CN109191579A - Method, apparatus, computer equipment and the storage medium of coordinate conversion - Google Patents
Method, apparatus, computer equipment and the storage medium of coordinate conversion Download PDFInfo
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Abstract
The present invention relates to method, apparatus, computer equipment and the storage mediums of coordinate conversion, belong to technical field of geographic information.The described method includes: determining the characteristic parameter that the first coordinate system is converted to the second coordinate system according to known point；The conversion residual error of the known point and the coordinate correction amount of grid points are determined according to the characteristic parameter；The residual error reduction of the grid points is determined according to the conversion residual error of the known point；The grid reduction that the grid points are determined according to the coordinate correction amount and the residual error reduction establishes transformation model according to the grid reduction；The transformation model is used to determine that the point to be converted in the first coordinate system to be transformed into the coordinate in second coordinate system.Above-mentioned technical proposal, solve the problems, such as coordinate transform process ignore point spatial coherence make convert coordinate accuracy it is not high.Grid reduction is solved on the basis of considering known point reduction, accounts for spatial coherence, realizes high-precision coordinate conversion.
Description
Technical field
The present invention relates to technical field of geographic information, more particularly to the method, apparatus of coordinate conversion, computer equipment and
Storage medium.
Background technique
Presently, there are a variety of coordinate systems, due to differences such as the ellipsoids, frame, epoch that are used between different coordinate systems,
This just needs to carry out the conversion of coordinate, such as 1980 coordinate system of Xi'an is turned to CGCS2000 (2000 national earth coordinates)
It changes.Traditional coordinate conversion is often using modes such as four parameters, seven parameter models.But four parameters are suitable only for difference of longitude, latitude
Area coordinate conversion of the degree difference less than 2 degree, seven parameters are suitable only for the area coordinate conversion of provincial, and municipal level.In recent years, also there is research
Personnel propose the conversion that coordinate is realized using grid correction model.In realizing process of the present invention, inventor has found existing skill
At least there are the following problems in art: conventional grid correction model corrects in grid points only according to the anti-weighting of distance to realize
The calculating of amount has ignored the spatial coherence of point in this way, and obtained conversion coordinate accuracy is not high.
Summary of the invention
Based on this, the present invention provides method, apparatus, computer equipment and the storage mediums of coordinate conversion, can obtain standard
True conversion coordinate.
The content of the embodiment of the present invention is as follows:
A kind of method of coordinate conversion, comprising the following steps: determined according to known point and the first coordinate system is converted to second
The characteristic parameter of coordinate system；The known point has the coordinate of first coordinate system and the coordinate of the second coordinate system；According to institute
It states characteristic parameter and determines the conversion residual error of the known point and the coordinate correction amount of the grid points in the grid that pre-establishes；Root
The residual error reduction of the grid points is determined according to the conversion residual error of the known point；According to the coordinate correction amount and the residual error
Reduction determines the grid reduction of the grid points, establishes transformation model according to the grid reduction；The transformation model
Point to be converted for determining in the first coordinate system is transformed into the coordinate in second coordinate system.
The characteristic parameter includes four parameters in one of the embodiments,；Described determined according to known point is sat first
The step of mark system is converted to the characteristic parameter of the second coordinate system, comprising: determine first coordinate of the known point in the first coordinate system
And the second coordinate in the second coordinate system, calculate four parameters that first coordinate is converted to the second coordinate.
The coordinate of the grid points in the grid pre-established is determined according to the characteristic parameter in one of the embodiments,
The step of reduction, comprising: determine first grid coordinate of the grid points in the first coordinate system, it is true according to four parameter
Fixed the second grid coordinate of the grid points in the second coordinate system；Institute is determined according to the first grid coordinate and the second grid coordinate
State the coordinate correction amount of grid points.
The conversion residual error according to the known point determines that the residual error of the grid points changes in one of the embodiments,
The step of positive quantity, comprising: determine the known point at a distance from the grid points；According to the conversion residual sum institute of the known point
Distance is stated, the residual error reduction of the grid points is determined by distance weighting method.
It is described in one of the embodiments, to determine that grid corrects according to the coordinate correction amount and the residual error reduction
The step of amount, comprising: the grid reduction is obtained according to the sum of the coordinate correction amount and the residual error reduction.
It in one of the embodiments, include the grid reduction of multiple grid points in the transformation model；Described
The grid reduction that the grid points are determined according to the coordinate correction amount and the residual error reduction, according to the grid reduction
After the step of establishing transformation model, further includes: determine target lattice corresponding with the point to be converted from the transformation model
The grid reduction of site；According to the grid reduction of the target mesh point, determined by bilinear interpolation method described wait turn
Change reduction a little；It is determined according to the reduction of the described to be converted o'clock coordinate in the first coordinate system and the point to be converted
Coordinate of the point to be converted in second coordinate system.
It is described in one of the embodiments, that the spy that the first coordinate system is converted to the second coordinate system is determined according to known point
Before the step of levying parameter, further includes: the region to be analyzed within the scope of the grid points pre-set radius is determined, from described to be analyzed
The known point with the coordinate of first coordinate system and the second coordinate system is determined in region.
