CN112884890A - Multi-format basic geographic information data fusion display method - Google Patents
Multi-format basic geographic information data fusion display method Download PDFInfo
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Abstract
The invention discloses a method for fusing and displaying multi-format basic geographic information data, which comprises the following steps: step S1, performing three-dimensional modeling of air-ground image fusion; step S2, performing three-dimensional modeling of low-altitude image and ground three-dimensional laser point cloud fusion; and step S3, carrying out three-dimensional modeling by fusing the low-altitude image and the three-dimensional white model. The invention takes ground camera image, low-altitude unmanned aerial vehicle image and ground three-dimensional laser point cloud data as fusion objects, researches a method for three-dimensional modeling of air-ground image fusion, low-altitude image fusion ground three-dimensional laser point cloud and low-altitude image fusion three-dimensional white mould, and comprehensively analyzes the three-dimensional modeling precision and the modeling effect to select the modeling effect picture with the highest color texture effect and geometric structure precision so as to meet the modeling requirement of a three-dimensional real scene model of a larger scene.
Description
Technical Field
The invention relates to the technical field of data fusion, in particular to a method for fusion display of multi-format basic geographic information data.
Background
The geographic information system is also commonly called as GIS, and can effectively combine various geographic positions and geographic information, present the data of the geographic positions in the form of images by using related software of a computer system, and record the whole process in detail. The geographic information system fully integrates computer multimedia technology and geographic knowledge, effectively collects, analyzes and processes various data information by utilizing a database in the computer system, and further provides reliable data support for urban planning and land resource management work in China. In recent years, with the continuous development of the economy of China, the surveying and mapping science and the technical level are continuously improved, the smart city becomes the inevitable trend, the photogrammetry technology and the three-dimensional laser scanning technology are rapidly developed, and the GIS generally adopts the multi-source data three-dimensional modeling technology to perform multi-format basic geographic information data fusion display.
In the prior art, the multi-source data three-dimensional modeling technology generally adopts independent modeling of multi-source data, which respectively comprises ground image three-dimensional modeling, low-altitude image three-dimensional modeling and ground three-dimensional laser point cloud three-dimensional modeling.
Disclosure of Invention
The invention aims to provide a method for fusion display of multi-format basic geographic information data, which aims to solve the technical problems that in the prior art, multi-source data are independently modeled, other multi-source data are not fused for modeling, multi-source data complementation is difficult to realize, and the accuracy of independent modeling of the multi-source data is low.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
a method for fusing and displaying multi-format basic geographic information data comprises the following steps:
step S1, performing three-dimensional modeling of air-ground image fusion;
step S2, performing three-dimensional modeling of low-altitude image and ground three-dimensional laser point cloud fusion;
step S3, carrying out three-dimensional modeling by fusing a low-altitude image and a three-dimensional white model;
and S4, performing comprehensive analysis on the three-dimensional modeling of the fusion of the air-ground image, the three-dimensional modeling of the fusion of the low-air image and the ground three-dimensional laser point cloud and the three-dimensional modeling of the fusion of the low-air image and the three-dimensional white model, and selecting the three-dimensional scene with the highest precision as the three-dimensional scene containing the multi-format basic geographic information to display.
As a preferred embodiment of the present invention, in the step S1, the air-ground image fusion three-dimensional modeling is a three-dimensional modeling technology with a low-altitude image as a main component and a ground image as an auxiliary component, and a key core technology thereof is image matching, and the specific method is as follows:
step S101, importing low-altitude image data into ContextCapture4.4.9 software to perform automatic aerial triangulation processing without image control points, importing ground images and performing image control point marking work on the ground images, wherein at least three marks are marked on the ground images and the low-altitude images respectively to ensure the accuracy of the marks on each image;
step S102, carrying out aerial triangulation processing on the aerial image marked with the image control point, checking an aerial triangulation processing report in real time, and checking whether the aerial triangulation processing report meets the precision requirement of three-dimensional modeling:
if yes, go to step S103;
if not, turning to step S101;
and S103, carrying out full-automatic three-dimensional live-action modeling to generate an air-ground image fusion three-dimensional modeling effect diagram.
