CN111681305A - Three-dimensional field display method, device, terminal and storage medium based on GIS system - Google Patents
Three-dimensional field display method, device, terminal and storage medium based on GIS system Download PDFInfo
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Abstract
The invention relates to the technical field of big data, and provides a three-dimensional field display method based on a GIS system, which comprises the following steps: the method comprises the steps of obtaining a plurality of data sources, creating a three-dimensional field space based on the data sources, obtaining all target data points in the three-dimensional field space, calculating a concentration value of each target data point, obtaining a plurality of key target data points from all the target data points, associating a color value for each corresponding key target data point according to the concentration value of each key target data point, rendering all the target data points in the three-dimensional field space according to the key target data points and the corresponding color values, and displaying the three-dimensional field. The invention also relates to a blockchain technique, the target data point being stored in a blockchain. According to the method, the concentration value of each target data point in the created three-dimensional field space is calculated, different colors are associated with the concentration value of each key target data point, a visual and vivid field model of the three-dimensional field space is displayed to a user, and the experience degree of the user is improved.
Description
Technical Field
The invention relates to the technical field of geographic information systems, in particular to a three-dimensional field display method, a three-dimensional field display device, a three-dimensional field display terminal and a storage medium based on a GIS system.
Background
At present, the concentration display mode of a web-end GIS (Geographic Information System) System in the industry is a two-dimensional thermodynamic diagram, and the concentration display mode is represented by a series of thermodynamic value data: { x, y, value }, black and white diffusion circles are drawn on a planar canvas in such a way that the center points are diffused outward, and the overlapping portions of the circles are superimposed in gray scale, thereby displaying the density. And when each point in the area obtains a gray value in a superposition mode, a gradual color band is created, a corresponding color number is obtained according to the gray value, and when all pixels are replaced by the corresponding gray values, a two-dimensional thermodynamic diagram is presented. However, when a scene is switched to a three-dimensional scene, the data format of the thermal value data is changed to { x, y, z, value }, the form of a gradual change circle cannot be directly applied, and a planar thermodynamic diagram loses height information, cannot express the thermal value of a certain point in a space, such as the concentration of 100 meters high altitude and the concentration of 50 meters high altitude, and has no description method, so that the effect of a field model in a three-dimensional space cannot be vividly and intuitively displayed.
Disclosure of Invention
In view of the above, there is a need for a method, an apparatus, a terminal and a storage medium for displaying a three-dimensional field based on a GIS system, which can display a visual and vivid field model of the three-dimensional field space to a user by calculating a concentration value of each target data point in a created three-dimensional field space and associating different colors with the concentration value of each key target data point, thereby improving user experience.
The first aspect of the present invention provides a three-dimensional field display method based on a GIS system, the method comprising:
acquiring a plurality of data sources;
creating a three-dimensional field space based on the plurality of data sources;
acquiring all target data points contained in the three-dimensional field space;
calculating a concentration value of each of the target data points;
obtaining a plurality of key target data points from all the target data points and associating a color value for the corresponding key target data point according to the concentration value of each key target data point;
rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values;
and displaying the rendered three-dimensional field.
Preferably, the target data points are stored in a block chain, and the calculating the concentration value of each target data point includes:
calculating a distance from each of the target data points to each of the data sources;
and calculating the concentration value of each target data point according to the distance and the concentration value of each data source.
Preferably, the calculating the concentration value of each target data point according to the distance and the concentration value of each data source is obtained by adopting the following formula:
wherein point (x, y, z) represents a three-dimensional coordinate value of each of said data sources, point (x)i,yi,zi) Three-dimensional coordinate values representing the ith target data point, i represents the number of each data source, i is 0, 1, 2 …, n, n represents the number of the acquired target data points, distance represents the distance between two adjacent target data points on each side of the three-dimensional field space, k represents the thermal value influence coefficient, and value represents the distance between two adjacent target data points on each side of the three-dimensional field spaceiRepresents a density value of the ith data source, m1 represents a maximum weight value of the density value, m2 represents a minimum weight value of the density value, g represents a specific gravity, d represents a decay index of the distance, and Math.max () returns the maximum value in a set of numbers.
Preferably, the creating a three-dimensional field space based on the plurality of data sources comprises:
acquiring longitude coordinate values and latitude coordinate values of each data source;
determining the range of the first axis according to the largest longitude coordinate value of all longitude coordinate values, and determining the range of the second axis according to the largest latitude coordinate value of all latitude coordinate values;
and creating the three-dimensional field space based on the range of the first axis, the range of the second axis and the range of a preset third axis.
Preferably, the acquiring all target data points contained in the three-dimensional field space includes:
calculating the volume of the three-dimensional field space according to the range of the first axis, the range of the second axis and the range of the preset third axis;
determining the number of all target data points contained in the three-dimensional field space according to the volume and the current field density;
and determining the three-dimensional coordinate value of each target data point based on the volume of the three-dimensional field space and the number of the target data points contained in the three-dimensional field space.
Preferably, after displaying the rendered three-dimensional field, the method further comprises:
calculating the display probability of each target data point according to a concentration probability display algorithm;
and re-rendering the three-dimensional field space according to the display probability of each target data point to obtain a final three-dimensional field rendering model.
Preferably, the calculating the display probability of each target data point according to the concentration probability display algorithm is obtained by adopting the following formula:
f(x)＝(valuerate>Math.random())
wherein f (x) is a display probability; value represents a concentration value of a target data point, a value is between 0 and 1, rate represents a display probability parameter, and math.
