CN114708397B - Ground three-dimensional model data processing method and system for photovoltaic system installation - Google Patents
Ground three-dimensional model data processing method and system for photovoltaic system installation Download PDFInfo
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- CN114708397B CN114708397B CN202210627623.6A CN202210627623A CN114708397B CN 114708397 B CN114708397 B CN 114708397B CN 202210627623 A CN202210627623 A CN 202210627623A CN 114708397 B CN114708397 B CN 114708397B
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Abstract
The invention belongs to the technical field of three-dimensional ground modeling, and discloses a ground three-dimensional model data processing method for photovoltaic system installation, which comprises the steps of S1, establishing a three-dimensional coordinate system of a ground observed area, and acquiring coordinate values of an observation point on the ground on the three-dimensional coordinate system; s2, acquiring a two-dimensional electronic map corresponding to the observed area on the ground, establishing a plane coordinate system on the two-dimensional electronic map, and extracting coordinate values of coordinate points on the graphic outlines forming the highway area and the open area on the map; s3, based on the coordinate values of the coordinate points on the graphic outlines of the road area and the open area, searching three-dimensional coordinate points matched with the coordinate values on the three-dimensional coordinate system, and calculating the height values of the positions of the coordinate points on the graphic outlines of the road area and the open area; s4, generating a three-dimensional ground model by using a surface fitting algorithm, wherein the method for carrying out three-dimensional ground modeling has the advantages of simple and rapid modeling process and high modeling precision.
Description
Technical Field
The invention belongs to the technical field of three-dimensional ground modeling, and particularly relates to a ground three-dimensional model data processing method and system for photovoltaic system installation.
Background
With the development of the space ranging technology and the three-dimensional modeling technology, more and more modeling requirements for the three-dimensional ground appear, and higher requirements are provided for the accuracy of the three-dimensional ground modeling, particularly, when the photovoltaic system is installed, the influence of the ground height on the actual power generation amount of the photovoltaic system in use needs to be particularly noticed, and the larger the result of the ground height plus the building height is, this means that the better the capacity of the photovoltaic system to receive solar radiation, i.e. the greater the actual power production of the photovoltaic system after installation, and, therefore, before the installation of the photovoltaic system, a three-dimensional ground model within the installation area should first be established, the method can be used for more accurately estimating the actual power generation amount of the photovoltaic system in use under the condition of fully considering the influence of the ground height on the solar radiation receiving capacity of the photovoltaic system.
Disclosure of Invention
In order to solve the technical problems, the invention provides a ground three-dimensional model data processing method for photovoltaic system installation, which aims to complete three-dimensional modeling on the ground in an installation area before the installation of a photovoltaic system so as to help to select the installation position of the photovoltaic system and more accurately estimate the actual power generation amount of the photovoltaic system in use.
In order to achieve the above object, the following method for processing data of a three-dimensional ground model for installing a photovoltaic system is provided, and specifically includes the following steps:
establishing a three-dimensional coordinate system on a ground observed area, equally dividing the ground observed area into square areas with the same size according to a preset observation interval value, selecting four vertexes of each square area as observation points on the ground observed area, and simultaneously obtaining coordinate values of each observation point on the three-dimensional coordinate system;
acquiring a two-dimensional electronic map corresponding to the ground observed area, establishing a plane coordinate system on the two-dimensional electronic map, extracting all coordinate points on the graphic outline of the road area and the open area on the two-dimensional electronic map, and acquiring coordinate values of the coordinate points on the plane coordinate system;
step three, based on the coordinate values of all coordinate points on the graphic outlines of the highway area and the open area on the two-dimensional electronic map obtained in the step two, finding out the three-dimensional coordinate points matched with the coordinate points on the three-dimensional coordinate system in the step one, and further using the three-dimensional coordinate points to find out the three-dimensional coordinate points on the graphic outlines of the highway area and the open area on the two-dimensional electronic mapCalculating the height value of the position of each coordinate point on the graphic profile of the highway area and the open area by the coordinate values on the coordinate axes;
