CN110413721B - Vector map generation method and device - Google Patents
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Abstract
The invention relates to a method and a device for generating a vector map. The method comprises the following steps: based on a GIS tool, matching the vector map data to obtain a matching pattern file; obtaining an element layering configuration file and a rendering style configuration file of the vector map data based on the mapping style file; compiling the mapping style file based on the element hierarchical configuration file to obtain target vector data; and rendering the target vector data based on the rendering style configuration file to obtain a vector map. The method and the device provided by the embodiment of the invention can simply obtain the compiling experience, and complete the customization and adaptation of the compiling and rendering stages; the threshold and difficulty of compiling the vector map data are reduced; the compiling efficiency and the data quality are improved; the universality and the compatibility of the compiling system are improved, and the customized compiling requirements of source data with different formats and users can be realized.
Description
Technical Field
The invention relates to the technical field of digital maps and geographic information, in particular to a method and a device for generating a vector map.
Background
The current commonly used spatial data structures comprise two categories of vector structures and grid structures, wherein the vector structures have the characteristics of obvious positions and hidden attributes, the data expression precision of the vector structures is high, the storage capacity is small, the output graphs are attractive, the working efficiency is high, and the topology and network analysis is easy to realize. Therefore, map data of a vector structure is indispensable in the field of digital maps.
In order to generate a vector map for presentation to a user, map data of a vector structure (hereinafter, referred to as vector map data) needs to be compiled and rendered. The compiling process of the vector map data comprises the following steps: source data in vector exchange format (i.e. vector map data in format shape, mif, geojson, postgis, etc.) is compiled into target vector data (in format nds, kiwi, mvt, etc.) supported by the map engine. The target vector data has the following characteristics: the data is composed of elements, and the elements include figures and attributes, and are classified into point elements, line elements, and surface elements according to the figures. The data is separated from the rendering style, and the elements do not contain rendering-related style information such as color, font, character size, line type, line width and the like.
Because the target vector data has the characteristic of separating data from the rendering style, the compiled target vector data needs to be rendered, namely, the vector map can be obtained only by configuring the rendering style, so that the vector map can be displayed.
Fig. 1 is a flowchart of compiling and rendering vector map data in the prior art, and as shown in fig. 1, the compiling and rendering steps are as follows:
1. starting compiling;
2. configuring element layering rules;
3. according to the element layering rule, carrying out element layering configuration;
4. compiling the source data according to the element layering rule and the element layering configuration to obtain target vector data;
5. starting rendering;
6. configuring a rendering style;
7. according to the rendering style, performing rendering style configuration;
8. and rendering the target vector data according to the rendering style and the rendering style configuration to obtain the vector map.
However, in the prior art, the compiling and rendering efficiency is low, and meanwhile, the quality of the obtained vector map is poor, and the universality and the compatibility are poor.
Disclosure of Invention
The invention provides a method and a device for generating a vector map, aiming at the technical problems in the prior art, and solving the problems of large memory consumption and large synthesis workload of a graph cache in the traditional graph display mode.
The technical scheme for solving the technical problems is as follows:
in a first aspect, the present invention provides a method for generating a vector map, including:
based on a GIS tool, matching the vector map data to obtain a matching pattern file;
obtaining an element layering configuration file and a rendering style configuration file of the vector map data based on the mapping style file;
compiling the mapping style file based on the element hierarchical configuration file to obtain target vector data;
and rendering the target vector data based on the rendering style configuration file to obtain a vector map.
The invention has the beneficial effects that: the customized user requirements are completed in a diagram matching mode, the customization and adaptation of two stages of compiling and rendering are completed based on a diagram matching result, and what you see is what you get compiling experience is realized; the threshold and difficulty of vector map data compiling are reduced, and map matching skills of a GIS tool are mastered, namely, data compiling and testing work is undertaken; the compiling efficiency and the data quality are improved, and the possibility of errors and the times of repeated compiling of data are reduced through a what you see is what you get compiling mode; the method improves the universality and compatibility of the compiling system, the GIS tool is a universal tool platform and provides wide support for vector exchange data formats, and the universal platform tool can meet the customized compiling requirements for source data in different formats and users.
Further, obtaining an element hierarchical configuration file and a rendering style configuration file of the vector map data based on the mapping style file, including:
exporting the layout style file to a sld format style file of ogc;
extracting element layering rules and element rendering style rules in the style file;
and converting the element layering rule into the element layering configuration file, and converting the element rendering style rule into the rendering style configuration file.
