CN105261067A - Overground and underground integrated modeling method based on true 3D volumetric display technique and system - Google Patents

Abstract

The invention relates to the field of three-dimensional technology and provides an overground and underground integrated modeling method based on true 3D volumetric display technique. The modeling method comprises following steps of A: using a Bigemap map interception device to intercept a remote sensing bottom diagram in a designed area on a map downloaded from a Bigemap; B: matching a daogle bottom diagram with an underground pipe network CAD measurement graph and using a MAPGIS to draw an underground pipe network vector diagram of the designated area; C: using the MAPGIS and a 3DMAX to perform three-dimensional modeling for overground facilities and underground pipe networks in the designated area; D: performing three-dimensional model integration on a GIS model and a 3DMAX model on a MAPGIS platform; and E: performing space analysis and attribute searching on the integrated three-dimensional models. The modeling method is characterized and advantaged by simple structure, easy operation, low manufacturing cost and fine and smooth models, can be widely applicable for overground and underground integrated modeling in schools, communities, industrial zones and parks, and has high market promotion and application value.

Description

A modeling method and system based on true three-dimensional ground-underground integration

technical field

The invention belongs to the field of three-dimensional technology, and in particular relates to a modeling method and system based on true three-dimensional ground-underground integration.

Background technique

Statistics show that more than 30% of the damage accidents of the underground pipeline system in the United States are caused by improper excavation. In this regard, the United States has established a GIS platform, and uses the GIS system for accurate management and positioning. American citizens can tell the diggers the detailed information of the pipeline as long as they dial the "811" special line. my country's pipeline construction was chaotic in the early stage, and the later maintenance was unsupervised, and road zippers appeared frequently. With the acceleration of my country's urbanization process, more and more road excavations are required. Water, gas, power and communication interruptions caused by construction damage to underground pipelines occur frequently. According to statistics from the annual meeting of the Underground Pipeline Professional Committee of the China Urban Planning Association: From 2008 to 2010, there were an average of 5.6 underground pipeline accidents reported by the media in the country every day (a total of 6,132 in 3 years). Among them, excavator digging and improper construction accounted for 62.7%. The annual direct economic loss caused by pipeline network accidents caused by construction in the country reached 50 billion yuan, and the annual direct economic loss caused by road excavation was about 200 billion yuan.

It can be seen that the demand for underground space information is becoming increasingly urgent. To this end, the State Council issued the "Guiding Opinions of the General Office of the State Council on Strengthening the Construction and Management of Urban Underground Pipelines" on the management of underground pipeline construction. The "Opinions" clearly pointed out that "by the end of 2015, complete the general survey of urban underground pipelines, establish a comprehensive management information system, and compile and complete the comprehensive planning of underground pipelines." It can be seen that the government is paying more and more attention to the underground pipeline network.

Nowadays, various units widely use 2D CAD system to draw the distribution of pipe network, a few use 3D CAD to express the shape of pipe network, and some use 3DMAX to design and make pipe network renderings. However, these design methods cannot reflect the three-dimensional geographic coordinates of the underground pipe network, which is not conducive to spatial analysis, attribute query and visual management.

Current planning and design methods and their deficiencies

1. Traditional methods cannot perform attribute query and spatial analysis

Nowadays, various units widely use 2D CAD system to draw the distribution of pipe network, a few use 3D CAD to express the shape of pipe network, and some use 3DMAX to design and make pipe network renderings. However, these design methods cannot reflect the three-dimensional geographic coordinates of the underground pipe network, which is not conducive to spatial analysis, attribute query and visual management.