Correspondingly, the embodiment of the present invention provides a kind of device of coordinate conversion, comprising: parameter determination module is used for basis
Known point determines the characteristic parameter that the first coordinate system is converted to the second coordinate system；The known point has first coordinate system
Coordinate and the second coordinate system coordinate；Reduction determining module, for determining the known point according to the characteristic parameter
The coordinate correction amount of conversion residual error and the grid points in the grid pre-established；It is determined according to the conversion residual error of the known point
The residual error reduction of the grid points；And model building module, for being corrected according to the coordinate correction amount and the residual error
Amount determines that the grid reduction of the grid points establishes transformation model；The transformation model be used for determine in the first coordinate system to
Transfer point is transformed into the coordinate in second coordinate system.
The method and device of above-mentioned coordinate conversion is determined according to known point in the coordinate of the first coordinate system and the second coordinate system
Characteristic parameter；The conversion residual error of known point is determined according to this feature parameter, and the residual error of grid points is determined according to the conversion residual error
Reduction；The coordinate correction amount of grid points is determined according to required characteristic parameter；It is true according to residual error reduction and coordinate correction amount
It fixes and net reduction and establishes transformation model, determined by transformation model and the point to be converted in the first coordinate system is transformed into
Coordinate after two coordinate systems.Grid reduction is solved on the basis of considering known point reduction, accounts for spatial coherence,
Realize high-precision coordinate conversion.
A kind of computer equipment can be run on a memory and on a processor including memory, processor and storage
Computer program, the processor performs the steps of when executing the computer program to be determined according to known point by the first seat
Mark system is converted to the characteristic parameter of the second coordinate system；The known point has the coordinate and the second coordinate system of first coordinate system
Coordinate；According to the grid points in the grid that the characteristic parameter determines the conversion residual error of the known point and pre-establishes
Coordinate correction amount；The residual error reduction of the grid points is determined according to the conversion residual error of the known point；Changed according to the coordinate
Positive quantity and the residual error reduction determine the grid reduction of the grid points, establish modulus of conversion according to the grid reduction
Type；The transformation model is used to determine that the point to be converted in the first coordinate system to be transformed into the coordinate in second coordinate system.
Above-mentioned computer equipment solves grid reduction on the basis of considering known point reduction, accounts for space
Correlation realizes high-precision coordinate conversion.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
The characteristic parameter for determining according to known point and the first coordinate system being converted to the second coordinate system is performed the steps of when row；It is described
Know the coordinate of a little coordinate with first coordinate system and the second coordinate system；The known point is determined according to the characteristic parameter
Conversion residual error and the grid points in the grid that pre-establishes coordinate correction amount；It is true according to the conversion residual error of the known point
The residual error reduction of the fixed grid points；The lattice of the grid points are determined according to the coordinate correction amount and the residual error reduction
Net reduction establishes transformation model according to the grid reduction；The transformation model be used for determine in the first coordinate system to
Transfer point is transformed into the coordinate in second coordinate system.
Above-mentioned computer readable storage medium solves grid reduction on the basis of considering known point reduction, cares for
And spatial coherence, realize high-precision coordinate conversion.
Detailed description of the invention
Fig. 1 is the applied environment figure of the method for coordinate conversion in one embodiment；
Fig. 2 is the flow diagram of the method for coordinate conversion in one embodiment；
Fig. 3 is the schematic diagram of the grid in region to be converted in one embodiment；
Fig. 4 is the three dimensional structure diagram of transformation model in one embodiment；
Fig. 5 projects to the schematic diagram of grid for point to be converted in one embodiment；
Fig. 6 is the schematic diagram that known point is chosen in one embodiment；
Fig. 7 is the flow diagram of the method for coordinate conversion in another embodiment；
Fig. 8 is the structural block diagram of the device of coordinate conversion in one embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The method of coordinate conversion provided by the present application can be applied in computer equipment as shown in Figure 1.The computer
Equipment can be server, and internal structure chart can be as shown in Figure 1.The computer equipment includes being connected by system bus
Processor, memory, network interface and database.Wherein, the processor of the computer equipment calculates and controls energy for providing
Power.The memory of the computer equipment includes non-volatile memory medium, built-in storage.The non-volatile memory medium is stored with
Operating system, computer program and database.The built-in storage is operating system and computer in non-volatile memory medium
The operation of program provides environment.The database of the computer equipment is for storing coordinate, coordinate correction amount, residual error reduction, lattice
The data such as net reduction.The network interface of the computer equipment is used to communicate with external terminal by network connection.The calculating
A kind of machine program realizes coordinate conversion method when being executed by processor.
It will be understood by those skilled in the art that structure shown in Fig. 1, only part relevant to application scheme is tied
The block diagram of structure does not constitute the restriction for the computer equipment being applied thereon to application scheme, specific computer equipment
It may include perhaps combining certain components or with different component layouts than more or fewer components as shown in the figure.
The embodiment of the present invention provides method, apparatus, computer equipment and the storage medium of a kind of coordinate conversion.Individually below
It is described in detail.