A second aspect of the present invention provides a three-dimensional field display device based on a GIS system, the device comprising:
the first acquisition module is used for acquiring a plurality of data sources;
a creation module to create a three-dimensional field space based on the plurality of data sources;
the second acquisition module is used for acquiring all target data points contained in the three-dimensional field space;
a calculation module for calculating a concentration value of each of the target data points;
the correlation module is used for acquiring a plurality of key target data points from all the target data points and correlating a color value for the corresponding key target data point according to the concentration value of each key target data point;
the rendering module is used for rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values;
and the display module is used for displaying the rendered three-dimensional field.
A third aspect of the present invention provides a terminal comprising a processor for implementing the GIS system based three-dimensional field display method when executing a computer program stored in a memory.
A fourth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the GIS system-based three-dimensional field display method.
In summary, the three-dimensional field display method, device, terminal and storage medium based on the GIS system of the present invention obtain a plurality of data sources; creating a three-dimensional field space based on the plurality of data sources; acquiring all target data points contained in the three-dimensional field space; calculating a concentration value of each of the target data points; acquiring a plurality of key target data points from all target data points and associating a color value for the corresponding key target data point according to the concentration value of each key target data point; rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values; and displaying the rendered three-dimensional field. On one hand, the method calculates the target data points of the created three-dimensional field space, the data format of each target data point is { x, y, z, value }, the concentration value of each calculated target data point contains a height position, and the difficulty that the scene which cannot be directly applied by a two-dimensional thermodynamic diagram is switched into a three-dimensional scene due to height loss is overcome. On the other hand, the user experience is improved by acquiring key target data points from the target data points, associating different color values with the concentration value of each key target data point and finally displaying a visual and vivid field model of the three-dimensional field space to the user.
In addition, the display probability is increased for the rendering model of the three-dimensional field, the display probability of the data concentration value in the three-dimensional field is adjusted, and the display effect after the three-dimensional field is rendered is improved.
Drawings
Fig. 1 is a flowchart of a three-dimensional field display method based on a GIS system according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a three-dimensional field display device based on a GIS system according to a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a terminal according to a third embodiment of the present invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example one
Fig. 1 is a flowchart of a three-dimensional field display method based on a GIS system according to an embodiment of the present invention.
In this embodiment, the three-dimensional field display method based on the GIS system may be applied to a terminal, and for a terminal that needs to perform three-dimensional field display based on the GIS system, the three-dimensional field display function based on the GIS system provided by the method of the present invention may be directly integrated on the terminal, or may be operated in the terminal in the form of a Software Development Kit (SKD).
As shown in fig. 1, the three-dimensional field display method based on the GIS system specifically includes the following steps, and the order of the steps in the flowchart may be changed and some may be omitted according to different requirements.
S11: a plurality of data sources is acquired.
In this embodiment, the plurality of data sources are all obtained from a plurality of monitoring devices, and each monitoring device monitors one piece of data and is called a data source.
For example, to obtain a data source of PM2.5 for a city, a PM2.5 monitoring device may be installed at different locations of the city, the value of PM2.5 may be monitored by the monitoring device, and the monitored value of PM2.5 may be obtained from a plurality of PM2.5 monitoring devices.
S12: a three-dimensional field space is created based on the plurality of data sources.
In this embodiment, the data format of the data source output by each monitoring device may be { x, y, z, value }, where x represents a latitude coordinate value, y represents a longitude coordinate value, z represents an altitude coordinate value, and value represents a concentration value, and a three-dimensional field space is created according to the latitude coordinate value, the longitude coordinate value, and the altitude coordinate value of the plurality of data sources.
Preferably, the creating a three-dimensional field space based on the plurality of data sources comprises:
acquiring longitude coordinate values and latitude coordinate values of each data source;
determining the range of the first axis according to the largest longitude coordinate value of all longitude coordinate values, and determining the range of the second axis according to the largest latitude coordinate value of all latitude coordinate values;
and creating the three-dimensional field space based on the range of the first axis, the range of the second axis and the range of a preset third axis.
In this embodiment, after obtaining the longitude coordinate value and the latitude coordinate value of each data source, a rectangular plane may be determined according to the longitude coordinate value and the latitude coordinate value, an XYZ coordinate system may be established according to the rectangular plane, the upper left corner of the rectangular plane is taken as the origin of the XYZ coordinate system, the line on which the long side of the rectangular plane is located is taken as the first axis (e.g., X axis) of the XYZ coordinate system, the line on which the short side of the rectangular plane is located is taken as the second axis (e.g., Y axis) of the XYZ coordinate system, and the line perpendicular to the rectangular plane is taken as the third axis (e.g., Z axis) of the XYZ coordinate system. Determining the longitude coordinate value of the first axis in the range of 0 to the maximum, determining the latitude coordinate value of the second axis in the range of 0 to the maximum, and determining the field height of the third axis in the range of 0 to the preset field height.
The preset field height may be preset according to actual conditions, for example, the field height may be set according to the height of a cloud, or the field height may be set according to the height of the highest building in a certain city.
For example, assuming that the monitoring device has acquired 3 data sources, the data format of the 1 st data source A is ("lon": 113.898, "lat": 22.5452, 0, value1) (ii) a The data format of the 2 nd data source B is ("lon": 113.908, "lat": 22.5452, 0, value2) (ii) a The data format of the 3 rd data source C is ("lon": 113.908, "lat": 22.5502, 0, value3) A preset field height 2000m, a first axis range of 0 to 113.908 is determined, a second axis range of 0 to 22.5502 is determined, a third axis range of 0 to 2000 is determined, and a three-dimensional field space is created based on the first axis range, the second axis range, and the preset third axis range.
