CN109947877A - A kind of method and system improving GIS mobile terminal Orientation on map precision - Google Patents
A kind of method and system improving GIS mobile terminal Orientation on map precision Download PDFInfo
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Abstract
The present invention relates to a kind of method and system for improving GIS mobile terminal Orientation on map precision, on the one hand by in project map combining geographical coverage area, area grid division is carried out by certain partition method, different area grids uses seven different parameters, and decrease independently solves the influence of error brought by non-seven parameter of concerning security matters；On the other hand after through seven-parameter transformation, carrying out the secondary correction of coordinate can make mobile device within the scope of target area by the collective effect of two steps, and coordinate conversion reaches higher precision.The present invention is under the premise of independent of high-grade confidential data, improve the conversion accuracy that GPS coordinate is converted to national Xi'an 80, Beijing 54 and Local Independent Coordinate System using non-seven parameter of concerning security matters, usual transformed error is higher than 30 meters, the present invention can be by control errors within 2 meters, and it is linear to have error.
Description
Technical field
The present invention relates to geodesic survey, numerical map and technical field of geographic information, and in particular to a kind of raising GIS is mobile
The method and system of terminal device positioning accuracy in map.
Background technique
The information system based on GIS technology plays more and more big work in terms of Land Resources Management at present
With especially the equipment such as smart phone, tablet computer to be based on numerical map coordinate frame, GPS real-time positioning information
The mobile terminal system of core defends the business scopes such as piece law enforcement, Land Change Survey in country and has played efficient, visualization office
Effect.
But due to national basis geodata coordinate system, system map is generally required using Xi'an 80, Beijing
54 equal referenced-centric systems systems, this relates to GPS positioning coordinate to the transfer problem of non-WGS84 map coordinates system.From known skill
Art is apparent from, and Boersa model seven-parameter transformation method is generally used, since seven parameters are " Surveying Management Work state secret ranges
Regulation " specified in concerning security matters grade be top-secret surveying and mapping result, it is difficult to obtain, it is common practice to pass through some known points
To calculating seven parameters.And be typically due to geodetic height coordinate components of the point in Xi'an 80 or BJ54 Coordinate System and be difficult to obtain,
Or the reasons such as measurement cost height, concerning security matters grade height, cause seven parameters to calculate inaccurate due to a lack of this coordinate components, thus cause
Coordinate conversion error, error bring limitation up to 50 meters or more, to application.
Summary of the invention
The present invention for the technical problems in the prior art, provides a kind of raising GIS mobile terminal Orientation on map essence
The method and system of degree, independent of seven parameter of concerning security matters, for solving GIS mobile application especially territory information
Change in industrial application, equipment acquisition GPS coordinate be converted into national Xi'an 80, Beijing 54, independent local coordinate system map reference,
And its conversion accuracy is improved, to realize the precise marking current location on such map.
The technical scheme to solve the above technical problems is that
On the one hand, the present invention provides a kind of method for improving GIS mobile terminal Orientation on map precision, comprising the following steps:
According to basic geological study data, target area is divided into multiple subregion grid A1~An, each sub-district is sought respectively
Conversion seven parameter of the WGS84 coordinate system coordinate of domain grid to target map coordinate system coordinate；
For subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim, utilize turning for each sub-regions grid
It changes seven parameters and seeks mean error increment between WGS84 coordinate system and target map coordinate system；
By mobile device obtain GPS coordinate C respectively with each sub-regions grid A1~AnSpatial overlay analysis is carried out, is sentenced
Break the affiliated subregion of GPS coordinate C, utilizes seven parameter of conversion and mean error incremental computations transformation result of the subregion；
The position of the transformation result of the GPS coordinate C is identified on the target map of mobile device.
