CN109947877B - Method and system for improving map positioning precision of GIS mobile terminal - Google Patents
Method and system for improving map positioning precision of GIS mobile terminal Download PDFInfo
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Abstract
The invention relates to a method and a system for improving the map positioning precision of a GIS (geographic information System) mobile terminal, on one hand, area grids are divided by a certain partitioning method in the geographic area covered by a project map, and different area grids use different seven parameters, so that the error influence caused by independently solving the non-secret-related seven parameters is weakened; on the other hand, after the seven-parameter conversion, the coordinate secondary correction is carried out, and the coordinate conversion can reach higher precision within the range of the target area by the combined action of the two steps. On the premise of not depending on high-level confidential data, the conversion precision of converting the GPS coordinates into national Saian 80, Beijing 54 and local independent coordinate systems by using non-confidential seven parameters is improved, the conversion error is usually higher than 30 meters, and the method can control the error within 2 meters and enable the error to have linearity.
Description
Technical Field
The invention relates to the technical field of geodetic surveying, digital maps and geographic information, in particular to a method and a system for improving the positioning accuracy of GIS mobile terminal equipment in a map.
Background
At present, an information system based on a GIS technology plays an increasingly important role in land resource management, and particularly, a mobile terminal system of equipment such as a smart phone, a tablet personal computer and the like, which takes a digital map coordinate frame and GPS real-time positioning information as a core, plays an efficient and visual office role in the business fields of state satellite law enforcement, land change investigation and the like.
However, due to the national basic geographic data coordinate system, the system map generally needs to adopt the reference center coordinate system such as the west ampere 80, the beijing 54 and the like, which relates to the problem of converting the GPS positioning coordinate into the non-WGS 84 map coordinate system. As is readily known in the art, a boolean sand model seven-parameter conversion method is generally adopted, and since seven parameters are mapping results with absolute secret levels specified in the rules of national secret range of mapping management work, the seven parameters are generally difficult to obtain, the seven parameters are usually calculated through some known point pairs. And generally, due to the reason that the geodetic high coordinate component of the point position in the coordinates of the Xian 80 or the Beijing 54 is difficult to obtain, or the measurement cost is high, the secret-related level is high and the like, the seven-parameter calculation is inaccurate due to the lack of the coordinate component, so that the coordinate conversion error is caused, the error can reach more than 50 meters, and the application limitation is brought.
Disclosure of Invention
The invention provides a method and a system for improving the map positioning precision of a GIS mobile terminal, aiming at the technical problems in the prior art, and under the condition of not depending on seven secret-related parameters, the method and the system are used for converting GPS coordinates acquired by equipment into map coordinates of national Xian 80, Beijing 54 and an independent local coordinate system in GIS mobile application, particularly in the application of the territorial informatization industry, and improving the conversion precision, thereby realizing the accurate identification of the current position on the map.
The technical scheme for solving the technical problems is as follows:
on one hand, the invention provides a method for improving the map positioning precision of a GIS mobile terminal, which comprises the following steps:
dividing the target area into a plurality of sub-area grids A according to the basic topographic data1～AnRespectively obtaining seven parameters of the transformation from the WGS84 coordinate system coordinate of each subarea grid to the target map coordinate system coordinate;
for sub-region grid AiRespectively selecting a plurality of coordinate points Pi1～PimCalculating the average error increment between the WGS84 coordinate system and the target map coordinate system by using the seven conversion parameters of each subarea grid;
respectively matching the GPS coordinates C obtained by the mobile equipment with each subarea grid A1～AnPerforming spatial superposition analysis, judging a subregion to which the GPS coordinate C belongs, and calculating a conversion result by using a conversion seven parameter and an average error increment of the subregion;
the location of the conversion result of the GPS coordinate C is identified on a target map of the mobile device.
Further, the target area is divided into a plurality of sub-area grids A according to the basic terrain data1～AnSeparately, the WGS84 coordinate system coordinate of each sub-area grid is obtained to the target mapSeven parameters of the transformation of the coordinate system comprise:
according to the basic topographic data, the geographic space range covered by the target area is divided into a plurality of subarea grids A1～AnEach grid is in a topological adjacency relation;
for sub-region grid AiSelecting a plurality of coordinate points P 'which are uniformly distributed'i1～P′iNWherein i is more than or equal to 1 and less than or equal to N, and N is more than or equal to 3;
calculating sub-region grid A by least square methodiBy a conversion of seven parameters Fi。
Further, using the least square method, a sub-area grid A is calculatediBy a conversion of seven parameters FiThen, the method further comprises the following steps: for the calculated conversion seven parameters FiChecking if the seven parameters F pass the conversioniDetermining the seven parameters F of the conversion if the error value epsilon of the result obtained by the conversion is less than the preset threshold valueiAnd the grid AiMatching, otherwise, reselecting a plurality of uniformly distributed coordinate points P'i1～P′iNComputing a sub-area grid A using a least squares methodiBy a conversion of seven parameters FiAnd until the conversion error value is smaller than the preset threshold value.
