CN110032610A - A kind of scale vector method for exhibiting data and system - Google Patents
A kind of scale vector method for exhibiting data and system Download PDFInfo
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- CN110032610A CN110032610A CN201910184322.9A CN201910184322A CN110032610A CN 110032610 A CN110032610 A CN 110032610A CN 201910184322 A CN201910184322 A CN 201910184322A CN 110032610 A CN110032610 A CN 110032610A
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- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
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Abstract
A kind of scale vector method for exhibiting data of the present invention, comprising: the geometry type building vector data storing data library based on MySQL5.7 is simultaneously stored in vector data；Inquiry request based on the query region that OpenLayers engine map is sent, does space querying to vector data storing data library；And the vector data of the GeoJSON format of the query region that dynamic rendering is returned by Web service from vector data storing data library, and shown in browser.Scheme provided by the invention integrates the geometry type of MySQL5.7 offer and the storage and display of OpenLayers engine map realization vector data, popularization degree is higher at home for MySQL database, for domestic current main-stream database, domestic existing many softwares are using MySQL database, technical solution provided by the invention makes the methods of exhibiting of scale vector data that can realize Seamless integration- with existing software project, reduces early development difficulty and later maintenance cost.
Description
Technical field
The invention belongs to GIS data processing technology fields, are to be related to a kind of extensive arrow more specifically
Measure method for exhibiting data and system.
Background technique
GIS-Geographic Information System is with acquisition, storage, management, operation, analyzes, data surface all or in part is shown and described
The computer system of data related with space and geographical distribution.GIS starts from the Canada and the U.S. of the sixties, thereafter various countries' phase
After putting into a large amount of research work, especially under the promotion of computer technology rapid development, hand is analyzed in the processing of geography information
Section is increasingly advanced, and GIS technology is ripe day by day, and the definition of GIS has no longer been limited to the map on paper at this time, it has become one
The new discipline that a computer technology and a variety of subjects intersect, generally, GIS be generated using mapping paper map or
It takes photo by plane and after satellite etc. generates image, stores that data in computer, showed in the form of map or picture,
Then according to the various demands in actual production life and scientific research, and then specific data after treatment are provided；At present
GIS is in environment, resource, petroleum, electric power, soil, traffic, public security, first aid, aviation, municipal administration, urban planning, economy
Nearly all fields relevant to geographical coordinate such as consulting, casualty loss prediction, the investment appraisal, governability and military affairs obtain
It is widely applied.
Generalized information system has the function of space querying, spatial analysis and attribute management abundant.Not with Internet technology
Disconnected development and demand of the people to generalized information system, blend generalized information system and network technology, present a kind of novel GIS system
System, i.e. WebGIS, the concept of the system are the products that Internet technology is applied to the field GIS.Pass through any one of WWW
A node, Internet user can browse the spatial data of WebGIS system website, production thematic map, and carry out various
Spatial retrieval and spatial analysis.
The frame of WebGIS includes front end, background program and data, and wherein the data of WebGIS can substantially be divided into three kinds,
One is maps, image data, and one is space attribute data, and one is business datums.Space attribute data include space number
According to and attribute data, spatial data be for describe from reality target, data are unitized, so as to showing spatial entities
Shape size and position and distribution characteristics.Spatial data structure is tissue and coding shape of the spatial data in computer
Formula, it is a kind of logical construction for being suitable for computer storage, management and processing space data, is the space arrangement of geographical entity
With the abstractdesription of correlation, the i.e. method for organizing of data of geographical entity itself.The structure type of spatial data is divided into grid
Lattice data and vector data.