finding out a three-dimensional coordinate point matched with the three-dimensional coordinate system on the three-dimensional coordinate system in the step one, wherein the method comprises the following steps:
first, determining the three-dimensional coordinate system in step oneShaft andunit scale on axis, and coordinate system of plane in step twoShaft andproportional relationship between unit scales on axis, and determining three-dimensional coordinate system in step onePositive direction of axis, and the plane coordinate system in step twoThe numerical value of the included angle between the positive directions of the axes;
secondly, based on the coordinate values of all coordinate points on the graph outline of the highway area and the open area obtained in the second step,Calculating the corresponding coordinate point on the three-dimensional coordinate system in the step one by using a coordinate conversion formulaShaft andcoordinate values on the axis,The coordinate conversion formula is described as follows:
wherein, in the step (A),,represents the sameUnit scale on axis relative to saidThe unit scale on the axis is expanded by a multiple of a value,,represents saidUnit scale on axis relative to saidThe unit scale on the axis is expanded by a multiple of a value,,represents saidPositive direction of axis withThe numerical value of the included angle between the positive directions of the axes;
thirdly, judging the coordinate valueAnd the observation point in the step one isShaft andwhen the coordinate values on the axes are the same, taking the observation point as a three-dimensional coordinate point matched with the coordinate point on the figure outline of the highway area and the open space area in the step two on the three-dimensional coordinate system in the step one, and judging whether the coordinate value is the sameAnd the observation point in the step one isShaft andwhen the coordinate values on the axes are different, the coordinate values on the axes are obtainedMarking valueTaking the observation point which is closest to the observation point as a three-dimensional coordinate point which is matched with coordinate points on the graphic outlines of the highway area and the open area in the step two on the three-dimensional coordinate system in the step one;
and fourthly, generating a three-dimensional ground model by using a curved surface fitting algorithm according to coordinate values of coordinate points on a plane coordinate system and height values of positions of the coordinate points on the graphic outlines of the highway area and the open area on the two-dimensional electronic map corresponding to the observed area of the ground.
Compared with the prior art, the invention has the following beneficial effects:
1. the method comprises the steps of firstly establishing a three-dimensional coordinate system of a ground observed area, obtaining coordinate values of observed points on the ground in the three-dimensional coordinate system, then obtaining a two-dimensional electronic map corresponding to the ground observed area, establishing a plane coordinate system on the two-dimensional electronic map, extracting coordinate values of coordinate points on graphic outlines forming a highway area and an open space area on the map, then searching three-dimensional coordinate points matched with the coordinate points on the three-dimensional coordinate system on the basis of the coordinate values of the coordinate points on the graphic outlines of the highway area and the open space area, calculating height values of the positions of the coordinate points on the graphic outlines of the highway area and the open space area, and finally generating a three-dimensional ground model by using a curved surface fitting algorithm. When the method is used for three-dimensional ground modeling, the method has the advantages of simple and quick modeling process.
2. According to the invention, the ground positions of coordinate points on a road area and an open area which can represent the change of the height and depression state of the ground and the height values of the positions of the coordinate points are used, the modeling of the three-dimensional ground is completed before the photovoltaic system is installed, the installation position of the photovoltaic system can be selected, and the actual power generation amount of the photovoltaic system in use can be more accurately evaluated.
Drawings
FIG. 1 is a flow chart of the steps of a method for processing three-dimensional model data of a ground for installing a photovoltaic system according to the present invention;
FIG. 2 is a flowchart illustrating the steps of finding a matching three-dimensional coordinate point on a three-dimensional coordinate system according to the present invention;
fig. 3 is a composition structure diagram of a ground three-dimensional model data processing system for installing a photovoltaic system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms unless otherwise specified. These terms are only used to distinguish one element from another. For example, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script, without departing from the scope of the present application.
