78 results about "Urban model" patented technology

Disclosed herein is a 3D urban modeling apparatus and method. The 3D urban modeling apparatus includes a calibration unit for calibrating data about a translation and a rotation of at least one capturing device at a time that input aerial images and terrestrial images were captured. A building model generation unit generates at least one 3D building model based on the aerial images and the terrestrial images to which results of the calibration have been applied. A terrain model generation unit generates a 3D terrain model by converting an input digital elevation model into a 3D mesh. A texture extraction unit extracts textures related to the building model and the terrain model from the aerial images and the terrestrial images. A model matching unit generates a 3D urban model by matching the building model with the terrain model, which are based on the textures, with each other.

The present invention relates to a computational fluid dynamics (CFD) and multi-data sources-based urban real-time global environment estimation method. The method is based on historical data of urban environment monitor stations, global mesoscale meteorological forecast results, national meteorological data, urban major pollutant source data, a urban geographical three-dimensional model and road surface real-time monitor data of a motor vehicle exhaust detection system, CFD is used as a calculation engine, an environment quality mode is adaptively switched according to meteorological information, a multiscale grid discrete urban model is used, a multi-component pollution model is introduced, and a meteorological dry and wet settlement process is considered, so as to establish an urban global air and environment quality real-time estimation method. The urban environment quality estimation method is much better than existing methods in comprehensiveness, accuracy and real-time performance.

The invention provides a real-time hybrid real urban service realization method and system based on online and offline fusion. The method comprises: urban information collected in real time through aninternet-of-everything-based urban sensing network is obtained and analyzed to form an urban big data stream; a virtual urban scene corresponding to a real urban scene is established and the obtainedurban big data stream is matched and displayed in the virtual urban scene to construct a dynamic virtual urban scene corresponding to the real scene precisely; and on the basis of the dynamic virtualurban scene, interactive mode and urban service application construction is carried out. According to the invention, the urban service system with virtual-reality fusion and online-offline fusion isrealized; situations of all blocks of the city are obtained precisely in the virtual city model and processing of various complicated data is avoided; the information display mode in the virtual sceneis not limited; and observation and decision making can be carried out conveniently. Therefore, the user experience, service quality and interaction of the urban service can be improved comprehensively.

The invention discloses an urban CA model parameter optimization method based on a biogeographic optimization algorithm, and the method comprises the steps: carrying out the rasterizing of an urban present land-use map, enabling each grid to be corresponding to one cell, and building a land-use matrix; extracting the urban land-use change and spatial variable data, carrying out spatial sampling, and obtaining a training sample; building the function relation between a spatial variable and urban expansion, and constructing a fitness function through employing the difference between a function fitting value and a true value; initializing parameters of a BBO algorithm, employing the BBO algorithm for training according to historical sample data, obtaining a variable weight, and calculating the urban development probability; building a transformational rule of a BBO-CA model, and calculating the final cell transformation probability of each cell according to the transformational rule of a non-urban cell; and carrying out urban expansion simulation based on a built BBO-CA model. The method constructs a biogeographic optimization cell automatic machine model, enables the model to be used in urban expansion simulation, and facilitates more true and accurate simulation of urban development.

The invention discloses a satellite positioning method in urban canyons based on 3D urban model assistance. The satellite positioning method belongs to the technical field of satellite positioning andnavigation. According to the satellite positioning method, data is acquired in different scenarios to generate a historical training data set and threshold signals are eliminated, a reliable satellite signal reception type judging rule is generated by means of a decision-making tree, candidate positions are screened through comparing an inversion result of a candidate position received signal type and a judging rule prediction result, a final positioning result is determined through correcting errors caused by multi-path and non-line-of-sight received signals by adopting a method based on pseudo-range similarity, and the precision of satellite positioning in the urban canyons is improved.

A demonstration device and a demonstration method for urban public security multi-disaster secondary derivation coupling simulation belong to the technical field of public security simulation. The demonstration device comprises a dynamic sand table, a projection device and a control system. An urban model is arranged on the dynamic sand table, a movable lift and a vibration instrument are arranged at positions inside the dynamic sand table. A detecting device is arranged on the dynamic sand table, and the projection device is divided into a dynamic sand table projector, a three-dimensional animation projector and a horizontal projection screen. By means of a method based on three-screen linkage by combining a physical model and a virtual three-dimensional image, demonstration of experiments and value simulation results of happening and developing rules under the conditions of urban multiple emergency events and coupling of the events is achieved. Dynamic demonstration of links of disaster field simulation reappearance, monitoring, information delivering, information access, predicting, pre-warning and decision control and the like are achieved. Visual presentation means are provided for the disaster reappearance, risk evaluation, scene deduction, pre-arranged planning practice, education and training and the like.

