A method for 3D digital display of urban assets

Abstract

This invention relates to a method for 3D digital display of urban assets, based on an eight-part model and ten-level spatial geographic boundaries, to present and express different categories of urban assets in three dimensions. The eight-part model includes hierarchical, categorical, segmented, block-based, building-based, layered, household-based, and zone-based classifications. The ten-level spatial geographic boundaries include city-level, district-level, street-level, community-level, grid-level, building-level, floor-level, room-level, block-level, and element-level classifications. This invention can dynamically express spatiotemporal two-dimensional and three-dimensional data from multiple sources and with different structures, loading content of interest into a 3D scene according to user needs, thereby reducing unnecessary memory usage in the system and enhancing user experience. It also solves problems such as high latency and slow loading speed in network data services, achieving the technical effects of small memory footprint, fast loading speed, comprehensive data types, excellent presentation effects, realistic digital expression, and easy updates.

Description

Technical Field

[0001] This invention belongs to the fields of computer information technology and three-dimensional geographic information system technology, and specifically relates to a method for three-dimensional digital display of urban assets. Background Technology

[0002] The continuous development of computer science and technology and 2D and 3D graphics rendering technology has given rise to a variety of graphics rendering engines. Existing graphics rendering engines, when used in building urban asset management systems, are mainly divided into four categories based on their application scenarios: game engines, BIM engines, GIS engines, and panoramic technology. However, each of these four types of graphics rendering engines has its own advantages and disadvantages. 1) Asset management systems based on game engine technology have certain advantages in scene expression, image quality and special effects and model granularity. The asset models are presented intuitively and vividly. Most of them are built on the C / S side, but they lack spatial reference under the geographic standard. They need to make separate game-based asset environment models. It is difficult to have strict individual and element-based classification and visualization conditions. It is also difficult to overlay standard GIS data, so it is impossible to perform accurate geographic calculations. 2) Asset management systems based on GIS technology focus more on using surveying and mapping geographic information data such as vector data, image slices, white model blocks and real-world 3D to express asset elements. For example, the presentation effect of asset management and analysis applications from above ground to underground, from indoor to outdoor and from 2D to 3D is better. However, for the display of scene indoor models, there are technical defects such as severe jagged edges, poor display effect and insufficient expression in terms of element classification and component management. 3) Asset management systems based on BIM technology can express individual project assets within a small local area in a refined manner. For example, various elements and components within assets such as subway projects, park projects, and factory projects can be independently displayed, filtered, classified, layered, measured, and sectioned by loading BIM model data exported from professional software, and have excellent display effects, but the cost is relatively high. 4) Asset management software systems built on indoor and outdoor panoramic technology are particularly simple. By using multi-lens image acquisition and dynamic image stitching technology, the sensor-acquired images are processed through feature matching, distortion correction, and color fusion. A VR engine is used to achieve 360° or 720° panoramic field of view coverage through fisheye lenses or wide-angle arrays. Finally, a single-page HTML file is built for external publication and display. Although this panoramic technology allows for manual annotation of internal icon points and lines, data acquisition and updates are relatively convenient, and its advantage in expressing current status is also very obvious, it has significant shortcomings and limitations in terms of multi-type asset elements, large-scale scene expression, and geospatial measurement and analysis.

[0003] Existing 3D digital asset management systems mostly integrate and apply the aforementioned technologies flexibly. For example, they use 2D maps or 3D scenes as the digital base, and the underlying engines are mostly 2D or 3D GIS engines. They also overlay technologies such as panoramic or BIM to achieve asset quantity statistics, dashboard large-screen display, and management analysis, thereby understanding the spatial distribution of assets. Web-based applications of 2D and 3D GIS systems are relatively convenient to deploy and update, and asset elements are expressed on the map through vector data map display and labeling or model loading. Currently, many large urban investment companies undertake the management and operation functions of urban public infrastructure and commercial assets. They are building asset revitalization and operation management systems to achieve dynamic investment promotion management and optimization of asset leasing status, ledger-based, digital, and visualized management.