Further, the plurality of coordinate points Pi1～PimAnd means: for sub-region grid AiSelecting a plurality of coordinate points P which are uniformly distributedi1～PimSaid coordinate point Pi1～PimAnd the coordinate point P'i1～P′iNAll the coordinate points are not overlapped, and the coordinate point P is obtained in an actual measurement or map collection modeijCoordinates in WGS84 coordinate System
And coordinates in the target map coordinate system
Further, the calculating of the average error increment between the WGS84 coordinate system and the target map coordinate system by using the seven transformed parameters of the grids of the respective sub-regions includes:
for sub-region grid AiIn the selected coordinate point PijCalculating the seven-parameter conversion result
And calculating the error
The average error increment apiIs calculated by the following formula.
On the other hand, the invention also provides a system for improving the map positioning precision of the GIS mobile terminal, which comprises the following steps:
a parameter calculation module for dividing the target area into a plurality of sub-area grids A according to the basic topographic data1～AnRespectively obtaining seven parameters of the transformation from the WGS84 coordinate system coordinate of each subarea grid to the target map coordinate system coordinate;
an error calculation module for calculating the error in the sub-region grid AiRespectively selecting a plurality of coordinate points Pi1～PimCalculating the average error increment between the WGS84 coordinate system and the target map coordinate system by using the seven conversion parameters of each subarea grid;
a coordinate conversion module for respectively connecting the GPS coordinate C obtained by the mobile equipment with each sub-area grid A1～AnPerforming spatial superposition analysis, judging a subregion to which the GPS coordinate C belongs, and calculating a conversion result by using a conversion seven parameter and an average error increment of the subregion;
and the result output module is used for identifying the position of the conversion result of the GPS coordinate C on a target map of the mobile equipment.
Further, the parameter calculation module includes:
the region division module is used for covering the geographic space range of the target region according to the basic topographic dataDividing the enclosure into a plurality of subarea grids A1～AnEach grid is in a topological adjacency relation;
coordinate point selection module for sub-region grid AiSelecting a plurality of coordinate points P 'which are uniformly distributed'i1～P′iNWherein i is more than or equal to 1 and less than or equal to N, and N is more than or equal to 3;
a calculation module for calculating the sub-area grid A by using the least square methodiBy a conversion of seven parameters Fi。
Further, the parameter calculation module further includes:
a parameter checking module for calculating the obtained converted seven parameters FiChecking if the seven parameters F pass the conversioniDetermining the seven parameters F of the conversion if the error value epsilon of the result obtained by the conversion is less than the preset threshold valueiAnd the grid AiMatching, otherwise, reselecting a plurality of uniformly distributed coordinate points P'i1～P′iNComputing a sub-area grid A using a least squares methodiBy a conversion of seven parameters FiAnd until the conversion error value is smaller than the preset threshold value.
Further, the error calculation module selects a plurality of coordinate points Pi1～PimThe method comprises the following steps:
for sub-region grid AiSelecting a plurality of coordinate points P which are uniformly distributedi1～PimSaid coordinate point Pi1～PimAnd the coordinate point P'i1～P′iNAll the coordinate points are not overlapped, and the coordinate point P is obtained in an actual measurement or map collection modeijCoordinates in WGS84 coordinate System
And coordinates in the target map coordinate system
Further, the coordinate conversion module is specifically configured to:
in sub-area grid AiRespectively selecting a plurality of coordinate pointsPi1～Pim，
For sub-region grid AiIn the selected coordinate point PijCalculating the seven-parameter conversion result
And calculating the error
The average error increment apiIs calculated by the following formula.
The invention has the beneficial effects that: on the premise of not depending on high-level confidential data, the conversion precision of converting the GPS coordinates into national Saian 80, Beijing 54 and a local independent coordinate system by using non-confidential seven parameters is improved, the conversion error is usually higher than 30 meters, and the method can control the error within 2 meters and ensure that the error has linearity.
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FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a block diagram of the system of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
The invention provides a method and a system for improving the map positioning precision of a GIS mobile terminal aiming at the technical problems described in the background technology, on one hand, the regional grids are divided by a certain partitioning method in the geographic region covered by a target map, and different regional grids use different seven parameters, so that the error influence caused by independently solving the non-secret-involved seven parameters is weakened; on the other hand, after the seven-parameter conversion, the secondary correction of the coordinates is carried out, and the coordinate conversion of the mobile equipment can reach higher precision in the whole project implementation range through the combined action of the two steps.
