CN104048659A - Method and system for transforming map coordinate system - Google Patents
Method and system for transforming map coordinate system Download PDFInfo
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- CN104048659A CN104048659A CN201410267525.1A CN201410267525A CN104048659A CN 104048659 A CN104048659 A CN 104048659A CN 201410267525 A CN201410267525 A CN 201410267525A CN 104048659 A CN104048659 A CN 104048659A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/20—Instruments for performing navigational calculations
Abstract
The invention provides a method and a system for transforming a map coordinate system. The method comprises the following steps: taking a coordinate point A in a map range of the current map coordinate system, and setting the coordinate point A as an original point of a two-dimensional coordinate system; transforming the coordinate point A to obtain a coordinate point A' by utilizing a coordinate transformation algorithm, and solving a mirror-image coordinate point B of the coordinate point A' about a symmetric axis of y=-x, wherein y is a longitudinal axis of the two-dimensional coordinate system, and x is a transverse axis of the two-dimensional coordinate system; transforming the mirror-image coordinate point B to obtain a transformed coordinate point B' according to the coordinate transformation algorithm; transforming the map coordinate system according to a longitude and latitude corresponding relation of the coordinate point A and the transformed coordinate point B'. By adopting the method and the system, the longitude and latitude among different geological coordinate systems can be mutually transformed freely, an effective and feasible corrective method can be provided for the coordinate encryption algorithm, the longitude and the latitude among different SDK (software development kit) of different maps can be corrected, and the precision and working efficiency for collecting the map information can be improved.
Description
Technical field
The present invention relates to GIS applied technical field, particularly relate to a kind of conversion method and system of map coordinates system.
Background technology
In existing map positioning function, Global Positioning System (GPS)) and AGPS (Assisted Global Positioning System: auxiliary global satellite positioning system) position, this locator meams is likely subject to blocking of building or the not good problem that causes deviations even cannot locate greatly of network condition by utilizing GPS (Global Positioning System:.The error problem causing on map in order to solve coordinate system, often needs correction database of extra importing to rectify a deviation to the position of base station, recalculates the coordinate of map.
In the map coordinates system using at present, mainly comprise WGS-84 (World Geodetic System mono-1984Coordinate System) coordinate system, GCJ-02 Mars coordinate system (coordinate system of the Geographic Information System of being worked out by China's National Bureau of Surveying and Mapping), the map BD-09 of Baidu coordinate system, search dog coordinate system etc.These coordinate systems in use, need to carry out the conversion of coordinate system.For example, just require at home at least to use GCJ-02 coordinate-system, other coordinate system is all by GCJ-02 coordinate system, to enter migration algorithm to obtain.Map supply business is generally only to provide and by other coordinate systems, is transformed into the coordinate system cryptographic algorithm of self, be called for short coordinates transformation method, nonstandardized technique due to data, the limitation that can not arbitrarily change by coordinate system, between coordinate system, cannot accomplish freely changing of longitude and latitude, the data that obtain in drive test can not be widely used in the GIS application of other coordinate systems simultaneously, and these have all had a strong impact on degree of accuracy and work efficiency that cartographic information gathers.
Summary of the invention
Based on this, be necessary for above-mentioned technical matters, a kind of conversion method and system of map coordinates system is provided, can realize freely changing between different coordinates longitude and latitude.
A conversion method for map coordinates system, comprises the steps:
In the body of a map or chart of current map coordinates system, get coordinate points A, be made as the initial point of two-dimensional coordinate system;
Utilize coordinates transformation method to carry out translation operation to coordinate points A and obtain coordinate points A ', and obtain coordinate points A ' about the mirror image coordinate points B on y=-x axis of symmetry; Wherein, the longitudinal axis that y is two-dimensional coordinate system, the transverse axis that x is two-dimensional coordinate system;
According to described coordinates transformation method and described mirror image coordinate points B, carry out the transformed coordinate point B ' that translation operation obtains;
According to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', carry out the conversion of map coordinates system.
Coordinate points is chosen module, for getting coordinate points A in the body of a map or chart from current map coordinates system, is made as the initial point of two-dimensional coordinate system;
The first modular converter, obtains coordinate points A ' for utilizing coordinates transformation method to carry out translation operation to coordinate points A, and obtains coordinate points A ' about the mirror image coordinate points B on y=-x axis of symmetry; Wherein, the longitudinal axis that y is two-dimensional coordinate system, the transverse axis that x is two-dimensional coordinate system;
The second modular converter, for carrying out according to described coordinates transformation method and described mirror image coordinate points B the transformed coordinate point B ' that translation operation obtains;
Longitude and latitude modular converter, for carrying out the conversion of map coordinates system according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '.