In one embodiment, it as shown in Fig. 2, providing a kind of method of coordinate conversion, is able to achieve and treats transition region
The coordinate of interior point to be converted is converted, method includes the following steps:
S201, the characteristic parameter that the first coordinate system is converted to the second coordinate system is determined according to known point；The known point
The coordinate of coordinate and the second coordinate system with first coordinate system.
In this step, it is known that the coordinate with the first coordinate system and the second coordinate system is put, according to conventional calculation method
The characteristic parameter of transformational relation between the first coordinate system of computational representation and the second coordinate system.
Wherein, the first coordinate system and the second coordinate system can refer to 1980 coordinate system of Xi'an, CGCS2000 coordinate system, Beijing 54
The coordinate systems such as coordinate system, WGS-84 coordinate system, the embodiment of the present invention do not limit the classification of the first coordinate system and the second coordinate system
System can guarantee that the two is different and can carry out coordinate conversion.
Characteristic parameter refers to the parameter of the transformational relation between the first coordinate system of characterization and the second coordinate system, can be four
The parameters such as parameter, seven parameters.
In addition, the known point can refer to all coordinates with the first coordinate system and the second coordinate system in region to be converted
Point, be also possible to a part (such as: the point within the scope of pre-set radius) therein.Also, it is known that point can be area to be converted
Random point (choosing as long as the coordinate that it has the first coordinate system and the second coordinate system) in domain, is also possible to according to one
Certain points that fixed rule chooses from multiple known points in region to be converted.
Lattice in S202, the conversion residual error that the known point is determined according to the characteristic parameter and the grid pre-established
The coordinate correction amount of site；The residual error reduction of the grid points is determined according to the conversion residual error of the known point.
This step is accomplished that the coordinate correction amount of grid points and the determination of residual error reduction.Wherein, coordinate correction amount
It is the characteristic parameter that is obtained according to previous step to determine；And residual error reduction is the root after determining the conversion residual error of known point
It is determined according to the conversion residual error and known point of known point and the relationship of grid points.
Wherein, the grid pre-established refers to the latice drawn on the first coordinate system according to certain mesh spacing
Picture.Wherein mesh spacing refers to: the longitude and latitude difference of the grid adjacent in length and breadth of established grid.Mesh spacing is mainly known to
The equispaced of point determines that general mesh spacing is less than the equispaced of known point；Can also according to transform graphical or to
The size of transition region determines.Wherein transform graphical refers to geography that need to convert, according to certain standard progress framing
Information graphic.
The grid established in a certain region to be converted can with as shown in figure 3, the grid in Fig. 3 by grid adjacent in length and breadth
It staggeredly constitutes, each grid points has its coordinate on the first coordinate system.
S203, the grid reduction that the grid points are determined according to the coordinate correction amount and the residual error reduction, root
Transformation model is established according to the grid reduction；The transformation model is for determining that the point to be converted in the first coordinate system is transformed into
Coordinate in second coordinate system.
Wherein, point to be converted refers to the coordinate with the first coordinate system but does not know its coordinate in the second coordinate system
Point.Grid reduction refers to the reduction of some grid points, and grid points are distributed in each place in region to be converted, each
Point to be converted can determine the reduction of oneself according to neighbouring grid points.
In this step, the grid reduction of grid points is determined according to coordinate correction amount and residual error reduction, and according to lattice
Net reduction establishes transformation model, according to the transformation model and the to be converted o'clock coordinate in the first coordinate system just can determine that
The coordinate of transfer point in the second coordinate system.
Transformation model can be determined according to the grid reduction of one or more grid points in grid, such as can be
It is determined according to the grid reduction of all grid points in region to be converted.
Further, the method for establishing transformation model, which can be, deposits identified grid reduction according to certain format
It puts in one file, this document can serve as transformation model.Required mesh can be therefrom found out by reading this document
The grid reduction of style site, and then point to be converted is determined in the second coordinate system according to the grid reduction of target mesh point
Coordinate.Wherein, target mesh point can be multiple.
The present embodiment, the acquisition process of grid reduction using multiple known points of neighboring area reduction, i.e., these
Known point has been involved in the solution of grid reduction, accounts for spatial coherence, and the transformation model obtained in this way is continuously smooth
, so that the coordinate conversion in big region has continuity, to realize the seamless big area coordinate conversion of high-precision.
In one embodiment, the characteristic parameter includes four parameters；It is described to be determined according to known point by the first coordinate system
The step of being converted to the characteristic parameter of the second coordinate system, comprising: determine first coordinate of the known point in the first coordinate system and
The second coordinate in the second coordinate system calculates four parameters that first coordinate is converted to the second coordinate.
If known point be it is multiple, can therefrom select a known point, according to the first coordinate of selected known point and
Second coordinate determines four parameters.Four parameters can also be determined according to the coordinate of all or part known point, if obtaining
There is four parameter of multiple groups, then these four parameters can be integrated by certain operation.
It is four parameters embodiment defines characteristic parameter, the determination process of four parameters is using conventional method realization
It can.Four parameters consider the deviation of the coordinate conversion in small range region, can effectively improve the precision of identified grid reduction.
The determination process of four parameters is simply direct simultaneously, and the calculating for follow-up correction amount provides Data safeguard.
