CN103164516B - Electronic chart data conversion equipment and electronic chart data conversion method - Google Patents
Electronic chart data conversion equipment and electronic chart data conversion method Download PDFInfo
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- CN103164516B CN103164516B CN201310067220.1A CN201310067220A CN103164516B CN 103164516 B CN103164516 B CN 103164516B CN 201310067220 A CN201310067220 A CN 201310067220A CN 103164516 B CN103164516 B CN 103164516B
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Abstract
The invention provides a kind of electronic chart data conversion equipment and a kind of electronic chart data conversion method, wherein, electronic chart data conversion equipment includes：Data-reading unit, for reading the original electron chart data in source file；Date Conversion Unit, for being reconstructed and projection process to the original electron chart data；Electronic chart data after reconstruct and projection process is stored as the electronic chart data of user-defined format by data storage cell；Display unit, reads the electronic chart data of the user-defined format, and carries out sea chart drafting and display according to the electronic chart data for reading.Technology according to the present invention scheme, can reconstruct and project the two process simplifications for consuming CPU, and so as to reduce the use of CPU occupancy and memory space, on the basis of the precision at utmost ensureing chart data, sea chart shows that stable and display speed is fast.
Description
Technical field
The invention belongs to field of computer technology.In particular to a kind of electronic chart data conversion equipment and electronics
Chart data conversion method.
Background technology
While Paper Chart is played a great role in navigation, its information is single, it is not portable the shortcomings of also show that
Come.Electronic chart compensate for the deficiency of Paper Chart to a certain extent.
The development of electronic chart substantially experienced 3 stages：
(1) the reprography product stage of Paper Chart
People after digitized processing, are stored in global Paper Chart on disk, then by display device
With mark and draw instrument, carry out plotting as on the Paper Chart.
(2) the functions expanding stage
By the use of digitized sea chart, it has been found that it has many potential functions, shows such as on electronic chart
Accommodation, carries out course line, voyage plan design, shows the speed of a ship or plane, course etc..Then it is various to guarantee navigation safety, improve operation efficiency
Functional development define main flow.
(3) sail information system stages
This stage is mainly characterized by electronic chart as the core of sail information, is combined the exploitation of formula, integrated form
Research, steps ship's navigation automation and has gone up new step.In this stage, people have carried out to electronic chart from each side
Systematization, Study on Integration, develop it is integrated with function.
Electronic chart display and infor mation system（ECDIS）It is with the development of seafaring and science and technology and a kind of collection for producing
The real-time navigation information system of an accepted way of doing sth, is the great technological revolution of another item in terms of marine navigation after radar/ARPA.Press
According to International Hydrography Organization（IHO）Definition：ECDIS be it is a kind of by nautical chart information, location information, radar information,
Ship dynamic situation parameter is integrated in one the marine automation system that both pictures and texts are excellent.It is shown by electronic chart data file, control
Equipment, special-purpose software and external sensor are constituted.Therefore how effectively which preferably to be shown using electronic chart data
Show and be particularly important.
