CN113160344A - Thematic map generation method and device based on front-end map visualization platform - Google Patents
Thematic map generation method and device based on front-end map visualization platform Download PDFInfo
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Abstract
A thematic map generation method and device based on a front-end map visualization platform belong to the field of remote sensing technology application, and are characterized by comprising the following steps: firstly, calling a thematic map style file to generate a thematic map template; adding the vector data of the attention area to a visualization platform for thematic map display; drawing a vector frame of the attention area through a visualization platform; extracting map image data of the attention area; filling the map image data of the attention area and the vector geographic element distribution characteristics included in the vector data of the attention area into the thematic map template to form an initial attention area thematic map; editing thematic map attribute information of the thematic map of the initial attention area to obtain a thematic map of the attention area; the simple thematic map is produced simply and quickly in a fusion mode, operation of general non-geographic information professional platform users is facilitated, and the users of the common webgis platform can be helped to rapidly map geographic information of the concerned area.
Description
Technical Field
The invention belongs to the field of remote sensing technology application, and particularly relates to a thematic map generation method and device based on a front-end map visualization platform.
Background
With the development of geographic information system technology, geographic information technology is gradually applied to various aspects such as disaster relief, petroleum pipeline inspection, pollution monitoring, financial investment decision analysis and the like, information management or development platforms applying geographic information visualization technology for various industries are increasing day by day, economic production and living activities are greatly served, and at present, technology providing schemes which are friendly to general users and are specific to non-geographic information practitioners are concentrated in the field of visualization of the front end of webgis maps. The geographic image data and part of vector data carrying certain geographic element characteristics are displayed in a superposition mode, and certain element geographic distribution characteristics concerned by a platform user are extracted through geographic information technologies such as space analysis, buffer area analysis, spatial attribute query and the like, so that decision analysis in production or other economic activities is facilitated.
However, in the using process of the webgis platform, a user often needs to analyze the result of geographic information of a certain interested area, and the result is converted into a simple thematic map with uncomplicated requirements in a simpler and more convenient manner, so that the result is exported. However, the generation of the thematic map is still mature in the customized development of the desktop or the server, and is professional and tedious, so that the generation of the thematic map is inconvenient for non-professionals.
Disclosure of Invention
The invention aims to solve the problems that thematic maps are difficult to generate rapidly on the conventional geographic information front-end visualization platform and the requirements of the thematic maps are strict, and provides a thematic map generation method and a thematic map generation device based on the front-end map visualization platform.
In a first aspect, the present invention provides a thematic map generation method based on a front-end map visualization platform, including: firstly, calling a thematic map style file to generate a thematic map template;
adding the vector data of the attention area to a visualization platform for thematic map display;
drawing a vector frame of the attention area through a visualization platform;
extracting map image data of the attention area; extracting vector geographic element distribution characteristics included in vector data of the attention area;
filling the map image data of the attention area and the vector geographic element distribution characteristics included in the vector data of the attention area into the thematic map template to form an initial attention area thematic map;
editing thematic map attribute information of the thematic map of the initial attention area to obtain a thematic map of the attention area;
and (5) carrying out format conversion on the thematic map of the concerned area and then exporting the thematic map to finish thematic map generation.
Further, according to the thematic map generation method based on the front-end map visualization platform, the thematic map template calls the thematic map style file to automatically generate the thematic map style file.
Further, in the thematic map generation method based on the front-end map visualization platform, the thematic map attribute information includes the map name of the thematic map of the attention area and thematic map brief introduction information.
Further, according to the thematic map generation method based on the front-end map visualization platform, the formats of the thematic map of the concerned area comprise png and jpg formats.
Further, according to the thematic map generation method based on the front-end map visualization platform, vector data of the concerned area is in a geojson format; and the webgl technology is adopted for the vector geographic element distribution characteristics included in the map image data and the vector data of the extracted attention area.
In a second aspect, the present invention provides a thematic map generating device based on a front-end map visualization platform, including: the template generating module is used for calling the thematic map style file to generate a thematic map template;
the vector range determining module is used for adding the vector data of the attention area to a visualization platform for thematic map display; drawing a vector frame of the attention area through a visualization platform;
the extraction module is used for extracting map image data of the concerned area; extracting vector geographic element distribution characteristics included in vector data of the attention area;
a filling module, configured to fill the map image data of the attention area and the vector geographic element distribution features included in the vector data of the attention area into the thematic map template to form an initial attention area thematic map;
the conversion module is used for editing thematic map attribute information of the thematic map of the initial attention area to obtain the thematic map of the attention area; and (5) carrying out format conversion on the thematic map of the concerned area and then exporting the thematic map to finish thematic map generation.