S13: all target data points contained within the three-dimensional field space are acquired.
In this embodiment, once the field height is predetermined, the three-dimensional field space is determined. The determined three-dimensional field space is a cube, and more target data points are considered to be uniformly distributed in the cube. It is emphasized that, to further ensure the privacy and security of the target data point, the target data point may also be stored in a node of a blockchain.
Preferably, the acquiring all target data points contained in the three-dimensional field space includes:
calculating the volume of the three-dimensional field space according to the range of the first axis, the range of the second axis and the range of the preset third axis;
determining the number of target data points contained in the three-dimensional field space according to the volume and the current field density;
and determining the three-dimensional coordinate value of each target data point based on the volume of the three-dimensional field space and the number of the target data points contained in the three-dimensional field space.
In this embodiment, the volume of the three-dimensional field space is calculated according to the maximum longitude coordinate value, the maximum latitude coordinate value and the preset field height in the three-dimensional field space.
In this embodiment, the current field density refers to a density value of the target data point in the three-dimensional field space, and the field density of each three-dimensional field space may be set according to an actual situation, or may be calculated according to the number of the historical three-dimensional field spaces and the historical target data points. The current field density can be calculated using a least squares method (also known as a least squares method) which can easily find unknown data and minimize the sum of squares of the error between these found data and the actual data. And taking the volumes of the plurality of historical three-dimensional field spaces, the corresponding historical field densities and the number of the historical target data points as a plurality of discrete target data points, and performing curve fitting on the plurality of discrete target data points by using a least square method to obtain a fitting function. And finally, inputting the volume of the three-dimensional field space and the number of target data points contained in the three-dimensional field space into the fitting function to obtain the current field density.
The least squares curve fitting is prior art and the invention is not described in detail herein.
In the embodiment, the current field density is calculated through least square curve fitting, one field density is determined as the current field density without presetting different field densities for multiple times, the appropriate field density is determined rapidly, and the efficiency of calculating the number of target data points contained in the three-dimensional field space is improved.
S14: a concentration value is calculated for each of the target data points.
In this embodiment, the three-dimensional field space includes a plurality of target data points, different target data points are at different positions of the three-dimensional field space, and a concentration value represented by each position is different.
Preferably, the calculating the concentration value of each target data point includes:
calculating a distance from each of the target data points to each of the data sources;
and calculating the concentration value of each target data point according to the distance and the concentration value of each data source.
In this embodiment, each target data point in the three-dimensional field space has a density value, and the density value of each target data point is determined according to the distance from the target data point to each data source and the density value of each data source. In this way, each target data point not only has a concentration value W, but also has three-dimensional coordinate values (x, y, z, value), so that the effect of directly applying the two-dimensional thermodynamic diagram to the three-dimensional field can be achieved.
Specifically, the concentration value of each target data point is calculated using the following formula (1):
wherein point (x, y, z) represents a three-dimensional coordinate value of each of said data sources, point (x)i,yi,zi) Three-dimensional coordinate values representing the ith target data point, i represents the number of each data source, i is 0, 1, 2 …, n, n represents the number of the acquired target data points, distance represents the distance between two adjacent target data points on each side of the three-dimensional field space, and k represents the influence system of the thermal force valueNumber, valueiRepresents a density value of the ith data source, m1 represents a maximum weight value of the density value, m2 represents a minimum weight value of the density value, g represents a specific gravity, d represents a decay index of the distance, and Math.max () returns the maximum value in a set of numbers.
In this embodiment, since the data format of each target data point is { x, y, z, value }, the calculated concentration value of each target data point includes a height position, and the difficulty that a scene that cannot be directly applied with a two-dimensional thermodynamic diagram is switched to a three-dimensional scene due to height loss is overcome.
S15: obtaining a plurality of key target data points from all the target data points and associating a color value for the corresponding key target data point according to the concentration value of each key target data point.
In this embodiment, the three-dimensional field space with different gradient color values can be displayed according to the user or the actual requirement, and as the gradient is adopted, the start color value and the end color value need to be set, a plurality of color values can be added in the middle, each color value can be set to an offset reference value, and the reference value of each offset is a floating point value with a range from 0 to 1.
For example, when a three-dimensional field space transitioning from white to black is desired to be displayed, the amount of shift of the gradation start point may be set to 0, the corresponding color may be white, the amount of shift of the gradation end point may be set to 1, and the corresponding color may be black. Therefore, a target data point with a concentration value of 0 is obtained from all the target data points and is used as a first key target data point, and the associated color is white; and acquiring a target data point with the concentration value of 1 as a second key target data point, wherein the associated color is black.
For another example, when a three-dimensional field space from blue to green to red is to be displayed, the offset of the gradual change starting point can be set to be 0, and the corresponding color is blue; setting the offset of the gradual change second point to be 0.5, wherein the corresponding color is green; setting the offset of the gradual change third point to be 0.75, wherein the corresponding color is yellow; and setting the offset of the gradual change end point to be 1, wherein the corresponding color is red. Therefore, a target data point with a concentration value of 0 is obtained from all the target data points and is used as a first key target data point, and the associated color is blue; acquiring a target data point with a concentration value of 0.5 as a second key target data point, wherein the associated color is green; acquiring a target data point with a concentration value of 0.75 as a third key target data point, wherein the associated color is yellow; and acquiring a target data point with the concentration value of 1 as a fourth key target data point, wherein the associated color is red. The three-dimensional field space of different gradient colors is displayed according to different requirements, and a plurality of key target data points are obtained, and how to set the gradient colors is not limited herein.