The storage format of existing electronic chart data mainly meets S-57（IHO hydrographic data exchange standards）Standard
's.Strictly speaking the data form of S-57 defineds is the file format that an order reads, and property target is believed
Breath is all put together, is not classified and association process, it is impossible to realize the quick display of data, therefore any one life
Product system and application system are the storage formats that impossible use it as internal quick manipulation data.But the data of S-57 defineds
Model and coded system are that various applying electronic sea chart systems are had to comply with.The key point of S-57 standards can be summarized as following
Several：（1）S-57 is defined towards ocean geography spatial entities, and it is indifferent to how data show, is only concerned how to use and is compiled
Code data are complete entity description, define clear.Thing mark towards sea chart classifies S-57 only with 181 thing marks and 195 attributes
Geographical entity representated by nearly 1,000 kinds of symbols in schema is defined clear.（2）Process of the S-57 to attribute of object takes elongated
Data, i.e. each thing target attribute number can be necessary with difference, attribute point A, B, C three-level, the mandatory attribute of relation safety of maritime navigation
Assignment, other attributes are not essential, and user can also add.（3）The thing mark class of S-57 can correspond to different geometric graphic elements, point,
Line, face, or non-geometric pel.（4）S-57 predominantly produces ENC and formulates, and is to cover whole ocean geography spatial information field,
Produce until market demand from data acquisition, data drawing, data.（5）S-57 is data exchange standard, is independently of machine structure
That what is made transmits the file mechanism of data from a computer architecture to another computer architecture.（6）Subset ENC of S-57 includes
Two parts, New Version Electronic navigation diagram data EN and chart correction data ER.（7）Each ENC of chi is each other on ground in proportion
Can overlap on domain, but the content of overlay region can only be concentrated in a data and be occurred.（8）ENC is not Paper Chart " data shadow
Picture ", it is inadequate to make ENC and depend merely on Paper Chart, it is necessary to which other data of supplement enter list of lights, harbour guide, sailing direction etc..
Based on above technical background, existing electronic chart data shows：
（1）Do not carry out any conversion directly to show to electronic chart data.Its flow process is as shown in Figure 2.This kind of scheme
The data such as the point, line, surface in electronic chart source data are directly read before electronic chart is shown and is reconstructed, after reconstruct
Point, line, surface carry out projection transform and carry out charting to after screen coordinate on display terminal and show.This process reengineering
Substantial amounts of CPU will be taken with the process of projection transform.
（2）Based on SENC（System electronic nautical chart）Electronic chart data conversion be currently to compare popular process side
Case.Its flow process is as shown in Figure 3.Electronic chart data is processed by this scheme, the point, line, surface information after storage reconstruct.Aobvious
The point, line, surface information after reconstruct is projected before showing electronic chart, then shown.This procedures system eliminates weight
Therefore shared CPU decreases for the process of structure, but memory space occupies and can increase nearly 100%.
（3）The electronic chart data processing scheme of half grid, half vector.
Method its shortcoming directly shown for electronic chart data does not carry out any conversion：This kind of bill is direct
The data such as the point, line, surface in electronic chart data are reconstructed then which is carried out projection transform to after screen coordinate
Charting is carried out on display terminal and is shown.As the process for reconstructing and projecting calculates more complicated, it will take substantial amounts of
CPU.These drawbacks cause the switching display speed of sea chart slow, sea chart is operated and easily causes systemic breakdown；Sea chart is entered
Time-consuming for the operations such as row increases, deletes, modification, inquiry, and system is unstable.
Electronic chart data based on SENC is changed, and this scheme eliminates the process of reconstruct therefore shared CPU decreases,
But occupy and can increase nearly 100% due to storing the point, line, surface information space after reconstruct.
The chart data processing scheme of half grid, half vector due to grid sea chart be existing Paper Chart is scanned after
Storage, it is taken up space big, it is impossible to which that the thing mark on sea chart is carried out the operation such as inquiring about.
Accordingly, it would be desirable to a kind of new electronic chart data switch technology, can make display speed faster, Computer Storage is reduced
Space and the occupancy of CPU.
The content of the invention
In order to solve at least one above-mentioned technical problem, it is proposed that a kind of new electronic chart data switch technology, can make
Display speed faster, lowers the use of memory space and the occupancy of CPU.
In view of this, according to an aspect of the invention, there is provided a kind of electronic chart data conversion equipment, its feature exists
In, including：Data-reading unit, for reading the original electron chart data in source file；Date Conversion Unit, for institute
State original electron chart data to be reconstructed and projection process；Data storage cell, by the electricity after reconstruct and projection process
Sub- chart data is stored as the electronic chart data of user-defined format；Display unit, for reading the electricity of the user-defined format
Sub- chart data, and sea chart drafting and display are carried out according to the electronic chart data for reading.
By above-mentioned technical proposal, the processing procedure for being reconstructed to original electron chart data and projecting is simplified, from
And reduce the CPU during electronic chart data is processed and take, and the electronic chart preserved according to user-defined format
Data can make the display speed of sea chart faster, operate more smooth.