Raster data is the Method of Data Organization for coming representation space atural object or phenomenon distribution in the form of two-dimensional matrix, each
Matrix unit is known as a grid cell (Cell), and each data of grid indicate the attribute data of atural object or phenomenon, therefore grid
Lattice data have attribute obvious, position implicit feature.With the fast development and extensive use and data compression of remote sensing technology
The raising of technology, computer performance, the display of extensive raster data, which has developed, more mature pyramid classification display side
Method.Vector data is using point, line, and the form in face has to express real world and positions obvious, the implicit feature of attribute.By
Have data structure compact in vector data, redundancy is low, and expression precision is high, and graphical display is high-quality, is conducive to network and inspection
The advantages that rope is analyzed, has been widely used in WebGIS.But with the arrival of big data era, high-precision, wide covering
Vector data present explosive growth, it is in the urgent need to address how effectively to store and show that scale vector data become
Problem.
Storage and display for scale vector data are solved using more and more mature open source in the world at present
Scheme is realized by integrating the PostGIS plug-in unit of OpenLayers and PostgreSQL.OpenLayers is one and aims at
The JavaScript class libraries packet that the exploitation of Web GIS client provides, for realizing the map datum access of reference format publication.
PostGIS is an open source program, it provides memory space geodata for Object-Relation Database PostgreSQL
Support, so that PostgreSQL is become a spatial database, be able to carry out spatial data management, takeoff and geometry and open up
Flutter analysis.It is (point, line, surface, more that PostGIS realizes fundamental class that Open Geospatial Consortium proposed
Point, multi-thread, multi-panel etc.) SQL realize reference.
But at home, in contrast, popularization degree is lower in the market for PostgreSQL database, if support vector
The storage and display of data and specially in development project increase newly PostgreSQL database, not only increase early development
Cost, and increase the difficulty of market recognition and acceptance.It is therefore proposed that one kind is adapted to current domestic Sybase
Scale vector data storage and display methods be very necessary.
Summary of the invention
The purpose of the present invention is to provide a kind of scale vector method for exhibiting data and systems, to solve in the prior art
The technology of the existing domestic storage for lacking the scale vector data for being adapted to current domestic Sybase and display methods
Problem.
To achieve the above object, in a first aspect, the present invention provides a kind of scale vector method for exhibiting data, comprising:
Geometry type building vector data storing data library based on MySQL5.7 is simultaneously stored in vector data；
Inquiry request based on the query region that OpenLayers engine map is sent, does space to vector data storing data library
Inquiry；
And
The GeoJSON format for the query region that dynamic rendering is returned by Web service from vector data storing data library
Vector data, and shown in browser.
By implementing above-mentioned technical proposal, the geometry type and OpenLayers map for integrating MySQL5.7 offer are drawn
The storage and display for realizing vector data are held up, it is domestic current main-stream database that popularization degree is higher at home for MySQL database,
Domestic existing many softwares are using MySQL database, and technical solution provided by the invention makes scale vector data
Methods of exhibiting can realize Seamless integration- with existing software project, reduce early development difficulty and later maintenance cost.
Preferably, the space field in vector data storing data library is added with spatial index.
By implementing above-mentioned technical proposal, the retrieval rate in vector data storing data library is improved.
Preferably, the query region is the current display area of OpenLayers engine map, and
OpenLayers engine map current display area sends the inquiry request of the query region when changing.
By implementing above-mentioned technical proposal, the vector data that OpenLayers engine map is shown is current display area
Interior vector data has buffering capacity small, buffer speed is fast, greatly improves ground compared to display all vector datas of map
The viewing experience of figure.
Preferably, the space querying in vector data storing data library includes:
Meet the object of the query region in retrieval vector data storing data library；
The Format Object that retrieves is converted as GeoJSON format and OpenLayers map is back to by Web service draws
It holds up.
On the other hand, the present invention also provides a kind of, and the scale vector data based on MySQL5.7 and OpenLayers are shown
System, comprising:
Vector data storing data library: the geometry type based on MySQL5.7 constructs vector data, and base for storage
Space querying is done in the inquiry request received to export the vector data of GeoJSON format；
OpenLayers engine map is sent by Web service to vector data storing data library with current display area
For the inquiry request of query region, the vector data returned from the vector data storing data library is dynamically rendered；And
Browser shows the vector data after OpenLayers engine map dynamic renders.