In this embodiment, different color values are associated with the concentration value of each key target data point, and finally, a visual and vivid field model of the three-dimensional field space is displayed to the user, so that the user experience is improved.
S16: rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values.
In this embodiment, a color value change ratio is preset, for example, a color value change ratio may be set to 0.5, the density value of each key target data point is input into a Canvas (Canvas), and the Canvas (Canvas) creates a gradient color band according to the preset color value ratio and the color value associated with the density value of each key target data point.
In this embodiment, since the gradient color band is gradually changed according to the initial color value, the end color value, and the color value change ratio, and the gradient circle in the two-dimensional thermal force field is applied mechanically in the prior art, only the concentration value of each data needs to be matched with the value in the gradient color band, and the color corresponding to the value matched as a result is rendered on the target data point of the corresponding concentration value.
S17: and displaying the rendered three-dimensional field.
In this embodiment, after rendering corresponding gradient colors on all target data points in the three-dimensional field space, a rendered three-dimensional field is obtained.
Further, after displaying the rendered three-dimensional field, the method further comprises:
calculating the display probability of each target data point according to a concentration probability display algorithm;
and re-rendering the three-dimensional field space according to the display probability of each target data point to obtain a final three-dimensional field rendering model.
In this embodiment, after the three-dimensional field is rendered, since the concentration is concentrated in the center of the three-dimensional field, and the target data points around the center are blocked by the color blocks of the central target data points, a probability display algorithm according to the concentration needs to be added, so that the higher the concentration is, the higher the probability that the corresponding target data points are displayed is.
The concentration probability display algorithm is shown in formula (2):
f(x)＝(valuerate>Math.random()) (2)
wherein f (x) is a display probability; value represents the concentration value of the target data point, and the value is between 0 and 1; for the same data point, when the concentration of the target data point is determined, the larger the display probability parameter is, the smaller the display probability is, and the smaller the display probability parameter is, the larger the display probability is; random () represents a random number between 0 and 1 generated using a random function.
Illustratively, the concentration value of the target data point a1 is 0.5 and the concentration value of the target data point a2 is 0.1. Suppose the display probability parameter rate is 1, since 0.51The probability of being greater than one random number between 0 and 1 is 50%, then the probability of the target data point a1 being displayed is 50%. And, 0.11The probability of being greater than one random number between 0 and 1 is 10%, then the probability of display of the target data point a2 is 10%. Therefore, the density value of the target data point a1 is displayed with a display probability of 50%, and the density value of the target data point a2 is displayed with a display probability of 10%.
If too many points are displayed in the obtained final three-dimensional field rendering model and the visual effect is poor, the display probability parameters can be reset. Suppose the display probability parameter rate is 2, since 0.52A probability of more than 25% of a random number between 0 and 1, thenThe display probability of the standard data point a1 is 25%. And, 0.12The probability of more than one random number between 0 and 1 is 1%, then the probability of display of the target data point a2 is 1%. Therefore, the density value of the target data point a1 is displayed with a display probability of 25%, and the density value of the target data point a2 is displayed with a display probability of 1%.
The larger the display probability is, the larger the probability of being displayed of the corresponding target data point is, that is, the larger the probability of being displayed in the three-dimensional field is, which indicates that the number of the target data points which can be displayed is larger; the smaller the display probability, the smaller the probability of the corresponding target data point being displayed, i.e., the smaller the probability of being displayed in the three-dimensional field, indicating that the fewer the number of target data points that can be displayed. The number of target data points displayed in the three-dimensional field is adjusted by continuously adjusting the display probability parameters, so that the display effect after the three-dimensional field is rendered is improved.
In summary, the three-dimensional field display method based on the GIS system of the present invention obtains a plurality of data sources; creating a three-dimensional field space based on the plurality of data sources; acquiring all target data points contained in the three-dimensional field space; calculating a concentration value of each of the target data points; acquiring a plurality of key target data points from all target data points and associating a color value for the corresponding key target data point according to the concentration value of each key target data point; rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values; and displaying the rendered three-dimensional field. On one hand, the method calculates the target data points of the created three-dimensional field space, the data format of each target data point is { x, y, z, value }, the concentration value of each calculated target data point contains a height position, and the difficulty that the scene which cannot be directly applied by a two-dimensional thermodynamic diagram is switched into a three-dimensional scene due to height loss is overcome. On the other hand, the user experience is improved by acquiring key target data points from the target data points, associating different color values with the concentration value of each key target data point and finally displaying a visual and vivid field model of the three-dimensional field space to the user.
In addition, the display probability is increased for the rendering model of the three-dimensional field, the display probability of the data concentration value in the three-dimensional field is adjusted, and the display effect after the three-dimensional field is rendered is improved.
Example two
Fig. 2 is a structural diagram of a three-dimensional field display device based on a GIS system according to a second embodiment of the present invention.
In some embodiments, the GIS system-based three-dimensional field display device 20 may include a plurality of functional modules composed of program code segments. The program codes of the respective program segments in the GIS system based three-dimensional field display device 20 may be stored in the memory of the terminal and executed by the at least one processor to perform (see fig. 1 for details) the display of the GIS system based three-dimensional field.
In this embodiment, the GIS system-based three-dimensional field display device 20 may be divided into a plurality of functional modules according to the functions performed by the device. The functional module may include: a first acquisition module 201, a creation module 202, a second acquisition module 203, a calculation module 204, an association module 205, a rendering module 206, and a display module 207. The module referred to herein is a series of computer program segments capable of being executed by at least one processor and capable of performing a fixed function and is stored in memory. In the present embodiment, the functions of the modules will be described in detail in the following embodiments.