In a third aspect, the present invention provides an electronic device for generating thematic map based on a front-end map visualization platform, comprising a memory and a processor; the memory for storing a computer program; the processor is configured to, when executing the computer program, implement the thematic map generation method based on the front-end map visualization platform according to the first aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the thematic map generation method based on a front-end map visualization platform according to the first aspect is implemented.
According to the thematic map generation method and device based on the front-end map visualization platform, a thematic map template is generated in advance on the front-end geographical visualization platform, image data are extracted in a modularized mode step by step, and a simple thematic map is produced in a simple and rapid fusion mode.
Drawings
Fig. 1 is a schematic flow chart of a thematic map generation method based on a front-end map visualization platform according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a result of a thematic map generation method based on a front-end map visualization platform according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a thematic map generation apparatus based on a front-end map visualization platform according to an embodiment of the present invention.
Detailed Description
The method and the device for generating the thematic map based on the front-end map visualization platform according to the present invention are described in detail with reference to the accompanying drawings and embodiments.
Example one
In the thematic map generation method based on the front-end map visualization platform, a thematic map style configuration file api (file type js) is called first to generate a thematic map template, and a default style is generally adopted; adding the vector data of the attention area to a visualization platform for thematic map display; drawing a vector frame of the attention area through a visualization platform; calling a thematic map template generated by the thematic map style file api; extracting map image data of the attention area; extracting vector geographic element distribution characteristics included in vector data of the attention area; filling the map image data of the attention area and the vector geographic element distribution characteristics included in the vector data of the attention area into the thematic map template to form an initial attention area thematic map; editing thematic map attribute information of the thematic map of the initial attention area to obtain a thematic map of the attention area; and (5) carrying out format conversion on the thematic map of the concerned area and then exporting the thematic map to finish thematic map generation.
In the embodiment of the disclosure, a front-end visualization API component ceium is selected for description, and the front-end visualization API component ceium can also be applied to platforms of other different map visualization components in practical application; as shown in fig. 1, the method specifically comprises the following steps:
the first step is as follows: preparing a set of open source map image tile data, such as google images, sky maps, and the like, and preparing vector data in a geojson format of chinese administrative boundary distribution, wherein the chinese administrative boundary distribution is used as a region of interest in the embodiment;
the second step is that: establishing a map server, and publishing map image tile data into a map data service according with an ogc standard by using open source map service publisher software such as a geoserver and the like according with the OpenGIS Web server specification, so that the front-end visual API (application program interface) access calling is facilitated;
the third step: building a map visualization platform based on vue + cecum;
the fourth step: adding a remote sensing image service; meanwhile, additionally adding Chinese administrative boundary distribution vectorization data;
the fifth step: drawing a vector frame of the attention area;
and a sixth step: extracting geographical image data and vector geographical element distribution characteristics of an attention area based on a webgl technology, and filling the characteristics into a prepared thematic map template (the template calls thematic map style configuration to automatically generate);
the seventh step: modifying the names of the thematic maps in the initial attention area, accompanying description of the thematic maps, etc
Eighth step: outcome derivation, converting the area of interest thematic map to png outcome derivation (canvas. todataurl ("image/png")) based on canvas component properties, generating a thematic map as shown in fig. 2.
In the above step, the sixth step includes: 1) extracting map contents in a drawing range to fill a template clipcanvas.getcontext ('2d'). drawImage (at.printcanvas dom, at.start _ x, at.start _ y, at.area _ width, at.area _ height, 0, 0, at.area _ width, and at.area _ height);
2) extracting a current map scale resolution filling template based on webgl;
3) generate a legend based on canvas + webgl (ctx. fillstyle = item. color; ctx. fillrect (0, 25 index, 30, 20); ctx. stroketext (item. label, 30, 25+25 index-10);)
According to the embodiment of the invention, on the front-end geographic visualization platform, thematic map templates are generated in advance, image data, thematic map elements such as a scale, a legend and a picture name are extracted in a modularized mode step by step to be filled and covered, and finally, the thematic map elements are converted into png and jpg format results based on canvas component characteristics to be exported, so that simple thematic map production and rapid platform analysis result plotting are realized.
