Visual-based map mathematical foundation design method, computer device and storage medium

Abstract

The application discloses a kind of based on visual map mathematical basis design method, computer equipment and storage medium, wherein method includes following steps: S1, import the base map data of map, and input range coordinate, determine the rectangular frame range of the map to be output, obtain range base map data;S2, according to the range base map data obtained in step S1, calculate and obtain initial mathematical basis information, wherein, initial mathematical basis information includes initial map projection, initial projection parameter, initial paper size and initial scale;S3, according to the mathematical basis information obtained in step S2, the base map data of map is visualized drawing;S4, according to the demand, the map page after visualized drawing in step S3 is adjusted by operating personnel, and save adjusted mathematical basis information;S5, using the mathematical basis information adjusted in step S4, the base map data is handled, and the handled base map data is stored to be used as map data to be laid out.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cartography, in particular to a visualization-based mathematical basis design method for a map, a computer device and a storage medium. BACKGROUND

[0002] The mathematical basis of a map is the mathematical basis for determining the distribution position and geometric accuracy of geographic elements on the map, including map projection, scale, clipping, orientation, and latitude and longitude grid, and is the "basis" and "skeleton" of the map, and is the first consideration before map compilation. A rigorous mathematical basis is an important embodiment of the scientific nature and accuracy of a map, and is an important guarantee for the map to have a certain contrast and measurability. For a map, if there is no strict mathematical basis, people can only regard it as an aerial view or a landscape painting, greatly losing its function. Any map in the strict sense must have a rigorous mathematical basis to have measurability, that is, all maps are first established with a mathematical basis, and then the content elements are represented one by one on the map. Therefore, for a map, the determination of its mathematical basis is also essential.

[0003] The mathematical basis elements of a map do not exist independently, but are related to each other. The calculation of the mathematical basis of a map is complex and involves projection theory and a large number of calculation formulas, so when generating the mathematical basis, the cartographer needs to consider various problems from the production of the base map to the layout of the map, including map range adjustment, map projection selection, scale and page paper setting, etc. For example, the cartographer needs to select the appropriate map projection according to the data range, select the appropriate scale according to the paper size, and set the appropriate page paper according to the map range and scale. The traditional process requires a relatively high professional basis and mapping experience of the cartographer, and requires a large amount of manual operation, consumes human resources, and has low mapping efficiency. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a visualization-based mathematical basis design method for a map, comprising the following steps:

[0005] S1, importing the base map data of the map and inputting the range coordinates to determine the rectangular frame range of the map to be output, and obtaining the range base map data;

[0006] S2, calculating and obtaining the initial mathematical basis information according to the range base map data obtained in step S1, wherein the initial mathematical basis information includes the initial map projection, the initial projection parameter, the initial paper size and the initial scale;

[0007] S3, visualizing and drawing the base map data of the map according to the mathematical basis information obtained in step S2;

[0008] S4, the operator adjusts the map page drawn in step S3 according to the needs, and saves the adjusted mathematical basic information;

[0009] S5, using the adjusted mathematical basic information in step S4, processing the base map data, and storing the processed base map data as the map data to be typeset.

[0010] In some embodiments, step S2 specifically includes:

[0011] S21, according to the range base map data obtained in step S1, the coordinate system type, scale information and latitude and longitude range information in the current data are obtained respectively, if the scale information cannot be successfully obtained, the scale is recorded as 0;

[0012] S22, first, judge the coordinate system type obtained in step S21, if the coordinate system type is a projection coordinate system, directly enter step S24, if the coordinate system type is a geographic coordinate system, first enter step S23;

[0013] S23, according to the scale information and latitude and longitude range information obtained in step S21, determine the projection type;

[0014] S24, according to the projection type and the latitude and longitude range information obtained in step S21, determine the corresponding projection parameters, and take the initial projection parameters in the mathematical basic information, and then according to the projection type and the initial projection parameters, obtain the initial map projection in the mathematical basic information;