The first obtaining module 201: for obtaining a plurality of data sources.
In this embodiment, the plurality of data sources are all obtained from a plurality of monitoring devices, and each monitoring device monitors one piece of data and is called a data source.
For example, to obtain a data source of PM2.5 for a city, a PM2.5 monitoring device may be installed at different locations of the city, the value of PM2.5 may be monitored by the monitoring device, and the monitored value of PM2.5 may be obtained from a plurality of PM2.5 monitoring devices.
The creation module 202: for creating a three-dimensional field space based on the plurality of data sources.
In this embodiment, the data format of the data source output by each monitoring device may be { x, y, z, value }, where x represents a latitude coordinate value, y represents a longitude coordinate value, z represents an altitude coordinate value, and value represents a concentration value, and a three-dimensional field space is created according to the latitude coordinate value, the longitude coordinate value, and the altitude coordinate value of the plurality of data sources.
Preferably, the creating a three-dimensional field space based on the plurality of data sources comprises:
acquiring longitude coordinate values and latitude coordinate values of each data source;
determining the range of the first axis according to the largest longitude coordinate value of all longitude coordinate values, and determining the range of the second axis according to the largest latitude coordinate value of all latitude coordinate values;
and creating the three-dimensional field space based on the range of the first axis, the range of the second axis and the range of a preset third axis.
In this embodiment, after obtaining the longitude coordinate value and the latitude coordinate value of each data source, a rectangular plane may be determined according to the longitude coordinate value and the latitude coordinate value, an XYZ coordinate system may be established according to the rectangular plane, the upper left corner of the rectangular plane is taken as the origin of the XYZ coordinate system, the line on which the long side of the rectangular plane is located is taken as the first axis (e.g., X axis) of the XYZ coordinate system, the line on which the short side of the rectangular plane is located is taken as the second axis (e.g., Y axis) of the XYZ coordinate system, and the line perpendicular to the rectangular plane is taken as the third axis (e.g., Z axis) of the XYZ coordinate system. Determining the longitude coordinate value of the first axis in the range of 0 to the maximum, determining the latitude coordinate value of the second axis in the range of 0 to the maximum, and determining the field height of the third axis in the range of 0 to the preset field height.
The preset field height may be preset according to actual conditions, for example, the field height may be set according to the height of a cloud, or the field height may be set according to the height of the highest building in a certain city.
For example, assuming that the monitoring device has acquired 3 data sources, the data format of the 1 st data source A is ("lon": 113.898, "lat": 22.5452, 0, value1) (ii) a Of the 2 nd data source BThe data format is ("lon": 113.908, "lat": 22.5452, 0, value)2) (ii) a The data format of the 3 rd data source C is ("lon": 113.908, "lat": 22.5502, 0, value3) A preset field height 2000m, a first axis range of 0 to 113.908 is determined, a second axis range of 0 to 22.5502 is determined, a third axis range of 0 to 2000 is determined, and a three-dimensional field space is created based on the first axis range, the second axis range, and the preset third axis range.
The second obtaining module 203: for acquiring all target data points contained within the three-dimensional field space.
In this embodiment, once the field height is predetermined, the three-dimensional field space is determined. The determined three-dimensional field space is a cube, and more target data points are considered to be uniformly distributed in the cube. It is emphasized that, to further ensure the privacy and security of the target data point, the target data point may also be stored in a node of a blockchain.
Preferably, the acquiring all target data points contained in the three-dimensional field space includes:
calculating the volume of the three-dimensional field space according to the range of the first axis, the range of the second axis and the range of the preset third axis;
determining the number of target data points contained in the three-dimensional field space according to the volume and the current field density;
and determining the three-dimensional coordinate value of each target data point based on the volume of the three-dimensional field space and the number of the target data points contained in the three-dimensional field space.
In this embodiment, the volume of the three-dimensional field space is calculated according to the maximum longitude coordinate value, the maximum latitude coordinate value and the preset field height in the three-dimensional field space.
In this embodiment, the current field density refers to a density value of the target data point in the three-dimensional field space, and the field density of each three-dimensional field space may be set according to an actual situation, or may be calculated according to the number of the historical three-dimensional field spaces and the historical target data points. The current field density can be calculated using a least squares method (also known as a least squares method) which can easily find unknown data and minimize the sum of squares of the error between these found data and the actual data. And taking the volumes of the plurality of historical three-dimensional field spaces, the corresponding historical field densities and the number of the historical target data points as a plurality of discrete target data points, and performing curve fitting on the plurality of discrete target data points by using a least square method to obtain a fitting function. And finally, inputting the volume of the three-dimensional field space and the number of target data points contained in the three-dimensional field space into the fitting function to obtain the current field density.
The least squares curve fitting is prior art and the invention is not described in detail herein.
In the embodiment, the current field density is calculated through least square curve fitting, one field density is determined as the current field density without presetting different field densities for multiple times, the appropriate field density is determined rapidly, and the efficiency of calculating the number of target data points contained in the three-dimensional field space is improved.
A calculation module: 204 calculate a concentration value for each of the target data points.
In this embodiment, the three-dimensional field space includes a plurality of target data points, different target data points are at different positions of the three-dimensional field space, and a concentration value represented by each position is different.
Preferably, the calculating the concentration value of each target data point includes:
calculating a distance from each of the target data points to each of the data sources;
and calculating the concentration value of each target data point according to the distance and the concentration value of each data source.