[0004] Existing operational asset management systems, such as smart park asset management systems, parking lot resource digital management systems, debt asset management systems, and urban asset revitalization systems, mostly use 2D / 3D, game / GIS, and cloud-based / customer-localized graphics rendering engines. Depending on the management scale and the size of the area, the construction of existing asset management systems is difficult to meet the comprehensive and current requirements of model display effects, geographic measurement, multi-level scaling expression, asset element scene expression, classification management, dynamic updates, and statistical analysis. Moreover, the technology engines used are relatively simple.

[0005] Despite the significant development, progress, and application of existing real-scene 3D digitization technology, it still has shortcomings in terms of high graphics card configuration requirements for B / S mode clients, and in terms of creating large-scale multi-level browsing and seamless fast loading of scenes.

[0006] In summary, regarding the construction of urban asset operation and management systems, game engine technology has high requirements for model data production, can only present asset scenes within a specific local area, and cannot easily convert between game data and geospatial data, requiring the preparation of two sets of data, which is inconvenient for the dynamic updating and maintenance of asset geometric data. Although 2D and 3D GIS technologies have solid spatial reference framework support and can measure, calculate, and analyze assets in map scenes, they have significant shortcomings in expressing indoor element scene effects and in refined management and analysis. While BIM technology can achieve element classification, hierarchical grouping management and refined expression of individual assets with good presentation effects, it is highly dependent on professional BIM software. At the same time, BIM model production costs are high, and the requirements for the professional knowledge and operational experience of data production personnel are extremely high. Its scalability, replicability, flexibility, and speed in large-scale and batch model digitization generation are poor. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention empowers the construction of urban asset management systems through 3D digitization technology. It considers the presentation and expression of asset data elements at different scaling levels, combines the relevant requirements of asset management system construction with rich and comprehensive data resources, and integrates two multi-level display schemes—an eight-part model and a ten-level spatial boundary—to digitally present and express different categories of assets. This invention can solve problems such as the fusion and expression, on-demand presentation, and dynamic hierarchical classification of multi-source heterogeneous spatial data / models in urban assets, meeting the requirements of dynamic data updates, statistical analysis, and operation and maintenance management in business systems. It possesses high reusability, operability, flexibility, stability, and convenience in asset management system construction, dynamic data updates, and post-maintenance management.