2. The two-dimensional GIS system built lacks three-dimensional information, which is not conducive to management and analysis

The professional pipeline ownership units in some cities have established urban comprehensive underground pipeline information systems and professional pipeline information systems. But most of these are two-dimensional GIS systems. Two-dimensional GIS is only a simplified process of projecting all kinds of geographic objects in three-dimensional space to two-dimensional planes, resulting in the loss of geometric position information, spatial topology information and partial semantic information in the third dimension (ie, vertical direction). Can not fully reflect the objective world. Therefore, the geographical information expressed by two-dimensional GIS is solidified and flat. This work can generate 3D models of underground pipelines based on the buried depth, pipeline length, pipeline specifications and other information of various types of underground pipelines and quickly display them, so that the relative position relationship and connectivity parameters of the underground pipeline network can be understood in a timely manner. Observe and roam the simulated reality generated by all underground space and topographic map data in the region, and realize the query of attribute information of any spatial entity in the observation map.

3. The above-ground and underground integrated modeling has not been carried out

However, only underground three-dimensional information is not enough. In pipeline accidents, it is more and more necessary to deal with accidents in combination with ground features; during construction, it is necessary to conduct comprehensive analysis in combination with ground features, so as to formulate a reasonable construction plan .

4. Only pay attention to the three-dimensional objects on the ground, not the three-dimensional shape of the underground pipe network

At present, there are many three-dimensional electronic maps, but most of them focus on the distribution and shape of above-ground facilities, and do not pay attention to the status of the underground pipeline network, the lifeline of the city's operation, nor how to organically combine the above-ground and underground coordinates to reduce the number of ground roads. Repeated excavation caused huge losses to the pipeline network.

5. The cost of laser vehicle scanning is high, which is not conducive to modeling small areas on the ground, and cannot be used for underground modeling

At present, laser vehicle scanning is widely used in 3D maps on the ground, and professional software batch processing methods are used to build large-scale ground models. This method is characterized by large batches and fast processing. But the disadvantage is that the cost is extremely high. The rent of the equipment on the street can reach 50,000 yuan a day, not including the later processing costs. Therefore, for small spaces such as schools, communities, industrial areas, and hospitals, it is extremely uneconomical to use laser vehicles. Moreover, laser vehicles cannot model underground pipe networks.

The overall cost of the above-ground and underground integrated virtual campus of this work is almost free except for labor costs. Because the digital camera is inherent in the laboratory, the software is a learning version (no cost). The construction period of the above-ground and underground integrated virtual campus is one week for three skilled students. The total cost is 5000, and the cost is extremely low. Therefore, it has broad application prospects and economic value.

6. Traditional surveying and mapping methods are time-consuming and labor-intensive

In the past, the establishment of a campus geographic information system required surveying and mapping of the entire campus, which required a long time, a large number of personnel, and a lot of special equipment for surveying and mapping. This work uses the Bigemap map interceptor to intercept the remote sensing base map of the campus, and uses GPS data to correct it, with an accuracy of 1 meter. It reduces the manpower, material resources, financial resources and time of surveying and mapping the campus.

7. GIS software cannot establish refined models and special-shaped models

Because the GIS software itself is a geographic information software, the expression of the model is not delicate enough, especially the special-shaped model. The 3DMAX software can express the model very finely, but there is no geographic coordinate information. Therefore, this work effectively combines 3DMAX software and GIS software, and develops their respective strengths, forming a model with accurate three-dimensional geographic coordinates and fine expression.

Based on the above problems, it is urgent to realize the 3D modeling of above-ground and underground integration, which can take into account various types of complex structures, various types, and large quantities of pipe networks above and below the ground, and update and monitor data in a more timely manner. Through spatial analysis and attribute analysis, avoid pipe network accidents and conflicts between underground and underground facilities during construction.

Contents of the invention

The purpose of the present invention is to provide a modeling method and system based on true three-dimensional above-ground and underground integration, aiming at solving the above-mentioned technical problems.