Referring to fig. 1, the invention provides a method for processing data of a three-dimensional ground model for installing a photovoltaic system, which is specifically realized by executing the following steps:
establishing a three-dimensional coordinate system on a ground observed area, equally dividing the ground observed area into square areas with the same size according to a preset observation interval value, selecting four vertexes of each square area as observation points on the ground observed area, and simultaneously obtaining coordinate values of each observation point on the three-dimensional coordinate system;
acquiring a two-dimensional electronic map corresponding to the observed area on the ground, establishing a plane coordinate system on the two-dimensional electronic map, extracting all coordinate points on the graphic outline of the road area and the open area on the two-dimensional electronic map, and acquiring coordinate values of the coordinate points on the plane coordinate system;
step three, based on the road area and the empty area on the two-dimensional electronic map obtained in the step twoCoordinate values of all coordinate points on the graph outline of the domain are found out in the three-dimensional coordinate system in the step one, and the three-dimensional coordinate points are matched with the coordinate values of all coordinate points on the graph outline of the domainCalculating the height value of the position of each coordinate point on the graphic profile of the highway area and the open area by the coordinate values on the coordinate axes;
and fourthly, generating a three-dimensional ground model by using a curved surface fitting algorithm according to coordinate values of coordinate points on a plane coordinate system and height values of positions of the coordinate points on the graphic outlines of the highway area and the open area on the two-dimensional electronic map corresponding to the observed area of the ground.
Further, the ground observed area in the first step specifically includes a building area, a road area and an open space area, and the process of acquiring the coordinate value of each observation point on the Z coordinate axis of the three-dimensional coordinate system in the first step specifically includes measuring height data of the position of each observation point on the ground observed area.
Specifically, the ground observed area refers to a ground area about which a three-dimensional ground model is to be built, and the ground area has an area that may cause an error influence on three-dimensional ground modeling, such as a building area, since the building itself has a certain height, when performing aerial ranging, the ranging system actually acquires height data of the top of the building, not height data of the ground, and an error inevitably occurs when performing three-dimensional ground modeling using the height data of the top of the building, and the ground area also has an area that may not cause an error influence on three-dimensional ground modeling, such as a road having a certain width, an open space not covered by the building, and a road having a certain width is not affected by the buildings on both sides, and meanders forward only with the state of high and low ground level, so that it can well show the ground, meanwhile, the open space which is not covered by the building can well show the ground, so that the influence of the building on the three-dimensional ground modeling is avoided, and therefore, if the height data of the highway area and the open space area on the observed ground area are obtained, the three-dimensional ground modeling can be completed;
when a three-dimensional coordinate system on the ground observed area is established, the central position of the ground observed area is taken as the origin of the coordinate system,the positive direction of the axis is vertically upward,shaft andthe axial direction can be freely set according to the actual situation, for example, the warp direction and the weft direction are respectively used asShaft andpositive direction of axis, with observation point on the groundShaft andthe coordinate values on the axis represent their specific position on the ground, the observation point on the ground beingThe coordinate values on the axes represent height data obtained by the aerial ranging technique at the position of the observation point.
Furthermore, before extracting each coordinate point on the figure outline forming the highway area on the two-dimensional electronic map in the step two, the method also comprises the steps of obtaining the actual highway width data of the highway area on the two-dimensional electronic map in advance, comparing the data with a highway width threshold value preset by a system, when the road width data is larger than the road width threshold value, extracting each coordinate point on the graphic outline forming the corresponding road area, and before extracting each coordinate point on the graphic outline forming the open area on the two-dimensional electronic map in the second step, also obtaining the actual floor area data of the open area on the two-dimensional electronic map in advance and comparing the floor area data with the floor area threshold value of the open area preset by the system, when the floor space data is greater than the floor space threshold, extracting each coordinate point on the graphic profile forming the corresponding floor space region.
Specifically, considering that the obtaining of the height values of the positions of the observation points on the observed area on the ground has been completed in the first step, wherein the positions of the observation points may be one point on the road or the open ground or one point on the top of the building, in order to find the observation points on the road and the open ground and further model the three-dimensional ground by the positions and the height values thereof, the second step first needs to obtain a two-dimensional electronic map corresponding to the observed area on the ground, wherein the two-dimensional electronic map describes the specific positions of the road area and the open ground area on the ground and the graphic outlines thereof in detail, and the specific positions of the points on the graphic outlines of the road area and the open ground area can be conveniently determined as long as a plane coordinate system is established on the two-dimensional electronic map, taking the central position on the two-dimensional electronic map as the origin of the coordinate system,shaft andthe direction of the axis can be freely set according to the actual situation, and the method for establishing the plane coordinate system of the two-dimensional electronic map ensures that the origin of the plane coordinate system is overlapped with the origin of the three-dimensional coordinate system in the first step, avoids the need of coordinate translation during coordinate conversion in the subsequent steps, and simplifies the steps of coordinate conversion.