[0015] S25, if the scale information obtained in step S21 is not 0, directly take the scale information as the to-be-determined scale, otherwise, take the reference scale of the data symbol with the map scaling as the to-be-determined scale;

[0016] S26, according to the latitude and longitude range information obtained in step S21, the initial map projection obtained in step S24 and the to-be-determined scale obtained in step S25, calculate the corresponding paper size;

[0017] S27, if the paper size calculated in step S26 is not greater than the preset maximum paper size, take the corresponding to-be-determined scale and paper size as the initial scale and initial paper size in the mathematical basic information, otherwise, take the preset maximum paper size as the initial paper size in the mathematical basic information, and then calculate the to-be-determined scale according to the preset maximum paper size, and take the adjusted scale as the initial scale in the mathematical basic information.

[0018] In some embodiments, in step S23, the projection type is determined by the following method:

[0019] If the scale information obtained in step S21 is 0, then according to the latitude and longitude range information obtained in step S21, the data range difference of latitude and longitude is determined: if the longitude difference is greater than 350° or the latitude difference is greater than 170°, then the global equal-area polyconic projection is adopted; if the above conditions are not met and the longitude difference is greater than 6° or the latitude difference is greater than 4°, then the Mercator projection is adopted; if the above conditions are not met and the longitude difference is greater than 1.5° or the latitude difference is greater than 1°, then the Lambert projection is adopted; if the above conditions are not met, then the Gauss projection is adopted;

[0020] If the scale information obtained in step S21 is not 0, then according to the size of the denominator of the scale, the data range difference of latitude and longitude is determined: if the denominator of the scale is greater than 1000000, then the Mercator projection is adopted; if the denominator of the scale is greater than 250000 and not greater than 1000000, then the Lambert projection is adopted; if the denominator of the scale is not greater than 250000, then the Gauss projection is adopted.

[0021] In some embodiments, in step S24, the corresponding projection parameters are determined in the following manner:

[0022] If the projection type is the global equal-area polyconic projection, then the longitude of the central meridian in the projection parameters is set to 150° east;

[0023] If the projection type is the Mercator projection, then the central meridian in the projection parameters is set to the middle value of the longitude range information obtained in step S21;

[0024] If the projection type is the Lambert projection, then the central meridian in the projection parameters is set to the middle value of the longitude range information obtained in step S21, the latitude of the first standard parallel in the projection parameters is set to the minimum latitude plus a preset offset, and the latitude of the second standard parallel in the projection parameters is set to the maximum latitude minus a preset offset;

[0025] If the projection type is the Gauss projection, then the east offset value in the projection parameters is set to 500 kilometers, and the strip mode is set according to the scale.

[0026] In some embodiments, in step S21, if an error occurs when obtaining the latitude and longitude range information, then an error message is prompted and the process is ended.

[0027] In some embodiments, in step S3, when the base map data of the map is visually drawn, the layout effect display and the auxiliary information display are respectively completed, wherein the layout effect display is to visually display the version effect of the map, and the auxiliary information display is to display the corresponding auxiliary lines and auxiliary parameters.

[0028] In some embodiments, in step S1, the job personnel inputs the range coordinates by quantitatively inputting data or directly selecting on the map interface.

[0029] In some embodiments, in step S4, when the job personnel adjusts the mathematical basis information, the job personnel can quantitatively adjust the related parameters and / or directly operate on the map page to realize interactive adjustment.

[0030] Another aspect of the present application provides a computer device, comprising a processor, which, when used to execute a computer program stored in a memory, realizes the above-mentioned visual-based map mathematical basis design method.

[0031] Another aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program, when executed by a processor, realizes the above-mentioned visual-based map mathematical basis design method.