The present invention is achieved in this way, a modeling method based on true three-dimensional above-ground and underground integration, the modeling method includes the following steps:

A. Use the Bigemap map interceptor to intercept the remote sensing base map of the specified area on the map downloaded by BigeMap;

B. Use the base map of Daoge and the CAD survey map of the underground pipe network to match, and use MAPGIS to draw the vector map of the underground pipe network in the specified area;

C. Use MAPGIS and 3DMAX to conduct 3D modeling of the above-ground facilities and underground pipe network in the designated area;

D. Combine the GIS model and 3DMAX model on the MAPGIS platform for 3D model fusion;

E. Perform spatial analysis and attribute query on the fused 3D model.

A further technical solution of the present invention is: said step E also includes the following steps:

E1. Observe and roam the generated 3D model, and realize the entity space analysis of any space and the query of attribute information during the observation.

A further technical solution of the present invention is: said step B also includes the following steps:

B1. Use MAPGIS to correct the coordinate grid of the CAD survey map of the underground pipe network according to the above-ground facilities to be consistent with the coordinates of the remote sensing base map.

The further technical scheme of the present invention is: described step A also comprises the following steps:

A1. Correct the accuracy of the map downloaded by BigeMap through GPS data;

A2. Perform grid correction on the coordinates of the remote sensing base map intercepted by BigeMap on the MAPGIS platform.

A further technical solution of the present invention is: the spatial analysis includes buffer analysis, superposition analysis, spatial statistical analysis, height analysis, angle analysis and area analysis.

Another object of the present invention is to provide a modeling system based on true three-dimensional above-ground and underground integration, which includes:

The base map interception module is used to intercept the remote sensing base map of the designated area on the map downloaded by BigeMap using the Bigemap map interceptor;

The network management vector diagram generation module is used to match the Daoge base map with the CAD survey map of the underground pipe network, and use MAPGIS to draw the underground pipe network vector diagram of the specified area;

The 3D modeling module is used to use MAPGIS and 3DMAX to perform 3D modeling of the aboveground facilities and underground pipe network in the designated area;

The model fusion module is used for 3D model fusion of GIS model and 3DMAX model on the MAPGIS platform;

The analysis query module is used to perform spatial analysis and attribute query on the fused 3D model.

A further technical solution of the present invention is: the analysis query module also includes:

The observation and query unit is used for observing and roaming the generated 3D model and realizing the entity space analysis and attribute information query of any space during the observation.

A further technical solution of the present invention is: the network management vector diagram generating module also includes:

The pipe network coordinate correction unit is used to use MAPGIS to correct the coordinate grid of the CAD survey map of the underground pipe network according to the above-ground facilities to be consistent with the coordinates of the remote sensing base map.

A further technical solution of the present invention is: the base map interception module also includes:

The accuracy correction unit is used to correct the accuracy of the map downloaded by BigeMap through GPS data;

The base map coordinate correction unit is used to perform grid correction on the remote sensing base map coordinates intercepted by BigeMap on the MAPGIS platform.

A further technical solution of the present invention is: the spatial analysis includes buffer analysis, superposition analysis, spatial statistical analysis, height analysis, angle analysis and area analysis.

The beneficial effects of the present invention are: to overcome the problem that the GIS system cannot establish a special-shaped model and the problem that the 3DMAX model has no geographic information, establish a virtual campus based on the integration of the above-ground and underground spaces based on the true three-dimensional technology, and realize the above-ground and underground space based on the true three-dimensional Live tour. The corresponding underground feature can be queried according to the coordinate position on the ground, and the corresponding above-ground feature can also be queried according to the coordinate position of the underground feature. Before deciding to excavate the road surface, the distribution, depth and connection relationship of the underground pipe network can be mastered according to the underground features found on the ground, so as to determine the appropriate excavation plan and avoid the loss of the pipeline system caused by improper excavation; When a pipe burst accident occurs, combined with surface distance measurement, through the analysis of the connectivity and buffer zone of the underground pipe network, the valve can be quickly found and the scope of influence can be determined, so as to carry out effective disaster relief. The 3D model of underground pipelines can be generated and quickly displayed according to the buried depth, pipeline length, pipeline specifications and other information of various underground pipelines, and the relative position relationship and connectivity parameters of the underground space can be understood in time. Observe and roam the simulated reality generated by all underground space and topographic map data in the region, and realize the query of attribute information of any spatial entity in the observation map. The effective combination of 3DMAX software and GIS software forms a model with accurate three-dimensional geographic coordinates and fine expression. By using the BIGEMAP remote sensing map interceptor and GPS correction method, a base map with correct coordinates with an accuracy of 1 meter can be obtained, which saves manpower, material resources, time and financial resources required for surveying and mapping the campus. This modeling method has the characteristics and advantages of simple structure, convenient operation, low cost, delicate and realistic model, etc. It can be widely used in the integrated above-ground and underground modeling of campuses, residential areas, industrial areas and parks, and has good market promotion and application value .