Further, described according to basic geological study data, target area is divided into multiple subregion grid A1~An, point
The WGS84 coordinate system coordinate of each sub-regions grid is not sought to seven parameter of conversion of target map coordinate system coordinate, comprising:
According to basic geological study data, the geospatial area of target area covering is subjected to region division, is divided into multiple
Subregion grid A1~An, each grid is topological adjacency relationship；
For subregion grid Ai, choose equally distributed multiple coordinate points P'i1~P'im, wherein 1≤i≤n, m >=3；
Using least square method, subregion grid A is calculatediSeven parameter F of conversioni。
Further, least square method is being utilized, is calculating subregion grid AiSeven parameter F of conversioniLater, further includes: to meter
Obtained seven parameter F of conversioniIt tests, if passing through seven parameter F of the conversioniThe resultant error value ε < being converted to is default
Threshold value, it is determined that seven parameter F of the conversioniWith grid AiMatch, otherwise chooses equally distributed multiple coordinate points again
P'i1~P'im, using least square method, calculate subregion grid AiSeven parameter F of conversioni, preset until transformed error value is less than
Threshold value.
Further, multiple coordinate points Pi1~Pim, refer to: for subregion grid Ai, choose equally distributed multiple
Coordinate points Pi1~Pim, the coordinate points Pi1~PimWith the coordinate points P'i1~P'imIt is not overlapped, with actual measurement or map acquisition
Mode obtain coordinate points PijCoordinate under WGS84 coordinate systemAnd the coordinate under target map coordinate system
Further, seven parameter of conversion using each sub-regions grid seeks WGS84 coordinate system and target
Mean error increment between map coordinates system, comprising:
For subregion grid AiThe coordinate points P of middle selectionij, calculate seven-parameter transformation resultAnd it calculates
ErrorThen mean error increment Delta PiTo be calculate by the following formula.
On the other hand, the present invention also provides a kind of systems for improving GIS mobile terminal Orientation on map precision, comprising:
Target area is divided into multiple subregion grid A according to basic geological study data by parameter calculating module1~An, point
The WGS84 coordinate system coordinate of each sub-regions grid is not sought to seven parameter of conversion of target map coordinate system coordinate；
Error calculating module, in subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim, using described each
Seven parameter of conversion of subregion grid seeks the mean error increment between WGS84 coordinate system and target map coordinate system；
Coordinate transferring, by mobile device obtain GPS coordinate C respectively with each sub-regions grid A1~AnIt carries out empty
Between overlay analysis, judge the affiliated subregion of GPS coordinate C, utilize seven parameter of conversion and mean error increment of the subregion
Calculate transformation result；
As a result output module identifies the position of the transformation result of the GPS coordinate C on the target map of mobile device.
Further, the parameter calculating module, comprising:
The geospatial area of target area covering is carried out region and drawn by region division module according to basic geological study data
Point, it is divided into multiple subregion grid A1~An, each grid is topological adjacency relationship；
Coordinate points choose module, for subregion grid Ai, choose equally distributed multiple coordinate points P'i1~P'im,
In, 1≤i≤n, m >=3；
Computing module calculates subregion grid A using least square methodiSeven parameter F of conversioni。
Further, the parameter calculating module, further includes:
Parametric test module, for the seven parameter F of conversion being calculatediIt tests, if passing through seven ginseng of conversion
Number FiThe resultant error value ε < preset threshold being converted to, it is determined that seven parameter F of the conversioniWith grid AiMatch, it is no
Equally distributed multiple coordinate points P' are then chosen againi1~P'im, using least square method, calculate subregion grid AiConversion
Seven parameter Fi, until transformed error value is less than preset threshold.
Further, multiple coordinate points P that the error calculating module is choseni1~Pim, refer to:
For subregion grid Ai, choose equally distributed multiple coordinate points Pi1~Pim, the coordinate points Pi1~PimWith institute
State coordinate points P'i1~P'imIt is not overlapped, obtains coordinate points P in such a way that actual measurement or map acquireijUnder WGS84 coordinate system
CoordinateAnd the coordinate under target map coordinate system
Further, the coordinate transferring, is specifically used for:
In subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim,
For subregion grid AiThe coordinate points P of middle selectionij, calculate seven-parameter transformation resultAnd it calculates
ErrorThen mean error increment Delta PiTo be calculate by the following formula.