[0008] This invention provides a method for three-dimensional digital display of urban assets, which uses an eight-level model and ten-level spatial geographic boundaries to present and express different categories of assets in three dimensions. The eight-level model includes hierarchical, categorical, segmented, block-based, building-based, layered, household-based, and zone-based methods. The ten-level spatial geographic boundaries include city-level, district-level, street-level, community-level, grid-level, building-level, floor-level, room-level, block-level, and element-level methods. The method includes the following steps: S1: Define the asset area scope for the construction of the city asset management system, and load remote sensing images or electronic map tile services at the city level as the initial scene base for presentation; S2: By adding boundary lines and map masks to the map scene, the asset area inside and outside is displayed in a differentiated comparison, highlighting the spatial boundary of the city asset management system and achieving focused field of view; S3: The city asset management system displays all assets located within the spatial boundary of the city asset management system by default. S4: Determine whether to display all assets of the city asset management system at this time? If yes, then all assets will be displayed: white model block modeling data generated based on vector shapefile modeling will be loaded as asset content into the current city asset management system scene, and static or dynamic style rendering will be performed according to asset category. Different colors will be used to distinguish various categories of existing assets and corresponding legends will be added. S5: If you select No, then select the asset class to display; S6: If you choose to display a single type of asset, firstly, use vector data to spatially position and display the asset number of the single type of asset according to the asset management needs; secondly, set an appropriate zoom level range according to the requirements. The zoom level includes a low zoom level and a high zoom level. At the low zoom level, only the asset number is displayed. At the high zoom level, the asset name, asset point, asset boundary line and asset range surface are displayed, so as to quickly display the spatial location and distribution of the single type of asset and the global overview in the three-dimensional scene. S7: In the case of displaying the single type of asset, statistical information can be presented based on the urban asset management system panel. Within the map's visible range, the corresponding image slices of the single type of asset and the individualized real-world 3D assets can be loaded as needed, thereby intuitively and prominently displaying the current status of the single type of asset. S8: Employs dynamic image tiling technology to achieve hierarchical dynamic loading of map scenes: First, crop images using thematic vector ranges and retain only images within the thematic element range; then, automatically crop the images and quickly publish the tiling service. S9: Employing real-scene 3D single-unit segmentation and merging technology to achieve on-demand individual display of real-scene 3D models: First, images are captured from several angles by a drone equipped with an oblique camera and processed by professional software to generate real-scene 3D models; second, the real-scene 3D models are single-unitized and cropped according to vector range, and then the single-unitized real-scene 3D models are merged and indexed according to type, thereby achieving individual display of the real-scene 3D models as needed; S10: Optimize the real-world 3D model data by slicing the model, adjusting the texture format, compressing vertices, and building a top layer to reduce the amount of data. After optimizing the data, the loading speed is faster. S11: When viewing a single asset, business attribute data, including basic information and building list, are displayed as an overview. In addition, introductory pictures, plan documents and video materials related to the single asset can be displayed as needed to provide information-assisted decision-making and management analysis support for asset management departments. S12: When viewing the floor plan and unit-by-unit interior model of the individual asset, a 3D interior model is constructed using CAD floor plan. First, the original photos collected on site are used to texture the 3D interior model. Second, functional areas are labeled according to the actual situation on site. Third, the 3D interior model is improved in terms of effect, data optimization, and position matching. Finally, the 3D interior model is sliced. S13: When viewing different functional areas within a single room, the vector data is optimized and organized using functional area division technology. The city asset management system automatically matches the location of all rooms and can use different colored floor tiles in the indoor 3D model to distinguish and display various indoor information attributes, including room number and area. S14: When viewing a single indoor or outdoor panorama, panoramic data production technology is used to create and display panoramic images: indoor panoramas are created by stitching together panoramic images captured by a camera in a 360° rotation, generating HTML5 slice format; outdoor panoramas are created by stitching together panoramic images after drone aerial photography to achieve a 720° display with annotations for all-around display.

[0009] In step S6, displaying the asset name, asset point, asset boundary line, and asset extent area at the high zoom level refers to displaying the location, boundary, and coverage area of ​​different types of assets, including buildings, land, and factories, through points, lines, and surfaces.

[0010] Vertex compression in step S10 refers to reducing the number of geometric vertices.

[0011] The construction of the top layer in step S10 refers to the top layer data of the real scene 3D data. The top layer data needs to be processed when dynamically loaded in the 3D system. According to the needs of the display content, the necessary content is merged into the top layer data to achieve the effect of being displayed first.

[0012] Further, the low scaling levels in step S6 include 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12.

[0013] Low zoom levels are a fundamental concept in map visualization, referring to tile layers with lower zoom levels (smaller zoom level values) used to display large-scale, overview-like geographic information. In the map zoom level system, zoom levels typically start from 0 and increase incrementally, with smaller values ​​representing lower levels. Low zoom levels cover a wide geographic area but display less detail, making them suitable for global overviews or initial location positioning.

[0014] Furthermore, the high scaling levels in step S6 include 13, 14, 15, 16, 17, 18, 19, 20, and 21.

[0015] The term "high zoom level" refers to a higher zoom level in the map display. It corresponds to a more detailed map view, but displays a smaller geographical area. The higher the zoom level value, the richer the map detail, but the smaller the displayed latitude and longitude range.

[0016] Furthermore, the statistical information in step S7 includes total assets, total asset area, asset targets, asset plans, asset revitalization progress, and asset benefits.