In above-mentioned technical proposal, it is preferred that the Date Conversion Unit includes：Reconstruction calculations subelement, according to thing mark
Geometric type（Point, line, surface）, coordinate, space, attribute information, computing is reconstructed to the original electron chart data；Throw
Shadow computation subunit, thing target coordinate data in the electronic chart data after reconstruct is substituted in Mercator projection conversion formula,
Plane coordinates data after being projected.
By above-mentioned technical proposal, original electron chart data is entered according to thing target geometric type, space, attribute information
Row collating sort, be not in order by the data stacking of property punctuate together, and to all coordinates of sea chart thing target
Once projected, once projected once without the need for often showing after this, greatly accelerate display processing speed.
In above-mentioned technical proposal, it is preferred that when being reconstructed to the original electron chart data, will be described original
The original coordinates data of character type or floating type in electronic chart data are converted to the coordinate data of 24 bit integers.One word
The data of symbol type or double types need 8 to 10 bytes, therefore, the redundant data such as thing target space and attribute in consideration
Afterwards, averagely one character type of storage or double types data are reduced to 5 bytes, the compression of data storage by 8 to 10 bytes
Ratio is reached between five ten ten to percent 4 percent, so as to effectively reduce accounting for for the occupancy to memory space and CPU
With.
In above-mentioned technical proposal, it is preferred that the electronic chart data of the user-defined format includes the basic letter of sea chart
Breath and the electronic chart data after reconstruct and projection transform.
In above-mentioned technical proposal, it is preferred that the essential information of the sea chart includes the title of sea chart, purposes, version, more
Redaction, publication date, update date, projecting method, data edition engineer's scale, scope and/or datum level, it is described through reconstruct
Include thing target coordinate data, attribute information and/or spatial information with the electronic chart data after projection transform.In the technical side
In case, when electronic chart data is preserved, on the basis of the precision at utmost ensureing chart data, thing target is increased empty
Between, attribute information, the electronic chart information of display can be made more complete.
By above-mentioned technical proposal, it is possible to achieve a kind of more perfect electronic chart data conversion equipment, can lower and account for
Memory space and CPU internal memories, realize that data quickly show.The operation such as increase, deletion, modification, inquiry to sea chart is more flowed
Freely, system is more stable.
According to another aspect of the present invention, a kind of electronic chart data conversion method is additionally provided, including：Read source document
Original electron chart data in part；The original electron chart data is reconstructed and projection process；Will through reconstruct and
Electronic chart data after projection process is stored as the electronic chart data of user-defined format；Read the electricity of the user-defined format
Sub- chart data, and sea chart drafting and display are carried out according to the electronic chart data for reading.
By above-mentioned technical proposal, the processing procedure for being reconstructed to original electron chart data and projecting is simplified, from
And reduce the CPU during electronic chart data is processed and take, and the electronic chart preserved according to user-defined format
Data can make the display speed of sea chart faster, operate more smooth.
In above-mentioned technical proposal, it is preferred that the original electron chart data is reconstructed and projection process step
Suddenly specifically include：According to thing target geometric type, coordinate, space, attribute information, weight is carried out to the original electron chart data
Structure computing；Thing target coordinate data in electronic chart data after reconstruct is substituted in Mercator projection conversion formula, is thrown
The plane coordinates information of movie queen.
By the technical scheme, original electron chart data is carried out according to thing target geometric type, space attribute information
Collating sort, be not in order by the data stacking of property punctuate together, and all coordinates of sea chart thing target are entered
Go, after this, once projected once without the need for often showing, greatly accelerate display processing speed.
In above-mentioned technical proposal, it is preferred that when being reconstructed to the original electron chart data, will be described original
The original coordinates data of character type or floating type in electronic chart data are converted to the coordinate data of 24 bit integers.One word
The data of symbol type or double types need 8 to 10 bytes, therefore, the redundant data such as thing target space and attribute in consideration
Afterwards, averagely one character type of storage or double types data are reduced to 5 bytes, the compression of data storage by 8 to 10 bytes
Ratio is reached between five ten ten to percent 4 percent, so as to effectively reduce accounting for for the occupancy to memory space and CPU
With.