As a preferred scheme of the present invention, in the step S2, the fused three-dimensional modeling of the low-altitude image and the ground three-dimensional laser point cloud is a three-dimensional modeling technology with the low-altitude image as a main component and the ground three-dimensional laser point cloud as an auxiliary component, and a key core technology thereof is coordinate unification, and the specific manner is as follows:
step S201, importing low-altitude image data into ContextCapture4.4.9 software to perform automatic aerial triangulation processing without image control points, importing closed ground three-dimensional laser point cloud data in a las format after the processing is completed, and then performing image control point marking work on the low-altitude image;
s202, performing aerial triangulation processing of low-altitude image and ground three-dimensional laser point cloud data fusion;
and S203, carrying out full-automatic three-dimensional live-action modeling to generate a low-altitude image and ground three-dimensional laser point cloud fusion three-dimensional modeling effect diagram.
As a preferred embodiment of the present invention, in step S3, the three-dimensional modeling combining the low-altitude image and the three-dimensional white model is a three-dimensional modeling technique using the low-altitude image as a main component and the three-dimensional white model as an auxiliary component, and a key core technique thereof is processing of the three-dimensional white model, and the specific method is as follows:
step S301, importing the low-level image data into ContextCapture4.4.9 software to mark image control points;
step S302, carrying out aerial triangulation processing on the aerial image marked with the image control point, checking an aerial triangulation processing report in real time, and checking whether the aerial triangulation processing report meets the precision requirement of three-dimensional modeling:
if yes, go to step S303;
if not, go to step S301;
step S303, generating a three-dimensional model in an OBj format to a specified folder;
step S304, a three-dimensional white mould derived format obtained by ground three-dimensional laser point cloud encapsulation in GeomagicStudio2012 software is named as obj;
and S305, replacing the three-dimensional model file in the form of the obj format generated by the low-altitude image with the three-dimensional white mould in the form of the obj, and performing full-automatic three-dimensional modeling to generate an image and three-dimensional white mould fused three-dimensional modeling effect graph.
As a preferred embodiment of the present invention, in step S4, the comprehensive analysis includes precision analysis and modeling effect analysis.
As a preferred scheme of the present invention, the actual dimension measured by the steel ruler in the precision analysis is a 'quasi-true value', and the dimension of the three-dimensional model manually measured by the software is used as a precision measure, and the specific method is as follows:
each size is measured for 3 times, the average value of the 3 times is taken as the precision weighing value, and when 2 errors in the 3 times of measurement exceed 0.5mm, the size is measured again.
As a preferred scheme of the present invention, the modeling effect analysis mainly uses a geometric structure effect and a color texture effect of a three-dimensional model as a modeling effect measurement standard, and the specific manner is as follows:
and sequentially comparing the geometric structure effect and the color texture effect in the air-ground image fused three-dimensional modeling effect graph, the low-altitude image and ground three-dimensional laser point cloud fused three-dimensional modeling effect graph and the image and three-dimensional white model fused three-dimensional modeling effect graph.
As a preferred scheme of the invention, before the air-ground image fusion three-dimensional modeling, the low-altitude image and ground three-dimensional laser point cloud fusion three-dimensional modeling and the image and three-dimensional white model fusion three-dimensional modeling are carried out, image data acquisition and image data processing are required, wherein the image data acquisition comprises ground image data acquisition, low-altitude image data acquisition and ground three-dimensional laser point cloud data acquisition, and the image data processing comprises air-ground image data processing and ground three-dimensional laser point cloud data processing.
As a preferred scheme of the invention, the ground image data acquisition performs three rounds of surrounding shooting on the research object on the ground, wherein the three rounds of surrounding shooting are respectively vertical 90 degrees, upward inclination 40 degrees and downward inclination 45 degrees, the overlapping rate is about 60%, and 209 shots are taken in total;
the low-altitude image data is acquired by carrying out surrounding shooting on a research object in low altitude for three circles, wherein the shooting is carried out at 5m, 10m and 15m in inclined angles of 45 degrees, the overlapping rate is about 60 percent, and 340 shots are carried out in total;
the ground three-dimensional laser point cloud data acquisition is used for distributing the station number and the position of a scanning station according to the field condition, the scanning station is required to ensure that no shielded area exists in a scanning view, and a target scene can be scanned to the maximum extent.
As a preferred scheme of the invention, the air-ground image data processing is divided into three parts, namely image screening, automatic aerial triangulation and full-automatic three-dimensional modeling;
the ground three-dimensional laser point cloud data processing comprises data splicing, three-dimensional modeling and texture mapping.