The conversion method of above-mentioned map coordinates system and system, utilize coordinates transformation method to carry out translation operation to the coordinate points A choosing from current map coordinates system and obtain coordinate points A ', and obtain coordinate points A ' about the mirror image coordinate points B on y=-x axis of symmetry, the transformed coordinate point B ' obtaining by translation operation again, and then carry out the conversion of map coordinates system by the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '.The longitude and latitude of having realized between a plurality of geographic coordinate systems is freely changed mutually, for coordinate system cryptographic algorithm provides effective and feasible method for correcting error, can revise the longitude and latitude between the different SDK of different maps, improve degree of accuracy and work efficiency that cartographic information gathers.
Accompanying drawing explanation
Fig. 1 is the conversion method process flow diagram of the map coordinates system of an embodiment;
Fig. 2 is coordinate points conversion schematic diagram in the transfer process of map coordinates system;
Fig. 3 is coordinate points set F schematic diagram;
Fig. 4 is the converting system structural representation of the map coordinates system of an embodiment.
Embodiment
The present invention proposes a kind of conversion method and system of map coordinates system, be mainly the coordinate conversion realizing between map coordinates system, between a plurality of coordinate systems such as the WGS-84 coordinate system using such as GPS global positioning satellite, BD-09 hundred degree coordinate systems, GCJ-02 Mars coordinate system, search dog coordinate system, the mutual of longitude and latitude freely changed.The error that coordinate system cryptographic algorithm causes on map be can revise, degree of accuracy and work efficiency that cartographic information gathers effectively improved.
Below in conjunction with accompanying drawing, the embodiment of the conversion method of map coordinates system of the present invention and system is described in detail.
Described in figure 1, Fig. 1 is the conversion method process flow diagram of the map coordinates system of an embodiment, comprises the steps:
Step S101 gets coordinate points A in the body of a map or chart of current map coordinates system, is made as the initial point of two-dimensional coordinate system.
In this step, in can the effective range by the map that provides map supply business, choose a coordinate points, be made as the initial point of the two-dimensional coordinate system of setting, with BD-09 hundred degree coordinate systems and general WGS-84 coordinate, it is example, with current map reference, be BD-09 hundred degree coordinate systems, WGS-84 coordinate is coordinate system to be converted, and the map supply business of Baidu provides the coordinates transformation method that is converted to BD-09 hundred degree coordinate systems by WGS-84 coordinate system.Shown in figure 2, coordinate points conversion schematic diagram in the transfer process that Fig. 2 is map coordinates system, the coordinate points of coordinate points A for choosing in the body of a map or chart of current map coordinates system, shown in two-dimensional coordinate system in, coordinate points A (0,0) is initial point.
Step S102, utilizes coordinates transformation method to carry out translation operation to coordinate points A and obtains coordinate points A ', and obtains coordinate points A ' about the mirror image coordinate points B on y=-x axis of symmetry; Wherein, the longitudinal axis that y is two-dimensional coordinate system, the transverse axis that x is two-dimensional coordinate system.
In this step, be that supposition coordinate points A is a bit on coordinate system to be converted, obtain coordinate points A ' about the mirror image coordinate points B on y=-x axis of symmetry, as shown in Figure 2, false coordinate point A ' is at the first quartile of two-dimensional coordinate system, and mirror image coordinate points B is at the third quadrant of two-dimensional coordinate system.WGS-84 coordinate system described above, the coordinates transformation method coordinates computed point A ' to current map that utilizes map supply business to provide, as above-mentioned WGS-84 coordinate system is converted to the coordinate system transfer algorithm that BD-09 hundred spends coordinate systems, the coordinate points A that supposes BD-09 hundred degree coordinate systems is a bit on WGS-84 coordinate system, at two-dimensional coordinate, fasten and obtain coordinate points A ' about the mirror image coordinate points B on y=-x axis of symmetry again, as figure.
Step S103, carries out according to described coordinates transformation method and described mirror image coordinate points B the transformed coordinate point B ' that translation operation obtains.
