20 results about "Urban model" patented technology

The invention relates to a three-dimensional live-action model generation method for city updating. The method comprises the following steps: collecting multi-source city image information, and obtaining semantic data according to the multi-source city image information; performing city modeling visualization according to the multi-source city image information to generate a city model; and matching the semantic data with the city model to obtain a three-dimensional real scene model containing the semantic data. According to the method, city information can be obtained more comprehensively by performing total factor accurate collection through a multi-source three-dimensional monitoring technology, the accuracy of a real scene model is improved, semantic data is matched with a city model, a three-dimensional real scene model containing the semantic data is obtained, multiple materials and textures of the model are combined, and the accuracy of the real scene model is improved. And the model is lightened, so that the purpose of reducing the resource loading time is achieved.

The invention provides a low-altitude Internet of Things design simulation system based on an urban CIM model, relates to the field of low-altitude flight, and solves the technical problem that the deviation between path planning and actual operation is large due to the fact that an existing simulation system cannot effectively support dynamic migration of a service function chain. The method comprises the following steps: constructing a city three-dimensional model through a CIM technology, and carrying out grid division on the city three-dimensional model; acquiring environment information; acquiring a grid basic safety risk index of the urban three-dimensional model based on the environment information; the method comprises the following steps: collecting low-altitude internet-of-things sensing data through a plurality of sensors, and preprocessing the low-altitude internet-of-things sensing data; constructing a risk model algorithm based on the grid basic security risk index and the low-altitude internet-of-things perception data; obtaining a comprehensive risk index of each grid through a risk model algorithm; and if the comprehensive risk index is greater than a preset risk threshold, sending a risk airspace early warning signal of the corresponding grid. The method is used in the low-altitude Internet of Things design simulation process.

The invention provides an urban inland inundation simulation method and a risk early-warning risk-avoiding system based on coupling of a one-dimensional model and a two-dimensional model. The method comprises the following steps: performing one-dimensional and two-dimensional hydrodynamic simulation on urban inland inundation rainstorm and flood based on SWMM and OpenFOAM; establishing a water exchange interface between the first model and the second model, dynamically calculating exchange flow according to a water level relationship, and establishing and executing a two-dimensional model coupling mechanism; based on a coupling mechanism, running simulation and outputting data and results; building an urban model based on a Cesium platform, and inputting flood routing data obtained based on model coupling to realize visual simulation of urban inland inundation flood routing; a risk early-warning risk-avoiding system is built on the basis of a visual result and in combination with emergency management theoretical knowledge and comprises a waterlogging simulation module, an early-warning module, a risk zoning module and a risk-avoiding transfer module; risk area division of a target area is realized based on double factors of water depth and flow velocity, and a corresponding optimal risk avoiding route is planned based on a Dijkstra algorithm.

The invention relates to the technical field of three-dimensional rendering, in particular to a digital city design city model visual display system which comprises a purpose calibration module, a component combination module, a path guide module, a view angle scheduling module and a rendering display module. According to the method, more accurate visual representation of urban model space purposes is realized by optimizing purpose calibration in the urban space and careful processing of geographic information, more reasonable space utilization distribution and visual display are realized by dynamically adjusting anchor points of the purpose space, more intelligent decision making in urban planning and building design is supported, and the method has the advantages of being high in practicability and easy to popularize. By extracting and combining building components with different functions, the functional semantic expression of the model is further enhanced, the information value and practicability of the model are enhanced, the interactivity and educational significance of the model are enhanced, and the model is more vivid visually and can reflect the appearance of a real city more accurately due to the improvement of rendering display. And the display quality and attraction of the model are improved.