Description of drawings

Fig. 1 is a flow chart of a modeling method based on true three-dimensional above-ground and underground integration provided by an embodiment of the present invention;

Fig. 2 is a structural block diagram of a modeling system based on true three-dimensional above-ground and underground integration provided by an embodiment of the present invention.

detailed description

Fig. 1 shows the flow chart of the modeling method based on true three-dimensional above-ground and underground integration provided by the present invention, which is described in detail as follows:

Step S1, use the Bigemap map extractor to intercept the remote sensing base map of the designated area on the map downloaded by BigeMap; download the map through "BigeMap map". The downloaded map of BigeMap has latitude and longitude, and the accuracy of the downloaded map of "Bigemap map" reaches 5 meters. Its accuracy error is relatively large. In order to make the accuracy error of the map smaller, the accuracy of the map downloaded by BigeMap is corrected through GPS data. After correction, the accuracy can reach 1 meter. Through the Bigemap map interceptor, the remote sensing base map of the campus is obtained on the corrected map. There is a certain error between the coordinates of the campus remote sensing base map of the Bigemap map interceptor and the coordinates of the actual ground facilities. The grid correction is performed on the coordinates of the remote sensing base map intercepted by BigeMap on the MAPGIS platform to reduce the error.

Table 1 BIGEMAP map interceptor characteristics

Step S2, use the Daoge map and the underground pipe network CAD survey map to draw the underground pipe network vector diagram of the specified area; use CAD software to make the campus underground pipe network survey map, because the coordinates of the campus underground pipe network CAD survey map and the base map If the coordinates are inconsistent, convert the CAD drawing into a *.BMP file, and use MAPGIS to correct the CAD measurement drawing of the underground pipe network according to the above-ground facilities, so that the coordinates of the pipe network map are consistent with the coordinates of the base map. According to the Daoge campus map (base map with latitude and longitude) and the CAD survey drawing of the campus underground pipe network, draw the vector diagram of the water supply pipe network and drainage pipe network.