In above-mentioned technical proposal, it is preferred that the electronic chart data of the user-defined format includes the basic letter of sea chart
Breath and the electronic chart data after reconstruct and projection transform.
In above-mentioned technical proposal, it is preferred that the essential information of the sea chart includes the title of sea chart, purposes, version, more
Redaction, publication date, update date, projecting method, data edition engineer's scale, scope and/or datum level, it is described through reconstruct
Include thing target coordinate data, attribute information and/or spatial information with the electronic chart data after projection transform.In the technical side
In case, when electronic chart data is preserved, on the basis of the precision at utmost ensureing chart data, thing target is increased empty
Between attribute information, the electronic chart information of display can be made more complete.
By above-mentioned technical proposal, a kind of new data transfer device mainly for electronic chart data is realized.With
Original technology is compared on the premise of the integrality and correctness of data is ensured, space occupancy is lower, and sea chart display speed is more
Hurry up, sea chart shows more stable, reduce the display speed that chart data is taken up space, improve sea chart.Realize vector electricity
Sub- application of chart is on the equipment that cannot be applied before（Such as equipment such as panel computer, mobile phone）.
Description of the drawings
Fig. 1 shows electronic chart data process chart in correlation technique；
Fig. 2 shows the electronic chart data flow path switch figure in correlation technique based on SENC；
Fig. 3 shows the block diagram of electronic chart data conversion equipment according to an embodiment of the invention；
The flow chart that Fig. 4 shows electronic chart data conversion method according to an embodiment of the invention；
Fig. 5 shows electronic chart data transition diagram according to an embodiment of the invention；
The flow chart that Fig. 6 shows electronic chart data conversion method according to an embodiment of the invention.
Specific embodiment
It is in order to be more clearly understood that the above objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and concrete real
Apply mode to be further described in detail the present invention.It should be noted that in the case where not conflicting, the enforcement of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment restriction.
It is in order to be more clearly understood that the above objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and concrete real
Apply mode to be further described in detail the present invention.It should be noted that in the case where not conflicting, the enforcement of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment restriction.
Fig. 3 shows block diagram according to an embodiment of the invention based on electronic chart data conversion equipment.
As shown in figure 3, being based on electronic chart data conversion equipment 400 according to an embodiment of the invention, can include：Number
According to reading unit 402, for reading the original electron chart data in source file；Date Conversion Unit 404, for the original
Beginning electronic chart data is reconstructed and projection process；Data storage cell 406, by the electronics after reconstruct and projection process
Chart data is stored as the electronic chart data of user-defined format；Display unit 408, reads the electron sea of the user-defined format
Diagram data, and sea chart drafting and display are carried out according to the electronic chart data for reading.
By above-mentioned technical proposal, the processing procedure for being reconstructed to original electron chart data and projecting is simplified, from
And reduce the CPU during electronic chart data is processed and take, and the electronic chart preserved according to user-defined format
Data can make the display speed of sea chart faster, operate more smooth.
In above-mentioned technical proposal, it is preferred that the Date Conversion Unit 404 includes：Reconstruction calculations subelement 4042, presses
According to thing target geometric type, coordinate, space, attribute information, computing is reconstructed to the original electron chart data；Projection meter
Operator unit 4044, thing target coordinate data in the electronic chart data after reconstruct is substituted in Mercator projection conversion formula,
Plane coordinates data after being projected.
By above-mentioned technical proposal, according to thing target geometric type, coordinate, space, attribute information to original electron sea chart
Data carry out collating sort, be not in order by the data stacking of property punctuate together, and to sea chart thing target institute
There is coordinate once to be projected, after this, once projected once without the need for often showing, greatly accelerate display processing speed
Degree.