[0017] Furthermore, the individual segmentation technology path in steps S7 and S9 includes real-scene individual segmentation, slice individual segmentation, building individual segmentation, and floor individual segmentation, while supporting dynamic image cropping and dynamic segmentation and merging of real-scenes with custom polygon ranges.

[0018] Furthermore, step S12, which involves enhancing the effect, optimizing the data, and matching the location of the indoor 3D model, includes: rendering the indoor scene by creating lights and optimizing material textures, uniformly baking the indoor scene to reduce the number of textures, and performing location matching with reference to the real-world 3D model.

[0019] Compared with existing technologies, the present invention provides a three-dimensional digital urban asset data display scheme that integrates multi-source heterogeneous data resources at different scales, including base maps, white models, slices, vectors, real scenes, hierarchical and unit-specific models, and functional areas, into an urban asset system encompassing an eight-part model and a ten-level spatial geographic boundary. The advantages of this scheme are as follows: In terms of display effect, the present invention can fully integrate panoramic, real scene and GIS technologies to solve the problem of detailed presentation of asset elements under comprehensive / thematic categories, and facilitate hierarchical authorization to express asset element results in three-dimensional scenes as needed; In terms of data maintenance, this invention can quickly and flexibly update the asset display data as needed and in real time, thereby meeting the functional requirements of complex statistics, comprehensive analysis, scenario building, and case demonstration in asset revitalization business scenarios. In terms of technology application, this invention adopts an open and inclusive approach and combines multiple application tools to meet user function building and data processing requirements.

