135 results about "Digital Earth" patented technology

The invention provides a three-dimensional digital earth-space data organizing and rendering method based on a quad-tree index, which belongs to the technical fields of cartography, geography information systems and virtual reality. The method comprises the following steps of: unifying common spatial data formats under multi-scale and multi-projection conversion, multispectral, multi-temporal and high-resolution remote sensing satellite images and aerial images as well as digital thematic maps with different scales into same coordinate system, carrying out operation on the attribute of each element and the parameter regulation of quad-tree tiles, outputting in the form of the quad-tree tiles, carrying out quad-tree cutting on three-dimensional landscape map data, leading spatial data into a relevant database, and carrying out unified management. By using the method, common vector data, raster data, altitude data and three-dimensional map data are organically integrated and issued into a three-dimensional digital earth prototype, thereby shortening the time of data preprocessing, improving the execution efficiency and providing a new integration method for three-dimensional digital earth fundamental geographic data dissemination.

The invention discloses a method for constructing a full-space three-dimensional digital earth model. The method includes that an ellipsoid earth space mathematical model is constructed based on a center of gravity control system (CGCS) 2000 China geodetic coordinate system; an earth surface dissection network is generated based on a fictitious graticule; an earth surface digital elevation model is generated in an insertion mode; a geometric structure module of earth space inner and outer ring layers is fitted by interpolations; a three-dimensional body element mesh of the earth space inner and outer ring layers is generated based in geological cells; an attribute element three-dimensional distribution model of the earth space inner and outer ring layers is fitted by the interpolations; a geographical coordinate is converted into a geocentric space three-dimensional rectangular coordinate; an earth space model multi-scale expression mechanism based on level of detail (LOD) is constructed; three-dimensional visualization is performed; earth space positions are checked; and three-dimensional analysis is performed. According to the method, the automaticity and the adaptability are high, and an earth space solid model containing the inner and outer ring layers can be rapidly and automatically reconstructed in three-dimensional space to be displayed on a computer display screen in a three-dimensional visualization mode to support space analysis of various professionals.

The invention provides an electric power typhoon disaster resistance simulation analysis early warning system based on the three-dimensional digital Earth. The system comprises an information display module, a geographical data service module, an electric power data service module, a meteorological data module and an electric power early warning analysis module. According to the system, the three-dimensional digital Earth is taken as a display carrier, electric power equipment, the meteorological environment and the geographical environment are combined together, so a multi-layer spatial structure of the electric power network is intelligibly displayed, and relationship and influence between the electric power and the geographical environment and between the electric power and the meteorological environment are further displayed; the meteorological environment is established in the three-dimensional environment, simulation leads capable of simulating wind swinging and broken line dropping are constructed in the three-dimensional electric power, typhoon broadcasting data is utilized for electric power early warning and analysis, and correction is carried out according to geographical situations, accuracy is not only improve, but also calculation efficiency is further improved, influence of typhoon exerted on the electric power can be predicted, and powerful support can be provided for electric power typhoon disaster resistance.

The invention discloses a graphic animation design system based on three-dimensional digital earth and a design method thereof. The system includes: a three-dimensional digital earth module, which provides capabilities of three-dimensional earth simulation and geographic information data management, display and analysis , and is a display platform of the entire system; an animation data management module, which manages data including graphic data and various types of script data, and is data support in an animation design process; a visual editing tool module, which includes an entity library manager, a frame editor and a flowchart editor, and is a human-machine interaction platform of the system; and an algorithm logic module, which provides underlying algorithm support, and is a technical basis of the system and an association link of all the parts of the modules. The system uses the three-dimensional digital earth as a display basis, adapts to various spatial scales, can realize rapid construction and modification of a three-dimensional animation scene in a local scene or a global range, and provides a rehearsal deployment platform for the fields of military exercises and the like.

The invention discloses a rapid three-dimensional ground object model construction method. The method comprises the following steps of 1, acquiring a longitude and a latitude, and height data of a ground object and constructing a three-dimensional ground object framework model; 2, extracting geographic grid data and image data of the ground object from a three-dimensional digital earth model; 3, generating a ground-object top-surface-texture two-dimensional image picture; and 4, carrying out texture covering on a three-dimensional ground-object model top surface. In the invention, a stereoscopic three-dimensional model can be rapidly constructed through a ground surface image in a three-dimensional scene.

The invention discloses a construction method for a 3D dynamic visual simulation platform for multimode navigation. The method comprises the following specific steps: a human-computer interaction platform is constructed on the basis of MFC (Microsoft foundation classes) in VC++ and OSG 3D rendering engine environment, a 3D digital earth scene and natural environment are rendered with an OSGEarth terrain rendering toolkit, and a 3D model of an airplane and a virtual simulation scene model of an airport are established with 3D modeling software and loaded to the 3D digital earth scene. Key point data of a flight line is acquired, and interpolation way point data is obtained through processing and used for driving flight of the airplane. During flight of the airplane, a rover is used for tracking and observing the airplane, flight data of the airplane is updated by an event processor, and the flight data is displayed in real time. The construction method has the advantages of easiness in secondary development, real timeliness and high efficiency, and increases the real-time efficiency of data display.