Example two
In another embodiment of the present disclosure, as shown in fig. 3, the thematic map generating apparatus based on the front-end map visualization platform includes a template generating module, configured to invoke a thematic map style file to generate a thematic map template;
the vector range determining module is used for adding the vector data of the attention area to a visualization platform for thematic map display; drawing a vector frame of the attention area through a visualization platform;
the extraction module is used for extracting map image data of the concerned area; extracting vector geographic element distribution characteristics included in vector data of the attention area;
a filling module, configured to fill the map image data of the attention area and the vector geographic element distribution features included in the vector data of the attention area into the thematic map template to form an initial attention area thematic map;
the conversion module is used for editing thematic map attribute information of the thematic map of the initial attention area to obtain the thematic map of the attention area; and (5) carrying out format conversion on the thematic map of the concerned area and then exporting the thematic map to finish thematic map generation.
EXAMPLE III
The thematic map generation electronic device based on the front-end map visualization platform comprises a memory and a processor; the memory for storing a computer program; the processor is configured to, when executing the computer program, enable a computer to execute the thematic map generation method based on the front-end map visualization platform in the first embodiment, where specific generation steps are the same as those in the first embodiment and are not described again.
Example four
Another specific embodiment of the present disclosure is a computer-readable medium, where a program code is stored in the computer-readable medium, and when the program code runs on a computer, the computer is enabled to execute the thematic map generation method based on a front-end map visualization platform in the first embodiment, where specific generation steps are the same as those in the first embodiment, and are not described again.
The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium. The computer readable storage medium may be any available medium that can be read by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., Digital Versatile Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others. The software formed by the computer stored code can be located in the storage media mature in the field of random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, etc.
The functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A thematic map generation method based on a front-end map visualization platform is characterized by comprising the following steps:
firstly, calling a thematic map style file to generate a thematic map template;
adding the vector data of the attention area to a visualization platform for thematic map display;
drawing a vector frame of the attention area through a visualization platform;
extracting map image data of the attention area; extracting vector geographic element distribution characteristics included in vector data of the attention area;
filling the map image data of the attention area and the vector geographic element distribution characteristics included in the vector data of the attention area into the thematic map template to form an initial attention area thematic map;
editing thematic map attribute information of the thematic map of the initial attention area to obtain a thematic map of the attention area;
and (5) carrying out format conversion on the thematic map of the concerned area and then exporting the thematic map to finish thematic map generation.
2. The thematic map generation method based on the front-end map visualization platform as claimed in claim 1, wherein: and the thematic map template calls a thematic map style file to automatically generate.
3. The thematic map generation method based on the front-end map visualization platform as claimed in claim 2, wherein: the thematic map attribute information comprises a map name of a thematic map of an attention area and thematic map profile information.
4. The thematic map generation method based on the front-end map visualization platform as claimed in claim 3, wherein: the formats of the area of interest thematic map include png and jpg formats.
5. The thematic map generation method based on the front-end map visualization platform as claimed in claim 1 or 4, wherein: vector data of the attention area adopts a geojson format; and the webgl technology is adopted for the vector geographic element distribution characteristics included in the map image data and the vector data of the extracted attention area.
6. A thematic map generation device based on a front-end map visualization platform is characterized by comprising:
the template generating module is used for calling the thematic map style file to generate a thematic map template;
the vector range determining module is used for adding the vector data of the attention area to a visualization platform for thematic map display; drawing a vector frame of the attention area through a visualization platform;
the extraction module is used for extracting map image data of the concerned area; extracting vector geographic element distribution characteristics included in vector data of the attention area;
a filling module, configured to fill the map image data of the attention area and the vector geographic element distribution features included in the vector data of the attention area into the thematic map template to form an initial attention area thematic map;
the conversion module is used for editing thematic map attribute information of the thematic map of the initial attention area to obtain the thematic map of the attention area; and (5) carrying out format conversion on the thematic map of the concerned area and then exporting the thematic map to finish thematic map generation.
7. The utility model provides a thematic map generates electron device based on visual platform of front end map which characterized in that: comprising a memory and a processor; the memory for storing a computer program; the processor, when executing the computer program, is configured to implement the thematic map generation method based on the front-end map visualization platform according to any one of claims 1 to 5.
8. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, implements the thematic map generation method based on a front-end map visualization platform according to any one of claims 1 to 5.
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