In above-mentioned technical proposal, it is preferred that when being reconstructed to the original electron chart data, will be described original
The original coordinates data of character type or floating type in electronic chart data are converted to the coordinate data of 24 bit integers.One word
The data of symbol type or double types need 8 to 10 bytes, therefore, the redundant data such as thing target space and attribute in consideration
Afterwards, averagely one character type of storage or double types data are reduced to 5 bytes, the compression of data storage by 8 to 10 bytes
Ratio is reached between five ten ten to percent 4 percent, so as to effectively reduce accounting for for the occupancy to memory space and CPU
With.
In above-mentioned technical proposal, it is preferred that the electronic chart data of the user-defined format includes the basic letter of sea chart
Breath and the electronic chart data after reconstruct and projection transform.
In above-mentioned technical proposal, it is preferred that the essential information of the sea chart includes the title of sea chart, purposes, version, more
Redaction, publication date, update date, projecting method, data edition engineer's scale, scope and/or datum level, it is described through reconstruct
Include thing target coordinate data, attribute information and/or spatial information with the electronic chart data after projection transform.In the technical side
In case, when electronic chart data is preserved, on the basis of the precision at utmost ensureing chart data, thing target is increased empty
Between attribute information, the electronic chart information of display can be made more complete.
By above-mentioned technical proposal, it is possible to achieve a kind of more perfect electronic chart data conversion equipment, can lower and account for
Memory space and CPU internal memories, realize that data quickly show.The operation such as increase, deletion, modification, inquiry to sea chart is more flowed
Freely, system is more stable.
In above-mentioned technical proposal, a kind of new data transfer device is employed, ensureing the integrality and correctness of data
On the premise of, data redundancy is eliminated as much as possible, reduces the display speed that sea chart is taken up space, improve sea chart.
Next combine Fig. 4 and Fig. 5 to describe electronic chart data conversion method of the invention in detail.
As shown in figure 4, in step 502, reading the original electron chart data in source file, internal memory 504 is write.
In step 506, it is stored as reconstructing through step 514 certainly with the electronic chart data after step 516 projection process
The electronic chart data of definition format.
With regard to the data reconstruction process of step 514, the chart data form of S-57 reference formats is that an order reads
File format, to data, is reconstructed by thing target geometric type, coordinate, space, attribute information spatial information and attribute information
Computing.In restructuring procedure, on the premise of precision is ensured, by original coordinates point data（Text formatting, a character type or
The data of double types need 8 to 10 bytes）, change the coordinate data of 3 byte formats.Need after considering reconstruct some its
His information（Attribute, space structure etc.）Storage, averagely the information of one character type of storage or double type data is by 8 ~ 10
Byte is reduced to 5 bytes, and data space has saved nearly 40%-50%, realizes in the premise for ensureing chart data precision
Under lossy compression method（With reference to Fig. 6）.
With regard to the projection transform process of step 516.By thing target coordinate point data generation in the electronic chart data in internal memory
Enter in Mercator projection conversion formula, the plane coordinates point information after being projected（The size of each plane coordinates information is
24bit）.
In the electronic chart data of the user-defined format of step 506 storage it is：The essential information of sea chart（Title, purposes, version
Sheet, more redaction, publication date, update date, projecting method, data edition engineer's scale, scope, datum level etc.）It is heavy with passing through
After structure projection transform（Step 514,516）Electronic chart data information（Point, line, surface thing target plane coordinates point information
（24bit）, attribute information, spatial information etc.）.
In step 508, when sea chart display unit need to show electronic chart data, the electronic chart number of preservation need to be only loaded
According to and shown for display unit.
In step 510, the sea chart management of deletion sea chart, more new chart is carried out by sea chart administrative unit.
In step 512, display unit 406, sea chart is shown.Chart data file after loading conversion is shown.