Further, extracting element layering rules and element rendering style rules in the style file comprises:
extracting rule rules in the style file;
extracting filter element hierarchical information and attribute field information associated with rendering in the rule to serve as the element hierarchical rule;
and extracting a rule associated with the display in the rule as the element rendering style rule.
Further, the rule associated with display is a textsymbolozer, pointsymbolozer, linesymbolozer, or polygonsymbolozer rule.
Further, compiling the layout style file based on the element hierarchical configuration file to obtain target vector data, including:
layering the elements in the layout style file according to element layering information in the element layering configuration file;
and adding attribute field information associated with rendering in the element hierarchical configuration file to a corresponding layer, and compiling to obtain the target vector data.
In a second aspect, the present invention provides an apparatus for generating a vector map, including:
the map matching module is used for matching map of the vector map data based on a GIS tool to obtain a map matching style file;
the file acquisition module is used for obtaining an element hierarchical configuration file and a rendering style configuration file of the vector map data based on the map matching style file;
the compiling module is used for compiling the layout style file based on the element hierarchical configuration file to obtain target vector data;
and the rendering module is used for rendering the target vector data based on the rendering style configuration file to obtain a vector map.
Further, the file acquisition module includes:
an export unit, configured to export the layout style file into a style file of an sld format of an ogc;
the extraction unit is used for extracting element layering rules and element rendering style rules in the style file;
a conversion unit, configured to convert the element layering rule into the element layering configuration file, and convert the element rendering style rule into the rendering style configuration file.
Further, the extraction module includes:
the first extraction unit is used for extracting rule rules in the style file;
a second extraction unit, configured to extract filter element hierarchical information and attribute field information associated with rendering in the rule as the element hierarchical rule;
and a third extraction unit configured to extract a rule associated with a display in the rule as the element rendering style rule.
In a third aspect, the present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method as provided in the first aspect when executing the program.
In a fourth aspect, the invention provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method as provided in the first aspect.
Drawings
FIG. 1 is a flow chart of vector map data compilation and rendering in the prior art;
fig. 2 is a flowchart of a method for generating a vector map according to an embodiment of the present invention;
FIG. 3 is a flowchart of a method for generating a vector map according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a device for generating a vector map according to an embodiment of the present invention;
fig. 5 is a schematic physical structure diagram of an electronic device according to an embodiment 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.
Fig. 2 is a flowchart of a method for generating a vector map according to an embodiment of the present invention, and as shown in fig. 2, the method includes:
and 204, rendering the target vector data based on the rendering style configuration file to obtain a vector map.
In particular, the GIS refers to a geographic information system, which is a very important spatial information system, and is a technical system for collecting, storing, managing, computing, analyzing, displaying and describing geographic distribution data in the whole or part of the earth's surface (including the atmosphere) space under the support of a computer hardware and software system.
The GIS tool is a geographic information system tool, is a universal tool platform, provides wide support for vector exchange data formats, and can meet customized compiling requirements for source data and users in different formats by means of the universal platform tool.
In the embodiment of the invention, firstly, map matching is carried out on vector map data through a GIS tool to obtain a map matching style file. Namely, the map source data in the vector exchange format is input into the GIS tool, so that the GIS tool maps the map source data, and outputs a corresponding mapping style file.
The map matching style file includes an element hierarchical configuration file and a rendering style configuration file of the vector map data. The element hierarchical configuration file is used for compiling the map matching style file, and the rendering style configuration file is used for rendering the compiled data to finally obtain the vector map.
The method for generating the vector map provided by the embodiment of the invention has the following beneficial effects:
1) the customized user requirements are completed in a diagram matching mode, and the customization and adaptation of two stages of compiling and rendering are completed based on a diagram matching result, so that what you see is what you get compiling experience is realized;
2) the threshold and difficulty of vector map data compiling are reduced, and map matching skills of a GIS tool are mastered, namely, data compiling and testing work is undertaken;
3) the compiling efficiency and the data quality are improved, the what you see is the compiling mode obtained, the possibility of errors is reduced, and the times of repeated compiling of the data are reduced;
4) the method improves the universality and compatibility of the compiling system, the GIS tool is a universal tool platform and provides wide support for vector exchange data formats, and the universal platform tool can meet the customized compiling requirements for source data in different formats and users.
Based on the content of the foregoing embodiment, as an optional embodiment, obtaining an element hierarchical configuration file and a rendering style configuration file of the vector map data based on the mapping style file includes:
exporting the layout style file to a sld format style file of ogc;
extracting element layering rules and element rendering style rules in the style file;
and converting the element layering rule into the element layering configuration file, and converting the element rendering style rule into the rendering style configuration file.