In one embodiment, the coordinate correction of the grid points in the grid pre-established is determined according to the characteristic parameter
The step of amount, comprising: determine first grid coordinate of the grid points in the first coordinate system, institute is determined according to four parameter
State the second grid coordinate of grid points in the second coordinate system；The lattice are determined according to the first grid coordinate and the second grid coordinate
The coordinate correction amount of site.
Because grid is established on the basis of the first coordinate system, each grid points are in the first coordinate system
First grid coordinate can be directly obtained.
Due to transformational relation of four parameter characterizations between the first coordinate system and the second coordinate system, according to four parameters
It just can determine that out the second grid coordinate of grid in the second coordinate system, the first grid coordinate and the second grid coordinate compared
Compared with the coordinate correction amount that (such as: seeking difference) just can determine that out grid points.
The present embodiment proposes to solve grid points using four parametric methods of part on the basis of generally conventional grid correction method
Coordinate correction amount determines the second grid coordinate of grid according to four parameters, and according to the first grid coordinate and the second grid coordinate
To determine the coordinate correction amount of grid.The coordinate correction amount had not only characterized grid in the coordinate of the first coordinate system, but also characterized lattice
The coordinate of net in the second coordinate system, therefore can be used to determine the coordinate of point to be converted in the second coordinate system.
In one embodiment, the conversion residual error according to the known point determines the residual error reduction of the grid points
The step of, comprising: determine the known point at a distance from the grid points；According to the conversion residual sum of the known point away from
From determining the residual error reduction of the grid points by distance weighting method.
Wherein, determine that the process of the residual error reduction of grid points can be with by distance weighting method are as follows: pass through inverse distance-weighting
Method determines weight (distance bigger weight smaller) of the conversion residual error for residual error reduction of each known point, combines conversion later
The residual error reduction of residual error and its corresponding weight computing grid points.
The present embodiment is weighted place during solving residual error reduction, according to the conversion residual error of each known point
Reason, so that the calculation result of grid points is more in line with true value, improves conversion accuracy.
In one embodiment, described that grid reduction is determined according to the coordinate correction amount and the residual error reduction
Step, comprising: the grid reduction is obtained according to the sum of the coordinate correction amount and the residual error reduction.
The present embodiment determines that grid is corrected according to the residual error reduction and coordinate correction amount that acquire in previous embodiment
Amount.Not only allow for the grid deviation of conversion process, it is also contemplated that conversion residual error, so that the considerations of deviation more fully, it can
More accurate grid reduction is obtained, and then realizes more accurate coordinate conversion.
It in one embodiment, include the grid reduction of multiple grid points in the transformation model；It is described according to institute
It states coordinate correction amount and the residual error reduction determines the grid reduction of the grid points, established according to the grid reduction
After the step of transformation model, further includes: determine target mesh point corresponding with the point to be converted from the transformation model
Grid reduction；According to the grid reduction of the target mesh point, the point to be converted is determined by bilinear interpolation method
Reduction；According to described to be converted o'clock coordinate and the point to be converted in the first coordinate system reduction determine described in
Coordinate of the point to be converted in second coordinate system.
It include that the grid reduction of multiple grid points can refer in transformation model；Transformation model includes in region to be converted
The grid reduction of all grid points.The tomograph drawn according to transformation model as shown in figure 4, in Fig. 4 different coordinates
Grid reduction may be different.Grid reduction in Fig. 4 is bigger to illustrate that deviation is bigger, and Fig. 4 has fully demonstrated grid correction
The necessity of amount, because if not considering grid reduction, then biggish deviation will be had by converting later coordinate.
Wherein, the reduction of the coordinate according to described to be converted o'clock in the first coordinate system and the point to be converted determines
The realization process of coordinate of the point to be converted in second coordinate system can be with are as follows: by be converted o'clock in the first coordinate system
Coordinate coordinate of the point to be converted in second coordinate system can be obtained plus the reduction of point to be converted.
In the present embodiment, to carry out coordinate conversion to a certain point to be converted, it is first determined the lattice where the point to be converted
Net determines the reduction of point to be converted (here, point to be converted claims by bilinear interpolation method according to the grid reduction of grid points
For interpolated point).The reduction of point to be converted can be accurately determined out, and then determines that point to be converted converts later coordinate.
In one embodiment, determine that the process of the reduction of interpolated point can be with by bilinear interpolation method are as follows:
(five-pointed star indicates that interpolated point, soft dot indicate grid points in Fig. 5) as shown in Figure 5, the corresponding lattice of interpolated point
There are four grid points in net.Interpolation point is projected respectively to the x-axis of place grid, y-axis direction, calculates separately projector distance, root
Corresponding weight is determined according to the projector distance of x-axis, y-axis direction, is changed according to the grid of these weights and corresponding four grid points
Positive quantity determines the reduction of interpolated point.
In one embodiment, the corresponding grid points of interpolated point can be with more than four, for example, can be 8,16 etc.
Deng.
In one embodiment, described to determine that the feature that the first coordinate system is converted to the second coordinate system is joined according to known point
Before several steps, further includes: the region to be analyzed within the scope of the grid points pre-set radius is determined, from the region to be analyzed
Middle determination has the known point of the coordinate of first coordinate system and the second coordinate system.