By above-mentioned processing procedure, at least following technical problem is solved：
1st, do not carry out any conversion directly to show to electronic chart data, directly using in electronic chart source data
The data such as point, line, surface are reconstructed, and the point, line, surface after reconstruct are carried out with projection transform to after screen coordinate in display terminal
On carry out charting and show.The process of this process reengineering and projection transform will take substantial amounts of CPU.The present invention is based on electronics
Chart data conversion equipment and electronic chart data conversion method, may be implemented in reconstruct and reduce byte during projecting, subtract
It is little to improve the display speed of sea chart to memory space and the occupancy of CPU, increased and sea chart additions and deletions are changed with system when looking into stablize
Property.
2nd, solve in the chart data processing scheme of half grid, half vector, as grid sea chart is to existing Paper Chart
Store after being scanned, it is taken up space big, it is impossible to which that the thing mark on sea chart is carried out the problem of operation such as inquiring about.
The flow chart that Fig. 6 shows electronic chart data conversion method according to an embodiment of the invention.
As shown in fig. 6, electronic chart data conversion method according to an embodiment of the invention, may comprise steps of：
Step 702, reads the original electron chart data in source file；Original electron chart data is reconstructed and projection process；
Electronic chart data after reconstruct and projection process is stored as the electronic chart data of user-defined format by step 704；Step
Rapid 706, the electronic chart data of user-defined format is read, and sea chart drafting is carried out according to the electronic chart data for reading and is shown
Show.
By above-mentioned technical proposal, the processing procedure for being reconstructed to original electron chart data and projecting is simplified, from
And reduce the CPU during electronic chart data is processed and take, and the electronic chart preserved according to user-defined format
Data can make the display speed of sea chart faster, operate more smooth.
In above-mentioned technical proposal, it is preferred that original electron chart data is reconstructed and is had the step of projection process
Body includes：According to thing target geometric type, coordinate, space, attribute information spatial information and attribute information, to the original electron
Chart data is reconstructed computing；Thing target coordinate data in electronic chart data after reconstruct is substituted into into Mercator projection conversion
Plane coordinates information in formula, after being projected.
By the technical scheme, according to thing target geometric type（Point, line, surface）, coordinate, space, attribute information preserve control
Part information and attribute information carry out collating sort to original electron chart data, are not in order by the number of property punctuate
According to being packed together, and all coordinate datas are once projected by all coordinates of sea chart thing target, after this, need not
Often show and once projected once, greatly accelerate display processing speed.
In above-mentioned technical proposal, it is preferred that when being reconstructed to the original electron chart data, will be described original
The original coordinates data of character type or floating type in electronic chart data are converted to the coordinate data of 24 bit integers.One word
The data of symbol type or double types need 8 to 10 bytes, therefore, the redundant data such as thing target space and attribute in consideration
Afterwards, store a character type or double types data are reduced to 5 bytes, the compression factor of data storage by 8 to 10 bytes
Reach between five ten ten to percent 4 percent, so as to effectively reduce the occupancy of the occupancy to memory space and CPU.
In above-mentioned technical proposal, it is preferred that the electronic chart data of the user-defined format includes the basic letter of sea chart
Breath and the electronic chart data after reconstruct and projection transform.
In above-mentioned technical proposal, it is preferred that the essential information of the sea chart includes the title of sea chart, version and/or goes out
Version date title, purposes, version, more redaction, the publication date, update date, projecting method, data edition engineer's scale, scope,
Datum level etc., it is described through reconstruct and projection transform after electronic chart data include thing target coordinate data, attribute information and/
Or spatial information.In the technical scheme, when electronic chart data is preserved, in the precision at utmost ensureing chart data
On the basis of, thing target space attribute information is increased, the electronic chart information of display can be made more complete.By the technical scheme,
Realize a kind of a kind of new data transfer device mainly for electronic chart data.Ensureing data compared with original technology
Integrality and correctness on the premise of, space occupancy is lower, and faster, sea chart shows more stable to sea chart display speed, reduce
Sea chart is taken up space, improve the display speed of sea chart.Realize what is cannot applied before vector electronic chart is applied to
On equipment（Such as equipment such as panel computer, mobile phone）.