The invention relates to the technical field of three-dimensional modeling and geographic information processing, and discloses a three-dimensional city model generation optimization method and system, and the method comprises the steps: obtaining a central city area three-dimensional data set of a target city; generating a second fusion data set of unified three-dimensional point cloud representation; based on the key feature point set, a random consistency verification mechanism is adopted to execute preliminary registration operation; and generating a high-precision three-dimensional city model. In the prior art, in a multi-source three-dimensional data fusion process, coordinate system offset and scale difference exist among an oblique photography image, LiDAR point cloud, BIM data and a topographic map, and especially under a large-scale central urban area modeling condition, high-precision and automatic unified alignment is difficult to realize. And dislocation of building boundaries or fracture of terrain curved surfaces are caused. Due to the fact that depth feature extraction and cross-source feature alignment are combined with random consistency verification, the space consistency and modeling reliability of the three-dimensional city model are improved.

The invention discloses a path planning method based on a city engine and an unreal engine. The method comprises the following steps: completing basic data preparation, rule definition, model generation and visual presentation and analysis, and establishing a city model; secondly, constructing a vehicle motion model in an unreal engine, and simulating weather; the three-dimensional static model and a dynamic model in an unreal engine are fused to generate an urban environment; carrying out geographical gridding on the urban area; introducing a trafficability map and physical restrictions of the vehicle, and setting the trafficability map of the vehicle; an improved A * algorithm based on geographic gridding is introduced, path planning is conducted, the improved A * algorithm is used, and path optimization is achieved through a heuristic function and a penalty function; and outputting the generated path plan.

The invention discloses a three-dimensional city generation method and device based on a satellite image, equipment and a medium, and the method comprises the steps: obtaining a satellite image of a city, and extracting an instance segmentation map and a depth map, thereby constructing a three-dimensional volume structure; extracting texture features and geometric features based on the three-dimensional volume structure; according to the texture features and the geometric features, a preset diffusion model is adopted to generate image frames of a plurality of visual angles; wherein the diffusion model carries out inter-frame feature aggregation through inter-frame consistency attention, and different scale features are processed through hierarchical geometric perception attention; performing consistency evaluation based on the image frames of the plurality of visual angles to obtain a consistency score; and based on the three-dimensional volume structure, performing three-dimensional reconstruction according to the consistency score, and generating a three-dimensional city model. According to the method, the generation efficiency and quality of the city-scale 3D scene can be effectively improved, and the problem of multi-view consistency of the city-scale large scene is solved.

The application relates to the technical field of three-dimensional rendering, in particular to a digital city design city model visual display system, which comprises a use calibration module, a component combination module, a path guiding module, a visual angle scheduling module and a rendering display module. In the application, through optimization of use calibration in city space and detailed processing of geographic information, more accurate visual performance of the use of the city model space is realized, through dynamic adjustment of the anchor point of the use space, more reasonable space utilization distribution and visual display are realized, more intelligent decision making in city planning and building design is supported, through extraction and combination of building components with different functions, the functional semantic expression of the model is further strengthened, the information value and practicability of the model are enhanced, the interactivity and educational significance of the model are strengthened, and the improvement of the rendering display makes the model more realistic in vision and more capable of accurately reflecting the appearance of a real city, thereby improving the display quality and attraction of the model.

The invention discloses a flood risk early warning grading standard method based on urban flood simulation forecast. The method is specifically implemented according to the following steps: step 1, constructing a grid city model; step 2, evaluating the disaster-bearing object capability of the grid city model in the step 1; 3, evaluating the waterlogging prevention capability in each grid unit in the grid city model in the step 1; 4, constructing a flood risk assessment model; step 5, constructing a flood risk grading early warning model, quantifying a risk value and a continuous trend of flood, and setting a triggering condition of risk early warning; and step 6, constructing a grading early warning model. According to the method, the problems that the dynamic process of urban flood occurrence cannot be accurately simulated and the matching degree with actual risk early warning is low in an existing grading method are solved, the urban flood risk grade can be accurately predicted and evaluated, and the accuracy and timeliness of early warning are improved.