By implementing above scheme, geometry type and the OpenLayers engine map for integrating MySQL5.7 offer are real
The storage and display of existing vector data, popularization degree is higher at home for MySQL database, domestic for domestic current main-stream database
Existing much softwares are using MySQL database, and technical solution provided by the invention makes the displaying of scale vector data
Method can realize Seamless integration- with existing software project, reduce early development difficulty and later maintenance cost.
The beneficial effect of a kind of scale vector method for exhibiting data provided by the invention and system is:
A kind of scale vector method for exhibiting data of the present invention, comprising: the geometry type structure based on MySQL5.7
It builds vector data storing data library and is stored in vector data；Inquiry based on the query region that OpenLayers engine map is sent
Request, does space querying to vector data storing data library；And dynamic rendering stores number from vector data by Web service
According to the vector data of the GeoJSON format of the query region of library return, and shown in browser.Scheme provided by the invention
The geometry type and OpenLayers engine map of integrating MySQL5.7 offer realize the storage and display of vector data,
Popularization degree is higher at home for MySQL database, and for domestic current main-stream database, domestic existing many softwares are to use
MySQL database, technical solution provided by the invention make the methods of exhibiting of scale vector data can be with existing software item
Mesh realizes Seamless integration-, reduces early development difficulty and later maintenance cost.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the logical flow chart that a kind of scale vector method for exhibiting data provided in an embodiment of the present invention is realized.
Specific embodiment
In the following detailed description, many details are proposed, in order to complete understanding of the present invention.But
It will be apparent to those skilled in the art that the present invention can not need some details in these details
In the case of implement.Below to the description of embodiment just for the sake of provided by showing example of the invention to it is of the invention more
Understand well.
Below in conjunction with attached drawing, the technical solution of the embodiment of the present invention is described.
The present invention relates to a kind of scale vector data display systems based on MySQL5.7 and OpenLayers are disclosed, wrap
It includes:
Vector data storing data library: the geometry type based on MySQL5.7 constructs vector data, and base for storage
Space querying is done in the inquiry request received to export the vector data of GeoJSON format；
OpenLayers engine map is sent by Web service to vector data storing data library with current display area
For the inquiry request of query region, the vector data returned from vector data storing data library is dynamically rendered；And
Browser shows the vector data after OpenLayers engine map dynamic renders.
MySQL is a Relational DBMS, and relevant database is saved the data in different tables,
It is stored in one big warehouse compared to by data, has the advantages that the fast flexibility of speed is good.Simultaneously because of MySQL open-source
Code, becomes one of the database of the preferred use of software project development, occupation rate of market at small in size, the features such as speed is fast
It is high.MySQL5.7 is the MySQL version of publication in 2015,3 times is improved compared to MySQL5.6 speed, and at the same time improving
Availability, manageability and safety increase completely new GIS module, provide geometry type.
As shown in Figure 1, the extensive arrow of the scale vector data display systems based on MySQL5.7 and OpenLayers
Measuring method for exhibiting data includes:
Geometry type building vector data storing data library based on MySQL5.7 is simultaneously stored in vector data；
It is worth noting that the space field in the vector data storing data library is added to spatial index, which greatly enhances arrows
Datum number storage is measured according to the retrieval rate in library.
Inquiry request based on the query region that OpenLayers engine map is sent, does vector data storing data library
Space querying；
Specifically, connection is established by Web service in OpenLayers engine map and vector data storing data library,
The query region that OpenLayers engine map is sent is the current display area of OpenLayers engine map, and
When the current display area of OpenLayers engine map changes, when such as dragging mouse on a web browser, OpenLayers
Engine map is the inquiry request for passing through Web service and sending the query region changed to vector data storing data library.Simply
For, OpenLayers engine map only shows the vector data in current display area every time, compared to disposable display institute
There is the vector data in region, has data volume small, compensator or trimmer pressure is small, the good advantage of viewing experience degree.