Wherein, pre-set radius can be 1m, 10m, 10km etc., and the radius is changeable, and the embodiment of the present invention is to default half
The size of diameter is with no restrictions.
The present embodiment determines region to be analyzed according to pre-set radius centered on grid points, and institute is determined from region to be analyzed
There is known point, determines that the grid reduction of grid points, all known points have both participated in grid reduction according to these known points
Solution, fully considered spatial coherence, accurate grid reduction can be obtained.
Wherein, the schematic diagram for known point being chosen in region to be analyzed is shown in Fig. 6, using the corresponding grid points in the center of circle as in
The center of these circles and all known points are all chosen and (do not consider other grid points temporarily) by the heart.On the right side of Fig. 6
In figure, central point is grid points, other points are known point.
In one embodiment, as shown in fig. 7, providing a kind of method of coordinate conversion, comprising the following steps:
S701, region to be analyzed within the scope of grid points pre-set radius is determined, determination has from the region to be analyzed
The known point of the coordinate of first coordinate system and the second coordinate system.
S702, first coordinate of the known point in the first coordinate system and the second coordinate in the second coordinate system are determined,
Calculate four parameters that first coordinate is converted to the second coordinate.
S703, the conversion residual error that the known point is determined according to four parameter.
S704, determine the known point at a distance from the grid points；According to the conversion residual sum of the known point
Distance determines the residual error reduction of the grid points by distance weighting method.
S705, it determines first grid coordinate of the grid points in the first coordinate system, institute is determined according to four parameter
State the second grid coordinate of grid points in the second coordinate system；The lattice are determined according to the first grid coordinate and the second grid coordinate
The coordinate correction amount of site.
S706, grid reduction is obtained according to the sum of the coordinate correction amount and the residual error reduction, according to the lattice
Net reduction establishes transformation model.
S707, the grid reduction that target mesh point corresponding with point to be converted is determined from the transformation model；According to
The grid reduction of the target mesh point determines the reduction of the point to be converted by bilinear interpolation method.
S708, it is determined according to the reduction of the described to be converted o'clock coordinate in the first coordinate system and the point to be converted
Coordinate of the point to be converted in second coordinate system.
The present embodiment solves grid reduction on the basis of considering known point reduction, accounts for spatial coherence,
Realize high-precision coordinate conversion.
The above method in order to better understand, the application example of the method for a coordinate conversion of the present invention set forth below.It should
Application example is accomplished that the coordinate between 1980 coordinate of Xi'an and CGCS2000 coordinate is converted, wherein having in region to be converted
Know point (each known point has 1980 coordinate of Xi'an and CGCS2000 coordinate).Detailed description are as follows:
One, transformation model is constructed:
1, in a known area map (region to be converted) known point 1980 coordinate system coordinate of Xi'an and CGCS2000
Coordinate system coordinate.
2, grid is made on this area map (grid coordinate is 1980 coordinate system coordinate of Xi'an).
3, by taking one of grid points A in grid as an example, grid points A reduction (D is determinedX802000, DY802000), wherein
X indicate X-axis coordinate, Y indicate Y-axis coordinate, under be designated as 2000 expressions be CGCS2000 coordinate system X axis coordinate, subscript
For 80 indicate be 1980 coordinate system of Xi'an X axis coordinate, 802000 indicate to be 1980 coordinate system of Xi'an sit to CGCS2000
The conversion of mark system,
The determination process of reduction is as follows:
S31, all known points are searched within the scope of the appropriate area of grid points A；
S32, coordinate (1980 coordinate system coordinate of Xi'an and CGCS2000 coordinate system seat according to each known point searched
Mark) four parameters of conversion are calculated, and the conversion residual error of each known point is calculated based on four parameter；
S33, each known point is determined at a distance from grid points A, according to the conversion residual error of distance weighting method and known point
Determine residual error the reduction ((d of grid points AX, dY)；
S34, the CGCS2000 coordinate system coordinate that grid points A is calculated according to four parameters acquired, and then calculate grid points A's
Coordinate correction amount (dX802000, dY802000)；
S35, residual error reduction and the summation of coordinate correction amount obtain the grid reduction at grid points A:
(DX802000, DY802000)=(dX802000, dY802000)+(dX, dY)；
Each grid reduction is placed on one according to certain format by S36, the grid reduction for determining other each grid points
In a file, as transformation model.
Two, coordinate conversion is carried out according to transformation model:
4, determine which grid it is located within according to the 1980 coordinate system coordinate of Xi'an of point to be converted (B point).
5, determine point B's to be converted using the grid reduction of four grid points corresponding in bilinear interpolation method and grid
Reduction.
6, the reduction of all points to be converted in 1980 coordinate system of Xi'an is determined, 1980 coordinate system coordinate of Xi'an is plus correction
Amount just obtains coordinate of each point to be converted in CGCS2000, that is, completes 1980 coordinate system of Xi'an to CGCS2000 coordinate system
Coordinate transform process.
