to the longitude and latitude of reconnaissance in target map coordinate system.
2. the conversion method of map coordinates system according to claim 1, it is characterised in that described according to the Coordinate Conversion
The step of algorithm and mirror image coordinate points B carry out the transformed coordinate point B ' that translation operation is obtained, including：
In the set point centered on mirror image coordinate points B, each coordinate points is calculated respectively using the coordinates transformation method
Corresponding transformed coordinate point；
The distance between the longitude and latitude of each transformed coordinate point and longitude and latitude of coordinate points A are calculated, it is determined that distance is most short
Corresponding conversion coordinate points are transformed coordinate point B '.
3. the conversion method of map coordinates system according to claim 1, it is characterised in that described according to the Coordinate Conversion
The step of algorithm and mirror image coordinate points B carry out the transformed coordinate point B ' that translation operation is obtained, including：
Control variable m, n of setting cycle calculations；Wherein, m is step value, n=1,2,3 ...；
Think mirror image coordinate points B (xB,yB) centered on point add control variable carry out computing, obtain coordinate point set F [(xB+m*
n,yB)、(xB-m*n,yB)、(xB,yB-m*n)、(xB,yB+m*n)]；
The transformed coordinate point set of 4n coordinate points in the coordinate point range F is calculated respectively using the coordinates transformation method
BF’[B1,B2……B4n]；
Calculate transformed coordinate point set BF' each point and coordinate points A distance set SF[S1,S2……S4n], determine distance set S
The corresponding transformed coordinate point of middle minimum range is transformed coordinate point B '.
4. the conversion method of the map coordinates system according to any one of claims 1 to 3, it is characterised in that the map is sat
Mark system includes WGS-84 coordinate systems, hundred degree of coordinate systems of BD-09, GCJ-02 Mars coordinate systems, search dog coordinate system.
5. a kind of converting system of map coordinates system, it is characterised in that include：
Coordinate points choose module, for taking coordinate points A from the body of a map or chart of current map coordinate system, are set to two-dimensional coordinate
The origin of system；
First modular converter, obtains coordinate points A for carrying out translation operation to coordinate points A using coordinates transformation method ', and obtain
Coordinate points Y are with regard to mirror image coordinate points B on y=-x axis of symmetry；Wherein, the longitudinal axis of the y for two-dimensional coordinate system, x is two-dimensional coordinate system
Transverse axis；
Second modular converter, for carrying out what translation operation was obtained according to the coordinates transformation method and mirror image coordinate points B
Transformed coordinate point B '；Specifically include：Assumed coordinate point B is a bit in coordinate system to be converted, recycles same Coordinate Conversion
Algorithm, mirror image coordinate points B to above obtaining carry out translation operation, obtain the transformed coordinate point B ' of coordinate system to be converted；
Longitude and latitude modular converter, carries out map reference for the longitude and latitude corresponding relation according to coordinate points A with transformed coordinate point B '
The conversion of system；Specifically include：According to coordinate points A and the longitude and latitude corresponding relation of transformed coordinate point B ', current map coordinate is determined
The longitude and latitude transformational relation changed between system and target map coordinate system；Current map is sat according to the longitude and latitude transformational relation
Mark fastens the longitude and latitude that the longitude and latitude of reconnaissance is converted to reconnaissance in target map coordinate system.
6. the converting system of map coordinates system according to claim 5, it is characterised in that second modular converter, enters
One step calculates each seat using the coordinates transformation method respectively in the set point centered on mirror image coordinate points B
The corresponding transformed coordinate point of punctuate；The distance between the longitude and latitude of each transformed coordinate point and described longitude and latitude are calculated, it is determined that
The most short corresponding conversion coordinate points of distance are transformed coordinate point B '.
7. the converting system of map coordinates system according to claim 5, it is characterised in that second modular converter, enters
One step is used for：
Control variable m, n of setting cycle calculations；Wherein, m is step value, n=1,2,3 ...；
Think mirror image coordinate points B (xB,yB) centered on point add control variable carry out computing, obtain coordinate point set F [(xB+m*
n,yB)、(xB-m*n,yB)、(xB,yB-m*n)、(xB,yB+m*n)]；
The transformed coordinate point set of 4n coordinate points in coordinate point set F is calculated respectively using the coordinates transformation method
BF’[B1,B2……B4n]；
Calculate transformed coordinate point set BF' each point and coordinate points A distance set SF[S1,S2……S4n], determine distance set S
The corresponding transformed coordinate point of middle minimum range is transformed coordinate point B '.
8. the converting system of the map coordinates system according to any one of claim 5 to 7, it is characterised in that the map is sat
Mark system includes WGS-84 coordinate systems, hundred degree of coordinate systems of BD-09, GCJ-02 Mars coordinate systems, search dog coordinate system.
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| CN109408041A (en) * | 2018-10-09 | 2019-03-01 | 深圳点猫科技有限公司 | A kind of the map coordinates system conversion method and electronic equipment of language based on programming |
| CN109559377B (en) * | 2018-11-19 | 2022-11-18 | 成都智库二八六一信息技术有限公司 | Method for generating three-dimensional map model by utilizing longitude and latitude polygon cutting |
| CN111723167B (en) * | 2019-05-10 | 2023-03-24 | 腾讯科技（深圳）有限公司 | Map coordinate conversion method, map coordinate conversion device, readable storage medium and computer equipment |
| CN112146645B (en) * | 2019-06-28 | 2022-07-22 | 浙江商汤科技开发有限公司 | Method and device for aligning coordinate system, electronic equipment and storage medium |
| CN112037307A (en) * | 2020-09-15 | 2020-12-04 | 恒瑞通（福建）信息技术有限公司 | Method and terminal for drawing and positioning map picture |
| CN113064187A (en) * | 2021-04-07 | 2021-07-02 | 多彩贵州印象网络传媒股份有限公司 | Original GPS data-based longitude and latitude deviation rectifying capability algorithm |
| CN113691937B (en) * | 2021-08-25 | 2022-12-06 | 北京百度网讯科技有限公司 | Method for determining position information, cloud mobile phone and terminal equipment |
| CN117494248B (en) * | 2023-12-29 | 2024-04-12 | 中科图新(苏州)科技有限公司 | Coordinate data processing method, device, computer equipment and storage medium |
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| CN1595067A (en) * | 2004-06-23 | 2005-03-16 | 武汉虹信通信技术有限责任公司 | Method for rapid transformation of geographical coordinate projection in navigational system |
| CN101586963A (en) * | 2009-07-03 | 2009-11-25 | 光庭导航数据（武汉）有限公司 | Map coordinates transformation method based on shape fidelity |
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| KR100634010B1 (en) * | 2004-01-20 | 2006-10-13 | 엘지전자 주식회사 | Method for changing coordinates value of digital map |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1595067A (en) * | 2004-06-23 | 2005-03-16 | 武汉虹信通信技术有限责任公司 | Method for rapid transformation of geographical coordinate projection in navigational system |
| CN101586963A (en) * | 2009-07-03 | 2009-11-25 | 光庭导航数据（武汉）有限公司 | Map coordinates transformation method based on shape fidelity |
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