[0032] Compared with the prior art, the present application has the following beneficial effects:

[0033] The visual-based map mathematical basis design method provided by the present application integrates the map mathematical basis design, realizes the automatic setting of the mathematical basis parameters, and makes the job personnel conveniently and intuitively adjust the parameters through visual display. The present application integrates the complicated mathematical basis setting into the same interface, realizes the coordinated operation of multiple parameters such as paper size, drawing range, projection, and scale, is conducive to enhancing the drawing effect, realizes the automation of the initial setting of the mathematical basis parameters, and improves the problems of the traditional map drawing, such as the excessively high experience requirement for the drafter and the low drawing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The flowchart of the visual-based map mathematical basis design method provided by the present application;

[0035] Figure 2 The schematic diagram of importing the base map data and determining the rectangular frame range in step S1 in one specific embodiment;

[0036] Figure 3 The schematic diagram of the visual drawing in step S3 in one specific embodiment;

[0037] Figure 4 The schematic diagram of the adjustment of the job personnel in step S4 in one specific embodiment. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the following further describes how the present application is implemented in combination with the drawings and specific embodiments.

[0039] Referring to Figure 1 The present application provides a visual-based mathematical foundation design method for a map, comprising the following steps:

[0040] S1, importing base map data of the map and inputting range coordinates to determine a rectangular frame range of the map to be outputted, and obtaining range base map data;

[0041] S2, calculating and obtaining initial mathematical foundation information according to the range base map data obtained in step S1, wherein the initial mathematical foundation information at least comprises initial map projection, initial projection parameter, initial paper size and initial scale, and it can be understood that the mathematical foundation information can further comprise other related parameters;

[0042] S3, visualizing and drawing the base map data of the map according to the mathematical foundation information obtained in step S2;

[0043] S4, adjusting the map page visualized and drawn in step S3 according to requirements, and saving the adjusted mathematical foundation information;

[0044] S5, processing the base map data by using the adjusted mathematical foundation information in step S4, and storing the processed base map data as map data to be laid out.

[0045] Further, step S2 specifically comprises:

[0046] S21, obtaining coordinate system type, scale information and latitude and longitude range information in the current data according to the range base map data obtained in step S1, and if the scale information cannot be successfully obtained, the scale is recorded as 0;

[0047] S22, judging the coordinate system type obtained in step S21, if the coordinate system type is a projection coordinate system, directly entering step S24, and if the coordinate system type is a geographic coordinate system, first entering step S23;

[0048] S23, determining the projection type according to the scale information and the latitude and longitude range information obtained in step S21;

[0049] S24, determining corresponding projection parameters according to the projection type and the latitude and longitude range information obtained in step S21, and taking the projection parameters as initial projection parameters in the mathematical foundation information, and then obtaining the initial map projection in the mathematical foundation information according to the projection type and the initial projection parameters;

[0050] S25, if the scale information obtained in step S21 is not 0, directly taking the scale information as a to-be-determined scale, otherwise, taking a reference scale of data symbols with map scaling as the to-be-determined scale.

[0051] S26, calculating the corresponding paper size according to the latitude and longitude range information obtained in step S21, the initial map projection obtained in step S24, and the to-be-determined scale obtained in step S25;

[0052] S27, if the paper size calculated in step S26 is not greater than a preset maximum paper size (for example, the maximum paper size can be set as the size corresponding to a super A0 paper, with a width of 914 mm and a height of 1292 mm), taking the corresponding to-be-determined scale and paper size as the initial scale and initial paper size in the mathematical basis information, otherwise, taking the preset maximum paper size as the initial paper size in the mathematical basis information, and then calculating the to-be-determined scale according to the preset maximum paper size, and taking the adjusted scale as the initial scale in the mathematical basis information.

[0053] Further, in step S23, the projection type is determined in the following manner:

[0054] If the scale information obtained in step S21 is 0, the data range difference of the latitude and longitude is determined according to the latitude and longitude range information obtained in step S21: if the longitude difference is greater than 350° or the latitude difference is greater than 170°, the global equidifferent parallel multi-conic projection is adopted; if the above conditions are not met, and the longitude difference is greater than 6° or the latitude difference is greater than 4°, the Mercator projection is adopted; if the above conditions are not met, and the longitude difference is greater than 1.5° or the latitude difference is greater than 1°, the Lambert projection is adopted; if none of the above conditions is met, the Gauss projection is adopted;

[0055] If the scale information obtained in step S21 is not 0, the data range difference of the latitude and longitude is determined according to the denominator of the scale: if the denominator of the scale is greater than 1000000, the Mercator projection is adopted; if the denominator of the scale is greater than 250000 and not greater than 1000000, the Lambert projection is adopted; if the denominator of the scale is not greater than 250000, the Gauss projection is adopted.

