CN106202000B - Seven-parameter transformation method between national three-dimensional system of coordinate and anywhere plane coordinate system - Google Patents
Seven-parameter transformation method between national three-dimensional system of coordinate and anywhere plane coordinate system Download PDFInfo
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Abstract
本发明公开了一种国家三维坐标系与任意地方平面坐标系间七参数转换方法，本发明针对现有算法无法直接获取高精度单一的七参数转换参数，进而无法基于CORS测量数据实时获取地方坐标系成果的问题；提出了一种附加加常数的七参数转换模型。该方法通过一系列数据处理方法：附加加常数极大地降低了投影变形的影响，通过三参数转换模型降低了大地高对求参精度的影响等，大大地改善了转换参数的精度，并且方法符合目前市场上测量手簿只能接受单一四/七参数输入的要求，基于CORS网络测量得到的国家坐标系成果，可以实时转换成地方坐标系成果，这有利于拓展省市级CORS在测量实践过程中的应用空间。
The invention discloses a seven-parameter conversion method between a national three-dimensional coordinate system and an arbitrary local plane coordinate system. The invention cannot directly obtain a high-precision single seven-parameter conversion parameter with the existing algorithm, and further cannot obtain local coordinates in real time based on CORS measurement data. A seven-parameter transformation model with additional additive constants is proposed. This method uses a series of data processing methods: the addition of additive constants greatly reduces the influence of projection deformation, and the three-parameter transformation model reduces the influence of geodetic height on the accuracy of parameters, etc., which greatly improves the accuracy of transformation parameters, and the method conforms to At present, the survey handbook on the market can only accept the requirements of a single four/seven parameter input. The national coordinate system results obtained based on CORS network measurement can be converted into local coordinate system results in real time, which is conducive to expanding the measurement practice of provincial and municipal CORS. application space in the process.
Description
Technical field
The invention belongs to technical field of geographic information, it is related to a kind of national three-dimensional system of coordinate and anywhere plane coordinate system
Between seven-parameter transformation method, more particularly to a kind of new high-precision country three-dimensional system of coordinate and anywhere between plane coordinate system
Seven-parameter transformation acquiring method.
Background technique
National Geodetic Datum and local reference data are confidential datas, and each province and city area is in order to protect basic parameter
It is close, when establishing local coordinate system, on the basis of national coordinate system, mostly carry out the projective transformation of central meridian, portion
Region-by-region has further carried out four-parameter conversion (irregular translation, rotation, scaling etc.) to coordinate after transformation, this makes ground
There is more complicated transformational relations between square coordinate system and national coordinate system.And measurement hand currently used in the market
Book can only receive single four/seven parameters input, this makes user ginseng method can not be asked to seek reliably converting using traditional
Parameter, so that coordinates of local systems can not be obtained in real time.Under the background that Provincial CORS is covered comprehensively, this is very not
It is promoted and applied conducive to provincial CORS in area.
Summary of the invention
In order to solve the above-mentioned technical problem, the invention proposes a kind of new high-precision country three-dimensional system of coordinate and arbitrarily
Seven-parameter transformation acquiring method between square plane coordinate system.
The technical scheme adopted by the invention is that: it is a kind of country three-dimensional system of coordinate and anywhere between plane coordinate system seven ginseng
Number conversion method, which comprises the following steps:
Step 1: unified country's three-dimensional system of coordinate and local plane coordinate system central meridian are corrected using one group of additive constant
Local coordinate system achievement；
Step 2: weakening influence of the geodetic height direction to two-dimensional assemblage precision using three Parameter Switch models；
Step 3: seeking correcting the conversion between local plane coordinate system and national three-dimensional system of coordinate using seven parameter models
Relationship；
Step 4: seven parameters of setting and additive constant obtain local coordinate system achievement based on CORS network in real time.