The present embodiment solves grid reduction on the basis of considering known point reduction, accounts for spatial coherence,
Realize high-precision coordinate conversion.
It should be noted that for the various method embodiments described above, describing for simplicity, it is all expressed as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described, because according to
According to the present invention, certain steps can use other sequences or carry out simultaneously.
Based on thought identical with the method for coordinate conversion in above-described embodiment, the present invention also provides the dresses of coordinate conversion
It sets, which can be used for executing the method for above-mentioned coordinate conversion.For ease of description, the structure of the Installation practice of coordinate conversion
In schematic diagram, part related to the embodiment of the present invention illustrate only, it will be understood by those skilled in the art that schematic structure is simultaneously
The not restriction of structure twin installation may include perhaps combining certain components or different than illustrating more or fewer components
Component layout.
As described in Figure 8, the device of coordinate conversion includes that parameter determination module 801, reduction determining module 802 and model are built
Formwork erection block 803, detailed description are as follows:
Parameter determination module 801, for determining the feature that the first coordinate system is converted to the second coordinate system according to known point
Parameter；The known point has the coordinate of first coordinate system and the coordinate of the second coordinate system.
Reduction determining module 802, for determining the conversion residual error of the known point and pre- according to the characteristic parameter
The coordinate correction amount for the grid points in grid first established；The residual of the grid points is determined according to the conversion residual error of the known point
Poor reduction.
And model building module 803, for determining the lattice according to the coordinate correction amount and the residual error reduction
The grid reduction of site establishes transformation model；The transformation model is for determining that the point to be converted in the first coordinate system is transformed into
Coordinate in second coordinate system.
The present embodiment solves grid reduction on the basis of considering known point reduction, accounts for spatial coherence,
Realize high-precision coordinate conversion.
In one embodiment, parameter determination module 801, for determining first coordinate of the known point in the first coordinate system
And the second coordinate in the second coordinate system, calculate four parameters that first coordinate is converted to the second coordinate.
In one embodiment, reduction determining module 802, comprising: coordinate determines submodule, for determining the grid
The first grid coordinate o'clock in the first coordinate system, determines of the grid points in the second coordinate system according to four parameter
Two grid coordinates；Reduction determines submodule, for determining the grid points according to the first grid coordinate and the second grid coordinate
Coordinate correction amount.
In one embodiment, reduction determining module 802, be also used to determine the known point and the grid points away from
From；According to distance described in the conversion residual sum of the known point, determine that the residual error of the grid points corrects by distance weighting method
Amount.
In one embodiment, model building module 803 are also used to be corrected according to the coordinate correction amount and the residual error
The sum of amount obtains the grid reduction.
In one embodiment, further includes: target point reduction determining module, for from the transformation model determine with
The grid reduction of the corresponding target mesh point of the point to be converted；To turning point reduction determining module, for according to the mesh
The grid reduction of style site determines the reduction of the point to be converted by bilinear interpolation method；Coordinate transferring is used
It is described to be converted in being determined according to the reduction of the described to be converted o'clock coordinate in the first coordinate system and the point to be converted
Coordinate of the point in second coordinate system.
In one embodiment, further includes: known point determining module, for determining within the scope of the grid points pre-set radius
Region to be analyzed, determined from the region to be analyzed known to the coordinate with first coordinate system and the second coordinate system
Point.
It should be noted that the method that device and coordinate of the invention that coordinate of the invention is converted are converted corresponds,
It is suitable for the device of coordinate conversion in the technical characteristic and its advantages of the embodiment elaboration of the method for above-mentioned coordinate conversion
Embodiment in, for details, please refer to the description in the embodiment of the method for the present invention, and details are not described herein again, hereby give notice that.
In addition, the logical partitioning of each program module is only to lift in the embodiment for the device that the coordinate of above-mentioned example is converted
Example explanation, can according to need in practical application, for example, for corresponding hardware configuration requirement or software realization convenience
Consider, above-mentioned function distribution is completed by different program modules, i.e., the internal structure for the device converted the coordinate divides
At different program modules, to complete all or part of the functions described above.
In one embodiment, a kind of computer equipment is provided, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, processor perform the steps of when executing computer program according to known point
Determine the characteristic parameter that the first coordinate system is converted to the second coordinate system；The known point has the coordinate of first coordinate system
With the coordinate of the second coordinate system；The grid for determining the conversion residual error of the known point according to the characteristic parameter and pre-establishing
In grid points coordinate correction amount；The residual error reduction of the grid points is determined according to the conversion residual error of the known point；Root
The grid reduction that the grid points are determined according to the coordinate correction amount and the residual error reduction, according to the grid reduction
Establish transformation model；The transformation model is for determining that the point to be converted in the first coordinate system is transformed into second coordinate system
Coordinate.
In one embodiment, also performing the steps of the characteristic parameter when processor executes computer program includes
Four parameters；It is described that the step of first coordinate system is converted to the characteristic parameter of the second coordinate system is determined according to known point, comprising: really
Determine first coordinate of the known point in the first coordinate system and the second coordinate in the second coordinate system, calculating is sat described first
Mark is converted to four parameters of the second coordinate.