The application relates to the technical field of urban planning and design, in particular to a model generation method suitable for urban planning and design, which comprises the following steps: S1, for a region to be modeled, a plurality of building topographic maps and height data of the region to be modeled are acquired and merged to generate a merged data map; S2, the merged data map is corrected to generate an intermediate design map; and S3, a city model is generated in the region to be modeled by using the intermediate design map and external facade data. The application has the beneficial effect that, in the process of constructing the city model, the building data in the region to be modeled is integrated and processed, and the places where errors exist among the plurality of buildings are excluded to generate the intermediate design map, so that the overall layout effect of the region to be modeled is more coordinated, the problem that design interference among the plurality of buildings is difficult to find and the effect is not unified when only a single building is designed is avoided, and better city model construction effect is achieved.

This invention discloses a method and system for dynamic monitoring of urban flood disasters based on big data, belonging to the field of disaster management technology. The method includes: constructing a three-dimensional urban model; decoupling and evaluating the structural, functional, and load vulnerability to form a disaster monitoring architecture; supervising and training disaster monitoring components based on this architecture and embedding them into an urban information platform to achieve intelligent learning of disaster probability dependence and vulnerability entropy; combining multi-source sensor data for joint evaluation to determine the disaster monitoring status in real time; and implementing intelligent management and targeted monitoring guidance for urban flood disasters based on the monitoring results. This invention solves the technical problems of existing urban flood monitoring methods lacking comprehensive evaluation and real-time dynamic monitoring of the complex urban environment, leading to delayed disaster identification and insufficient monitoring accuracy. It achieves the technical effect of a big data-driven three-dimensional disaster monitoring architecture, enabling multi-dimensional dynamic evaluation of urban flood disasters and improving disaster identification accuracy and response efficiency.

The application discloses a city model generation method and device, electronic equipment and a storage medium, comprising: acquiring city grid model data, and determining the main street corresponding to the city grid model data; acquiring the key view sequence corresponding to the main street, wherein the key view sequence comprises a plurality of virtual camera key views, the plurality of virtual camera key views are obtained by moving and shooting the virtual camera along the main street, and the distance interval of any two virtual camera key views in the plurality of virtual camera key views is the same; based on the key view sequence, a plurality of visual images are generated; for each visual image, each pixel point of the visual image is converted into a particle point in a world coordinate system to obtain a sparse particle field; the sparse particle field is densified to obtain a dense particle field; and based on the dense particle field, a city particle model is obtained. The application can improve the position accuracy of the particle, and accurately determine the geometric information of the building facade in the model.

The invention provides an adaptive model precision control method and system oriented to city-level multi-physics field simulation. The method comprises the following steps: aiming at urban simulation tasks such as a wind environment, a thermal environment, sunlight, a pedestrian flow, energy consumption and the like, reading regional models with different precision levels from an urban model library with multi-level detail levels as candidate models; based on the simulation target quantity corresponding to the simulation task, carrying out regional division on the city space, and calculating a regional sensitivity index according to the influence of the precision change of each regional model on the simulation target quantity; and determining a model precision grade adopted by each region according to a sensitivity priority principle by combining an error estimator introduced by model precision change and computing resource constraints. Through the above mode, on the premise of ensuring the reliability of a simulation result, the calculation scale of a low-sensitivity area is reduced, so that the overall simulation calculation amount and the calculation duration are reduced, and reasonable distribution of limited calculation power resources in urban simulation is realized.

The utility model relates to the field of urban planning, and discloses an urban planning design model display device, which comprises a shell, a mounting frame is mounted at the top of the shell, a model comparison mechanism is arranged on the inner wall of the shell, the model comparison mechanism comprises an adjusting assembly and an auxiliary shielding assembly, the adjusting assembly comprises a sliding plate, and the sliding plate is arranged on the mounting frame. The sliding plate is slidably connected to the inner wall of the shell, a first model is installed on the upper surface of the sliding plate, a push plate is arranged at the bottom of the sliding plate, a mounting plate is fixedly connected to the bottom of the push plate, and a second model is installed on the upper surface of the mounting plate. According to the utility model, through the arrangement of the model comparison mechanism, an unplanned city model and a preset planned city model can be compared, the interactivity and immersion of city planning display are increased, people can visually feel the effect after planning, and the practicability of the device is further improved.