Specifically, carrying out space querying after vector data storing data library receives inquiry request, comprising: retrieval arrow
Datum number storage is measured according to the object for meeting query region in library；
It converts the Format Object retrieved and is back to OpenLayers engine map into GeoJSON format and by Web service.
In at least one embodiment of the invention, the spatial query language in vector data storing data library are as follows:
select*,concat(ST_AsGeoJON(geom,6),' ') as gison from dltb where ST_
Intersects(ST_Geom FromText(extent),geom)
The vector of the GeoJSON format for the query region that dynamic rendering is returned by Web service from vector data storing data library
Data, and shown in browser.
GeoJSON is a kind of format encoded to various gis structure datas, is indicated based on Javascript object
The geospatial information data interchange format of method.
It is above to realize scale vector method for exhibiting data, this method by integrate MySQL5.7 GIS module and
OpenLayers engine map realizes the quick display of scale vector data, and MySQL is as open source system, for WebGIS
The exploitation of project has the advantages that reduce software development cost, and MySQL also increases as domestic Sybase system
The strong Seamless integration- of WebGIS project and existing software project, reduces software development difficulty.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than limits the protection scope of invention.It is aobvious
So, described embodiment is only section Example of the present invention, rather than whole embodiments.Based on these embodiments, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to institute of the present invention
Scope of protection.Although referring to above-described embodiment, invention is explained in detail, those of ordinary skill in the art according to
So creative work can not be made to according to circumstances mutual group of the feature in various embodiments of the present invention in the absence of conflict
Other adjustment are made in conjunction, additions and deletions, so that different, the essential other technologies scheme without departing from design of the invention is obtained, these
Technical solution similarly belongs to invention which is intended to be protected.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of scale vector method for exhibiting data characterized by comprising
Geometry type building vector data storing data library based on MySQL5.7 is simultaneously stored in vector data；
Inquiry request based on the query region that OpenLayers engine map is sent, does space to vector data storing data library
Inquiry；
And
The GeoJSON format for the query region that dynamic rendering is returned by Web service from vector data storing data library
Vector data, and shown in browser.
2. a kind of scale vector method for exhibiting data as described in claim 1, which is characterized in that vector data storing data
The space field in library is added with spatial index.
3. a kind of scale vector method for exhibiting data as claimed in claim 2, which is characterized in that the query region is
The current display area of OpenLayers engine map, and OpenLayers engine map current display area when changing i.e.
Send the inquiry request of the query region.
4. a kind of scale vector method for exhibiting data as claimed in claim 3, which is characterized in that vector data storing data
The space querying in library includes:
Meet the object of the query region in retrieval vector data storing data library；
The Format Object that retrieves is converted as GeoJSON format and OpenLayers map is back to by Web service draws
It holds up.
5. a kind of scale vector data display systems based on MySQL5.7 and OpenLayers characterized by comprising
Vector data storing data library: the geometry type based on MySQL5.7 constructs vector data, and base for storage
Space querying is done in the inquiry request received to export the vector data of GeoJSON format；
OpenLayers engine map is sent by Web service to vector data storing data library with current display area
For the inquiry request of query region, the vector data returned from the vector data storing data library is dynamically rendered；And
Browser shows the vector data after OpenLayers engine map dynamic renders.
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| CN201910184322.9A CN110032610A (en) | 2019-03-12 | 2019-03-12 | A kind of scale vector method for exhibiting data and system |
| PCT/CN2019/098761 WO2020181711A1 (en) | 2019-03-12 | 2019-08-01 | Large-scale vector data presentation method and system based on mysql5.7 and openlayers |
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| CN115114356A (en) * | 2022-06-28 | 2022-09-27 | 河北平普数政科技有限公司 | Real-time decryption method based on vector data front-end display |
| CN115114356B (en) * | 2022-06-28 | 2023-03-21 | 河北平普数政科技有限公司 | Real-time decryption method based on vector data front-end display |
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Application publication date: 20190719 |