The beneficial effects of the present invention are: improving under the premise of independent of high-grade confidential data and using non-concerning security matters
GPS coordinate is converted to the conversion accuracy of national Xi'an 80, Beijing 54 and Local Independent Coordinate System, usual transformed error by seven parameters
Higher than 30 meters, the present invention can be by control errors within 2 meters, and it is linear to have error.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart；
Fig. 2 is present system structure chart.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
The technical issues of present invention is for described in background technique, proposes a kind of raising GIS mobile terminal Orientation on map
The method and system of precision are carried out on the one hand by covering in geographical coverage area in target map by certain partition method
Area grid divides, and different area grids uses seven different parameters, and decrease independently solves brought by non-seven parameter of concerning security matters
Error influences；On the other hand by carrying out the secondary correction of coordinate after seven-parameter transformation, pass through the common of one two two steps
Effect, can make mobile device within the scope of the entire project implementation, and coordinate conversion reaches higher precision.
Specifically, as shown in Figure 1, a kind of method for improving GIS mobile terminal Orientation on map precision, comprising the following steps:
Step 100, according to the basic geological studies data such as DEM and administrative area, by the geospatial area of target area covering into
Row region division is divided into multiple subregion grid A1~An, each grid is topological adjacency relationship；Grid should meet following as far as possible
Condition: in same grid, the variation of landforms elevation is small, and grid overall profile avoids long and narrow.
Step 200, for subregion grid Ai, choose equally distributed multiple coordinate points P'i1~P'im, wherein 1≤i≤
N, m >=3；Its WGS84 coordinate and target map coordinate system coordinate are obtained in such a way that field survey or map acquire (such as country west
Peace 80, Beijing 54 etc.), for target-based coordinate system, geodetic height is not necessarily.Using least square method, subregion grid is calculated
AiSeven parameter F of conversioni；
Step 300, to the seven parameter F of conversion being calculatediIt tests, if passing through seven parameter F of the conversioniIt converts
The resultant error value ε < preset threshold arrived, it is determined that seven parameter F of the conversioniWith grid AiMatch, otherwise re-executes
Step 200, until transformed error value is less than preset threshold.
Step 400, for subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim, multiple coordinates described here
Point Pi1~Pim, refer to: for subregion grid Ai, choose equally distributed multiple coordinate points Pi1~Pim, the coordinate points Pi1~
PimWith the coordinate points P'i1~P'imIt is not overlapped, obtains coordinate points P in such a way that actual measurement or map acquireijIn WGS84 coordinate
Coordinate under systemAnd the coordinate under target map coordinate system
Step 500, for subregion grid AiThe coordinate points P of middle selectionij, calculate seven-parameter transformation resultAnd calculate errorThen mean error increment Delta PiTo be calculate by the following formula.
Step 600, by mobile device obtain GPS coordinate C respectively with each sub-regions grid A1~AnCarry out space overlapping
Analysis, judges the affiliated subregion grid A of the GPS coordinate Ci, utilize the seven parameter F of conversion of the subregioniAnd mean error increment
Calculate transformation result R, R=Fi(C)-ΔPi；
Step 700, the position of the transformation result R of the GPS coordinate C is drawn on the target map of mobile device, is identified
Plate, smart phone be presently in geographical location, or storage transformation result.