Based on the content of the foregoing embodiment, as an optional embodiment, the extracting element layering rules and element rendering style rules in the style file includes:
extracting rule rules in the style file;
extracting filter element hierarchical information and attribute field information associated with rendering in the rule to serve as the element hierarchical rule;
and extracting a rule associated with the display in the rule as the element rendering style rule.
Based on the contents of the above embodiments, as an alternative embodiment, the rule associated with the display is a textsymbolozer, pointsymbolozer, linesymbolozer, or polygonsymbolozer rule.
Based on the content of the foregoing embodiment, as an optional embodiment, compiling the layout style file based on the element hierarchical configuration file to obtain target vector data includes:
layering the elements in the layout style file according to element layering information in the element layering configuration file;
and adding attribute field information associated with rendering in the element hierarchical configuration file to a corresponding layer, and compiling to obtain the target vector data.
Based on the content of the foregoing embodiment, as an optional embodiment, the embodiment of the present invention is further specifically described with reference to the accompanying drawings for a method for generating a vector map, and fig. 3 is a flowchart of a method for generating a vector map according to another embodiment of the present invention, and as shown in fig. 3, the method includes:
1. based on a GIS tool, matching the vector map data to obtain a matching pattern file;
2. exporting the layout style file into a sld format style file of ogc;
3. extracting element layering rules and element rendering style rules in the style file;
4. converting the element layering rules into element layering configuration files, and converting the element rendering style rules into rendering style configuration files;
5. compiling the matching pattern file based on the element hierarchical configuration file to obtain target vector data;
6. and rendering the target vector data based on the rendering style configuration file to obtain the vector map.
Wherein, the element layering rule and the element rendering style rule in the extraction style file in the step 3 are specifically as follows:
extracting sld a style (sld: FeatureTypeStyle), a style name, Rule (sld: Rule) Rule and the like in the style file;
extracting the hierarchical information of the Filter (ogc: Filter) element and the attribute field information used for rendering in the Rule of 'sld: Rule', and converting the hierarchical information into a 'hierarchical configuration' file of the vector map data compiling system;
the display-related rules such as 'TextSymbolizer', 'PointSymbolizer', 'Linesymbolizer', 'PolygonSymbolizer' in 'sld-Rule' Rule are extracted and converted into 'style configuration' files of the vector map rendering engine.
Compiling the layout style file based on the element hierarchical configuration file in the step 5 to obtain target vector data, specifically:
the vector map data compiling system loads a hierarchical configuration file and stratifies elements according to element hierarchical information in the hierarchical configuration file; and adding the attribute fields related to rendering to the corresponding layers, and compiling to obtain target vector data (vector format data supported by a rendering engine).
Rendering the target vector data based on the rendering style configuration file in the step 6 to obtain a vector map, which specifically comprises the following steps:
and loading a style configuration file by the rendering engine, and rendering the compiled target vector data by using the style to obtain the vector map.
Based on the content of the foregoing embodiment, as an alternative embodiment, fig. 4 is a schematic structural diagram of an apparatus for generating a vector map according to an embodiment of the present invention, and as shown in fig. 4, the apparatus includes:
the map matching module 401 is used for matching map of the vector map data based on a GIS tool to obtain a map matching style file;
a file obtaining module 402, configured to obtain an element hierarchical configuration file and a rendering style configuration file of the vector map data based on the mapping style file;
a compiling module 403, configured to compile the layout style file based on the element hierarchical configuration file to obtain target vector data;
and a rendering module 404, configured to render the target vector data based on the rendering style configuration file to obtain a vector map.
The vector map generation device provided by the embodiment of the invention completes customized user requirements in a map matching mode, completes customization and adaptation of two stages of compiling and rendering based on a map matching result, and realizes simple and what you see is what you get compiling experience; the threshold and difficulty of vector map data compiling are reduced, and map matching skills of a GIS tool are mastered, namely, data compiling and testing work is undertaken; the compiling efficiency and the data quality are improved, and the possibility of errors and the times of repeated compiling of data are reduced through a what you see is what you get compiling mode; the method improves the universality and compatibility of the compiling system, the GIS tool is a universal tool platform and provides wide support for vector exchange data formats, and the universal platform tool can meet the customized compiling requirements for source data in different formats and users.
Based on any one of the above embodiments, the file obtaining module includes:
an export unit, configured to export the layout style file into a style file of an sld format of an ogc;
the extraction unit is used for extracting element layering rules and element rendering style rules in the style file;
a conversion unit, configured to convert the element layering rule into the element layering configuration file, and convert the element rendering style rule into the rendering style configuration file.