In this step, that supposition coordinate points B is a bit on coordinate system to be converted, recycle same coordinates transformation method, the mirror image coordinate points B obtaining is above carried out to translation operation, obtain the transformed coordinate point B ' of coordinate system to be converted, as shown in Figure 2, after coordinates transformation method calculates again, transformed coordinate point B ' can drop near coordinate points A (0,0), and transformed coordinate point B ' is the coordinate points after correction.As above-mentioned WGS-84 coordinate system, utilize WGS-84 coordinate system to be converted to the coordinates transformation method of BD-09 hundred degree coordinate systems, again coordinate points B is carried out to the transformed coordinate point B ' that translation operation obtains, transformed coordinate point B ' is coordinate points A corresponding coordinate points on WGS-84 coordinate system after correction of BD-09 hundred degree coordinate systems.
In one embodiment, for step S103, carry out the step of translation operation, specifically can be as follows:
In the setting range centered by mirror image coordinate points B, utilize described coordinates transformation method to calculate respectively transformed coordinate point corresponding to each coordinate points; Calculate the distance between the longitude and latitude of each transformed coordinate point and the longitude and latitude of described coordinate points A (0,0), determine that the shortest corresponding conversion coordinate points of distance is transformed coordinate point B '.
As shown in Figure 2, within the scope of dotted line circle, calculate transformed coordinate point corresponding to each coordinate points, and the distance between calculating and the longitude and latitude of coordinate points A (0,0) is definite apart from S, the corresponding conversion coordinate points of S minimum is transformed coordinate point B '.
For the comparison between the S of each coordinate points, can adopt the absolute value sum between coordinates computed point, then carry out the mode mutually comparing.
The scheme of above-described embodiment, by asking for the minimum transformed coordinate point B ' of distance, can reduce error range between two coordinate systems of mutual conversion, improves degree of accuracy.
In another embodiment, for step S103, carry out the step of translation operation, specifically can be as follows:
1) set control variable m, the n of cycle calculations; Wherein, m is step value, n=1,2,3 ...
2) think mirror image coordinate points B (x
b, y
b) centered by put access control variable and carry out computing, obtain coordinate points set F[(x
b+ m*n, y
b), (x
b-m*n, y
b), (x
b, y
b-m*n), (x
b,
yB+ m*n)]; Shown in figure 3, Fig. 3 is coordinate points set F schematic diagram.
3) utilize described coordinates transformation method to calculate respectively the transformed coordinate point set B of 4n coordinate points in described coordinate points set F
f' [B
1, B
2b
4n].
4) calculate transformed coordinate point set B
f' the distance set S of each point and coordinate points A
f[S
1, S
2s
4n], determine that in distance set S, transformed coordinate point corresponding to minor increment is transformed coordinate point B '.
Generally, m=0.00001, during n=5, the deviate of structure and best results, error can be controlled in 4 meters, for determining of m, n value, can by modification repeatedly try to achieve S value minimum and operation time definite in short-term.
The scheme of above-described embodiment, asks for the minimum transformed coordinate point B ' of distance by recursive principle, obtains deviate and best results, can obviously reduce error range between two coordinate systems of mutual conversion, improves degree of accuracy.
Step S104, carries out the conversion of map coordinates system according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '.
In this step, by corresponding relation between coordinate points A and the longitude and latitude of transformed coordinate point B ', can realize freely the changing of longitude and latitude of any two map coordinates systems.
In one embodiment, for step S104, carry out the step of coordinate system conversion, specifically can be as follows:
According to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', determine the longitude and latitude transformational relation of changing between current map coordinates system and target map coordinate system; The longitude and latitude of current map reference being fastened to reconnaissance according to described longitude and latitude transformational relation is converted to the longitude and latitude of reconnaissance on target map coordinate system.
The scheme of above-described embodiment, by the longitude and latitude corresponding relation of the definite coordinate points A of abovementioned steps and transformed coordinate point B ', and then obtain the relation between current map coordinates system and target map coordinate system, just the longitude and latitude of any reconnaissance on current map coordinates system can be converted to the longitude and latitude of corresponding reconnaissance on target map coordinate system in actual applications.
Comprehensive technique scheme, the longitude and latitude of having realized between a plurality of geographic coordinate systems is freely changed mutually, for coordinate system cryptographic algorithm provides effective and feasible method for correcting error, can be to different SDK (the Software Development Kit of different maps, SDK (Software Development Kit)) longitude and latitude between is revised, revise the error that coordinate system cryptographic algorithm causes on map, effectively improve degree of accuracy and work efficiency that cartographic information gathers.