Compared with the prior art, the invention has the following beneficial effects:
the invention takes ground camera image, low-altitude unmanned aerial vehicle image and ground three-dimensional laser point cloud data as fusion objects, researches a method for three-dimensional modeling of air-ground image fusion, low-altitude image fusion ground three-dimensional laser point cloud and low-altitude image fusion three-dimensional white mould, and comprehensively analyzes the three-dimensional modeling precision and the modeling effect to select the modeling effect picture with the highest color texture effect and geometric structure precision so as to meet the modeling requirement of a three-dimensional real scene model of a larger scene.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
Fig. 1 is a flowchart of a method for fusion display of multi-format basic geographic information data according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1, the present invention provides a method for fusion display of multi-format basic geographic information data, comprising the following steps:
step S1, performing three-dimensional modeling of air-ground image fusion;
in the step S1, the air-ground image fusion three-dimensional modeling is a three-dimensional modeling technology with a low-altitude image as a main component and a ground image as an auxiliary component, and the key core technology is image matching, and the specific method is as follows:
step S101, importing low-altitude image data into ContextCapture4.4.9 software to perform automatic aerial triangulation processing without image control points, importing ground images and performing image control point marking work on the ground images, wherein at least three marks are marked on the ground images and the low-altitude images respectively to ensure the accuracy of the marks on each image;
step S102, carrying out aerial triangulation processing on the aerial image marked with the image control point, checking an aerial triangulation processing report in real time, and checking whether the aerial triangulation processing report meets the precision requirement of three-dimensional modeling:
if yes, go to step S103;
if not, turning to step S101;
and S103, carrying out full-automatic three-dimensional live-action modeling to generate an air-ground image fusion three-dimensional modeling effect diagram.
Step S2, performing three-dimensional modeling of low-altitude image and ground three-dimensional laser point cloud fusion;
in the step S2, the fusion three-dimensional modeling of the low-altitude image and the ground three-dimensional laser point cloud is a three-dimensional modeling technology with the low-altitude image as a main part and the ground three-dimensional laser point cloud as an auxiliary part, and the key core technology is the unification of coordinates, and the specific method is as follows:
step S201, importing low-altitude image data into ContextCapture4.4.9 software to perform automatic aerial triangulation processing without image control points, importing closed ground three-dimensional laser point cloud data in a las format after the processing is completed, and then performing image control point marking work on the low-altitude image;
s202, performing aerial triangulation processing of low-altitude image and ground three-dimensional laser point cloud data fusion;
and S203, carrying out full-automatic three-dimensional live-action modeling to generate a low-altitude image and ground three-dimensional laser point cloud fusion three-dimensional modeling effect diagram.
Step S3, carrying out three-dimensional modeling by fusing a low-altitude image and a three-dimensional white model;
in the step S3, the three-dimensional modeling of the fusion of the low-altitude image and the three-dimensional white model is a three-dimensional modeling technology with the low-altitude image as a main component and the three-dimensional white model as an auxiliary component, and the key core technology is the processing of the three-dimensional white model, and the specific method is as follows:
step S301, importing the low-level image data into ContextCapture4.4.9 software to mark image control points;
step S302, carrying out aerial triangulation processing on the aerial image marked with the image control point, checking an aerial triangulation processing report in real time, and checking whether the aerial triangulation processing report meets the precision requirement of three-dimensional modeling:
if yes, go to step S303;
if not, go to step S301;
step S303, generating a three-dimensional model in an OBj format to a specified folder;
step S304, a three-dimensional white mould derived format obtained by ground three-dimensional laser point cloud encapsulation in GeomagicStudio2012 software is named as obj;
and S305, replacing the three-dimensional model file in the form of the obj format generated by the low-altitude image with the three-dimensional white mould in the form of the obj, and performing full-automatic three-dimensional modeling to generate an image and three-dimensional white mould fused three-dimensional modeling effect graph.
And S4, performing comprehensive analysis on the three-dimensional modeling of the fusion of the air-ground image, the three-dimensional modeling of the fusion of the low-air image and the ground three-dimensional laser point cloud and the three-dimensional modeling of the fusion of the low-air image and the three-dimensional white model, and selecting the three-dimensional scene with the highest precision as the three-dimensional scene containing the multi-format basic geographic information to display.