Preferably, the specific implementation of step 1 includes following sub-step:
Step 1.1: by the coordinate series (x of national three-dimensional system of coordinate2000,y2000) pass through projective transformation, by original country
Three-dimensional system of coordinate central meridian L02000It is transformed into local plane coordinate system central meridian L0dlUnder, the state after being corrected
Family three-dimensional system of coordinate coordinate (xgz2000,ygz2000)；
Step 1.2: by the national three-dimensional system of coordinate coordinate (x after correctiongz2000,ygz2000) with corresponding local plane coordinates
It is coordinate (xdl,ydl) ask poor, obtain the difference in the direction x and the direction y；
Step 1.3: seeking average value △ x, △ y, △ x, the △ y of both direction difference respectively as the direction x, y plus normal
Number；
Step 1.4: it is flat that average value △ x, △ y being added separately to the place system after being corrected on Local coordinates plane system
Areal coordinate (xgzdl,ydgzl)。
Preferably, the specific implementation of step 2 includes following sub-step:
Step 2.1: being plane coordinates (x by the place after correctiongzdl,ydgzl) it is converted into longitude and latitude (Bgzdl, Lgzdl)；
Step 2.2: by national three-dimensional system of coordinate (x2000,y2000) it is converted into longitude and latitude (B2000, L2000)；
Step 2.3: obtaining national three-dimensional system of coordinate geodetic height H2000；
Step 2.4: by H2000Instead of local coordinate system geodetic height Hdl, then seek turning between Two coordinate system using three parameters
Relationship is changed, and local coordinate system geodetic height H is updated according to conversion parameterdl。
Preferably, the specific implementation process of step 3 is: by (Bgzdl, Lgzdl) with update after local plane coordinate system
Geodetic height HdlAs target-based coordinate system (Bgzdl, Lgzdl, Hdl), by (B2000, L2000, H2000) it is used as source coordinate system；Seek two coordinates
Transformational relation between system obtains last seven parameter of conversion.
Preferably, the specific implementation process of step 4 is: creating task on handbook, projection is arranged in task attribute
Parameter, i.e., seven parameter of conversion obtained in step 3, and handbook be arranged corresponding additive constant (on handbook default setting plus it is normal
Number is north 0.000, at this moment corresponding additive constant can be added on this default value by east 500000.000)；Eventually by single
The method that seven parameters add additive constant obtains local plane coordinate system in real time.
Compared with the existing method for directly seeking seven parameters, the advantageous effect of present invention is that: it is directed to existing calculation
Method can not directly acquire the single seven-parameter transformation parameter of high-precision, and then can not obtain in real time place based on CORS measurement data
The problem of coordinate system achievement, proposes a kind of seven-parameter transformation model of additional additive constant.This method is by adding additive constant pole
The earth reduces the influence of distortion of projection, reduces influence etc. of the geodetic height to ginseng precision is sought by three Parameter Switch models, greatly
The earth improves the precision of conversion parameter, and method meets measurement handbook currently on the market can only receive single four/seven parameter
The requirement of input can be converted into local coordinate system achievement based on the national coordinate system achievement that CORS network measure obtains in real time,
This is conducive to expand application space of the provincial, and municipal level CORS in measurement practice process.
Detailed description of the invention
Fig. 1: the flow chart of the embodiment of the present invention.
Specific embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, with reference to the accompanying drawings and embodiments to this hair
It is bright to be described in further detail, it should be understood that implementation example described herein is merely to illustrate and explain the present invention, not
For limiting the present invention.
The present invention is insufficient for available data processing method, proposes the new high-precision country three-dimensional system of coordinate of one kind and appoints
Seven-parameter transformation acquiring method between the local plane coordinate system of meaning.Pass through unified national coordinate system and local coordinate system center first
Meridian greatly weakens the influence that distortion of projection seeks conversion parameter, also with three Parameter Switch models, reduces
Local coordinate system does not have the influence that geodetic height this defect seeks precision to conversion parameter, finally utilizes seven unified parameter moulds
Type seeks the transformational relation between national coordinate system and local coordinate system.In actual use, the present invention passes through seven ginsengs first
The national coordinate system result transformation that number real-time measurement obtains is then to deduct the influence of additive constant to place, final to obtain in real time
The local coordinate system achievement that user needs.