[0056] Further, in step S24, the corresponding projection parameters are determined in the following manner:

[0057] If the projection type is the global equidifferent parallel multi-conic projection, the longitude of the central meridian in the projection parameters is set to 150°E;

[0058] If the projection type is the Mercator projection, the central meridian in the projection parameters is set to the middle value of the longitude range information obtained in step S21;

[0059] If the projection type is Lambert projection, the central meridian in the projection parameters is set as the middle value of the longitude range information obtained in step S21, the latitude of the first standard parallel in the projection parameters is set as the minimum latitude plus a preset offset, and the latitude of the second standard parallel in the projection parameters is set as the maximum latitude minus the preset offset. As to the preset offset, the offset can be set as a function related to the scale denominator, so that the larger the scale denominator is, the larger the corresponding offset is. For example, the offset is 10' when the scale denominator is 250,000, the offset is 20' when the scale denominator is 500,000, and the offset is 30' when the scale denominator is 1,000,000.

[0060] If the projection type is Gauss projection, the projection east offset in the projection parameters is set as 500 kilometers, and the zoning mode is set according to the scale. For example, 3° zoning projection is adopted for a map with a scale of 1:10,000 or larger, and 6° zoning projection is adopted for other maps.

[0061] In addition, in step S21, if an error occurs when obtaining the longitude and latitude range information, an error message is prompted and the process is ended.

[0062] Further, in step S3, when the base map data of the map is visually drawn, the layout effect display and the auxiliary information display are respectively completed. The layout effect display is to visually display the layout effect of the map, so as to facilitate subsequent parameter adjustment of the operator. The auxiliary information display is to display the corresponding auxiliary lines and auxiliary parameters, so as to provide a reference for the adjustment of the map.

[0063] The drawing auxiliary information can include longitude and latitude auxiliary lines, projection recommendation lines, projection setting lines, and four-corner longitude and latitude coordinates. The four-corner longitude and latitude coordinate auxiliary display is to display the range of the map data, the projection recommendation lines and the projection setting lines are to provide the central meridian and the double-parallel information of the current layout projection, and the longitude and latitude auxiliary lines (longitude and latitude grid lines) can assist the user in adjusting the current projection parameters.

[0064] In addition, the present application can realize the interactive setting of the mathematical basic parameters by means of the GIS (Geographic Information System) visualization means, and display the effect of the final map layout, so that the cartographer can more intuitively and efficiently perform the mathematical basic design of the map.

[0065] For example, in step S1, the operator inputs the range coordinates by means of quantitative input data or interactive selection directly on the map interface.

[0066] In step S4, when the operator adjusts the mathematical basic information, the operator can quantitatively adjust the related parameters, and / or directly operate on the map page to realize interactive adjustment.

[0067] Therefore, the present application realizes the synchronous setting of the mathematical basic parameters in the two ways of quantitative setting and interactive adjustment, and avoids the excessive repeated calculation in the traditional manual parameter setting process.

[0068] Referring to Figures 2-4 In one specific embodiment, taking the selection of the Wuhan city map in the Hubei province map as an example, in the embodiment, the interactive adjustment of the operation personnel is realized by means of the GIS visualization means.

[0069] Referring to Figure 2 In step S1, the Hubei province map is imported as the base map data, the rectangular frame range of the Wuhan city can be directly selected on the page through the mouse to obtain the range base map data, and of course the rectangular frame range can also be obtained by inputting the coordinate data of the rectangular frame;

[0070] S2, according to the rectangular frame range obtained in step S1, the initial mathematical basic information is automatically calculated: in the embodiment, the coordinate system type in the base map is the projection coordinate system, and the coordinate system type does not need to be determined additionally, the initial map projection is Lambert projection, and in the embodiment, the calculated paper size is greater than the preset maximum paper size, so the initial paper size is the maximum size: super A0: 914*1292mm, and the initial map scale is adjusted to 1:195500 correspondingly.