Specifically, as shown in fig. 1, a method for improving map positioning accuracy of a GIS mobile terminal includes the following steps:
step 100, according to the DEM, administrative regions and other basic topographic data, the geographic space range covered by the target region is divided into a plurality of sub-region grids A1～AnEach grid is in a topological adjacency relation; the grid should satisfy the following conditions as much as possible: in the same grid, the change of the landform elevation is small, and the whole outline of the grid is prevented from being long and narrow.
Step 200, for sub-region grid AiSelecting a plurality of coordinate points P 'which are uniformly distributed'i1～P′iNWherein i is more than or equal to 1 and less than or equal to N, and N is more than or equal to 3; the WGS84 coordinates and the coordinates of a target map coordinate system (such as national sienna 80, beijing 54, etc.) are obtained by field measurement or map collection, and the height of the target coordinate system is not necessary. Calculating sub-region grid A by least square methodiBy a conversion of seven parameters Fi；
Step 300, converting the obtained conversion seven parameters FiChecking if the seven parameters F pass the conversioniDetermining the seven parameters F of the conversion if the error value epsilon of the result obtained by the conversion is less than the preset threshold valueiAnd the grid AiOtherwise, step 200 is executed again until the conversion error value is smaller than the preset threshold.
Step 400, for sub-region grid AiRespectively selecting a plurality of coordinate points Pi1～PimA plurality of coordinate points P as described hereini1～PimThe method comprises the following steps: for sub-region grid AiSelecting a plurality of coordinate points P which are uniformly distributedi1～PimSaid coordinate point Pi1～PimAnd the coordinate point P'i1～P′iNAll the coordinate points are not overlapped, and the coordinate point P is obtained in an actual measurement or map collection modeijCoordinates in WGS84 coordinate System
And coordinates in the target map coordinate system
Step 500, for sub-region grid AiIn the selected coordinate point PijCalculating the seven-parameter conversion result
And calculating the error
The average error increment apiIs calculated by the following formula.
Step 600, respectively associating the GPS coordinates C obtained by the mobile device with each sub-area grid A1～AnPerforming space superposition analysis, and judging the sub-area grid A to which the GPS coordinate C belongsiUsing the conversion seven parameters F of the sub-regioniAnd calculating the conversion result R, R ═ F by average error incrementi(C)-ΔPi；
Step 700, drawing the position of the conversion result R of the GPS coordinate C on a target map of the mobile device, identifying the current geographic position of the tablet and the smartphone, or storing the conversion result.
Based on the above method, the present invention further provides a system for improving the map positioning accuracy of a GIS mobile terminal, as shown in fig. 2, including:
a parameter calculation module for dividing the target area into a plurality of sub-area grids A according to the basic topographic data1～AnRespectively obtaining seven parameters of the transformation from the WGS84 coordinate system coordinate of each subarea grid to the target map coordinate system coordinate;
an error calculation module for calculating the error in the sub-region grid AiRespectively selecting a plurality of coordinate points Pi1～PimCalculating the average error between the WGS84 coordinate system and the target map coordinate system by using the seven transformed parameters of each subarea gridIncrement;
a coordinate conversion module for respectively connecting the GPS coordinate C obtained by the mobile equipment with each sub-area grid A1～AnPerforming spatial superposition analysis, judging a subregion to which the GPS coordinate C belongs, and calculating a conversion result by using a conversion seven parameter and an average error increment of the subregion;
and the result output module is used for identifying the position of the conversion result of the GPS coordinate C on a target map of the mobile equipment.
Further, the parameter calculation module includes:
the region division module is used for carrying out region division on the geographic space range covered by the target region according to the basic topographic data and dividing the geographic space range into a plurality of sub-region grids A1～AnEach grid is in a topological adjacency relation;
coordinate point selection module for sub-region grid AiSelecting a plurality of coordinate points P 'which are uniformly distributed'i1～P′iNWherein i is more than or equal to 1 and less than or equal to N, and N is more than or equal to 3;
a calculation module for calculating the sub-area grid A by using the least square methodiBy a conversion of seven parameters Fi。
Further, the parameter calculation module further includes:
a parameter checking module for calculating the obtained converted seven parameters FiChecking if the seven parameters F pass the conversioniDetermining the seven parameters F of the conversion if the error value epsilon of the result obtained by the conversion is less than the preset threshold valueiAnd the grid AiMatching, otherwise, reselecting a plurality of uniformly distributed coordinate points P'i1～P′iNComputing a sub-area grid A using a least squares methodiBy a conversion of seven parameters FiAnd until the conversion error value is smaller than the preset threshold value.