[0020] In summary, this invention can dynamically express spatiotemporal two-dimensional and three-dimensional data from multiple sources and with different structures, and load content of interest into a three-dimensional scene according to user needs, thereby reducing unnecessary memory usage in the system and enhancing user experience. At the same time, it can solve problems such as high latency and slow loading speed of network data services, achieving the technical effects of small memory usage, fast loading speed, complete data types, excellent presentation effect, realistic digital expression and easy updating. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating a preferred embodiment of the urban asset 3D digital display method of the present invention; Figure 2 This is a schematic diagram illustrating the use of an eight-part three-dimensional digital model and ten-level spatial geographic boundaries to present and express different categories of assets in a multi-level digital representation of a preferred embodiment of the urban asset three-dimensional digital display method of the present invention. Figure 3This is a schematic diagram of the macroscopic display of all existing assets in the entire region in a preferred embodiment of the urban asset 3D digital display method of the present invention; Figure 4 This is a schematic diagram illustrating the rapid display of the spatial location and distribution of various carrier assets in a three-dimensional scene in a preferred embodiment of the urban asset three-dimensional digital display method of the present invention. Figure 5 This is a schematic diagram of the current status of a single type of asset, presented in a preferred embodiment of the urban asset 3D digital display method of the present invention. Figure 6 This is a schematic diagram of a single building display in a preferred embodiment of the urban asset 3D digital display method of the present invention; Figure 7 This is a schematic diagram of the layered household model and functional area display in a preferred embodiment of the urban asset three-dimensional digital display method of the present invention; Figure 8 This is a schematic diagram of a preferred embodiment of the urban asset three-dimensional digital display method of the present invention, which uses aerial photography to achieve a 720°+ annotation-based all-round display of existing land parcel information; Figure 9 This is a schematic diagram of a 360° panoramic indoor display of key assets in a preferred embodiment of the urban asset 3D digital display method of the present invention. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] To address the aforementioned problems in the prior art, this invention provides a method for three-dimensional digital display of urban assets, such as... Figure 1 and Figure 2 As shown, different categories of assets are presented and expressed in three dimensions based on an eight-level model and ten-level spatial geographic boundaries. The eight-level model includes hierarchical, categorical, segmented, block-based, building-based, layered, household-based, and zone-based classifications. The ten-level spatial geographic boundaries include city-level, district-level, street-level, community-level, grid-level, building-level, floor-level, room-level, block-level, and element-level classifications. The process includes the following steps: S1: Define the asset area scope for the construction of the city asset management system, and load remote sensing images or electronic map tile services at the city level as the initial scene base for presentation; S2: By adding boundary lines and map masks to the map scene, the asset area inside and outside is displayed in a differentiated comparison, highlighting the spatial boundary of the city asset management system and achieving focused field of view; S3: The city asset management system displays all assets located within the spatial boundary of the city asset management system by default. See [link / reference] Figure 3 ; S4: Determine whether to display all assets of the city asset management system at this time? If yes, then all assets will be displayed: white model block modeling data generated based on vector shapefile modeling will be loaded as asset content into the current city asset management system scene, and static or dynamic style rendering will be performed according to asset category. Different colors will be used to distinguish various categories of existing assets and corresponding legends will be added. S5: If you select No, then select the asset class to display; S6: If you choose to display a single asset type, firstly, use vector data to spatially position and number the asset according to asset management needs; secondly, set an appropriate zoom level range according to requirements. The zoom level includes a low zoom level and a high zoom level. At the low zoom level, only the asset number is displayed; at the high zoom level, the asset name, asset points, asset boundary lines, and asset extent area are displayed. This allows for quick display of the spatial location and distribution of the single asset type, as well as a global overview, in a 3D scene. See [link / reference] Figure 4 ; S7: In the case of displaying the single type of asset, statistical information can be presented based on the city asset management system panel. Within the map's visible range, corresponding image slices and individualized 3D real-world assets of the single type of asset can be loaded as needed, thereby intuitively showcasing the current status of the single type of asset. (See [link]). Figure 5 ; S8: Employs dynamic image tiling technology to achieve hierarchical dynamic loading of map scenes: First, crop images using thematic vector ranges and retain only images within the thematic element range; then, automatically crop the images and quickly publish the tiling service. S9: Employing real-scene 3D single-unit segmentation and merging technology to achieve on-demand individual display of real-scene 3D models: First, images are captured from several angles using a drone equipped with a tilting camera, and then processed by professional software to generate real-scene 3D models; second, the real-scene 3D models are single-unitized and cropped according to vector range, and then the single-unitized real-scene 3D models are merged and indexed according to type, thereby enabling the individual display of the real-scene 3D models as needed. See [link to relevant documentation]. Figure 6 ; S10: Optimize the real-world 3D model data by slicing the model, adjusting the texture format, compressing vertices, and building a top layer to reduce the amount of data. After optimizing the data, the loading speed is faster. S11: When viewing a single asset, business attribute data, including basic information and building list, are displayed as an overview. In addition, introductory pictures, plan documents and video materials related to the single asset can be displayed as needed to provide information-assisted decision-making and management analysis support for asset management departments. S12: When viewing the floor plan and individual unit interior model of the single asset, a 3D interior model is constructed using CAD floor plans. First, textures are applied to the 3D interior model using original photos collected on-site. Second, functional areas are labeled according to the actual on-site conditions. Third, the 3D interior model is enhanced in terms of effect, data optimization, and location matching. Finally, the 3D interior model is sliced. See [link to relevant documentation]. Figure 7 ; S13: When viewing different functional areas within a single room, functional area division technology is used to optimize and organize the vector data. The urban asset management system automatically matches the locations of all rooms and can use different colored floor tiles in the interior 3D model to distinguish and display various interior information attributes, including room number and area. See [link to relevant documentation]. Figure 7 ; S14: When viewing a single indoor / outdoor panorama, panoramic data production technology is used to create and display panoramic images: Indoor panoramas are stitched together from 360° camera shots, generating HTML5 tile format; outdoor panoramas are achieved by stitching together panoramic images from drone aerial photography to provide a 720° display with annotations for a comprehensive view. See [link to documentation]. Figure 8 and Figure 9 .

[0024] In step S6, displaying the asset name, asset point, asset boundary line, and asset extent area at the high zoom level refers to displaying the location, boundary, and coverage area of ​​different types of assets, including buildings, land, and factories, through points, lines, and surfaces.

[0025] Vertex compression in step S10 refers to reducing the number of geometric vertices.