Step S3, using MAPGIS and 3DMAX to carry out three-dimensional modeling of the aboveground facilities and underground pipe network in the designated area; using MAPGIS software to model the aboveground and underground facilities; using 3DMAX software to model the aboveground and underground facilities. The modeling in step S3 includes building modeling, tree modeling, road modeling, DEM modeling and pipe network three-dimensional modeling. Among them, building modeling (taking the teaching building as an example): the first step: creating textured buildings. Click "Create Texture Architecture" and select the corresponding zone file. Paste the corresponding material on the top and side of the building, and click OK. Step 2: Select the material. Right-click on the "3D model" to create a layer and save it to the database; if the feature class has already been created, select "Select an existing feature class", if not, select "Create feature class", here "Choose to create a feature class" . Step 3: Create feature classes. Enter a name for the feature class and click OK. Step 4: Select the elevation attribute field. Select "Elevation" and click OK. Tree modeling, the first step: create trees. Click the tree icon to select the line file, and set the corresponding parameters and materials. Step 2: Select the material. Right-click on the "3D model" to create a layer and save it to the database; if the feature class has already been created, select "Select an existing feature class", if not, select "Create feature class", here "Choose to create a feature class" . Step 3: Select the feature class. Select the corresponding feature class name and click OK. Step 4: Select the elevation attribute field. Select "Elevation" and click OK. Road modeling, the first step: create roads. Click the road icon, select the line file, and set the corresponding parameters and materials. Step 2: Select the material. Right-click on the "3D model" to create a layer and save it to the database; if the feature class has already been created, select "Select an existing feature class", if not, select "Create feature class", here "Choose to create a feature class" . Step 3: Select the feature class. Select the corresponding feature class name and click OK. Step 4: Select the elevation attribute field. Select "Elevation" and click OK. DEM modeling, the first step: In the map editor, use the line editor to draw contour lines and assign elevation values. Step 2: Open the Grid analysis in Digital Terrain Analysis and select "Discrete Data Gridding". Select "Simple Feature Class" as the type, and change the Z value to "elevation". Step 3: Enter the "Number of Grid Lines". Generally, you can input 500 in the X direction and 400 in the Y direction. Then, when outputting the file, select "MapGIS70 Data" as the file type, and the file will be directly saved in the database, which is more convenient for use. . For 3D modeling of the pipe network, first draw the vector diagrams of the water supply pipe network and drainage pipe network based on the Daoge campus map (base map with latitude and longitude) and the campus underground pipe network CAD survey, and then build the underground pipe network in the 3D scene 3D, and then use digital terrain analysis to query the precise coordinates of the position of the external model to be imported, and then input the coordinates, zoom ratio and angle when importing the model in 3D, so that the model can be integrated into the 3D pipeline. 3D model modeling of underground pipelines, the first step: create pipelines. Click "Create Pipeline" and select the corresponding line file. Step 2: Select the basic section, radius, and color and basic information of the pipeline model. Since the pipeline is underground, a negative elevation must be set. Step 3: Create a layer and save it to the database; if you have already created a feature class, select "Select an existing feature class", if not, select "Create a feature class", here "Choose to create a feature class". Step 4: Create feature classes. Enter a name for the feature class and click OK. The integration of pipeline and water valve model, the first step: open the digital terrain analysis. Drag the base map into the document management module and set it as the current display, and drag the water supply pipeline and drainage pipeline into the document management module. Step 2: Elevation query. Click the icon, find and click the position of the tee pipe to be queried on the base map, and record the coordinates. Step 3: Open "External Data Import" in the 3D landscape platform, select "Select Feature Class and Layer", create a layer and click Next. Step 4: Save the information settings. Click "Save data to database", if you have already created a feature class, "Select an existing feature class", if not, select "Create feature class", here "Choose to create a feature class". Click Next to finish. Step 5: Keyboard positioning. Open "Keyboard Positioning", add a 3DMAX file, and input the queried latitude and longitude coordinates, and set the zoom ratio.

Step S4, on the MAPGIS platform, the GIS model and the 3DMAX model are carried out into three-dimensional model fusion; the external data import function of the three-dimensional landscape of GIS is imported to build the 3DMAX model, and input the precise coordinates of the position of the external model to be imported by digital terrain analysis query, Then input the coordinates, zoom ratio and angle when importing the model in 3D, so that the model can be integrated into the GIS model. Step 1: Open Digital Terrain Analysis. Drag the basemap into the Document Management module and set it as the current display. The second step: elevation point query. Click the icon, find the building to be queried on the base map and click. Step 3: Record coordinate information. Step 4: Open "External Data Import" in the 3D landscape platform, select "Select Feature Class and Layer", create a layer and click Next. Step 5: Save the information settings. Click "Save data to database", if you have already created a feature class, "Select an existing feature class", if not, select "Create feature class", here "Choose to create a feature class". Click Next to finish. Step 6: Keyboard positioning. Open "Keyboard Positioning", add a 3DMAX file, and input the queried latitude and longitude coordinates, and set the zoom ratio.