And step S4, the comprehensive analysis comprises precision analysis and modeling effect analysis.
As a preferred scheme of the present invention, the actual dimension measured by the steel ruler in the precision analysis is a 'quasi-true value', and the dimension of the three-dimensional model manually measured by the software is used as a precision measure, and the specific method is as follows:
each size is measured for 3 times, the average value of the 3 times is taken as the precision weighing value, and when 2 errors in the 3 times of measurement exceed 0.5mm, the size is measured again.
The modeling effect analysis mainly takes the geometric structure effect and the color texture effect of the three-dimensional model as the modeling effect measurement standard, and the specific mode is as follows:
and sequentially comparing the geometric structure effect and the color texture effect in the air-ground image fused three-dimensional modeling effect graph, the low-altitude image and ground three-dimensional laser point cloud fused three-dimensional modeling effect graph and the image and three-dimensional white model fused three-dimensional modeling effect graph.
Because the ground image is shot on the ground, and part of the top cannot be shot, the bottom geometric structure effect of the constructed three-dimensional model is better, and the top geometric structure effect is poorer. And because the low-altitude image is shot in the air, the geometric structure effect of the top and the bottom of the constructed three-dimensional model is better as a whole, but the effect of the geometric structure of the bottom is poorer than that of the geometric structure of the top due to the reasons of shielding, shadow and the like of the geometric structure of the bottom. The three-dimensional model constructed by the air-ground image fusion has a complete geometric structure effect, does not have the defects of the top geometric structure of the ground image model and the top geometric structure of the low-altitude image model, and realizes the advantage complementation of the ground image and the low-altitude image. However, the texture effect of the three-dimensional model has color difference due to the difference of the camera sensors used for shooting the ground image and the low-altitude image. The suggestion can try handheld unmanned aerial vehicle to shoot ground image and merge the modeling again, and the effect can be better like this.
The three-dimensional model constructed by fusing the low-altitude image with the ground three-dimensional laser point cloud and the three-dimensional model constructed by fusing the low-altitude image with the three-dimensional white model are essentially fused with ground three-dimensional laser point cloud data, and the difference is that the three-dimensional model constructed by fusing the low-altitude image with the ground three-dimensional laser point cloud has chromatic aberration, the constructed model effect is greatly influenced by data fusion, and the requirement on data fusion precision is high. And the three-dimensional model constructed by fusing the low-altitude image with the three-dimensional white model is less influenced by data fusion, and the unmanned aerial vehicle live-action is carried out on the basis of the three-dimensional white model.
The texture mapping of the image has the geometric structure precision of a three-dimensional white mold and the abundant texture information of the low-altitude image, and the constructed model has a good effect.
Before the air-ground image fusion three-dimensional modeling, the low-altitude image and ground three-dimensional laser point cloud fusion three-dimensional modeling and the image and three-dimensional white model fusion three-dimensional modeling are carried out, image data acquisition and image data processing are required, wherein the image data acquisition comprises ground image data acquisition, low-altitude image data acquisition and ground three-dimensional laser point cloud data acquisition, and the image data processing comprises air-ground image data processing and ground three-dimensional laser point cloud data processing.
The ground image data is acquired, the research object is shot on the ground in a surrounding mode for three circles, namely shooting at 90 degrees vertically, 40 degrees upwards and 45 degrees downwards, the overlapping rate is about 60%, and 209 shots are shot in total;
the low-altitude image data is acquired by carrying out surrounding shooting on a research object in low altitude for three circles, wherein the shooting is carried out at 5m, 10m and 15m in inclined angles of 45 degrees, the overlapping rate is about 60 percent, and 340 shots are carried out in total;
the ground three-dimensional laser point cloud data acquisition is used for distributing the station number and the position of a scanning station according to the field condition, the scanning station is required to ensure that no shielded area exists in a scanning view, and a target scene can be scanned to the maximum extent.
The air-ground image data processing is divided into three parts, namely image screening, automatic air triangulation and full-automatic three-dimensional modeling;
the image screening is to screen the images shot by the ground camera, delete the blurred, overexposed and redundant images and avoid the calculation failure when the aerial triangulation is carried out again.
The automatic aerial triangulation is to import the image into ContextCapture4.4.9 software, mark the measured control point on the shot image, and then automatically carry out aerial triangulation.