[0026] The construction of the top layer in step S10 refers to the top layer data of the real scene 3D data. The top layer data needs to be processed when dynamically loaded in the 3D system. According to the needs of the display content, the necessary content is merged into the top layer data to achieve the effect of being displayed first.

[0027] Optionally, the low scaling levels in step S6 include 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12.

[0028] Low zoom levels are a fundamental concept in map visualization, referring to tile layers with lower zoom levels (smaller zoom level values) used to display large-scale, overview-like geographic information. In the map zoom level system, zoom levels typically start from 0 and increase incrementally, with smaller values ​​representing lower levels. Low zoom levels cover a wide geographic area but display less detail, making them suitable for global overviews or initial location positioning.

[0029] Optionally, the high scaling levels in step S6 include 13, 14, 15, 16, 17, 18, 19, 20, and 21.

[0030] The term "high zoom level" refers to a higher zoom level in the map display. It corresponds to a more detailed map view, but displays a smaller geographical area. The higher the zoom level value, the richer the map detail, but the smaller the displayed latitude and longitude range.

[0031] Optionally, the statistical information in step S7 includes total assets, total asset area, asset targets, asset plans, asset revitalization progress, and asset benefits.

[0032] Optionally, the individual segmentation technology path in steps S7 and S9 includes real-scene individual segmentation, slice individual segmentation, building individual segmentation, and floor individual segmentation, while supporting dynamic image cropping and dynamic real-scene segmentation and merging with custom polygon ranges.

[0033] Optionally, step S12, which involves enhancing the effect, optimizing the data, and matching the location of the indoor 3D model, includes: rendering the indoor scene by creating lights and optimizing material textures, uniformly baking the indoor scene to reduce the number of textures, and performing location matching with reference to the real-world 3D model.

[0034] This invention supports efficient management and statistical analysis of different asset categories in an integrated, diversified, spatialized, and digital manner. The hierarchical and unit-based model of this invention can support the display of interior layout and room layout information through dynamic drawer pulling or upward lifting, and form a comprehensive display solution from macro to micro, from virtual to reality, and from external to internal perspectives by combining panoramic views.

[0035] This invention comprehensively utilizes various technical means and leverages multi-source heterogeneous data to achieve refined asset management and digital element representation, reflecting the value of urban asset management concepts and new productivity in the new era, and powerfully promoting the technological progress and development of urban asset management systems.

[0036] The present invention relates to the definitions of abbreviations, English terms, and key terms: GIS (Geographic Information System): A geographic information system.

[0037] BIM (Building Information Model): Building Information Model.

[0038] VR (Virtual Reality): Virtual reality.

[0039] C / S (Client / Server): Client / Server.

[0040] B / S (Browser / Server): Browser / Server.

[0041] shp (shapefile): A data format for vector feature files.