Step S5, performing spatial analysis and attribute query on the fused 3D model. Among them, the above-ground and underground space analysis is carried out on the fused three-dimensional map; the space analysis has the functions of buffer zone analysis, overlay analysis, spatial statistical analysis, height analysis, angle analysis, area analysis, etc. Through space analysis, the relative position of the underground pipe network can also be known. Users can gain new experience and knowledge, and use it as the basis for decision-making of spatial behavior. For example: Flood submersion analysis, sunshine analysis, distance measurement, area measurement, terrain analysis, visibility analysis, and filling and excavation calculations can be performed on ground facilities. Connectivity analysis, shortest distance analysis, pipe burst impact range analysis, etc. can be performed on the underground pipe network. It facilitates the planning, management and emergency handling of the campus. The above-ground and underground attribute query and analysis can also be performed on the fused 3D map; through attribute query, information such as the buried depth, pipeline length, and pipeline specification of the underground pipeline can be known, so as to know the maintenance status and texture of the pipeline network, so as to formulate maintenance plans and prevent Pipe network accidents. Through spatial analysis and attribute analysis, the ability to prevent disasters on the campus and the conflict between the upper and lower facilities during the construction process can be improved. Observe and roam in simulated reality on the 3D image generated after fusion. Observe and roam according to the generated simulated reality, and realize the query of attribute information of any spatial entity in the observation graph. At the same time, when performing three-dimensional display and roaming inside the underground space, you can view the information of different areas inside the space and the pipelines inside the space.

GDB Enterprise Manager Platform - Expand the created database directory in the directory tree, right-click the feature dataset node and select the "Create" item, and fill in the "Dataset Name" in the pop-up dialog box. Click the [Next] button and click the [Finish] button to create the dataset successfully.

Fig. 2 shows that another object of the invention is to provide a modeling system based on true three-dimensional integration of ground and underground, which includes:

The base map interception module is used to intercept the remote sensing base map of the designated area on the map downloaded by BigeMap using the Bigemap map interceptor;

The network management vector diagram generation module is used to match the Daoge base map with the CAD survey map of the underground pipe network, and use MAPGIS to draw the underground pipe network vector diagram of the specified area;

The 3D modeling module is used to use MAPGIS and 3DMAX to perform 3D modeling of the aboveground facilities and underground pipe network in the designated area;

The model fusion module is used for 3D model fusion of GIS model and 3DMAX model on the MAPGIS platform;

The analysis query module is used to perform spatial analysis and attribute query on the fused 3D model.

The analysis query module also includes:

The observation and query unit is used for observing and roaming the generated 3D model and realizing the entity space analysis and attribute information query of any space during the observation.

The network management vector diagram generating module also includes:

The pipe network coordinate correction unit is used to use MAPGIS to correct the coordinate grid of the CAD survey map of the underground pipe network according to the above-ground facilities to be consistent with the coordinates of the remote sensing base map.

The base map interception module also includes:

The accuracy correction unit is used to correct the accuracy of the map downloaded by BigeMap through GPS data;

The base map coordinate correction unit is used to perform grid correction on the remote sensing base map coordinates intercepted by BigeMap on the MAPGIS platform.

The spatial analysis includes buffer analysis, superposition analysis, spatial statistical analysis, height analysis, angle analysis and area analysis.

True 3D (True3DVolumetricDisplayTechnique) is a stereoscopic display technology, and it is also the latest research direction in computer stereoscopic vision systems. Based on this display technology, three-dimensional images with physical depth of field can be directly observed. Apply 3D GIS technology to the construction of virtual campus, vividly show the real campus through the expression of 3D real scene modeling, and bring users an immersive feeling. Combined with GIS spatial analysis technology, through human-computer interaction , can realize 3D scene browsing, attribute query, path analysis and other functions, and meet various needs of users to a greater extent. True 3D technology is the basis for integrated above-ground and underground modeling.

1. Using true 3D modeling technology

Make all the ground objects have the correct three-dimensional geographic coordinates (as shown in Table 2), which is helpful for the spatial analysis and attribute query of the ground objects. It realizes the roaming of above-ground and underground real scenes based on true 3D, the above-ground and underground visual space analysis, and the functions of attribute query, which meet the needs of campus digital management. It effectively avoids the economic loss of the pipeline network caused by pipeline network accidents and repeated excavation of the road surface.