The invention discloses a mass three-dimensional digital urban model organization and management method, which comprises the following steps of: framing a range according to a large-scale urban topographic map, and using each frame as a later-stage update unit for data making, storing and filing; when the data is imported to a database, performing quadtree partitioning according to the data range, and making all data block files smaller than a certain threshold value; establishing a data index structure of a spatial quadtree, wherein each node record comprises an external cube of the node; and when a three-dimensional data scene is displayed, rapidly judging whether the cube of the node meets the display demands of the current visual angle and distance in a quadtree node index mode. Therefore, the mass three-dimensional digital urban model organization and management method has the advantages of ensuring data consistency, providing convenience for data update and maintenance and improving the data loading and displaying efficiency.

The invention provides a power line carrier intelligent monitoring method for an urban model, and the method is characterized in that the method comprises the following steps: S1, building a two-dimensional model of an urban road and a building based on an artificial intelligence network; s2, manufacturing a city model object according to the two-dimensional model in the step S1, and arranging a light-emitting device at the position of the electric power equipment or the electric appliance in the road and the building of the model object; s3, constructing an urban power line carrier signal transmission system, and establishing an urban power line carrier intelligent monitoring model; and S4, monitoring the power operation state of the city in real time according to the model established in the step S3. According to the invention, through video shooting of the light-emitting 3D printing city model and identification of the artificial intelligence model, the real-time visual spatial and temporal distribution monitoring of the city power operation state can be obtained, and intelligent monitoring of the city power operation state is realized.

Te invention discloses a three-dimensional model multi-detail-level structure based on extension combination. According to the structure, segmentation is conducted on a three-dimensional model especially a three-dimensional urban model or a three-dimensional commodity display model by means of a semantic net, and the parts of the model obtained through segmentation are grouped; a Delaunay triangulation network is generated for each group to detect the adjacent relations between models in a three-dimensional scene, the extension combination algorithm is conducted on adjacent nodes, and a multi-detail-level model GroupTree is constructed; during dynamic visualization, the detail level required is calculated by monitoring the distance between the current user viewpoint and a group and the angle between the sight and the group, and corresponding nodes in the multi-detail-level model GroupTree are loaded dynamically; in this way, dynamic comprehensive simplification of the model is achieved, and visualization efficiency is improved.

The invention provides an urban greening modeling method which can be used for analyzing the urban aerial images and applying the afforestation plan obtained by the analysis into an urban model. The method comprises the steps of (1) analyzing the urban aerial images, and extracting the distribution situation of streets, buildings and vegetation on the urban aerial images; (2) analyzing the distribution situation of the streets, the buildings and the vegetation, and building a Gibbs distribution model of the vegetation; (3) putting the vegetation into the urban model by the Gibbs distribution model of the vegetation through a Monte Carlo-Markov chain mapping method according to the preset greening coverage degree. The urban greening modeling method can automatically complete the vegetation distribution in the urban model, and greatly reduces the work load of manually adding the vegetation into the urban model under the premise of being closer to the actual urban vegetation distribution situation.

The invention relates to a method for dynamically updating a three-dimensional urban model database in an event driving way. The method comprises the following steps of: A1, defining an event type causing dynamic variation of three-dimensional urban model data, and establishing an event describing template; A2, performing data standardization operation on three-dimensional urban model data to be updated; A3, performing automatic variation detection and self-adaptive matching on three-dimensional element objects, and collecting the variation information of the three-dimensional element objects; A4, interactively adding events causing variations of the three-dimensional element objects and relations among the events; A5, updating the databases of the varied three-dimensional element objects according to an event time sequence; A6, recalculating and updating semantic topological relation data among three-dimensional space objects; A7, reestablishing and updating three-dimensional space index data; and A8, finishing updating of the three-dimensional urban model database. Due to the adoption of the method for dynamically updating the three-dimensional urban model database in the event driving way, the database updating efficiency can be increased, and space-time inquiry and analysis application of multi-temporal data are supported effectively.

The invention discloses a dynamic 3D city model construction method for city canyon environment navigation. The method comprises two steps of static refined 3D city model construction and dynamic optimization of a 3D city model based on position information generated by visual/GNSS/3D model fusion. According to the method, the fusion result based on the airborne visual information/GNSS/3D map in the current epoch is obtained in real time and is applied to the visual loopback detection step, so that the urban 3D model database is dynamically updated by utilizing the information after final map optimization. In addition, a result obtained in real time and fused in the current epoch based on airborne visual information/GNSS/3D map is applied to the visual loopback detection step, so that the urban 3D model database is dynamically updated by using the information after final map optimization, the precision of the 3D urban model is improved, and the accuracy of the urban model is improved. And moreover, the problem of hysteresis of traditional 3D city model information is solved, and finally, important guarantee is provided for high-precision positioning of the city environment.

