CN115237862A - KML file-based map visual display method and device - Google Patents
KML file-based map visual display method and device Download PDFInfo
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- CN115237862A CN115237862A CN202211050395.7A CN202211050395A CN115237862A CN 115237862 A CN115237862 A CN 115237862A CN 202211050395 A CN202211050395 A CN 202211050395A CN 115237862 A CN115237862 A CN 115237862A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/16—File or folder operations, e.g. details of user interfaces specifically adapted to file systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/17—Details of further file system functions
- G06F16/178—Techniques for file synchronisation in file systems
- G06F16/1794—Details of file format conversion
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/29—Geographical information databases
Abstract
The invention relates to the field of traffic engineering and engineering investigation, in particular to a KML file-based map visual display method and device. The method comprises the steps of downloading and analyzing geometric objects contained in a KML file at a mobile terminal, splitting the KML file into a plurality of standardized GeoJSON files, and then loading the plurality of standardized GeoJSON files into a map for display at the same time, namely, splitting a large KML file into standard universal GeoJSON small files for asynchronous loading and displaying, so that the problem that a GIS platform cannot be directly loaded when a single KML file exceeds a certain size is solved, and the problem that the mobile terminal is stuck when a large KML file is loaded on the map of the mobile terminal is also solved.
Description
Technical Field
The invention relates to the field of traffic engineering and engineering investigation, in particular to a KML file-based map visual display method and device.
Background
At present, when surveying personnel carry out field investigation in the field, the situation is often lost or dangerous because of the complex topography, and how to help surveying personnel to carry out field investigation quickly and safely becomes an important topic. The existing survey method is that surveying personnel usually carry a pile of thick route drawings to help the field survey. However, the following problems exist in the route drawings using paper: 1. the geographical information which can be reflected by the paper drawing is limited; 2. the map information of the paper drawing is not updated timely, and the latest map information cannot be acquired; 3. in the field survey, the originally planned survey route is changed frequently, and at the moment, a surveying and mapping person carries a printed drawing out, so that the paper drawing cannot reflect the latest survey route.
CN105786954 granted as chinese invention patent assists the collection of field data by storing intersection point file information in KML file, and then combining with existing topographic map on intelligent terminal. However, the scheme has the following six defects: 1, the intersection point file contains less geographic information and cannot meet the requirement of the whole field investigation; 2, when the KML file exceeds a certain size, the GIS platform cannot be directly loaded; 3, when a large KML file is loaded on a map of the mobile terminal, a mobile phone pause phenomenon can be caused; 4, because KML files have more sources and various file contents, standardized and normalized display cannot be realized when the KML files are displayed on a map of a mobile terminal; 5, the KML file can only be opened locally on a map of the mobile terminal, and the latest KML file containing geographic information cannot be acquired in real time; 6, the KML file can only be viewed on a map of the mobile terminal, and cannot be modified on the map of the mobile terminal according to actual conditions to generate a new KML file.
Disclosure of Invention
The invention aims to solve the problems that a GIS platform cannot be directly loaded when a KML file exceeds a certain size and a mobile phone pause phenomenon is caused when a large KML file is loaded on a map of a mobile terminal in the prior art, and provides a KML file-based map visualization display method and device.
In order to achieve the above purpose, the invention provides the following technical scheme:
a KML file-based map visual display method comprises the following steps:
s1, downloading a KML file to a mobile terminal from a server;
s2, the KML file is split into a plurality of standardized GeoJSON files by analyzing the geometric objects contained in the KML file at the mobile terminal;
and S3, simultaneously loading the plurality of standardized GeoJSON files into a map for displaying at the mobile terminal.
The method comprises the steps of downloading and analyzing geometric objects contained in a KML file at a mobile terminal, splitting the KML file into a plurality of standardized GeoJSON files, and then loading the standardized GeoJSON files into a map for displaying at the same time, namely, splitting a large KML file into standard universal GeoJSON small files for displaying in an asynchronous loading mode, so that the problem that a GIS platform cannot be directly loaded when a single KML file exceeds a certain size is solved, and the problem that the mobile terminal is blocked when a large KML file is loaded on the map of the mobile terminal is also solved.
Further, S2 specifically includes the following steps:
s21, traversing all elements in the KML file, and searching landmark elements;
s21, when the geometric object in the landmark element contains a point or a line, splitting the point or the line into a GeoJSON file of the point or a GeoJSON file of the line.
Further, in step S21, if the size of the formed GeoJSON file of the point exceeds a threshold, averagely splitting the GeoJSON file of the point according to a preset file size; and if the size of the formed GeoJSON file of the line exceeds a threshold value, averagely splitting the GeoJSON file of the line according to a preset file size.
Preferably, the threshold is set to 10MB.