As above-mentioned BD-09 hundred degree coordinate systems, the WGS-84 coordinate providing by the map supply business of Baidu is tied to BD-09 hundred degree coordinate system cryptographic algorithm, can realize the longitude and latitude conversion that BD-09 hundred degree coordinates are tied to WGS-84 coordinate system.
Shown in figure 4, Fig. 4 is the converting system structural representation of the map coordinates system of an embodiment, comprising: coordinate points is chosen module 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 getting coordinate points A in the body of a map or chart from current map coordinates system, be made as the initial point of two-dimensional coordinate system.
For the first modular converter 102, for utilizing coordinates transformation method to carry out translation operation to coordinate points A, obtain coordinate points A ', and obtain coordinate points Y about the mirror image coordinate points B on y=-x axis of symmetry; Wherein, the longitudinal axis that y is two-dimensional coordinate system, the transverse axis that x is two-dimensional coordinate system.
For the second modular converter 103, for carrying out according to described coordinates transformation method and described mirror image coordinate points B the transformed coordinate point B ' that translation operation obtains.
In one embodiment, described the second modular converter 103, is further used in the setting range centered by mirror image coordinate points B, utilizes described coordinates transformation method to calculate respectively transformed coordinate point corresponding to each coordinate points; Calculate the longitude and latitude of each transformed coordinate point and the distance between described longitude and latitude, determine that the shortest corresponding conversion coordinate points of distance is transformed coordinate point B '.
In another embodiment, described the second modular converter 103 is further used for:
1) set control variable m, the n of cycle calculations; Wherein, m is step value, n=1,2,3
2) think mirror image coordinate points B (x
b, y
b) centered by put access control variable and carry out computing, obtain coordinate points set F[(x
b+ m*n, y
b), (x
b-m*n, y
b), (x
b, y
b-m*n), (x
b, y
b+ m*n)];
3) utilize described coordinates transformation method to calculate respectively the transformed coordinate point set B of 4n coordinate points in described coordinate points set F
f' [B
1, B
2b
4n];
4) calculate transformed coordinate point set B
f' the distance set S of each point and coordinate points A
f[S
1, S
2s
4n]; Determine that in distance set S, transformed coordinate point corresponding to minor increment is transformed coordinate point B '.
For longitude and latitude modular converter 104, for carrying out the conversion of map coordinates system according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '.
In one embodiment, described longitude and latitude modular converter 104, is further used for, according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', determining the longitude and latitude transformational relation of changing between current map coordinates system and target map coordinate system; The longitude and latitude of current map reference being fastened to reconnaissance according to described longitude and latitude transformational relation is converted to the longitude and latitude of reconnaissance on target map coordinate system.
In above-mentioned each embodiment, described map coordinates system can comprise WGS-84 coordinate system, BD-09 hundred degree coordinate systems, GCJ-02 Mars coordinate system, search dog coordinate system etc.
The converting system of map coordinates system of the present invention is corresponding one by one with the conversion method of map coordinates system of the present invention, in the embodiment of the converting system that the technical characterictic of setting forth at the embodiment of the conversion method of above-mentioned map coordinates system and beneficial effect thereof are all applicable to map coordinates system, statement hereby.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a conversion method for map coordinates system, is characterized in that, comprises the steps:
In the body of a map or chart of current map coordinates system, get coordinate points A, be made as the initial point of two-dimensional coordinate system;
Utilize coordinates transformation method to carry out translation operation to coordinate points A and obtain coordinate points A ', and obtain coordinate points A ' about the mirror image coordinate points B on y=-x axis of symmetry; Wherein, the longitudinal axis that y is two-dimensional coordinate system, the transverse axis that x is two-dimensional coordinate system;
According to described coordinates transformation method and described mirror image coordinate points B, carry out the transformed coordinate point B ' that translation operation obtains;
According to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', carry out the conversion of map coordinates system.
2. the conversion method of map coordinates system according to claim 1, is characterized in that, described step of carrying out the transformed coordinate point B ' that translation operation obtains according to described coordinates transformation method and described mirror image coordinate points B, comprising:
In the setting range centered by mirror image coordinate points B, utilize described coordinates transformation method to calculate respectively transformed coordinate point corresponding to each coordinate points;
Calculate the distance between the longitude and latitude of each transformed coordinate point and the longitude and latitude of described coordinate points A, determine that the shortest corresponding conversion coordinate points of distance is transformed coordinate point B '.