Further, referring to fig. 2, finding a matching three-dimensional coordinate point on the three-dimensional coordinate system in the step one includes the following steps:
first, determining the three-dimensional coordinate system in step one respectivelyShaft andunit scale on axis and plane coordinate system in step twoShaft andproportional relationship between unit scales on axis, and determining three-dimensional coordinate system in step onePositive direction of axis, and the plane coordinate system in step twoThe numerical value of the included angle between the positive directions of the axes;
secondly, based on the coordinate values of all coordinate points on the graph outline of the highway area and the open area obtained in the second step,Calculating the corresponding coordinate point on the three-dimensional coordinate system in the step one by using a coordinate conversion formulaShaft andcoordinate values on the axis,The coordinate conversion formula is described as follows:
wherein, in the step (A),,represents saidUnit scale on axis relative to saidThe unit scale on the axis is expanded by a multiple of a value,,represents saidUnit scale on axis relative to saidThe unit scale on the axis is expanded by a multiple of a value,,represents saidThe positive direction of the axis withThe numerical value of the included angle between the positive directions of the axes;
thirdly, judging the coordinate valueAnd the observation point in the step one isShaft andwhen the coordinate values on the axes are the same, taking the observation point as a three-dimensional coordinate point matched with the coordinate point on the graph outline of the highway area and the open space area in the step two on the three-dimensional coordinate system in the step one, and judging whether the coordinate value is the sameAnd the observation point in the step one isShaft andwhen the coordinate values on the axes are different, the coordinate values are obtainedAnd taking the observation point with the nearest distance around as a three-dimensional coordinate point matched with the coordinate point on the figure outline of the highway area and the open area in the step two on the three-dimensional coordinate system in the step one.
Specifically, the coordinate transformation process can be used for the road area and the open space on the two-dimensional electronic mapCoordinate points on the graphic outline of the region find three-dimensional coordinate points matched with the ground position on the three-dimensional coordinate system of the observed region of the ground, namely observation points on the highway region and the open area can be found out from a large number of observation points in the step one, and finally the plane positions of the coordinate points on the graphic outline of the highway region and the open area on the three-dimensional coordinate system can be obtainedWherein, in the process of performing the coordinate conversion, the three-dimensional coordinate system is considered to be overlapped with the origin of the plane coordinate system and the three-dimensional coordinate systemPositive direction of axis and plane coordinate systemThere may be some included angle between the positive directions of the axes, so it is necessary to use formulasFor coordinate points on a plane coordinate systemWhile taking into account the three-dimensional coordinate systemShaft andof unit scale values on axis, with plane coordinate systemShaft andthere is also a proportional relationship between the unit scale values on the axis, becauseThis also requires that coordinate points on the planar coordinate system be aligned according to the proportional relationshipFurther performing enlargement or reduction calculation, i.e. calculatingThe result of (1) is that three-dimensional coordinate points on the three-dimensional coordinate system match coordinate points on the graphic outlines of the road area and the open areaShaft andcoordinate values on the axis。
Further, in step three, the three-dimensional coordinate point is locatedThe process of calculating the height value of the position of each coordinate point on the graphic profile of the highway region and the open space region in the coordinate axis in the second step includes judging that the three-dimensional coordinate point is located at the position of the coordinate point on the graphic profile of the highway region and the open space region in the second step when the three-dimensional coordinate point matched with the coordinate point on the graphic profile of the highway region and the open space region in the second step on the three-dimensional coordinate system in the first step is uniqueAnd taking coordinate values on the coordinate axes as the height values, and judging that the three-dimensional coordinate points are located when the three-dimensional coordinate points matched with the coordinate points on the graph outlines of the highway area and the open area in the step two are not unique in the step one three-dimensional coordinate systemAverage value of coordinate values on coordinate axesIs the height value.