The full-automatic three-dimensional modeling is to perform automatic dense matching on the aerial triangulation result with DSM, construct a TIN model, generate a white mold and then perform 3D texture mapping.
The ground three-dimensional laser point cloud data processing comprises data splicing, three-dimensional modeling and texture mapping.
And the data splicing is to import the multi-station laser point cloud data scanned by the ground three-dimensional laser scanner into the software of Riscanpro1.6.4 for splicing. Splicing is divided into coarse splicing and fine splicing, wherein the coarse splicing is to roughly splice 2-station data together by manually translating and rotating the data with a certain overlapping rate from 2 stations. And the fine splicing is to perform full-automatic splicing on the data after the coarse splicing, and automatically search and splice the same points of the data of the first station and the data of the second station until the splicing precision meets the requirement. Denoising the spliced point cloud data, and reserving point cloud data with research value.
The three-dimensional modeling is to import the spliced point cloud data into Geomagicstudios 2012 software for three-dimensional modeling. The triangular patch is constructed by using a packaging tool, non-manifold edges, self-intersection edges, high-refraction edges, nails and small holes can appear after the construction of the triangular patch is completed, and the effect of the three-dimensional model is better after the three-dimensional model is repaired by a grid doctor, filling holes and other tools.
Texture mapping is performed by introducing the package-patched white mold into 3d max2015 software. Texture mapping requires preparing and cutting a real-scene orthographic image shot by a camera in advance, and achieving the texture effect of the real scene after mapping.
The invention takes ground camera image, low-altitude unmanned aerial vehicle image and ground three-dimensional laser point cloud data as fusion objects, researches a method for three-dimensional modeling of air-ground image fusion, low-altitude image fusion ground three-dimensional laser point cloud and low-altitude image fusion three-dimensional white mould, and comprehensively analyzes the three-dimensional modeling precision and the modeling effect to select the modeling effect picture with the highest color texture effect and geometric structure precision so as to meet the modeling requirement of a three-dimensional real scene model of a larger scene.
The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.
Claims (10)
1. A method for fusing and displaying multi-format basic geographic information data is characterized by comprising the following steps:
step S1, performing three-dimensional modeling of air-ground image fusion;
step S2, performing three-dimensional modeling of low-altitude image and ground three-dimensional laser point cloud fusion;
step S3, carrying out three-dimensional modeling by fusing a low-altitude image and a three-dimensional white model;
and S4, performing comprehensive analysis on the three-dimensional modeling of the fusion of the air-ground image, the three-dimensional modeling of the fusion of the low-air image and the ground three-dimensional laser point cloud and the three-dimensional modeling of the fusion of the low-air image and the three-dimensional white model, and selecting the three-dimensional scene with the highest precision as the three-dimensional scene containing the multi-format basic geographic information to display.
2. The method for fusion display of multi-format basic geographic information data according to claim 1, wherein: in the step S1, the air-ground image fusion three-dimensional modeling is a three-dimensional modeling technology with a low-altitude image as a main component and a ground image as an auxiliary component, and the key core technology is image matching, and the specific method is as follows:
step S101, importing low-altitude image data into ContextCapture4.4.9 software to perform automatic aerial triangulation processing without image control points, importing ground images and performing image control point marking work on the ground images, wherein at least three marks are marked on the ground images and the low-altitude images respectively to ensure the accuracy of the marks on each image;
step S102, carrying out aerial triangulation processing on the aerial image marked with the image control point, checking an aerial triangulation processing report in real time, and checking whether the aerial triangulation processing report meets the precision requirement of three-dimensional modeling:
if yes, go to step S103;
if not, turning to step S101;
and S103, carrying out full-automatic three-dimensional live-action modeling to generate an air-ground image fusion three-dimensional modeling effect diagram.
3. The method for fusion display of multi-format basic geographic information data according to claim 2, wherein: in the step S2, the fusion three-dimensional modeling of the low-altitude image and the ground three-dimensional laser point cloud is a three-dimensional modeling technology with the low-altitude image as a main part and the ground three-dimensional laser point cloud as an auxiliary part, and the key core technology is the unification of coordinates, and the specific method is as follows:
step S201, importing low-altitude image data into ContextCapture4.4.9 software to perform automatic aerial triangulation processing without image control points, importing closed ground three-dimensional laser point cloud data in a las format after the processing is completed, and then performing image control point marking work on the low-altitude image;
s202, performing aerial triangulation processing of low-altitude image and ground three-dimensional laser point cloud data fusion;
and S203, carrying out full-automatic three-dimensional live-action modeling to generate a low-altitude image and ground three-dimensional laser point cloud fusion three-dimensional modeling effect diagram.