In this embodiment, each target data point in the three-dimensional field space has a density value, and the density value of each target data point is determined according to the distance from the target data point to each data source and the density value of each data source. In this way, each target data point not only has a concentration value W, but also has three-dimensional coordinate values (x, y, z, value), so that the effect of directly applying the two-dimensional thermodynamic diagram to the three-dimensional field can be achieved.
Specifically, the concentration value of each target data point is calculated using the following formula (1):
wherein point (x, y, z) represents a three-dimensional coordinate value of each of said data sources, point (x)i,yi,zi) Three-dimensional coordinate values representing the ith target data point, i represents the number of each data source, i is 0, 1, 2 …, n, n represents the number of the acquired target data points, distance represents the distance between two adjacent target data points on each side of the three-dimensional field space, k represents the thermal value influence coefficient, and value represents the distance between two adjacent target data points on each side of the three-dimensional field spaceiRepresents a density value of the ith data source, m1 represents a maximum weight value of the density value, m2 represents a minimum weight value of the density value, g represents a specific gravity, d represents a decay index of the distance, and Math.max () returns the maximum value in a set of numbers.
In this embodiment, since the data format of each target data point is { x, y, z, value }, the calculated concentration value of each target data point includes a height position, and the difficulty that a scene that cannot be directly applied with a two-dimensional thermodynamic diagram is switched to a three-dimensional scene due to height loss is overcome.
The association module 205: the method is used for acquiring a plurality of key target data points from all target data points and associating a color value for each corresponding key target data point according to the concentration value of each key target data point.
In this embodiment, the three-dimensional field space with different gradient color values can be displayed according to the user or the actual requirement, and as the gradient is adopted, the start color value and the end color value need to be set, a plurality of color values can be added in the middle, each color value can be set to an offset reference value, and the reference value of each offset is a floating point value with a range from 0 to 1.
For example, when a three-dimensional field space transitioning from white to black is desired to be displayed, the amount of shift of the gradation start point may be set to 0, the corresponding color may be white, the amount of shift of the gradation end point may be set to 1, and the corresponding color may be black. Therefore, a target data point with a concentration value of 0 is obtained from all the target data points and is used as a first key target data point, and the associated color is white; and acquiring a target data point with the concentration value of 1 as a second key target data point, wherein the associated color is black.
For another example, when a three-dimensional field space from blue to green to red is to be displayed, the offset of the gradual change starting point can be set to be 0, and the corresponding color is blue; setting the offset of the gradual change second point to be 0.5, wherein the corresponding color is green; setting the offset of the gradual change third point to be 0.75, wherein the corresponding color is yellow; and setting the offset of the gradual change end point to be 1, wherein the corresponding color is red. Therefore, a target data point with a concentration value of 0 is obtained from all the target data points and is used as a first key target data point, and the associated color is blue; acquiring a target data point with a concentration value of 0.5 as a second key target data point, wherein the associated color is green; acquiring a target data point with a concentration value of 0.75 as a third key target data point, wherein the associated color is yellow; and acquiring a target data point with the concentration value of 1 as a fourth key target data point, wherein the associated color is red. The three-dimensional field space of different gradient colors is displayed according to different requirements, and a plurality of key target data points are obtained, and how to set the gradient colors is not limited herein.
In this embodiment, different color values are associated with the concentration value of each key target data point, and finally, a visual and vivid field model of the three-dimensional field space is displayed to the user, so that the user experience is improved.
The rendering module 206: and the rendering module is used for rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values.
In this embodiment, a color value change ratio is preset, for example, a color value change ratio may be set to 0.5, the density value of each key target data point is input into a Canvas (Canvas), and the Canvas (Canvas) creates a gradient color band according to the preset color value ratio and the color value associated with the density value of each key target data point.
In this embodiment, since the gradient color band is gradually changed according to the initial color value, the end color value, and the color value change ratio, and the gradient circle in the two-dimensional thermal force field is applied mechanically in the prior art, only the concentration value of each data needs to be matched with the value in the gradient color band, and the color corresponding to the value matched as a result is rendered on the target data point of the corresponding concentration value.
The display module 207: for displaying the rendered three-dimensional field.
In this embodiment, after rendering corresponding gradient colors on all target data points in the three-dimensional field space, a rendered three-dimensional field is obtained.
Further, after the display module 207 displays the rendered three-dimensional field, the calculation module 204: the display device is also used for calculating the display probability of each target data point according to a concentration probability display algorithm;
the rendering module 206: and the three-dimensional rendering model is further used for re-rendering the three-dimensional field space according to the display probability of each target data point to obtain a final three-dimensional field rendering model.
In this embodiment, after the three-dimensional field is rendered, since the concentration is concentrated in the center of the three-dimensional field, and the target data points around the center are blocked by the color blocks of the central target data points, a probability display algorithm according to the concentration needs to be added, so that the higher the concentration is, the higher the probability that the corresponding target data points are displayed is.
The algorithm of the concentration probability display points is shown in formula (2):
f(x)＝(valuerate>Math.random()) (2)
wherein f (x) is a display probability; value represents the concentration value of the target data point, and the value is between 0 and 1; for the same data point, when the concentration of the target data point is determined, the larger the display probability parameter is, the smaller the display probability is, and the smaller the display probability parameter is, the larger the display probability is; random () represents a random number between 0 and 1 generated using a random function.
Illustratively, the concentration value of the target data point a1 is 0.5 and the concentration value of the target data point a2 is 0.1. Suppose the display probability parameter rate is 1, since 0.51The probability of being greater than one random number between 0 and 1 is 50%, then the probability of the target data point a1 being displayed is 50%. And, 0.11The probability of being greater than one random number between 0 and 1 is 10%, then the probability of display of the target data point a2 is 10%. Therefore, the density value of the target data point a1 is displayed with a display probability of 50%, and the density value of the target data point a2 is displayed with a display probability of 10%.