The invention relates to the technical field of building information models, in particular to an urban building information model data building method, which comprises the following steps of: forming a real-time urban environment dynamic data set by collecting environment monitoring data such as temperature, humidity, vibration, displacement and the like; and based on the data set, performing change semantic association analysis in combination with an initial BIM model, identifying a building component needing to be updated through a semantic matching algorithm and a preset semantic association rule, and generating a model updating instruction set. And then geometric parameter correction, material attribute updating and semantic association adjustment are carried out on the BIM model according to the updating instruction, and finally the updated urban BIM model is obtained. According to the method, dynamic fusion of the BIM model and the real-time environment data can be realized, the management and operation and maintenance efficiency of the building is optimized, and the adaptability of the building to the environment change is improved.

The application discloses an interactive model system for urban land space planning based on double organization and development monitoring, and has the characteristics that the system comprises a public participation platform, a construction land screening module, an urban space planning growth module and an urban development monitoring module. The urban growth model based on geographic information technology is introduced into urban planning and design, a growth model framework with better applicability is constructed, and the research and construction cost of the model needs to be controlled for the urban model of small towns. The model structure based on logistic regression and interactive design is in line with the double organization characteristics of urban growth and construction. Through urban development monitoring, changes that may be encountered in the long-term development of the city can be predicted, and corresponding passive feedback mechanisms can be developed to make corresponding adjustments to the land space planning.

This application relates to the field of remote sensing image information processing, specifically disclosing a method for constructing a 3D urban model based on high-resolution stereo imaging satellite imagery. The method includes: extracting the top building outline of a target building from the satellite imagery; obtaining the top height information of the target building based on the corresponding Digital Surface Model (DSM) imagery; offsetting the top building outline to obtain the bottom building outline of the target building; and establishing a 3D model of the target building based on the bottom building outline and the top height information. This application utilizes satellite imagery to achieve rapid, efficient, and accurate construction of a 3D urban model at LOD 1.3.

The application discloses a kind of based on city model view content traversal identification's roof landscape evaluation method, belong to city planning technical field.The present application is in view of prior art deficiency, by in the city three-dimensional model batch export the view image of the city space of the view to be evaluated, and in considering export view, fully consider that city model can be traversed and positioned roof space viewpoint and look direction;Then by digging the label color data information in view, and then objectively measure the city each view landscape index under the view of this direction to reflect the visual features of roof view.The present application can quantitatively evaluate the look condition of each landscape element in roof view, provide scientific basis for city planning design.

This invention belongs to the field of nuclear emergency assessment and nuclear radiation protection technology, specifically involving a method, program, device, and storage medium for rapidly calculating characteristic parameters of transient nuclear radiation fields based on a gridded urban building model. This invention reduces the key input quantities required for rapid calculation of transient nuclear radiation doses in urban areas to calculable characteristic parameters and provides a unified calculation method for gridded urban scenarios. After completing Monte Carlo simulations under multiple real urban scenario conditions and jointly fitting the simulation results, a parameterized calculation formula can be obtained for a specific source term under specified source term height and global counter height conditions. Based on this, when assessing transient nuclear radiation fields in new urban scenarios, the urban radiation protection factor for each air grid cell count location can be directly obtained simply by using the urban model file of the GIS global urban building dataset and specifying the urban area and source term location.

The invention discloses a city model generation method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining city grid model data, and determining a main street corresponding to the city grid model data; a key view sequence corresponding to the main street is obtained, the key view sequence comprises a plurality of virtual camera key views, the virtual camera key views are obtained by moving and shooting a virtual camera along the main street, and the distance interval between any two virtual camera key views in the virtual camera key views is the same; generating a plurality of visual images based on the key view sequence; for each visual image, converting each pixel point of the visual image into a particle point under a world coordinate system to obtain a sparse particle field; densifying the sparse particle field to obtain a dense particle field; and based on the compact particle field, obtaining an urban pelletization model. According to the embodiment of the invention, the position precision of the particles can be improved, and the geometric information of the building facade in the model can be accurately determined.