The disclosed embodiments use 3D city models and shadow mapping to improve altitude fixes in urban environments. In an embodiment, a method comprises: generating a set of three-dimensional (3D) candidate positions in a geographic area of interest; predicting global navigation satellite system (GNSS) signal visibility at selected ones of the 3D candidate positions; receiving GNSS signals at a current location of the mobile device; determining observed satellite visibility based on the received GNSS signals; comparing the predicted satellite visibility with the observed satellite visibility; determining a position fix based on a result of the comparing; determining an indoor environment where the mobile device is located based at least on an altitude component of the position fix; obtainingstructural data for the identified indoor environment; and determining a floor lower bound for the current location of the mobile device based on the altitude component and the structural data.

The invention provides a method oriented to land utilization and traffic multi-scale simulation, and belongs to the technical field of urban planning. The method is characterized in that a macroscopic model is combined with a microscopic model on the basis of a land utilization and traffic integration theory, a system dynamics model theory, an irregular cellular automata model theory and a scenario planning theory, and urban social economic data is adopted, so that urban land evolution and traffic system evolution can be simulated. An aggregation result generated by the macroscopic model is applied to the allocation of the microscopic model in order to construct a model which has a system aspect, an individual aspect and macroscopic and microscopic features and is more accordant with the urban general development law and the people-oriented urban planning thought. A frontier research irregular cellular automata model in the neighborhood of an urban model is combined with a conventional traffic four-phase model in order to construct a microscopic land utilization and traffic integration model based on a specific evolution rule, so that different scenario planning can be analyzed and predicted more specifically.

The invention relates to an intelligent design system for a building structure. The intelligent design system comprises a building data reading module, an expert system module, a parameterized image platform module, a structure calculation module, a structure optimization module, a construction drawing module, a refined construction module and an urban CIM model module. According to the method, the whole process from building data input to construction drawing generation can be automatic and intelligent, so that the technical requirements of talents are reduced, the labor cost is reduced, the design efficiency is improved, and a design result has better structural rationality and economical efficiency. Meanwhile, engineering design and construction information are converted into a city CIM model, support is provided for later smart city operation and maintenance, and development of a digital city is promoted.

The invention discloses an intelligent management system and method for urban carbon interrogation, and relates to the technical field of urban carbon interrogation. The IPCC module calculates the carbon emission density according to the historical statistical data of the target city; the real-time correction module calculates a real-time correction parameter according to the sampling data of the sampling area and the carbon emission density; the real-time carbon emission module obtains real-time statistical data of the multiple target areas, and calculates the real-time carbon emission of each target area according to the carbon emission density, the real-time correction parameters and the real-time statistical data; the GIS city model displays the real-time carbon emission of each target area. According to the method, the carbon emission density is calculated through the historical statistical data of the target city, the data are sampled to correct the carbon emission density, then the real-time carbon emission of each target area can be calculated according to the real-time statistical data of the target area, and the real-time carbon emission of each target area of the target city can be visually displayed through the GIS city model. And a basis is provided for the target city to explore a carbon reduction path.

The invention relates to a city design digitization and visualization interaction system, and belongs to the field of city design. The system comprises a visual database used for storing city model visual data; the user login module is used for a user to log in; the interactive server is used for calling the city model visual data in the visual database after a user logs in, and displaying the city model visual data to the user; and the interaction server is also used for receiving the opinion information input by the user and transmitted by the user login module, and storing the opinion information. After people log in the system through the user login module, opinion information is input into the system, the interaction server obtains and stores the opinion information, designers can check the opinion information conveniently, and therefore the city design better meeting the requirements of people is designed. The method has the effect of conveniently improving the city design quality.

The invention provides a method and system for the seeding operation technology of a ground smoke-generating furnace for artificial enhancement of rain and snow. Numerical simulation and analysis areperformed on atmospheric diffusion under the action of AgI catalysts based on an ADMS urban model numerical mode, the method and system for the seeding operation technology of the ground smoke-generating furnace for artificial enhancement of rain and snow are studied and established through combination of practice and experience indexes. Through the method, the technical problem that the amount ofthe AgI catalysts cannot be determined in a targeted mode during operation of an existing ground smoke-generating furnace for artificial enhancement of rain and snow can be solved to a maximum extentunder the conditions of different weather and environments, and the operation of the ground smoke-generating furnace for artificial enhancement of rain and snow can be more scientific, more effective, simpler and easier through the method; moreover, loss and waste which are caused by blind operation, artificial rain bombs and other resources can be reduced greatly, effects of effective protectionand development of water resources in the air are achieved, foundations are laid for scientific and effective implementation of the seeding operation, the scientificity of seeding operation of artificial enhancement of rain and snow through the ground smoke-generating furnaces can be improved greatly, and the purposes of reduction of atmospheric pollution and restoration of the ecological environment are achieved.