If too many points are displayed in the obtained final three-dimensional field rendering model and the visual effect is poor, the display probability parameters can be reset. Suppose the display probability parameter rate is 2, since 0.52The probability of being greater than one random number between 0 and 1 is 25%, then the target data point a1 is displayed with a probability of 25%. And, 0.12The probability of more than one random number between 0 and 1 is 1%, then the probability of display of the target data point a2 is 1%. Therefore, the density value of the target data point a1 is displayed with a display probability of 25%, and the density value of the target data point a2 is displayed with a display probability of 1%.
The larger the display probability is, the larger the probability of being displayed of the corresponding target data point is, that is, the larger the probability of being displayed in the three-dimensional field is, which indicates that the number of the target data points which can be displayed is larger; the smaller the display probability, the smaller the probability of the corresponding target data point being displayed, i.e., the smaller the probability of being displayed in the three-dimensional field, indicating that the fewer the number of target data points that can be displayed. The number of target data points displayed in the three-dimensional field is adjusted by continuously adjusting the display probability parameters, so that the display effect after the three-dimensional field is rendered is improved.
In summary, the three-dimensional field display device based on the GIS system of the present invention obtains a plurality of data sources; creating a three-dimensional field space based on the plurality of data sources; acquiring all target data points contained in the three-dimensional field space; calculating a concentration value of each of the target data points; acquiring a plurality of key target data points from all target data points and associating a color value for the corresponding key target data point according to the concentration value of each key target data point; rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values; and displaying the rendered three-dimensional field. On one hand, the method calculates the target data points of the created three-dimensional field space, the data format of each target data point is { x, y, z, value }, the concentration value of each calculated target data point contains a height position, and the difficulty that the scene which cannot be directly applied by a two-dimensional thermodynamic diagram is switched into a three-dimensional scene due to height loss is overcome. On the other hand, the user experience is improved by acquiring key target data points from the target data points, associating different color values with the concentration value of each key target data point and finally displaying a visual and vivid field model of the three-dimensional field space to the user.
In addition, the display probability is increased for the rendering model of the three-dimensional field, the display probability of the data concentration value in the three-dimensional field is adjusted, and the display effect after the three-dimensional field is rendered is improved.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a terminal according to a third embodiment of the present invention. In the preferred embodiment of the present invention, the terminal 3 includes a memory 31, at least one processor 32, at least one communication bus 33, and a transceiver 34.
It will be appreciated by those skilled in the art that the configuration of the terminal shown in fig. 3 is not limiting to the embodiments of the present invention, and may be a bus-type configuration or a star-type configuration, and the terminal 3 may include more or less hardware or software than those shown, or a different arrangement of components.
In some embodiments, the terminal 3 is a terminal capable of automatically performing numerical calculation and/or information processing according to preset or stored instructions, and the hardware includes but is not limited to a microprocessor, an application specific integrated circuit, a programmable gate array, a digital processor, an embedded device, and the like. The terminal 3 may further include a client device, which includes, but is not limited to, any electronic product capable of performing human-computer interaction with a client through a keyboard, a mouse, a remote controller, a touch panel, or a voice control device, for example, a personal computer, a tablet computer, a smart phone, a digital camera, and the like.
It should be noted that the terminal 3 is only an example, and other existing or future electronic products, such as those that can be adapted to the present invention, should also be included in the scope of the present invention, and are included herein by reference.
In some embodiments, the memory 31 is used for storing program codes and various data, such as the GIS system-based three-dimensional field display device 20 installed in the terminal 3, and realizes high-speed and automatic access to programs or data during the operation of the terminal 3. The Memory 31 includes a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an electronically Erasable rewritable Read-Only Memory (Electrically-Erasable Programmable Read-Only Memory (EEPROM)), an optical Read-Only Memory (CD-ROM) or other optical disk Memory, a magnetic disk Memory, a tape Memory, or any other medium readable by a computer that can be used to carry or store data.
In some embodiments, the at least one processor 32 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or may be composed of a plurality of integrated circuits packaged with the same or different functions, including one or more Central Processing Units (CPUs), microprocessors, digital Processing chips, graphics processors, and combinations of various control chips. The at least one processor 32 is a Control Unit (Control Unit) of the terminal 3, connects various components of the entire terminal 3 using various interfaces and lines, and executes various functions of the terminal 3 and processes data by running or executing programs or modules stored in the memory 31 and calling data stored in the memory 31.
In some embodiments, the at least one communication bus 33 is arranged to enable connection communication between the memory 31 and the at least one processor 32 or the like.
Although not shown, the terminal 3 may further include a power supply (such as a battery) for supplying power to various components, and preferably, the power supply may be logically connected to the at least one processor 32 through a power management device, so as to implement functions of managing charging, discharging, and power consumption through the power management device. The power supply may also include any component of one or more dc or ac power sources, recharging devices, power failure detection circuitry, power converters or inverters, power status indicators, and the like. The terminal 3 may further include various sensors, a bluetooth module, a Wi-Fi module, and the like, which are not described herein again.
It is to be understood that the described embodiments are for purposes of illustration only and that the scope of the appended claims is not limited to such structures.
The integrated unit implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a terminal, or a network device) or a processor (processor) to execute parts of the methods according to the embodiments of the present invention.