Under the condition of not depending on seven secret-related parameters, the method is used for converting the GPS coordinates acquired by equipment into map coordinates of national Xian 80, Beijing 54 and independent local coordinate systems in GIS mobile application, particularly in the application of the land information industry, and improving the conversion precision, so that the current position is accurately identified on the map, the conversion error is usually higher than 30 meters, the error can be controlled within 2 meters, and the error has linearity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A method for improving the map positioning precision of a GIS mobile terminal is characterized by comprising the following steps:
according to the basic topographic data, the geographic space range covered by the target area is divided into a plurality of subarea grids A1～AnEach grid is in a topological adjacency relation; for sub-region grid AiSelecting a plurality of coordinate points P 'which are uniformly distributed'i1～P'iNWherein i is more than or equal to 1 and less than or equal to N, N is more than or equal to 3, and calculating the sub-area grid A by using a least square methodiSeven parameters F for the transformation of WGS84 coordinate system coordinates to target map coordinate system coordinatesi；
For sub-region grid AiRespectively selecting a plurality of coordinate points P which are uniformly distributedi1～PimCalculating the average error increment between the WGS84 coordinate system and the target map coordinate system by using the seven conversion parameters of each subarea grid; the coordinate point Pi1～PimAnd coordinate point P'i1～P'iNAll the coordinate points are not overlapped, and the coordinate point P is obtained in an actual measurement or map collection modeijCoordinates in WGS84 coordinate System
And coordinates in the target map coordinate system
Respectively matching the GPS coordinates C obtained by the mobile equipment with each subarea grid A1～AnPerforming space superposition analysis to judge the subzone of the GPS coordinate CThe domain calculates a conversion result by using the seven conversion parameters and the average error increment of the sub-region;
the location of the conversion result of the GPS coordinate C is identified on a target map of the mobile device.
2. The method of claim 1, wherein the sub-area grid A is calculated by using least square methodiBy a conversion of seven parameters FiThen, the method further comprises the following steps: for the calculated conversion seven parameters FiChecking if the seven parameters F pass the conversioniDetermining the seven parameters F of the conversion if the error value epsilon of the result obtained by the conversion is less than the preset threshold valueiAnd the grid AiMatching, otherwise, reselecting a plurality of uniformly distributed coordinate points P'i1～P'iNComputing a sub-area grid A using a least squares methodiBy a conversion of seven parameters FiAnd until the conversion error value is smaller than the preset threshold value.
3. The method of claim 1, wherein the calculating the average error increment between the WGS84 coordinate system and the target map coordinate system by using the seven transformed parameters of each sub-area grid comprises:
for sub-region grid AiIn the selected coordinate point PijCalculating the seven-parameter conversion result
And calculating the error
The average error increment apiIs calculated by the following formula:
4. the utility model provides a system for improve GIS mobile terminal map positioning accuracy which characterized in that includes:
the parameter calculation module is used for carrying out region division on the geographic space range covered by the target region according to the basic topographic data and dividing the geographic space range into a plurality of sub-region grids A1～AnEach grid is in a topological adjacency relation; for sub-region grid AiSelecting a plurality of coordinate points P 'which are uniformly distributed'i1～P'iNWherein i is more than or equal to 1 and less than or equal to N, N is more than or equal to 3, and calculating the sub-area grid A by using a least square methodiSeven parameters F for the transformation of WGS84 coordinate system coordinates to target map coordinate system coordinatesi；
An error calculation module for calculating an error for the sub-region grid AiRespectively selecting a plurality of coordinate points P which are uniformly distributedi1～PimCalculating the average error increment between the WGS84 coordinate system and the target map coordinate system by using the seven conversion parameters of each subarea grid; the coordinate point Pi1～PimAnd coordinate point P'i1～P'iNAll the coordinate points are not overlapped, and the coordinate point P is obtained in an actual measurement or map collection modeijCoordinates in WGS84 coordinate System
And coordinates in the target map coordinate system
A coordinate conversion module for respectively connecting the GPS coordinate C obtained by the mobile equipment with each sub-area grid A1～AnPerforming spatial superposition analysis, judging a subregion to which the GPS coordinate C belongs, and calculating a conversion result by using a conversion seven parameter and an average error increment of the subregion;
and the result output module is used for identifying the position of the conversion result of the GPS coordinate C on a target map of the mobile equipment.
5. The system of claim 4, wherein the parameter calculating module further comprises:
a parameter checking module for calculating the obtained converted seven parameters FiChecking if the seven parameters F pass the conversioniDetermining the seven parameters F of the conversion if the error value epsilon of the result obtained by the conversion is less than the preset threshold valueiAnd the grid AiMatching, otherwise, reselecting a plurality of uniformly distributed coordinate points P'i1～P'iNComputing a sub-area grid A using a least squares methodiBy a conversion of seven parameters FiAnd until the conversion error value is smaller than the preset threshold value.
6. The system of claim 4, wherein the coordinate transformation module is specifically configured to:
in sub-area grid AiRespectively selecting a plurality of coordinate points Pi1～Pim，
For sub-region grid AiIn the selected coordinate point PijCalculating the seven-parameter conversion result
And calculating the error
The average error increment apiIs calculated by the following formula:
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