Further, the GeoJSON file contains geometric attributes and general attributes,
the geometric attributes comprise a type field and a coordinate field, wherein the type field is used for representing that the type is a point or a line; the coordinate field is used for indicating the coordinates of points, or the coordinate field is used for indicating the coordinates of points forming lines and multi-segment lines;
the general attributes comprise a name field, an identifier field and a rendering mode field; the name field is used for naming a point or a line; the identifier field is used for setting a unique identifier for the point or the line so as to facilitate the computer identification processing; the rendering mode field is used for setting the ID of the rendering mode for the point or line, and the ID of the rendering mode can be used for searching the style file and the corresponding style setting to determine the display form of the point or line.
Further, after the multiple standardized GeoJSON files are simultaneously loaded into the map for display in step S3, when the geographic information is found to be inconsistent with the site, the GeoJSON files are modified by clicking a point or a line on the map of the mobile terminal, then a new kml file is generated based on the modified GeoJSON files, and the modified GeoJSON files and the new kml file are stored in the mobile terminal or uploaded to the server.
Further, in step S3, after the plurality of standardized GeoJSON files are simultaneously loaded into a map for display, part of points or part of lines in the GeoJSON files are displayed or hidden.
Further, before downloading the KML file from the server to the mobile terminal in step S1, the following steps are performed:
(1) Acquiring a geographic information CAD file, and converting the geographic information CAD file into a KML file;
(2) And uploading the KML file to a server for storage.
Further, the specific method for converting the geographic information CAD file into the KML file in the step (1) includes converting the geographic information CAD file into the KML format at the desktop end through CAD plug-in acad2kml.
Based on the same inventive concept, the KML file-based map visual display device comprises at least one processor and a memory which is in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform any of the methods described above.
Compared with the prior art, the invention has the beneficial effects that:
1. the method comprises the steps of downloading and analyzing geometric objects contained in a KML file at a mobile terminal, splitting the KML file into a plurality of standardized GeoJSON files, and then loading the standardized GeoJSON files into a map for displaying at the same time, namely, splitting a large KML file into standard universal GeoJSON small files for displaying in an asynchronous loading mode, so that the problem that a GIS platform cannot be directly loaded when a single KML file exceeds a certain size is solved, and the problem that the mobile terminal is blocked when a large KML file is loaded on the map of the mobile terminal is also solved.
Drawings
Fig. 1 is a flow chart of a KML file-based map visualization display method.
Fig. 2 is a flowchart of a map visualization display method according to embodiment 1.
FIG. 3 is a server screenshot of uploading a KML file.
Fig. 4 is a screenshot of a mobile terminal downloading a KML file.
Fig. 5 is a screenshot of the mobile terminal that converts the KML file into the GeoJSON file.
Fig. 6 is a screenshot of a mobile terminal map loaded with a GeoJSON file.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
A map visualization display method based on KML files, as shown in FIG. 1, includes the following steps:
s1, downloading a KML file from a server to a mobile terminal;
s2, the KML file is split into a plurality of standardized GeoJSON files by analyzing the geometric objects contained in the KML file at the mobile terminal;
and S3, simultaneously loading the plurality of standardized GeoJSON files into a map for displaying at the mobile terminal.
The method comprises the steps of downloading and analyzing geometric objects contained in a KML file at a mobile terminal, splitting the KML file into a plurality of standardized GeoJSON files, and then loading the standardized GeoJSON files into a map for displaying at the same time, namely, splitting a large KML file into standard universal GeoJSON small files for displaying in an asynchronous loading mode, so that the problem that a GIS platform cannot be directly loaded when a single KML file exceeds a certain size is solved, and the problem that the mobile terminal is blocked when a large KML file is loaded on the map of the mobile terminal is also solved.
In an improved embodiment, before the KML file is downloaded from the server to the mobile terminal, the geographic information CAD file is acquired, the geographic information CAD file is converted into the KML file, and then the KML file is uploaded to the server for storage. As shown in fig. 2, the overall steps include:
a, acquiring a geographic information CAD file, and converting the geographic information CAD file into a KML file.
And B, uploading the KML file to a server for storage.
And C, downloading the KML file to the mobile terminal from the server.
And D, splitting the KML file into a plurality of standardized GeoJSON files by analyzing the geometric objects contained in the KML file at the mobile terminal.
And E, loading the plurality of standardized GeoJSON files into a map at the same time for displaying at the mobile terminal.
The geographic information CAD files in the step A include, but are not limited to intersection point files, and also include geographic information CAD files such as a road general diagram, route information, buildings, farmlands, ecological protection areas, scenic spot areas, land acquisition red lines and the like. Therefore, the invention supports various CAD files containing geographic information, has rich information sources and can meet the requirements of the whole field investigation.