Referring to Fig.1, it (is data instance, local coordinate system achievement with somewhere place that the present embodiment, which combines specific measured data,
Data have been subjected to processing) further explain is made to the present invention.
Local plane coordinate system and national three-dimensional system of coordinate achievement are obtained first, and obtain each coordinate system central meridian letter
Breath, as shown in table 1,
The national three-dimensional system of coordinate of table 1 and local plane coordinate system achievement
Method point following steps of the invention carry out, and specific steps are described as follows:
Step 1: national three-dimensional system of coordinate and local plane coordinate system central meridian are unified, and reducing distortion of projection influences.
First by national three-dimensional system of coordinate (with (x2000,y2000) for) coordinate series is by projective transformation, by original state
Family three-dimensional system of coordinate central meridian (L02000) it is transformed into local plane coordinate system central meridian (L0dl) under, it obtains correcting it
Country three afterwards maintains coordinate (xgz2000,ygz2000).By this coordinate and corresponding local plane coordinate system coordinate (xdl,ydl) ask
Difference obtains the difference in the direction x and the direction y, and seek respectively both direction difference average value △ x, △ y (△ x, △ y as x,
The additive constant in the direction y).Then this average value is added to local plane coordinates and fastens local plane system coordinate after being corrected
(xgzdl,ydgzl)。
The present embodiment projects to BLH under national three-dimensional system of coordinate under local plane coordinate system central meridian, obtains new
National three-dimensional system of coordinate is corrected under coordinate system as a result, the results are shown in Table 2.By the coordinate acquired and corresponding local plane coordinates
System asks poor, and is averaging respectively in the direction x, y, obtains the additive constant in the direction x, y.
State's family coordinate and additive constant (unit: m) after the projection of table 2
Step 2: further weakening influence of the geodetic height direction to two-dimensional assemblage precision using three parameter model.
By the local plane system coordinate (x after correctiongzdl,ydgzl) it is converted into longitude and latitude (Bgzdl, Lgzdl)；Simultaneously by state
Family three maintains coordinate (x2000,y2000) it is converted into longitude and latitude (B2000, L2000)；It is big to obtain original national three-dimensional system of coordinate simultaneously
The high H in ground2000, first by H2000Instead of local plane coordinate system geodetic height Hdl, then sought between Two coordinate system using three parameters
Transformational relation, and local plane coordinate system geodetic height H is updated according to conversion parameterdl。
In the additive constant correction to coordinates of local systems that the present embodiment will acquire, and it is converted into BLH.Acquired results such as table
Shown in 3,
Local plane system coordinate and national three-dimensional coordinate BLH after the correction of table 3
Local plane coordinate system geodetic height is directly replaced with country's three-dimensional system of coordinate geodetic height in table 3.After correction
Local plane coordinates and primitive state three-dimensional system of coordinate coordinate seek three parameters, further weaken geodetic height inaccuracy to parameter essence
The influence of degree, the results are shown in Table 4.In the present embodiment, local plane coordinate system and national three-dimensional system of coordinate use unified ellipsoid,
So the earth High variation is little, but this step work is also in the case that local plane coordinate system is different with country's three-dimensional system of coordinate
It is meaningful.
The corrected local plane coordinate system coordinate of 4 three parameter of table
Step 3: seeking correcting the conversion between local plane coordinate system and national three-dimensional system of coordinate using seven parameter models
Relationship；
By (Bgzdl, Lgzdl) with update after local plane coordinate system geodetic height HdlAs target-based coordinate system (Bgzdl,
Lgzdl, Hdl), by (B2000, L2000, H2000) it is used as source coordinate system；The transformational relation between Two coordinate system is finally sought, is obtained most
Seven parameter of conversion afterwards；
Using result in table 4 and original national three-dimensional system of coordinate as a result, seeking conversion parameter.In actual use process
In, the national three-dimensional system of coordinate result of real-time measurement is transformed into local plane coordinate system using the conversion parameter sought is existing
Under, the local plane coordinate system of demand is finally then obtained in real time plus additive constant shown in table 2 as a result, for details, reference can be made to table 5,
BLH xy is converted in table to show.