In a further embodiment, in conjunction with fig. 2, the at least one processor 32 may execute an operating device of the terminal 3 and various installed application programs (such as the GIS system-based three-dimensional field display device 20), program codes, and the like, for example, the above-mentioned modules.
The memory 31 has program code stored therein, and the at least one processor 32 can call the program code stored in the memory 31 to perform related functions. For example, the modules illustrated in fig. 2 are program codes stored in the memory 31 and executed by the at least one processor 32, so as to implement the functions of the modules for the purpose of three-dimensional field display based on the GIS system.
In one embodiment of the invention, the memory 31 stores a plurality of instructions that are executed by the at least one processor 32.
Specifically, the at least one processor 32 may refer to the description of the relevant steps in the embodiment corresponding to fig. 1, and details are not repeated here.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is only one logical functional division, and other divisions may be realized in practice.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules 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.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional module.
The block chain is a novel application mode of computer technologies such as distributed data storage, point-to-point transmission, a consensus mechanism, an encryption algorithm and the like. A block chain (Blockchain), which is essentially a decentralized database, is a series of data blocks associated by using a cryptographic method, and each data block contains information of a batch of network transactions, so as to verify the validity (anti-counterfeiting) of the information and generate a next block. The blockchain may include a blockchain underlying platform, a platform product service layer, an application service layer, and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or that the singular does not exclude the plural. A plurality of units or means recited in the apparatus claims may also be implemented by one unit or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A three-dimensional field display method based on a GIS system is characterized by comprising the following steps:
acquiring a plurality of data sources;
creating a three-dimensional field space based on the plurality of data sources;
acquiring all target data points contained in the three-dimensional field space;
calculating a concentration value of each of the target data points;
obtaining a plurality of key target data points from all the target data points and associating a color value for the corresponding key target data point according to the concentration value of each key target data point;
rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values;
and displaying the rendered three-dimensional field.
2. The GIS-system-based three-dimensional field display method of claim 1, wherein the target data points are stored in a block chain, and the calculating a concentration value of each of the target data points comprises:
calculating a distance from each of the target data points to each of the data sources;
and calculating the concentration value of each target data point according to the distance and the concentration value of each data source.
3. The GIS-system-based three-dimensional field display method according to claim 2, wherein the calculating the concentration value of each target data point according to the distance and the concentration value of each data source is obtained by using the following formula:
wherein point (x, y, z) represents a three-dimensional coordinate value of each of said data sources, point (x)i,yi,zi) Three-dimensional coordinate values representing the ith target data point, i represents the number of each data source, i is 0, 1, 2 …, n, n represents the number of the acquired target data points, distance represents the distance between two adjacent target data points on each side of the three-dimensional field space, k represents the thermal value influence coefficient, and value represents the distance between two adjacent target data points on each side of the three-dimensional field spaceiRepresents a density value of the ith data source, m1 represents a maximum weight value of the density value, m2 represents a minimum weight value of the density value, g represents a specific gravity, d represents a decay index of the distance, and Math.max () returns the maximum value in a set of numbers.
4. The GIS-system-based three-dimensional field display method according to any one of claims 1 to 3, wherein the creating a three-dimensional field space based on the plurality of data sources comprises:
acquiring longitude coordinate values and latitude coordinate values of each data source;
determining the range of the first axis according to the largest longitude coordinate value of all longitude coordinate values, and determining the range of the second axis according to the largest latitude coordinate value of all latitude coordinate values;
and creating the three-dimensional field space based on the range of the first axis, the range of the second axis and the range of a preset third axis.
5. The GIS-system-based three-dimensional field display method of claim 4, wherein the acquiring all target data points contained in the three-dimensional field space comprises:
calculating the volume of the three-dimensional field space according to the range of the first axis, the range of the second axis and the range of the preset third axis;
determining the number of target data points contained in the three-dimensional field space according to the volume and the current field density;
and determining the three-dimensional coordinate value of each target data point based on the volume of the three-dimensional field space and the number of the target data points contained in the three-dimensional field space.
6. The GIS system based three-dimensional field display method of claim 5, wherein after displaying the rendered three-dimensional field, the GIS system based three-dimensional field display method further comprises:
calculating the display probability of each target data point according to a concentration probability display algorithm;
and re-rendering the three-dimensional field space according to the display probability of each target data point to obtain a final three-dimensional field rendering model.
7. The GIS system-based three-dimensional field display method according to claim 6, wherein the calculating of the display probability of each target data point according to the concentration probability display algorithm is calculated by using the following formula:
f(x)＝(valuerate>Math.random())
wherein f (x) is a display probability; value represents a concentration value of a target data point, a value is between 0 and 1, rate represents a display probability parameter, and math.
8. A three-dimensional field display device based on a GIS system, characterized in that the three-dimensional field display device based on the GIS system comprises:
the first acquisition module is used for acquiring a plurality of data sources;
a creation module to create a three-dimensional field space based on the plurality of data sources;
the second acquisition module is used for acquiring all target data points contained in the three-dimensional field space;
a calculation module for calculating a concentration value of each of the target data points;
the correlation module is used for acquiring a plurality of key target data points from all the target data points and correlating a color value for the corresponding key target data point according to the concentration value of each key target data point;
the rendering module is used for rendering all target data points in the three-dimensional field space according to the plurality of key target data points and the corresponding color values;
and the display module is used for displaying the rendered three-dimensional field.
9. A terminal, characterized in that the terminal comprises a processor for implementing the method for displaying a three-dimensional field based on a GIS system according to any one of claims 1 to 7 when executing a computer program stored in a memory.
10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the GIS system-based three-dimensional field display method according to any one of claims 1 to 7.
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