The invention discloses a method for stimulating and displaying geological drilling information on a digital earth software platform. The method includes the following steps of standardizing drill data and establishing a database, setting three-dimensional modeling control parameters, generating drilling point positions according to borehole geographical coordinates, generating drilling layered scattered points according to drilling layered information, generating a tubular solid model according to the drilling layered information, constructing huge amounts of drilling model multi-scale expression mechanisms based on LOD, and conducting three-dimensional visualization, inquiry and analysis operations on the digital earth platform. The implementation process of the method is simple and high in automaticity, the generated drilling model is rich in information, high in interaction and good in visualization effect, and distribution, integration and sharing of the generated drilling model can be easily conducted on internet. The method is beneficial to geologists for showing and distributing their drilling information to other researchers, professionals and the public.

The invention relates to the technical field of geographic information, in particular to a digital-earth-oriented data fusion method and device. The digital-earth-oriented data fusion method comprises the following steps that a first data LOD layer and a second data LOD layer of the same level of detail LOD layer are fused, so that a fusion area is obtained; the border of second data is extracted in the fusion area, expansion is conducted based on the border, and a second data buffer area is established; feature points are obtained according to the first preset rule in the second data buffer area, and smooth data in the buffer area are obtained through weighting processing and linear interpolation; according to the second preset rule, geometric border matching is conducted on high-precision and low-precision fusion data blocks which are simplified through border points, so that a border matching data block is obtained; a triangular network is established in the border matching data block according to the third preset rule, and a fusion result is output; the steps are executed in a circulating mode until all LOD layers obtain fusion results. The digital-earth-oriented data fusion method and device solve the problems that local abrupt change occurs and frames are not continuous in the digital earth visualization process.

The invention provides an aerial survey method and system based on real-time dense three-dimensional point cloud of an unmanned aerial vehicle and DSM, and the method comprises the steps: obtaining anoriginal image photographed by a camera in a flight process of the unmanned aerial vehicle, and estimating the camera pose of the original image through the SLAM technology; optimizing the camera pose to obtain an optimal pose; densifying two continuous frames of original images by using the optimal pose to obtain a depth map; filtering the depth map to obtain a three-dimensional point cloud; generating a DOM model, a DEM model and a DSM model by using the three-dimensional point cloud; performing multi-band fusion on the DOM model, the DEM model and the DSM model to obtain a global DEM model, a global DOM model and a global DSM model; and generating a flight map according to the global DSM model; according to the method, the dense three-dimensional point cloud, the digital orthographic image map and the digital earth surface model can be quickly generated from the aerial images of the unmanned aerial vehicle, so that the flight map is generated while the unmanned aerial vehicle flies.

The invention relates to a terrestrial space scene simulation method and system based on a mobile platform and belongs to the technical field of three-dimensional space visualization. According to the method, a mobile platform client is utilized to change viewpoint positions, a visual range can be calculated out according to the viewpoint positions, a node needing to be rendered and a subdivision degree in a current viewpoint position posture are determined, and a new rendered node structure is established; a node list needing to load data is generated according to a new generated scene rendered node structure, a data request is sent according to the node list needing to load data, and the required data are loaded to the mobile platform client; the loaded imaged and the loaded DEM data are separately compiled into texture and vertex buffer objects on the mobile platform client, the texture and the vertex buffer objects are drawn and displayed through three-dimensional drawing software, and the simulation of the three-dimensional digital earth on the mobile platform client is achieved. The method achieves the space environment visualization on the mobile platform client and is satisfied in visualization effect and good in user experience.

The present invention relates to a VIVE virtual earth roaming browse method based on an OsgEarth. The method comprises the steps of: Based on an OsgEarth digital earth platform, constructing a three-dimensional geographic information scene; based on the OpenVR, constructing a plugin suitable for an OsgEarth digital earth platform; employing the plugin suitable for the OsgEarth digital earth platform, performing arrangement and connection of an HTC VIVE hardware device; and employing a camera controller with a first-person perspective and employing the HTC VIVE to perform roam control on the OsgEarth digital earth. Through combination of the OpenVR technology and the OsgEarth technology, the link of the HTC VIVE hardware device and the OsgEarth software platform is constructed, and the OsgEarth digital earth platform VR roam first-person perspective camera controller is constructed through the coordinate transformation relation among the real space, the virtual space, the projection space and the device space so as to achieve the global VR roam browse control function, and the VIVE virtual earth roaming browse method based on an OsgEarth is vivid in effect, high in sense of realityand convenient to operate and use, and can be widely applied to the geographic information application field.