Based on any embodiment above, the extraction module includes:
the first extraction unit is used for extracting rule rules in the style file;
a second extraction unit, configured to extract filter element hierarchical information and attribute field information associated with rendering in the rule as the element hierarchical rule;
and a third extraction unit configured to extract a rule associated with a display in the rule as the element rendering style rule.
Fig. 5 is a schematic entity structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 5, the electronic device may include: a processor (processor)501, a communication Interface (Communications Interface)502, a memory (memory)503, and a communication bus 504, wherein the processor 501, the communication Interface 502, and the memory 503 are configured to communicate with each other via the communication bus 504. The processor 501 may call a computer program stored on the memory 503 and executable on the processor 501 to perform the method for generating the vector map provided by the above embodiments, for example, including: based on a GIS tool, matching the vector map data to obtain a matching pattern file; obtaining an element layering configuration file and a rendering style configuration file of the vector map data based on the mapping style file; compiling the mapping style file based on the element hierarchical configuration file to obtain target vector data; and rendering the target vector data based on the rendering style configuration file to obtain a vector map.
In addition, the logic instructions in the memory 503 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Embodiments of the present invention further provide a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a method for generating a vector map provided in the foregoing embodiments, and includes: based on a GIS tool, matching the vector map data to obtain a matching pattern file; obtaining an element layering configuration file and a rendering style configuration file of the vector map data based on the mapping style file; compiling the mapping style file based on the element hierarchical configuration file to obtain target vector data; and rendering the target vector data based on the rendering style configuration file to obtain a vector map.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
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 (8)
1. A method for generating a vector map, comprising:
based on a GIS tool, matching the vector map data to obtain a matching pattern file;
obtaining an element layering configuration file and a rendering style configuration file of the vector map data based on the mapping style file, wherein the element layering configuration file and the rendering style configuration file comprise: exporting the layout style file to a sld format style file of ogc; extracting element layering rules and element rendering style rules in the style file; converting the element layering rules into the element layering configuration file, and converting the element rendering style rules into the rendering style configuration file;
compiling the mapping style file based on the element hierarchical configuration file to obtain target vector data;
and rendering the target vector data based on the rendering style configuration file to obtain a vector map.
2. The method for generating a vector map according to claim 1, wherein extracting element layering rules and element rendering style rules in the style file comprises:
extracting rule rules in the style file;
extracting filter element hierarchical information and attribute field information associated with rendering in the rule to serve as the element hierarchical rule;
and extracting a rule associated with the display in the rule as the element rendering style rule.
3. The method for generating a vector map according to claim 2, wherein the rule associated with display is a textsymbolozer, a pointsymbolozer, a linesymbolozer, or a polygonsymbolozer rule.
4. The method for generating a vector map according to claim 1, wherein compiling the mapping style file based on the element hierarchical configuration file to obtain target vector data comprises:
layering the elements in the layout style file according to element layering information in the element layering configuration file;
and adding attribute field information associated with rendering in the element hierarchical configuration file to a corresponding layer, and compiling to obtain the target vector data.
5. An apparatus for generating a vector map, comprising:
the map matching module is used for matching map of the vector map data based on a GIS tool to obtain a map matching style file;
the file acquisition module is used for obtaining an element hierarchical configuration file and a rendering style configuration file of the vector map data based on the map matching style file;
the file acquisition module comprises: an export unit, configured to export the layout style file into a style file of an sld format of an ogc; the extraction unit is used for extracting element layering rules and element rendering style rules in the style file; a conversion unit, configured to convert the element layering rule into the element layering configuration file, and convert the element rendering style rule into the rendering style configuration file;
the compiling module is used for compiling the layout style file based on the element hierarchical configuration file to obtain target vector data;
and the rendering module is used for rendering the target vector data based on the rendering style configuration file to obtain a vector map.
6. The apparatus for generating a vector map according to claim 5, wherein the extraction unit includes:
the first extraction unit is used for extracting rule rules in the style file;
a second extraction unit, configured to extract filter element hierarchical information and attribute field information associated with rendering in the rule as the element hierarchical rule;
and a third extraction unit configured to extract a rule associated with a display in the rule as the element rendering style rule.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for generating a vector map according to any of claims 1 to 4 when executing the program.
8. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of a method for generating a vector map according to any one of claims 1 to 4.
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| CN113656518A (en) * | 2020-05-12 | 2021-11-16 | 奇安信科技集团股份有限公司 | Map rendering method and device, electronic equipment and storage medium |
| CN112258601B (en) * | 2020-10-19 | 2022-05-17 | 武汉中海庭数据技术有限公司 | High-precision map customized compiling method and system and electronic equipment |
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