Based on the above method, the present invention also provides a kind of system for improving GIS mobile terminal Orientation on map precision, such as Fig. 2
It is described, comprising:
Target area is divided into multiple subregion grid A according to basic geological study data by parameter calculating module1~An, point
The WGS84 coordinate system coordinate of each sub-regions grid is not sought to seven parameter of conversion of target map coordinate system coordinate；
Error calculating module, in subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim, using described each
Seven parameter of conversion of subregion grid seeks the mean error increment between WGS84 coordinate system and target map coordinate system；
Coordinate transferring, by mobile device obtain GPS coordinate C respectively with each sub-regions grid A1~AnIt carries out empty
Between overlay analysis, judge the affiliated subregion of GPS coordinate C, utilize seven parameter of conversion and mean error increment of the subregion
Calculate transformation result；
As a result output module identifies the position of the transformation result of the GPS coordinate C on the target map of mobile device.
Further, the parameter calculating module, comprising:
The geospatial area of target area covering is carried out region and drawn by region division module according to basic geological study data
Point, it is divided into multiple subregion grid A1~An, each grid is topological adjacency relationship；
Coordinate points choose module, for subregion grid Ai, choose equally distributed multiple coordinate points P'i1~P'im,
In, 1≤i≤n, m >=3；
Computing module calculates subregion grid A using least square methodiSeven parameter F of conversioni。
Further, the parameter calculating module, further includes:
Parametric test module, for the seven parameter F of conversion being calculatediIt tests, if passing through seven ginseng of conversion
Number FiThe resultant error value ε < preset threshold being converted to, it is determined that seven parameter F of the conversioniWith grid AiMatch, it is no
Equally distributed multiple coordinate points P' are then chosen againi1~P'im, using least square method, calculate subregion grid AiConversion
Seven parameter Fi, until transformed error value is less than preset threshold.
The present invention is independent of seven parameter of concerning security matters, for solving GIS mobile application especially territory information
Change in industrial application, equipment acquisition GPS coordinate be converted into national Xi'an 80, Beijing 54, independent local coordinate system map reference,
And its conversion accuracy is improved, to realize the precise marking current location on such map, usual transformed error is higher than 30 meters,
The present invention can be by control errors within 2 meters, and it is linear to have error.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for improving GIS mobile terminal Orientation on map precision, which comprises the following steps:
According to basic geological study data, target area is divided into multiple subregion grid A1~An, each sub-regions net is sought respectively
Conversion seven parameter of the WGS84 coordinate system coordinate of lattice to target map coordinate system coordinate；
For subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim, utilize the conversion seven of each sub-regions grid
Parameter seeks the mean error increment between WGS84 coordinate system and target map coordinate system；
By mobile device obtain GPS coordinate C respectively with each sub-regions grid A1~AnSpatial overlay analysis is carried out, judges institute
The affiliated subregion of GPS coordinate C is stated, seven parameter of conversion and mean error incremental computations transformation result of the subregion are utilized；
The position of the transformation result of the GPS coordinate C is identified on the target map of mobile device.
2. a kind of method for improving GIS mobile terminal Orientation on map precision according to claim 1, which is characterized in that described
According to basic geological study data, target area is divided into multiple subregion grid A1~An, each sub-regions grid is sought respectively
Seven parameter of conversion from WGS84 coordinate system coordinate to target map coordinate system coordinate, comprising:
According to basic geological study data, the geospatial area of target area covering is subjected to region division, is divided into multiple sub-districts
Domain grid A1~An, each grid is topological adjacency relationship；
For subregion grid Ai, choose equally distributed multiple coordinate points P'i1~P'im, wherein 1≤i≤n, m >=3；
Using least square method, subregion grid A is calculatediSeven parameter F of conversioni。
3. a kind of method for improving GIS mobile terminal Orientation on map precision according to claim 2, which is characterized in that in benefit
With least square method, subregion grid A is calculatediSeven parameter F of conversioniLater, further includes: to seven parameter of conversion being calculated
FiIt tests, if passing through seven parameter F of the conversioniThe resultant error value ε < preset threshold being converted to, it is determined that described turn
Change seven parameter FiWith grid AiMatch, otherwise chooses equally distributed multiple coordinate points P' againi1~P'im, utilize minimum
Square law calculates subregion grid AiSeven parameter F of conversioni, until transformed error value is less than preset threshold.