In one embodiment, it also performs the steps of when processor executes computer program according to the characteristic parameter
The step of determining the coordinate correction amount of the grid points in the grid pre-established, comprising: determine the grid points in the first coordinate
The first grid coordinate in system determines the second grid coordinate of the grid points in the second coordinate system according to four parameter；
The coordinate correction amount of the grid points is determined according to the first grid coordinate and the second grid coordinate.
In one embodiment, it is also performed the steps of when processor executes computer program described according to described known
The step of conversion residual error of point determines the residual error reduction of the grid points, comprising: determine the known point and the grid points
Distance；According to distance described in the conversion residual sum of the known point, the residual error of the grid points is determined by distance weighting method
Reduction.
In one embodiment, it is also performed the steps of when processor executes computer program described according to the coordinate
The step of reduction and the residual error reduction determine grid reduction, comprising: according to the coordinate correction amount and the residual error
The sum of reduction obtains the grid reduction.
In one embodiment, it also performs the steps of when processor executes computer program and is wrapped in the transformation model
Grid reduction containing multiple grid points；It is described that the grid is determined according to the coordinate correction amount and the residual error reduction
The grid reduction of point, after the step of establishing transformation model according to the grid reduction, further includes: from the transformation model
The grid reduction of middle determination target mesh point corresponding with the point to be converted；It is corrected according to the grid of the target mesh point
Amount, the reduction of the point to be converted is determined by bilinear interpolation method；According to described to be converted o'clock in the first coordinate system
The reduction of coordinate and the point to be converted determines coordinate of the point to be converted in second coordinate system.
In one embodiment, it is also performed the steps of when processor executes computer program described true according to known point
Before fixed the step of first coordinate system is converted to the characteristic parameter of the second coordinate system, further includes: determine that the grid points are default
Region to be analyzed in radius determines there is first coordinate system and the second coordinate system from the region to be analyzed
The known point of coordinate.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculated
Machine program performs the steps of when being executed by processor is converted to the second coordinate system for the first coordinate system according to known point is determining
Characteristic parameter；The known point has the coordinate of first coordinate system and the coordinate of the second coordinate system；Joined according to the feature
The coordinate correction amount of the conversion residual error of the determining known point of number and the grid points in the grid pre-established；According to it is described
The conversion residual error for knowing a little determines the residual error reduction of the grid points；It is true according to the coordinate correction amount and the residual error reduction
The grid reduction of the fixed grid points, establishes transformation model according to the grid reduction；The transformation model is for determining
Point to be converted in first coordinate system is transformed into the coordinate in second coordinate system.
In one embodiment, the characteristic parameter packet is also performed the steps of when computer program is executed by processor
Include four parameters；It is described that the step of first coordinate system is converted to the characteristic parameter of the second coordinate system is determined according to known point, comprising:
It determines first coordinate of the known point in the first coordinate system and the second coordinate in the second coordinate system, calculates described first
Coordinate is converted to four parameters of the second coordinate.
In one embodiment, it also performs the steps of when computer program is executed by processor and is joined according to the feature
Number determines the step of coordinate correction amount of the grid points in the grid pre-established, comprising: determines that the grid points are sat first
The first grid coordinate in mark system determines that the second grid of the grid points in the second coordinate system is sat according to four parameter
Mark；The coordinate correction amount of the grid points is determined according to the first grid coordinate and the second grid coordinate.
In one embodiment, also performed the steps of when computer program is executed by processor it is described according to
The step of conversion residual error for knowing a little determines the residual error reduction of the grid points, comprising: determine the known point and the grid
The distance of point；According to distance described in the conversion residual sum of the known point, the residual of the grid points is determined by distance weighting method
Poor reduction.
In one embodiment, it is also performed the steps of when computer program is executed by processor described according to the seat
Mark reduction and residual error reduction the step of determining grid reduction, comprising: according to the coordinate correction amount and described residual
The sum of poor reduction obtains the grid reduction.
In one embodiment, it is also performed the steps of in the transformation model when computer program is executed by processor
It include the grid reduction of multiple grid points；It is described that the lattice are determined according to the coordinate correction amount and the residual error reduction
The grid reduction of site, after the step of establishing transformation model according to the grid reduction, further includes: from the modulus of conversion
The grid reduction of target mesh point corresponding with the point to be converted is determined in type；Changed according to the grid of the target mesh point
Positive quantity determines the reduction of the point to be converted by bilinear interpolation method；According to described to be converted o'clock in the first coordinate system
Coordinate and the reduction of the point to be converted determine coordinate of the point to be converted in second coordinate system.
In one embodiment, it is also performed the steps of when computer program is executed by processor described according to known point
Before determining the step of first coordinate system is converted to the characteristic parameter of the second coordinate system, further includes: determine that the grid points are pre-
If the region to be analyzed in radius, determine that there is first coordinate system and the second coordinate system from the region to be analyzed
Coordinate known point.