Technology according to the present invention scheme is described in detail above in association with accompanying drawing, by technical scheme, realizes
A kind of new data transfer device for electronic chart data, enriches electronic chart storage information, reduces chart data
Display speed that is taken up space, improve sea chart.After the technological difficulties such as electronic chart storage and display speed are solved, can
On the equipment that cannot be applied before vector electronic chart is applied to, product cost is reduced to a certain extent.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. a kind of electronic chart data conversion equipment, it is characterised in that include：
Data-reading unit, for reading the original electron chart data in source file；
Date Conversion Unit, for being reconstructed and projection process to the original electron chart data；
Electronic chart data after reconstruct and projection process is stored as the electron sea of user-defined format by data storage cell
Diagram data；
Display unit, reads the electronic chart data of the user-defined format, and carries out sea according to the electronic chart data for reading
Figure is drawn and is shown；
The Date Conversion Unit includes：
Reconstruction calculations subelement, according to thing target geometric type, coordinate, spatial information, attribute information, to original electron sea
Diagram data is reconstructed computing；
The reconstruction calculations subelement is additionally operable to when being reconstructed to the original electron chart data, by the original electron
The original coordinates data of character type or floating type in chart data are converted to the coordinate data of 24 bit integers.
2. electronic chart data conversion equipment according to claim 1, it is characterised in that the Date Conversion Unit is also wrapped
Include：
Thing target coordinate data in electronic chart data after reconstruct is substituted into Mercator projection conversion public by projection computation subunit
Plane coordinates data in formula, after being projected.
3. electronic chart data conversion equipment according to claim 1 and 2, it is characterised in that the user-defined format
Electronic chart data includes the essential information of sea chart and the electronic chart data after reconstruct and projection transform.
4. electronic chart data conversion equipment according to claim 3, it is characterised in that the essential information bag of the sea chart
Include the title of sea chart, purposes, version, more redaction, publication date, update date, projecting method, data edition engineer's scale, model
Enclose and/or datum level, the electronic chart data after reconstruct and projection transform includes thing target coordinate data, attribute letter
Breath and/or spatial information.
5. a kind of electronic chart data conversion method, it is characterised in that include：
Read the original electron chart data in source file；
The original electron chart data is reconstructed and projection process；
Electronic chart data after reconstruct and projection process is stored as into the electronic chart data of user-defined format；
The electronic chart data of the user-defined format is read, and sea chart drafting is carried out according to the electronic chart data for reading and is shown
Show；
The original electron chart data is reconstructed and is included the step of projection process：
According to thing target geometric type, coordinate, space, attribute information, computing is reconstructed to the original electron chart data；
When being reconstructed to the original electron chart data, by character type or floating-point in the original electron chart data
The original coordinates data of type are converted to the coordinate data of 24 bit integers.
6. electronic chart data conversion method according to claim 5, it is characterised in that to the original electron sea chart number
According to being reconstructed and also include the step of projection process：
Thing target coordinate data in electronic chart data after reconstruct is substituted in Mercator projection conversion formula, after being projected
Plane coordinates information.
7. the electronic chart data conversion method according to claim 5 or 6, it is characterised in that the user-defined format
Electronic chart data includes the essential information of sea chart and the electronic chart data after reconstruct and projection transform.
8. electronic chart data conversion method according to claim 7, it is characterised in that the essential information bag of the sea chart
Include the title of sea chart, purposes, version, more redaction, publication date, update date, projecting method, data edition engineer's scale, model
Enclose and/or datum level, the electronic chart data after reconstruct and projection transform includes thing target coordinate data, attribute letter
Breath and/or spatial information.
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| CN201310067220.1A CN103164516B (en) | 2013-03-01 | 2013-03-01 | Electronic chart data conversion equipment and electronic chart data conversion method |
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| CN105678825B (en) * | 2014-11-17 | 2018-11-30 | 北京艾梦海洋科技有限公司 | A kind of method for quickly filling of S57 electron sea drawing domain color |
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