[0071] S3, according to the mathematical basic information obtained in step S2, the Wuhan city map is visually displayed and drawn, as shown in Figure 3 The visual display and drawing includes two parts of the layout effect display and the auxiliary information display. The layout effect display is to visually display the content of the selected Wuhan city map according to the initial mathematical basic information; the auxiliary information display is to display the drawing auxiliary information on the map page according to the initial mathematical basic information, and the drawing auxiliary information includes the auxiliary lines of longitude and latitude, the projection recommendation line, the projection setting line, the longitude and latitude coordinates of the four corners, etc. At the same time, it can be seen that the right side of the interface can be directly adjusted by the operator. In addition, the initial visual display and drawing can be slightly larger than the rectangular frame range in step S1, and the rectangular frame is retained on the map page to display the area near the rectangular frame in the map.

[0072] S4, according to the drawing requirements of the Wuhan city map, the mathematical basic parameters are adjusted, and the quantitative setting can be directly adjusted on the right side or the interactive adjustment can be directly made on the map through the mouse. As shown in Figure 4 The paper size is adjusted to A0:841*1189mm, the map height is adjusted to 580mm, the map width is adjusted to 600mm, the map scale is adjusted to 1:300000, and the adjusted mathematical basic information is saved.

[0073] S5, according to the mathematical basic information determined in step S4, the base map data is cut and stored.

[0074] Subsequently, the map can be published according to the data stored in step S5.

[0075] Another aspect of the present application provides a computer device, comprising a processor, wherein the processor is configured to implement the above-mentioned map mathematical foundation design method based on visualization when executing a computer program stored in a memory.

[0076] Another aspect of the present application provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program is configured to implement the above-mentioned map mathematical foundation design method based on visualization when executed by a processor.

[0077] To sum up, the present application provides a map mathematical foundation design method based on visualization, which integrates the map mathematical foundation design, realizes automatic setting of mathematical foundation parameters, and makes the adjustment of the parameters convenient and intuitive through visual display. The present application integrates the complicated mathematical foundation setting into the same interface, realizes coordinated operation of multiple parameters such as paper size, drawing range, projection, and scale, and is beneficial to enhancing the drawing effect. The present application realizes the automation of initial setting of mathematical foundation parameters, realizes the synchronous setting of mathematical foundation parameters in two ways of quantitative setting and interactive adjustment, avoids excessive repeated calculation in the process of traditional manual parameter setting, and improves the problems of high experience requirement and low drawing efficiency of traditional cartography.

[0078] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A map mathematical foundation design method based on visualization, characterized in that, The process includes the following steps: S1. Import the base map data and input the range coordinates to determine the rectangular area of ​​the map to be output, thus obtaining the range base map data; S2. Based on the range base map data obtained in step S1, calculate and obtain the initial mathematical information, which includes the initial map projection, initial projection parameters, initial paper size, and initial scale. S3. Based on the mathematical information obtained in step S2, visualize the base map data. S4. The operator adjusts the visualized map page as needed and saves the adjusted mathematical information. S5. Using the adjusted mathematical information from step S4, process the base map data and save the processed base map data as the map data to be laid out. Step S2 specifically includes: S21. Based on the base map data obtained in step S1, obtain the coordinate system type, scale information, and latitude / longitude range information from the current data. If the scale information cannot be successfully obtained, record the scale as 0. S22. First determine the coordinate system type obtained in step S21. If the coordinate system type is a projected coordinate system, proceed directly to step S24; if the coordinate system type is a geographic coordinate system, proceed to step S23. S23. Determine the projection type based on the scale information and latitude / longitude range information obtained in step S21. S24. Based on the projection type and step S21... The latitude and longitude range information obtained in step S21 is used to determine the corresponding projection parameters, which are then used as the initial projection parameters in the mathematical foundation information. Based on the projection type and the initial projection parameters, the initial map projection in the mathematical foundation information is obtained. S25: If the scale information obtained in step S21 is not 0, it is directly used as the undetermined scale; otherwise, the reference scale with data symbols scaled with the map is used as the undetermined scale. S26: The corresponding paper size is calculated based on the latitude and longitude range information obtained in step S21, the initial map projection obtained in step S24, and the undetermined scale obtained in step S25. S27: If the paper size calculated in step S26 is not greater than the preset maximum paper size, the corresponding undetermined scale and paper size are used as the initial scale and initial paper size in the mathematical foundation information; otherwise, the preset maximum paper size is used as the initial paper size in the mathematical foundation information. The undetermined scale is then adjusted based on the preset maximum paper size, and the adjusted scale is used as the initial scale in the mathematical foundation information.