4. The method for fusion display of multi-format basic geographic information data according to claim 3, wherein: in the step S3, the three-dimensional modeling of the fusion of the low-altitude image and the three-dimensional white model is a three-dimensional modeling technology with the low-altitude image as a main component and the three-dimensional white model as an auxiliary component, and the key core technology is the processing of the three-dimensional white model, and the specific method is as follows:
step S301, importing the low-level image data into ContextCapture4.4.9 software to mark image control points;
step S302, carrying out aerial triangulation processing on the aerial image marked with the image control point, checking an aerial triangulation processing report in real time, and checking whether the aerial triangulation processing report meets the precision requirement of three-dimensional modeling:
if yes, go to step S303;
if not, go to step S301;
step S303, generating a three-dimensional model in an OBj format to a specified folder;
step S304, a three-dimensional white mould derived format obtained by ground three-dimensional laser point cloud encapsulation in GeomagicStudio2012 software is named as obj;
and S305, replacing the three-dimensional model file in the form of the obj format generated by the low-altitude image with the three-dimensional white mould in the form of the obj, and performing full-automatic three-dimensional modeling to generate an image and three-dimensional white mould fused three-dimensional modeling effect graph.
5. The method for fusion display of multi-format basic geographic information data according to claim 4, wherein: and step S4, the comprehensive analysis comprises precision analysis and modeling effect analysis.
6. The method for fusion display of multi-format basic geographic information data according to claim 5, wherein: the actual dimension that precision analysis was got with the steel chi volume is "accurate true value", takes the three-dimensional model dimension volume value that software manual measurement was got as the precision weighing value, and the concrete mode is:
each size is measured for 3 times, the average value of the 3 times is taken as the precision weighing value, and when 2 errors in the 3 times of measurement exceed 0.5mm, the size is measured again.
7. The method for fusion display of multi-format basic geographic information data according to claim 6, wherein the modeling effect analysis mainly uses a geometric structure effect and a color texture effect of a three-dimensional model as a modeling effect measurement standard, and the specific way is as follows:
and sequentially comparing the geometric structure effect and the color texture effect in the air-ground image fused three-dimensional modeling effect graph, the low-altitude image and ground three-dimensional laser point cloud fused three-dimensional modeling effect graph and the image and three-dimensional white model fused three-dimensional modeling effect graph.
8. The method for fusion display of multi-format basic geographic information data according to claim 7, wherein image data collection and image data processing are required before the three-dimensional modeling of air-ground image fusion, the three-dimensional modeling of low-altitude image and ground three-dimensional laser point cloud fusion and the three-dimensional modeling of image and three-dimensional white model fusion, wherein the image data collection comprises the ground image data collection, the low-altitude image data collection and the ground three-dimensional laser point cloud data collection, and the image data processing comprises the air-ground image data processing and the ground three-dimensional laser point cloud data processing.
9. The method for fusion display of multi-format basic geographic information data according to claim 8, wherein the ground image data acquisition is performed on the ground to perform three rounds of surrounding shooting on the research object, wherein the three rounds of surrounding shooting are respectively vertical 90 degrees, upward-inclined 40 degrees and downward-inclined 45 degrees, the overlapping rate is about 60%, and 209 shots are performed in total;
the low-altitude image data is acquired by carrying out surrounding shooting on a research object in low altitude for three circles, wherein the shooting is carried out at 5m, 10m and 15m in inclined angles of 45 degrees, the overlapping rate is about 60 percent, and 340 shots are carried out in total;
the ground three-dimensional laser point cloud data acquisition is used for distributing the station number and the position of a scanning station according to the field condition, the scanning station is required to ensure that no shielded area exists in a scanning view, and a target scene can be scanned to the maximum extent.
10. The method for fusion display of multi-format basic geographic information data according to claim 9, wherein the processing of the air-ground image data is divided into three parts, namely image screening, automatic aerial triangulation, full-automatic three-dimensional modeling;
the ground three-dimensional laser point cloud data processing comprises data splicing, three-dimensional modeling and texture mapping.
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