Specifically, through the above-described execution steps, the plane positions of the respective coordinate points on the graphic outlines of the highway region and the open space region, and the height values of the plane positions thereof have been obtained, whereby the three-dimensional ground can be modeled based on these data.
Further, the step four is based on the plane position of each coordinate point on the graphic outline of the highway area and the open space area and the height value of the plane position, the ground surface is three-dimensionally reconstructed, the surface reconstruction is to use the discrete coordinate point data obtained by measurement to perform preprocessing and then use a proper algorithm to fit a mathematical model of the surface, the three-dimensional reconstruction of the surface, namely the surface fitting method, is many, such as Shepard method, multiquartic method, thin plate spline method, finite element method, non-uniform rational B spline method and the like, the three-dimensional ground modeling can be specifically completed by using the NURBS surface fitting algorithm, the NURBS surface has good continuity, smoothness, affine invariance, perspective invariance, local control and other excellent characteristics, and is a strong geometric tool for designing, analyzing and processing the surface modeling, therefore, the three-dimensional ground modeling is performed by using the NURBS surface fitting algorithm, has good flexibility and high precision.
Referring to fig. 3, the present invention further provides a system for processing three-dimensional model data of a ground for photovoltaic system installation, which is used to implement the method for processing three-dimensional model data of a ground for photovoltaic system installation described in the foregoing, and specifically includes the following modules:
the system comprises a first module, a second module and a third module, wherein the first module is used for establishing a three-dimensional coordinate system on a ground observed area, equally dividing the ground observed area into square areas with the same size according to a preset observation interval value, selecting four vertexes on each square area as observation points on the ground observed area, and simultaneously obtaining coordinate values of the observation points on the three-dimensional coordinate system.
And the second module is used for acquiring a two-dimensional electronic map corresponding to the observed area on the ground, establishing a plane coordinate system on the two-dimensional electronic map, extracting all coordinate points on the graphic outline of the road area and the open area on the two-dimensional electronic map, and acquiring coordinate values of the coordinate points on the plane coordinate system.
A third module, configured to find a three-dimensional coordinate point matching the coordinate point on the three-dimensional coordinate system based on the coordinate values of the coordinate points on the graphic outlines of the road area and the open area on the two-dimensional electronic map obtained in the second module, and further find the three-dimensional coordinate point on the three-dimensional coordinate system based on the coordinate values of the coordinate points on the graphic outlines of the road area and the open area on the two-dimensional electronic map obtained in the second moduleAnd calculating the height value of the position of each coordinate point on the graphic outline of the road area and the open area by the coordinate values on the coordinate axes.
And the fourth module is used for generating a three-dimensional ground model by using a surface fitting algorithm according to the coordinate values of all coordinate points on the graphic outlines of the highway area and the open area on the two-dimensional electronic map corresponding to the observed area of the ground on a plane coordinate system and the height value of the positions of the coordinate points.
It should be understood that, although the steps in the flowcharts of the embodiments of the present invention are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in various embodiments may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A ground three-dimensional model data processing method for photovoltaic system installation is characterized by comprising the following steps:
s1, establishing a three-dimensional coordinate system on the ground observed area, equally dividing the ground observed area into square areas with the same size according to a preset observation interval value, selecting four vertexes of each square area as observation points on the ground observed area, and simultaneously obtaining coordinate values of each observation point on an X coordinate axis, a Y coordinate axis and a Z coordinate axis of the three-dimensional coordinate system;
s2, acquiring a two-dimensional electronic map corresponding to the observed area on the ground, establishing a plane coordinate system on the two-dimensional electronic map, extracting coordinate points on the graphic outline of the road area and the open area on the two-dimensional electronic map, and acquiring coordinate values of the coordinate points on the plane coordinate system;
s3, based on the coordinate values of the coordinate points on the graphic profile of the highway area and the open area on the two-dimensional electronic map obtained in S2, finding out the three-dimensional coordinate points matched with the coordinate values on the three-dimensional coordinate system in S1, and calculating the height values of the positions of the coordinate points on the graphic profile of the highway area and the open area from the coordinate values of the three-dimensional coordinate points on the Z coordinate axis;
and S4, generating a three-dimensional ground model by using a surface fitting algorithm according to the coordinate values of all coordinate points on the graphic outline of the highway area and the open area on the two-dimensional electronic map corresponding to the observed area of the ground on a plane coordinate system and the height value of the positions of the coordinate points.