Table 5 utilizes seven-parameter transformation result and conversion front and rear coordinate residual error (unit: m)
Step 4: seven parameters and additive constant is arranged in handbook, obtains local coordinate system achievement in real time based on CORS network.
Task is created on handbook, projective parameter is set in task attribute, i.e. seven parameter of conversion that acquires of previous step, and
In the additive constant that handbook setting responds, (in order to maintain secrecy to actual conversion parameter, seven parameters being arranged herein are by adding
Conversion parameter after close, encryption technology can be found in related existing patent), the additive constant of default setting is north 0.000 on handbook,
Corresponding additive constant △ x, △ y, at this moment can be added on this default value by east 500000.000.Eventually by single seven parameter
The method of additional additive constant realizes the purpose for obtaining local coordinate system in real time.
For the present invention by a series of measurement adjustment data processing means, the method for adding additive constant by single seven parameter is real
Show national three-dimensional geodetic datum coordinate system and anywhere the high-precision between coordinate system is converted, measures handbook meeting
Under the premise of only receiving single four/seven parameters input requirements, the demand of Local Independent Coordinate System is obtained in real time.
The present invention is the coordinate conversion acquiring method for having broad prospect of application in National primary standard course of modernization, is had
Help be widely applied regional coordinate system on the basis of existing provincial CORS network all-round construction is completed and obtain skill in real time
Art.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
It should be understood that the above-mentioned description for preferred embodiment is more detailed, can not therefore be considered to this
The limitation of invention patent protection range, those skilled in the art under the inspiration of the present invention, are not departing from power of the present invention
Benefit requires to make replacement or deformation under protected ambit, fall within the scope of protection of the present invention, this hair
It is bright range is claimed to be determined by the appended claims.
Claims (6)
1. a kind of country's three-dimensional system of coordinate and anywhere seven-parameter transformation method between plane coordinate system, which is characterized in that including
Following steps:
Step 1: unified country's three-dimensional system of coordinate and local plane coordinate system central meridian correct place using one group of additive constant
Coordinate system achievement；
Step 2: weakening influence of the geodetic height direction to two-dimensional assemblage precision using three Parameter Switch models；
Step 3: seeking correcting the transformational relation between local plane coordinate system and national three-dimensional system of coordinate using seven parameter models；
Step 4: seven parameters of setting and additive constant obtain local coordinate system achievement based on CORS network in real time.
2. country's three-dimensional system of coordinate according to claim 1 and anywhere seven-parameter transformation method between plane coordinate system,
It is characterized in that, the specific implementation of step 1 includes following sub-step:
Step 1.1: by the coordinate series (x of national three-dimensional system of coordinate2000,y2000) pass through projective transformation, it is three-dimensional by original country
Coordinate system central meridian L02000It is transformed into local plane coordinate system central meridian L0dlUnder, the country three after being corrected
Tie up coordinate system coordinate (xgz2000,ygz2000)；
Step 1.2: by the national three-dimensional system of coordinate coordinate (x after correctiongz2000,ygz2000) sat with corresponding local plane coordinate system
Mark (xdl,ydl) ask poor, obtain the difference in the direction x and the direction y；
Step 1.3: seeking the average value Δ x of both direction difference, Δ y, Δ x, additive constant of the Δ y as the direction x, y respectively；
Step 1.4: it is that plane is sat that average value Δ x, Δ y are added separately to the place after being corrected on Local coordinates plane system
Mark (xgzdl,ydgzl)。
3. country's three-dimensional system of coordinate according to claim 2 and anywhere seven-parameter transformation method between plane coordinate system,
It is characterized in that, the specific implementation of step 2 includes following sub-step:
Step 2.1: being plane coordinates (x by the place after correctiongzdl,ydgzl) it is converted into longitude and latitude (Bgzdl, Lgzdl)；
Step 2.2: by national three-dimensional system of coordinate (x2000,y2000) it is converted into longitude and latitude (B2000, L2000)；
Step 2.3: obtaining national three-dimensional system of coordinate geodetic height H2000；
Step 2.4: by H2000Instead of local coordinate system geodetic height Hdl, then seek converting between Two coordinate system using three parameters and close
System, and local coordinate system geodetic height H is updated according to conversion parameterdl。
4. country's three-dimensional system of coordinate according to claim 3 and anywhere seven-parameter transformation method between plane coordinate system,
It is characterized in that, the specific implementation process of step 3 is: by (Bgzdl, Lgzdl) with update after local plane coordinate system geodetic height
HdlAs target-based coordinate system (Bgzdl, Lgzdl, Hdl), by (B2000, L2000, H2000) it is used as source coordinate system；It seeks between Two coordinate system
Transformational relation, obtain last seven parameter of conversion.