2. The visualization-based map mathematical foundation design method according to claim 1, characterized in that, In step S23, the projection type is determined as follows: If the scale information obtained in step S21 is 0, the difference in the latitude and longitude range is determined based on the latitude and longitude range information obtained in step S21: If the longitude difference is greater than 350° or the latitude difference is greater than 170°, the global equal-arithmetic parallel conic projection is used; if the above conditions are not met, and the longitude difference is greater than 6° or the latitude difference is greater than 4°, the Mercator projection is used; if the above conditions are not met, and the longitude difference is greater than 1.5° or the latitude difference is greater than 1°, the Lambert projection is used; if none of the above conditions are met, the Gaussian projection is used. If the scale information obtained in step S21 is not 0, then the difference in the data range of latitude and longitude is determined according to the size of the denominator of the scale: if the denominator of the scale is greater than 1,000,000, then Mercator projection is used; if the denominator of the scale is greater than 250,000 and not greater than 1,000,000, then Lambert projection is used; if the denominator of the scale is not greater than 250,000, then Gaussian projection is used.

3. The visualization-based map mathematical foundation design method according to claim 2, characterized in that, In step S24, the corresponding projection parameters are determined as follows: If the projection type is a global equal-difference parallel conic projection, the longitude of the central meridian in the projection parameters is set to 150° East; if the projection type is a Mercator projection, the central meridian in the projection parameters is set to the median value of the longitude range information obtained in step S21; if the projection type is a Lambert projection, the central meridian in the projection parameters is set to the median value of the longitude range information obtained in step S21, and the latitude of the first standard parallel in the projection parameters is set to the minimum latitude plus a preset offset, and the latitude of the second standard parallel in the projection parameters is set to the maximum latitude minus the preset offset; if the projection type is a Gaussian projection, the eastward deviation value in the projection parameters is set to 500 kilometers, and the zoning method is set according to the scale.

4. The visualization-based map mathematical foundation design method according to claim 1, characterized in that, In step S21, if an error occurs when obtaining latitude and longitude range information, an error message will be displayed and the process will end.

5. The visualization-based map mathematical foundation design method according to claim 1, characterized in that, In step S3, when visualizing the base map data, the layout effect display and auxiliary information display are completed respectively. The layout effect display is to intuitively visualize the version effect of the map, and the auxiliary information display is to display the corresponding auxiliary lines and auxiliary parameters.

6. The visualization-based map mathematical foundation design method according to claim 1, characterized in that, In step S1, the operator inputs the range coordinates by quantitatively inputting data or by directly selecting the range coordinates on the map interface.

7. The visualization-based map mathematical foundation design method according to claim 6, characterized in that, In step S4, when operators adjust the basic mathematical information, they can make quantitative adjustments to the relevant parameters and / or directly operate on the map page to achieve interactive adjustments.

8. A computer device, characterized in that, The computer device includes a processor, which, when executing a computer program stored in a memory, implements the visualization-based map mathematical foundation design method as described in any one of claims 1 to 7.

9. A computer-readable storage medium storing a computer program thereon, characterized in that, When the computer program is executed by the processor, it implements the visualization-based map mathematical foundation design method as described in any one of claims 1 to 7.

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