One possible implementation method for converting the geographic information CAD file into the KML file comprises the step of converting the geographic information CAD file into a KML format through CAD plug-ins acad2KML.
In step B, after uploading the KML file to a server for storage, screenshot display is performed on the file at the server side as shown in fig. 3.
In step C, after downloading the KML file from the server to the mobile terminal, the file of the mobile terminal is screenshot and displayed as shown in fig. 4.
The beneficial effects brought by the execution of the steps A to C include that the converted KML formatted file is uploaded to a server for storage, and the KML file is downloaded to the mobile terminal from the server as required, so that a surveying and mapping staff can acquire the latest KML formatted file from the server at any time when carrying out field investigation, and the problems that the KML file can only be opened locally on a mobile terminal map and cannot acquire the latest KML file containing geographic information in real time in the prior art are overcome; when the survey route is planned to be changed during on-site survey, a method of carrying a paper drawing out in the prior art is abandoned, so that a surveying and mapping staff can timely obtain the latest survey route through the method, and a landmark (point or line) is displayed on a map of a mobile terminal, and the surveying and mapping method is convenient for field survey staff to use.
In the step D, the method specifically comprises the following steps:
d1, traversing all elements in the KML file, and searching landmark elements;
specifically, reading and traversing the KML file through a java programming language (on an android platform) or an object c programming language (on an ios platform); the landmark element is a PlaceMark element;
d2, when the geometric object in the landmark element contains a point or a line, splitting the point or the line into a GeoJSON file of the point or a GeoJSON file of the line;
specifically, point or Line information is extracted into a corresponding Point data container and a Line data container respectively by judging a Point/Line tag in a PlaceMark element.
In the step D2, if the size of the formed GeoJSON file of the point exceeds a threshold value, averagely splitting the GeoJSON file of the point according to a preset file size; if the size of the formed GeoJSON file of the line exceeds a threshold value, averagely splitting the GeoJSON file of the line according to a preset file size;
specifically, during average splitting, when a Point data container or a Line data container reaches a threshold value, storing data in the Point data container or the Line data container into a new GeoJson file, emptying the current Point data container or Line data container, and then continuously filling Point or Line information obtained in the process of traversing the KML file into the Point/Line data container.
Because the KML file may have format problems, for example, in coordinate data under a Point label, a plurality of spaces may appear between numbers, and when the KML file is analyzed and split, redundant spaces are removed and filled into a Point/Line data container.
The names of the generated GeoJSON files comprise file names of the KML files, and are used for distinguishing whether the GeoJSON files are from the same KML file or not; and the sequence numbers are added to the names of the GeoJSON files in the generated order, such as KML file name + Point +1.GeoJSON, KML file name + Point +2.GeoJSON, KML file name + Line +1.GeoJSON, KML file name + Line +2.GeoJSON.
When the KML file is analyzed, besides the GeoJSON file, a txt file is generated and used for storing the relation between the GeoJSON files of all points or lines, and the connection between the files and the content and data is also recorded in the txt file.
After the KML file is analyzed, judging whether the splitting of the KML file is missed or not by comparing the number of Point/LineString labels in the KML file with the number of generated GeoJSON files of GeoJSON files/lines of points.
Preferably, the threshold is set to 10MB.
According to the method and the device, the size of the GeoJSON file is limited within the threshold value, preferably within 10MB, the GeoJSON file can be rapidly loaded by the existing platform, the limitation that the size of the KML file cannot exceed 10MB when the KML file is loaded by the traditional ArcGIS platform is broken through, and the problem that the KML file directly loading the large file causes unsmooth or directly does not support opening in the prior art is avoided.
The split standardized GeoJSON file, i.e. the GeoJSON file for points or the GeoJSON file for lines, contains geometric attributes and general attributes,
the geometric attributes comprise a type field and a coordinate field, wherein the type field is used for representing that the type is a point or a line; the coordinate field is used for indicating the coordinates of points, or the coordinate field is used for indicating the coordinates of points forming lines and multi-segment lines;
the general attributes comprise a name field, an identifier field and a rendering mode field; the name field is used for naming a point or a line; the identifier field is used for setting a unique identifier for the point or the line so as to facilitate the computer identification processing; the rendering mode field is used for setting the ID of the rendering mode for the point or line, and the ID of the rendering mode can be used for searching the style file and the corresponding style setting to determine the display form of the point or line.
And D, after the step D is executed, screenshot is carried out on the GeoJSON file of the mobile terminal, and the display is shown as figure 5.