5. country's three-dimensional system of coordinate according to claim 4 and anywhere seven-parameter transformation method between plane coordinate system,
It is characterized in that, the specific implementation process of step 4 is: creating task on handbook, projective parameter is arranged in task attribute, i.e.,
Seven parameter of conversion obtained in step 3, and corresponding additive constant is set in handbook；Additive constant is added eventually by single seven parameter
Method obtain local plane coordinate system in real time.
6. country's three-dimensional system of coordinate according to claim 5 and anywhere seven-parameter transformation method between plane coordinate system,
It is characterized by: described be arranged corresponding additive constant in handbook, it is that Δ x, Δ y are added to the additive constant of handbook default setting
On.
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| CN106845837B (en) * | 2017-01-23 | 2020-05-22 | 国网山东省电力公司电力科学研究院 | Monitoring system and method for environmentally sensitive areas of power transmission and transformation projects based on big data technology |
| CN107845060A (en) * | 2017-10-31 | 2018-03-27 | 广东中星电子有限公司 | Geographical position and corresponding image position coordinates conversion method and system |
| CN108731648B (en) * | 2018-03-15 | 2020-12-22 | 广州市城市规划勘测设计研究院 | 2000 Independent coordinate system parameter acquisition method, device and computer-readable storage medium |
| CN109947877B (en) * | 2018-07-25 | 2022-04-29 | 武汉光庭信息技术股份有限公司 | Method and system for improving map positioning precision of GIS mobile terminal |
| CN114001650B (en) * | 2021-09-16 | 2023-09-29 | 北京市测绘设计研究院 | Encryption method for conversion parameters of local coordinate system and arbitrary plane coordinate system |
| CN117708960B (en) * | 2024-02-04 | 2024-05-03 | 武汉大学 | Real-time conversion method, device, equipment and medium for plane coordinates and normal height |
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| CN103389080A (en) * | 2013-08-19 | 2013-11-13 | 重庆市地理信息中心 | Method for obtaining independent city coordinate system parameter based on geographic information application |
| CN104007457A (en) * | 2014-05-28 | 2014-08-27 | 武汉市测绘研究院 | Parameter-free real-time locating method based on CORS |
| CN105160197A (en) * | 2015-09-23 | 2015-12-16 | 湖北省基础地理信息中心 | Comprehensive geographical spatial data coordinate conversion method and system |
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| CN103389080A (en) * | 2013-08-19 | 2013-11-13 | 重庆市地理信息中心 | Method for obtaining independent city coordinate system parameter based on geographic information application |
| CN104007457A (en) * | 2014-05-28 | 2014-08-27 | 武汉市测绘研究院 | Parameter-free real-time locating method based on CORS |
| CN105160197A (en) * | 2015-09-23 | 2015-12-16 | 湖北省基础地理信息中心 | Comprehensive geographical spatial data coordinate conversion method and system |
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