3. the conversion method of map coordinates system according to claim 1, is characterized in that, described step of carrying out the transformed coordinate point B ' that translation operation obtains according to described coordinates transformation method and described mirror image coordinate points B, comprising:
Set control variable m, the n of cycle calculations; Wherein, m is step value, n=1,2,3
Think mirror image coordinate points B (x
b, y
b) centered by put access control variable and carry out computing, obtain coordinate points set F[(x
b+ m*n, y
b), (x
b-m*n, y
b), (x
b, y
b-m*n), (x
b, y
b+ m*n)];
Utilize described coordinates transformation method to calculate respectively the transformed coordinate point set B of 4n coordinate points in described coordinate points scope F
f' [B
1, B
2b
4n];
Calculate transformed coordinate point set B
f' the distance set S of each point and coordinate points A
f[S
1, S
2s
4n], determine that in distance set S, transformed coordinate point corresponding to minor increment is transformed coordinate point B '.
4. the conversion method of map coordinates system according to claim 1, is characterized in that, the step of carrying out the conversion of map coordinates system according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', comprising:
According to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', determine the longitude and latitude transformational relation of changing between current map coordinates system and target map coordinate system; The longitude and latitude of current map reference being fastened to reconnaissance according to described longitude and latitude transformational relation is converted to the longitude and latitude of reconnaissance on target map coordinate system.
5. according to the conversion method of the map coordinates system described in claim 1 to 4 any one, it is characterized in that, described map coordinates system comprises WGS-84 coordinate system, BD-09 hundred degree coordinate systems, GCJ-02 Mars coordinate system, search dog coordinate system.
6. a converting system for map coordinates system, is characterized in that, comprising:
Coordinate points is chosen module, for getting coordinate points A in the body of a map or chart from current map coordinates system, is made as the initial point of two-dimensional coordinate system;
The first modular converter, obtains coordinate points A ' for utilizing coordinates transformation method to carry out translation operation to coordinate points A, and obtains coordinate points Y about the mirror image coordinate points B on y=-x axis of symmetry; Wherein, the longitudinal axis that y is two-dimensional coordinate system, the transverse axis that x is two-dimensional coordinate system;
The second modular converter, for carrying out according to described coordinates transformation method and described mirror image coordinate points B the transformed coordinate point B ' that translation operation obtains;
Longitude and latitude modular converter, for carrying out the conversion of map coordinates system according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B '.
7. the converting system of map coordinates system according to claim 6, it is characterized in that, described the second modular converter, is further used in the setting range centered by mirror image coordinate points B, utilizes described coordinates transformation method to calculate respectively transformed coordinate point corresponding to each coordinate points; Calculate the longitude and latitude of each transformed coordinate point and the distance between described longitude and latitude, determine that the shortest corresponding conversion coordinate points of distance is transformed coordinate point B '.
8. the converting system of map coordinates system according to claim 6, is characterized in that, described the second modular converter, is further used for:
Set control variable m, the n of cycle calculations; Wherein, m is step value, n=1,2,3
Think mirror image coordinate points B (x
b, y
b) centered by put access control variable and carry out computing, obtain coordinate points set F[(x
b+ m*n, y
b), (x
b-m*n, y
b), (x
b, y
b-m*n), (x
b, y
b+ m*n)];
Utilize described coordinates transformation method to calculate respectively the transformed coordinate point set B of 4n coordinate points in described coordinate points set F
f' [B
1, B
2b
4n];
Calculate transformed coordinate point set B
f' the distance set S of each point and coordinate points A
f[S
1, S
2s
4n], determine that in distance set S, transformed coordinate point corresponding to minor increment is transformed coordinate point B '.
9. the converting system of map coordinates system according to claim 6, it is characterized in that, longitude and latitude modular converter, be further used for, according to the longitude and latitude corresponding relation of coordinate points A and transformed coordinate point B ', determining the longitude and latitude transformational relation of changing between current map coordinates system and target map coordinate system; The longitude and latitude of current map reference being fastened to reconnaissance according to described longitude and latitude transformational relation is converted to the longitude and latitude of reconnaissance on target map coordinate system.
10. according to the converting system of the map coordinates system described in claim 6 to 9 any one, it is characterized in that, described map coordinates system comprises WGS-84 coordinate system, BD-09 hundred degree coordinate systems, GCJ-02 Mars coordinate system, search dog coordinate system.
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