4. a kind of method for improving GIS mobile terminal Orientation on map precision according to Claims 2 or 3, which is characterized in that institute
The multiple coordinate points P statedi1~Pim, refer to: for subregion grid Ai, choose equally distributed multiple coordinate points Pi1~Pim, described
Coordinate points Pi1~PimWith the coordinate points P'i1~P'imIt is not overlapped, obtains coordinate points P in such a way that actual measurement or map acquireij
Coordinate under WGS84 coordinate systemAnd the coordinate under target map coordinate system
5. a kind of method for improving GIS mobile terminal Orientation on map precision according to claim 4, which is characterized in that described
Seven parameter of conversion using each sub-regions grid seek being averaged between WGS84 coordinate system and target map coordinate system
Error increment, comprising:
For subregion grid AiThe coordinate points P of middle selectionij, calculate seven-parameter transformation resultAnd calculate errorThen mean error increment Delta PiTo be calculate by the following formula.
6. a kind of system for improving GIS mobile terminal Orientation on map precision characterized by comprising
Target area is divided into multiple subregion grid A according to basic geological study data by parameter calculating module1~An, ask respectively
Take conversion seven parameter of the WGS84 coordinate system coordinate of each sub-regions grid to target map coordinate system coordinate；
Error calculating module, in subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim, utilize each sub-district
Seven parameter of conversion of domain grid seeks the mean error increment between WGS84 coordinate system and target map coordinate system；
Coordinate transferring, by mobile device obtain GPS coordinate C respectively with each sub-regions grid A1~AnIt is folded to carry out space
Bonus point analysis, judges the affiliated subregion of GPS coordinate C, utilizes seven parameter of conversion and mean error incremental computations of the subregion
Transformation result；
As a result output module identifies the position of the transformation result of the GPS coordinate C on the target map of mobile device.
7. a kind of system for improving GIS mobile terminal Orientation on map precision according to claim 6, which is characterized in that described
Parameter calculating module, comprising:
The geospatial area of target area covering is carried out region division, drawn by region division module according to basic geological study data
It is divided into multiple subregion grid A1~An, each grid is topological adjacency relationship；
Coordinate points choose module, for subregion grid Ai, choose equally distributed multiple coordinate points P'i1~P'im, wherein 1≤
I≤n, m >=3；
Computing module calculates subregion grid A using least square methodiSeven parameter F of conversioni。
8. a kind of system for improving GIS mobile terminal Orientation on map precision according to claim 7, which is characterized in that described
Parameter calculating module, further includes:
Parametric test module, for the seven parameter F of conversion being calculatediIt tests, if passing through seven parameter F of the conversioniTurn
The resultant error value ε < preset threshold got in return, it is determined that seven parameter F of the conversioniWith grid AiMatch, otherwise again
Choose equally distributed multiple coordinate points P'i1~P'im, using least square method, calculate subregion grid AiSeven parameter of conversion
Fi, until transformed error value is less than preset threshold.
9. according to a kind of system for improving GIS mobile terminal Orientation on map precision of claim 7 or 8, which is characterized in that institute
State multiple coordinate points P of error calculating module selectioni1~Pim, refer to:
For subregion grid Ai, choose equally distributed multiple coordinate points Pi1~Pim, the coordinate points Pi1~PimWith the seat
Punctuate P'i1~P'imIt is not overlapped, obtains coordinate points P in such a way that actual measurement or map acquireijCoordinate under WGS84 coordinate systemAnd the coordinate under target map coordinate system
10. a kind of system for improving GIS mobile terminal Orientation on map precision according to claim 9, which is characterized in that described
Coordinate transferring is specifically used for:
In subregion grid Ai, multiple coordinate points P are chosen respectivelyi1~Pim,
For subregion grid AiThe coordinate points P of middle selectionij, calculate seven-parameter transformation resultAnd calculate errorThen mean error increment Delta PiTo be calculate by the following formula.
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