[0042] The technical solutions described above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for three-dimensional digital display of urban assets, characterized in that, Based on an eight-level model and ten-level geospatial boundaries, different categories of assets are presented and expressed in three dimensions. The eight-level model includes hierarchical, categorical, segmented, block-based, building-based, layered, household-based, and zone-based classifications. The ten-level geospatial boundaries include city-level, district-level, street-level, community-level, grid-level, building-level, floor-level, room-level, block-level, and element-level classifications. The process includes the following steps: S1: Define the asset area scope for the construction of the city asset management system, and load remote sensing images or electronic map tile services at the city level as the initial scene base for presentation; S2: By adding boundary lines and map masks to the map scene, the asset area inside and outside is displayed in a differentiated comparison, highlighting the spatial boundary of the city asset management system and achieving focused field of view; S3: The city asset management system displays all assets located within the spatial boundary of the city asset management system by default. S4: Determine whether to display all assets of the city asset management system at this time? If yes, then all assets will be displayed: white model block modeling data generated based on vector shapefile modeling will be loaded as asset content into the current city asset management system scene, and static or dynamic style rendering will be performed according to asset category. Different colors will be used to distinguish various categories of existing assets and corresponding legends will be added. S5: If you select No, then select the asset class to display; S6: If you choose to display a single type of asset, firstly, use vector data to spatially position and display the asset number of the single type of asset according to the asset management needs; secondly, set an appropriate zoom level range according to the requirements. The zoom level includes a low zoom level and a high zoom level. At the low zoom level, only the asset number is displayed. At the high zoom level, the asset name, asset point, asset boundary line and asset range surface are displayed, so as to quickly display the spatial location and distribution of the single type of asset and the global overview in the three-dimensional scene. S7: In the case of displaying the single type of asset, statistical information can be presented based on the urban asset management system panel. Within the map's visible range, the corresponding image slices of the single type of asset and the individualized real-world 3D assets can be loaded as needed, thereby intuitively and prominently displaying the current status of the single type of asset. S8: Employs dynamic image tiling technology to achieve hierarchical dynamic loading of map scenes: First, crop images using thematic vector ranges and retain only images within the thematic element range; then, automatically crop the images and quickly publish the tiling service. S9: Employing real-scene 3D single-unit segmentation and merging technology to achieve on-demand individual display of real-scene 3D models: First, images are captured from several angles by a drone equipped with an oblique camera and processed by professional software to generate real-scene 3D models; second, the real-scene 3D models are single-unitized and cropped according to vector range, and then the single-unitized real-scene 3D models are merged and indexed according to type, thereby achieving individual display of the real-scene 3D models as needed; S10: Optimize the real-world 3D model data by slicing the model, adjusting the texture format, compressing vertices, and building a top layer to reduce the amount of data. After optimizing the data, the loading speed is faster. S11: When viewing a single asset, business attribute data, including basic information and building list, are displayed as an overview. In addition, introductory pictures, plan documents and video materials related to the single asset can be displayed as needed to provide information-assisted decision-making and management analysis support for asset management departments. S12: When viewing the floor plan and unit-by-unit interior model of the individual asset, a 3D interior model is constructed using CAD floor plan. First, the original photos collected on site are used to texture the 3D interior model. Second, functional areas are labeled according to the actual situation on site. Third, the 3D interior model is improved in terms of effect, data optimization, and position matching. Finally, the 3D interior model is sliced. S13: When viewing different functional areas within a single room, the vector data is optimized and organized using functional area division technology. The city asset management system automatically matches the location of all rooms and can use different colored floor tiles in the indoor 3D model to distinguish and display various indoor information attributes, including room number and area. S14: When viewing a single indoor or outdoor panorama, panoramic data production technology is used to create and display panoramic images: indoor panoramas are created by stitching together panoramic images captured by a camera in a 360° rotation, generating HTML5 slice format; outdoor panoramas are created by stitching together panoramic images after drone aerial photography to achieve a 720° display with annotations for all-around display.

2. The method for three-dimensional digital display of urban assets according to claim 1, characterized in that, The low-scaling levels in step S6 include 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12.

3. The method for three-dimensional digital display of urban assets according to claim 1, characterized in that, The high scaling levels in step S6 include 13, 14, 15, 16, 17, 18, 19, 20, and 21.

4. The method for three-dimensional digital display of urban assets according to claim 1, characterized in that, The statistical information in step S7 includes total assets, total asset area, asset targets, asset plans, asset revitalization progress, and asset benefits.

5. The method for three-dimensional digital display of urban assets according to claim 1, characterized in that, The individual segmentation technology path in steps S7 and S9 includes individual segmentation of real scene, individual segmentation of slice, individual segmentation of building, and individual segmentation of floor. It also supports dynamic cropping of images with custom polygon range and dynamic segmentation and merging of real scene.

6. The method for three-dimensional digital display of urban assets according to claim 1, characterized in that, The steps S12 for enhancing the effect, optimizing the data, and matching the location of the indoor 3D model include: rendering the indoor scene by creating lights and optimizing material textures, uniformly baking the indoor scene to reduce the number of textures, and matching the location with reference to the real-world 3D model.

Images