According to the invention, the KML file is converted into the standardized GeoJSON file, so that the KML files from different sources can be standardized and displayed in a standardized manner, and the problem of irregular KML display in the prior art is solved. For example, by setting the rendering mode field, reading the ID of the point or line rendering mode field, which can be used to search for additional self-defined Json style files and corresponding style settings, thereby determining the display form of the current point or line; through the Json files with the external custom patterns, a standard constraint can be well made on the point and line patterns, and therefore the problem that KML files with different original sources are displayed in an irregular mode is solved. In addition, the number and size of the used style files can be reduced by sharing the style attributes.
And step E, after the mobile terminal loads the plurality of standardized GeoJSON files into a map for display, when the geographic information is found to be inconsistent with the site, the GeoJSON files are modified by clicking a point or a line on the map of the mobile terminal, then new kml files are generated based on the modified GeoJSON files, the modified GeoJSON files and the new kml files are stored in the mobile terminal, or the modified GeoJSON files and the new kml files are uploaded to a server.
In step E, in a possible implementation manner, besides loading the multiple standardized GeoJSON files at the same time, a GeoJSON file of a point or a GeoJSON file of a line may be loaded according to a requirement.
After the step E is executed, in order to present the effect of the present invention, fig. 6 shows a mobile terminal map for loading a GeoJSON file.
According to the method of the step E, the GeoJSON file is modified on the mobile terminal according to the actual situation on site, so that a new KML file is generated, and the problems that paper drawing information is old in the prior art, and KML information in a patent publication can only be opened and used only at a client side and cannot be updated immediately are solved.
In a possible implementation method, after the step E loads the multiple standardized GeoJSON files into a map for display, part of points or part of lines in the GeoJSON files are displayed or hidden. Therefore, the mobile terminal realizes the display control of the elements such as points, lines and the like.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A KML file-based map visual display method is characterized by comprising the following steps:
s1, downloading a KML file to a mobile terminal from a server;
s2, the KML file is split into a plurality of standardized GeoJSON files by analyzing the geometric objects contained in the KML file at the mobile terminal;
and S3, simultaneously loading the plurality of standardized GeoJSON files into a map for displaying at the mobile terminal.
2. The KML file-based map visual display method as claimed in claim 1, wherein S2 specifically comprises the following steps:
s21, traversing all elements in the KML file, and searching landmark elements;
s22, when the geometric object in the landmark element contains a point or a line, splitting the point or the line into a GeoJSON file of the point or a GeoJSON file of the line.
3. The method for visually displaying the map based on the KML file according to claim 2, wherein in step S22, if the size of the formed GeoJSON file of the point exceeds a threshold, the GeoJSON file of the point is averagely split according to a preset file size; and if the size of the formed GeoJSON file of the line exceeds a threshold value, averagely splitting the GeoJSON file of the line according to a preset file size.
4. The KML file-based map visual display method of claim 3, wherein the threshold is set to 10MB.
5. The KML file-based map visualization display method of claim 2, wherein the GeoJSON file contains geometric attributes and general attributes,
the geometric attributes comprise a type field and a coordinate field, wherein the type field is used for representing that the type is a point or a line; the coordinate field is used for indicating the coordinates of points, or the coordinate field is used for indicating the coordinates of points forming a line and a multi-segment line;
the general attributes comprise a name field, an identifier field and a rendering mode field; the name field is used for naming a point or a line; the identifier field is used for setting a unique identifier for the point or the line so as to facilitate the computer identification processing; the rendering mode field is used for setting ID of a rendering mode for a point or a line, and the ID of the rendering mode can be used for searching a style file and corresponding style setting to determine the display form of the point or the line.
6. The KML file-based map visualization display method of claim 2, wherein after the step S3 loads the multiple standardized GeoJSON files into the map for display, when the geographic information is found to be not in accordance with the site, the GeoJSON files are modified by clicking a point or a line on a map of the mobile terminal, then a new KML file is generated based on the modified GeoJSON files, and the modified GeoJSON files and the new KML file are stored in the mobile terminal, or the modified GeoJSON files and the new KML file are uploaded to a server.
7. The KML file-based map visualization display method as claimed in claim 2, wherein after the step S3 loads the plurality of standardized GeoJSON files into the map for display, part of points or part of lines in the GeoJSON files are displayed or hidden.
8. The KML file-based map visual display method as claimed in any one of claims 1-7, wherein before the KML file is downloaded from the server to the mobile terminal in step S1, the following steps are performed:
(1) Acquiring a geographic information CAD file, and converting the geographic information CAD file into a KML file;
(2) And uploading the KML file to a server for storage.
9. The KML file-based Map visualization display method of claim 8, wherein the concrete method for converting the geographic information CAD file into the KML file in step (1) comprises converting the geographic information CAD file into a KML format at desktop side through CAD plug-in acad2KML.
10. A KML file-based map visual display device is characterized by comprising at least one processor and a memory which is in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-9.
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