2. The method as claimed in claim 1, wherein the ground three-dimensional model data processing method for photovoltaic system installation comprises a building area, a road area and an open space area on the ground observed area in S1, and the step of obtaining the coordinate values of the observation points on the Z coordinate axis of the three-dimensional coordinate system in S1 comprises measuring height data of the positions of the observation points on the ground observed area.
3. The method as claimed in claim 1, wherein the step of processing the three-dimensional model data of the ground for installing the photovoltaic system comprises, before extracting the coordinates of the road region on the two-dimensional electronic map, the step of obtaining the actual road width data of the road region on the two-dimensional electronic map and comparing the actual road width data with a road width threshold preset by the system in step S2, when the road width data is greater than the road width threshold, the coordinates of the road region on the road region are extracted, and the step of obtaining the actual floor area data of the open area on the two-dimensional electronic map and comparing the actual floor area data with a floor area threshold preset by the system in step S2, when the floor area data is greater than the floor area threshold, the respective coordinate points constituting the figure outline corresponding to the open space region are extracted.
4. The method of claim 1, wherein the step of calculating the height values of the positions of the respective coordinate points on the graphic profile of the highway region and the open space region in S2 from the coordinate values of the three-dimensional coordinate points on the Z-coordinate axis in S3 comprises determining that the coordinate values of the three-dimensional coordinate points on the Z-coordinate axis are the height values when the three-dimensional coordinate points on the three-dimensional coordinate system matched with the coordinate points on the graphic profile of the highway region and the open space region in S2 are unique in S1, and determining that the average of the coordinate values of the three-dimensional coordinate points on the Z-coordinate axis is the height values when the three-dimensional coordinate points on the three-dimensional coordinate system matched with the coordinate points on the graphic profile of the highway region and the open space region in S2 are not unique in S1.
5. The method for processing the three-dimensional ground model data for photovoltaic system installation according to claim 1, wherein when the three-dimensional coordinate system on the observed region on the ground is established in S1, the center position of the observed region on the ground is taken as the origin of the three-dimensional coordinate system.
6. The method for processing the three-dimensional ground model data for photovoltaic system installation according to claim 1, wherein when the planar coordinate system on the two-dimensional electronic map corresponding to the observed area on the ground is established in S2, the central position of the two-dimensional electronic map is used as the origin of the planar coordinate system.
7. A three-dimensional model data processing system of a ground for installing a photovoltaic system, which is used for realizing the method of any one of claims 1 to 6, and is characterized by comprising the following modules:
the system comprises a first module, a second module and a third module, wherein the first module is used for establishing a three-dimensional coordinate system on a ground observed area, equally dividing the ground observed area into square areas with the same size according to a preset observation interval value, selecting four vertexes on each square area as observation points on the ground observed area, and simultaneously obtaining coordinate values of the observation points on the three-dimensional coordinate system;
the second module is used for acquiring a two-dimensional electronic map corresponding to the observed area on the ground, establishing a plane coordinate system on the two-dimensional electronic map, extracting coordinate points on the graphic outline of the road area and the open area on the two-dimensional electronic map, and acquiring coordinate values of the coordinate points on the plane coordinate system;
the third module is used for searching three-dimensional coordinate points matched with the coordinate values of the coordinate points on the graphic outlines of the highway area and the open area on the three-dimensional coordinate system based on the coordinate values of the coordinate points on the graphic outlines of the highway area and the open area on the two-dimensional electronic map obtained in the second module, and then calculating the height values of the positions of the coordinate points on the graphic outlines of the highway area and the open area according to the coordinate values of the three-dimensional coordinate points on the Z coordinate axis;
and the fourth module is used for generating a three-dimensional ground model by using a surface fitting algorithm according to the coordinate values of all coordinate points on the graphic outlines of the highway area and the open area on the two-dimensional electronic map corresponding to the observed area of the ground on a plane coordinate system and the height value of the positions of the coordinate points.
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