2. Three-dimensional presentation of underground three-dimensional pipe network and its attribute query and spatial analysis functions

Our works can generate 3D models of underground pipelines based on the buried depth, pipeline length, pipeline specifications and other information of various underground pipelines and quickly display them. We can timely understand the relative position relationship and connectivity parameters of the underground space, so as to realize the underground pipeline network. Digital management solves the problems of low efficiency and inaccuracy in manual management of most underground pipe network data. Observe and roam the simulated reality generated by all underground space and topographic map data in the region, and realize the query of attribute information of any spatial entity in the observation map.

3. Attribute query and spatial analysis functions of above-ground and underground integration

Because it is an integrated system of above-ground and underground space, the corresponding underground features can be queried according to the above-ground coordinate positions, and the corresponding above-ground features can also be queried according to the coordinate positions of the underground features. Before deciding to excavate the road surface, the distribution, depth and connection relationship of the underground pipe network can be mastered according to the underground features found on the ground, so as to determine the appropriate excavation plan and avoid the loss of the pipeline system caused by improper excavation; When a pipe burst accident occurs, combined with surface distance measurement, through the analysis of the connectivity and buffer zone of the underground pipe network, the valve can be quickly found and the scope of influence can be determined, so as to carry out effective disaster relief.

4. The works are low-cost, practical and widely applicable

At present, laser vehicle scanning is widely used in 3D maps on the ground, and professional software batch processing methods are used to build large-scale ground models. This method is characterized by large batches and fast processing. But the disadvantage is that the cost is extremely high. The rent of the equipment can reach 50,000 yuan per day, not including the post-processing costs, and it cannot be used for modeling the underground pipe network. This is extremely uneconomical for small spaces. With a low cost of 5,000 yuan, we completed the virtual campus modeling work based on the integration of real three-dimensional ground and underground, which met the needs of digital management of the school. The cost is extremely low and the economy is good. It is suitable for small spaces such as schools, communities, industrial areas, and hospitals to establish an integrated above-ground and underground information management system.

5. Realistic, beautiful, detailed and geographic information models

Because the GIS software itself is a geographic information software, the expression of the model is not delicate enough, especially the special-shaped model. The 3DMAX software can express the model very finely, but there is no geographical coordinate information. Therefore, the model established by combining the two takes advantage of both. The established model not only has true three-dimensional coordinates, but also is more realistic, beautiful and refined.

6. Avoid traditional and cumbersome surveying and mapping methods

The remote sensing base map of the campus is intercepted by the Bigemap map interceptor, and corrected with GPS data, with an accuracy of 1 meter. The manpower, material resources and time of surveying and mapping the campus are reduced.

First use bigemap to obtain the base map, make the material, and finally make the model. Then the intercepted basemap has coordinate errors, so it is necessary to use MAPGIS to perform raster correction on the basemap. After the correction, the campus buildings, roads, trees, etc. are vectorized.

At this point, the two-dimensional vector production has come to an end, and the next step is the three-dimensional modeling process. First make the material, and then make the model, which is divided into two parts to make, the first is MapGIS model making, the second is 3DMAX model making, and then the two models are fused.

Because the coordinates of the CAD measurement drawing of the campus underground pipe network are inconsistent with the coordinates of the base map, the CAD map is converted into a *.BMP file, and MAPGIS is used to correct the grid of the pipe network map according to the above-ground facilities, so that the coordinates of the pipe network map are consistent with the coordinates of the base map . According to the Daoge campus map (base map with latitude and longitude) and the campus underground pipe network CAD measurement drawing, draw the vector diagram of the water supply pipe network and drainage pipe network, and then build a 3D image of the underground pipe network in the 3D scene, and then use digital terrain analysis Query the exact coordinates of the position of the external model to be imported, and then input the coordinates, zoom ratio and angle when importing the model in 3D, so that the model can be integrated into the 3D pipeline, and finally analyze the properties of the underground pipeline.