It will appreciated by the skilled person that realizing all or part of the process in above-described embodiment method, being can
It is completed with instructing relevant hardware by computer program, the program can be stored in a computer-readable storage and be situated between
In matter, sells or use as independent product.The more specific example (non-exhaustive list) of computer-readable medium includes
Below: there is the electrical connection section (electronic device) of one or more wirings, portable computer diskette box (magnetic device), arbitrary access
Memory (RAM), read-only memory (ROM), erasable edit read-only storage (EPROM or flash memory), optical fiber dress
It sets and portable optic disk read-only storage (CDROM).In addition, computer-readable medium, which can even is that, to be printed on it
The paper of described program or other suitable media, because can be for example by carrying out optical scanner to paper or other media, then
It edited, interpreted or is handled when necessary with other suitable methods electronically to obtain described program, then by it
Storage is in computer storage.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
The term " includes " of the embodiment of the present invention and " having " and their any deformations, it is intended that cover non-exclusive
Include.Such as contain series of steps or the process, method, system, product or equipment of (module) unit are not limited to
The step of listing or unit, but optionally further comprising the step of not listing or unit, or optionally further comprising for these
The intrinsic other step or units of process, method, product or equipment.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, should not be understood as to the invention patent range
Limitation.It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the premise,
Various modifications and improvements can be made, and these are all within the scope of protection of the present invention.Therefore, the scope of protection of the patent of the present invention
It should be determined by the appended claims.
Claims (10)
1. a kind of method of coordinate conversion, which comprises the following steps:
The characteristic parameter that the first coordinate system is converted to the second coordinate system is determined according to known point；The known point has described the
The coordinate of the coordinate of one coordinate system and the second coordinate system；
According to the seat of the grid points in the grid that the characteristic parameter determines the conversion residual error of the known point and pre-establishes
Mark reduction；The residual error reduction of the grid points is determined according to the conversion residual error of the known point；
The grid reduction that the grid points are determined according to the coordinate correction amount and the residual error reduction, according to the grid
Reduction establishes transformation model；The transformation model is used to determine that the point to be converted in the first coordinate system to be transformed into described second and sits
Coordinate in mark system.
2. the method for coordinate conversion according to claim 1, which is characterized in that the characteristic parameter includes four parameters；
It is described that the step of first coordinate system is converted to the characteristic parameter of the second coordinate system is determined according to known point, comprising:
Determine first coordinate of the known point in the first coordinate system and the second coordinate in the second coordinate system, calculating will be described
First coordinate is converted to four parameters of the second coordinate.
3. the method for coordinate conversion according to claim 2, which is characterized in that built in advance according to characteristic parameter determination
The step of coordinate correction amount of grid points in vertical grid, comprising:
It determines first grid coordinate of the grid points in the first coordinate system, determines that the grid points exist according to four parameter
The second grid coordinate in second coordinate system；
The coordinate correction amount of the grid points is determined according to the first grid coordinate and the second grid coordinate.
4. the method for coordinate conversion according to claim 1, which is characterized in that the conversion according to the known point is residual
Difference determines the step of residual error reduction of the grid points, comprising:
Determine the known point at a distance from the grid points；According to distance described in the conversion residual sum of the known point, pass through
Distance weighting method determines the residual error reduction of the grid points.
5. the method for coordinate conversion according to claim 1, which is characterized in that described according to the coordinate correction amount and institute
State the step of residual error reduction determines grid reduction, comprising:
The grid reduction is obtained according to the sum of the coordinate correction amount and the residual error reduction.
6. the method for coordinate conversion according to claim 1, which is characterized in that include multiple lattice in the transformation model
The grid reduction of site；
The grid reduction that the grid points are determined according to the coordinate correction amount and the residual error reduction, according to described
After the step of grid reduction establishes transformation model, further includes:
The grid reduction of target mesh point corresponding with the point to be converted is determined from the transformation model；
According to the grid reduction of the target mesh point, the reduction of the point to be converted is determined by bilinear interpolation method；
It is determined according to the reduction of the described to be converted o'clock coordinate in the first coordinate system and the point to be converted described wait turn
Change the coordinate a little in second coordinate system.
7. the method for coordinate conversion according to any one of claims 1 to 6, which is characterized in that described true according to known point
Before fixed the step of first coordinate system is converted to the characteristic parameter of the second coordinate system, further includes:
It determines the region to be analyzed within the scope of the grid points pre-set radius, determines there is described the from the region to be analyzed
The known point of the coordinate of one coordinate system and the second coordinate system.
8. a kind of device of coordinate conversion characterized by comprising
Parameter determination module, for determining the characteristic parameter that the first coordinate system is converted to the second coordinate system according to known point；Institute
State the coordinate of coordinate and second coordinate system of the known point with first coordinate system；
Reduction determining module, for determining the conversion residual error of the known point according to the characteristic parameter and pre-establishing
The coordinate correction amount of grid points in grid；The residual error correction of the grid points is determined according to the conversion residual error of the known point
Amount；
And model building module, for determining the grid points according to the coordinate correction amount and the residual error reduction
Grid reduction establishes transformation model；The point to be converted that the transformation model is used to determine in the first coordinate system is transformed into described the
Coordinate in two coordinate systems.
9. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor is realized described in any one of claim 1 to 7 when executing the computer program
Method the step of.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
The step of claim 1 to 7 described in any item methods are realized when being executed by processor.
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