This method is low-cost, skillfully completes the modeling work of the integrated virtual campus based on true three-dimensional ground and underground, and realizes the roaming of above-ground and underground real scenes based on true three-dimensional, the functions of visual space analysis and attribute query of above-ground and underground, and satisfies the needs of the campus. The need for digital management. It effectively avoids the economic loss of the pipeline network caused by pipeline network accidents and repeated excavation of the road surface, and has wide application prospects and economic value.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. A modeling method based on true three-dimensional above-ground and underground integration, characterized in that, the modeling method comprises the following steps: A. Use the Bigemap map interceptor to intercept the remote sensing base map of the specified area on the map downloaded by BigeMap; B. Use the base map of Daoge and the CAD survey map of the underground pipe network to match, and use MAPGIS to draw the vector map of the underground pipe network in the specified area; C. Use MAPGIS and 3DMAX to conduct 3D modeling of the above-ground facilities and underground pipe network in the designated area; D. Combine the GIS model and 3DMAX model on the MAPGIS platform for 3D model fusion; E. Perform spatial analysis and attribute query on the fused 3D model. 2. modeling method according to claim 1, is characterized in that, described step E also comprises the following steps: E1. Observe and roam the generated 3D model, and realize the entity space analysis of any space and the query of attribute information during the observation. 3. modeling method according to claim 2, is characterized in that, described step B also comprises the following steps: B1. Use MAPGIS to correct the coordinate grid of the CAD survey map of the underground pipe network according to the above-ground facilities to be consistent with the coordinates of the remote sensing base map. 4. modeling method according to claim 3, is characterized in that, described step A also comprises the following steps: A1. Correct the accuracy of the map downloaded by BigeMap through GPS data; A2. Perform grid correction on the coordinates of the remote sensing base map intercepted by BigeMap on the MAPGIS platform. 5. The modeling method according to any one of claims 1-4, wherein the spatial analysis includes buffer analysis, superposition analysis, spatial statistical analysis, height analysis, angle analysis and area analysis. 6. A modeling system based on true three-dimensional above-ground and underground integration, characterized in that the modeling system includes: The base map interception module is used to intercept the remote sensing base map of the designated area on the map downloaded by BigeMap using the Bigemap map interceptor; The network management vector diagram generation module is used to match the Daoge base map with the CAD survey map of the underground pipe network, and use MAPGIS to draw the underground pipe network vector diagram of the specified area; The 3D modeling module is used to use MAPGIS and 3DMAX to perform 3D modeling of the aboveground facilities and underground pipe network in the designated area; The model fusion module is used for 3D model fusion of GIS model and 3DMAX model on the MAPGIS platform; The analysis query module is used to perform spatial analysis and attribute query on the fused 3D model. 7. modeling system according to claim 6, is characterized in that, also comprises in the described analysis inquiry module: The observation and query unit is used for observing and roaming the generated 3D model and realizing the entity space analysis and attribute information query of any space during the observation. 8. modeling system according to claim 7, is characterized in that, also comprises in the described network management vector diagram generation module: The pipe network coordinate correction unit is used to use MAPGIS to correct the coordinate grid of the CAD survey map of the underground pipe network according to the above-ground facilities to be consistent with the coordinates of the remote sensing base map. 9. modeling system according to claim 8, is characterized in that, also comprises in the described base map intercepting module: The accuracy correction unit is used to correct the accuracy of the map downloaded by BigeMap through GPS data; The base map coordinate correction unit is used to perform grid correction on the remote sensing base map coordinates intercepted by BigeMap on the MAPGIS platform. 10. The modeling system according to any one of claims 6-9, wherein the spatial analysis includes buffer analysis, superposition analysis, spatial statistical analysis, height analysis, angle analysis and area analysis.