The invention discloses a catchment area dividing method based on a triangle patch, which comprises: 1) a confluence path extracting method based on a plane-point-side-point confluence mode that water of the triangle patch converges at the lowest point and then converges at the maximum side along slope; 2) a dividing method for marking a first-level catchment area of an upstream triangle based on the plane-point-side-point confluence mode; and 3) a multi-level catchment area dividing method for filling low-lying vertex in the catchment area based on the elevation of a catchment area water outlet. The catchment area dividing method based on the triangle patch can be applied to basin characteristic analysis of confluence path extraction, catchment area (multi-level) division and water outlet judgment of digital earth surface (comprising complex earth surface based on CD-triangulated irregular network (CD-TIN)) represented by the TIN, provides a new method for TIN-based digital elevation model (DEM) basin characteristic analysis, and can develop the corresponding software for the digital hydrological field (applied to urban waterlogging flood process simulation and simulated analysis).

The invention discloses an overseas park investment attracting service system based on digital earth framework. The system comprises a fundamental geospatial information service platform, an information collecting layer, a data processing layer, a data analysis layer, an application layer, and a digital earth multi-dimensional visual representation platform. The system is used for park informationomnibearing visual representation for an enterprise party in a global three-dimensional geographic information digital earth, to form multi-dimensional, perceivable, and measurable investment environment perception. The system can effectively realize seamless joint of a park and enterprises, capital and projects, and products and market.

The invention relates to a single-spindle cradle head device for an aerial photography unmanned plane, which belongs to the technology of a single-spindle course deviation-rectifying mechanical cradle head which can be automatically controlled. The single-spindle cradle head has the structure that a barrel is installed on a motherboard, a gearwheel is fixed in the mounting groove of the barrel, and a box is fixed on the barrel; a pinion is connected to a coupling shaft after being meshed with the gearwheel, and a servo is installed on the shore and the coupling shaft of a bedplate. The single-spindle cradle head device ensures that the unmanned plane carries out real-time course deviation rectification and mechanical shock adsorption for cameras in the operation process, picture images are clear, and picture forming rate is high. Meanwhile, the invention has scientific and reasonable structural design, low cost, low noise and energy saving, is safe, efficient, small, portable, efficient and mobile, can be widely applied for monitoring and detecting in various fields of public security, national defense industry, the digital earth and the like, has wide market demands and is easy to popularize and apply.

The invention relates to a cloud service-based partial discharge transient-stage earth electric wave cloud detection method and device, wherein the method comprises the steps of: acquiring an earth electric wave signal; conducting filtering, amplification, analog-to-digital conversion to the acquired earth electric wave, wherein the analog-to-digital conversion consists of the steps of: rectifying a preset square wave signal into a direct current signal, comparing the direct current signal with the amplified earth electric wave, and reading the amplified earth electric wave by applying a binarization reading method; sending the digital earth electric wave to a cloud service side, conducting data processing to the digital earth electric wave through the cloud service side, and judging whether partial discharge occurs; and receiving the processed data returned by the cloud service side and a judgment result, displaying the processed data, and prompting according to the judgment result. The invention provides a detector accordingly. The method and device can overcome the defects that the on-site background noise is greatly influenced, and the data processing is complicated through the existing TEV partial discharge inspection, and improve the computation speed of the device and detection accuracy on partial discharge.

The invention discloses a water pollution emergency analysis system based on digital earth, which mainly comprises a data integration module, a water pollution event simulation module, a water pollution event emergency analysis module and a water pollution information visualization module. The data integration module is connected with the water pollution event simulation module, the water pollution emergency analysis module and the water pollution information visualization module. The present invention can determine multi-source data fusion, water pollution incident problem analysis, water pollution incident knowledge application, component combination between parameters required for water pollution incident emergency analysis, and form practical data integration, water pollution emergencyanalysis, and water conservancy information visualization according to actual requirements. The emergency analysis system of the invention solves the problems that the data in the existing water pollution emergency analysis is difficult to be effectively integrated, the simulation effect is not ideal and the emergency analysis result is inaccurate, thereby scientifically providing decision support for responding to the water pollution emergency.

The invention relates to a 3D stereoscopic fire identification method and system. The method comprises the following steps: 1) constructing a virtual digital earth by using a virtual reality technology, and loading a three-dimensional scene in the virtual digital earth; 2) mapping the real-time image of the surveillance video into the three-dimensional space scene to realize the fusion of the surveillance video and the three-dimensional scene; 3) carrying out fire diagnosis analysis on the monitoring video in the three-dimensional scene, so as to find the fire and give an alarm. Specifically,step 3) adopts the semantic partition and semantic fusion method based on CNN features to diagnose and analyze the fire. The invention provides a video multi-point fusion system which can be seen more, understood more and viewed widely for users, and can carry out fire analysis and alarm on the content in the video, thereby realizing real-time command of emergency facilities such as evacuation andevacuation of personnel, and realizing visual remote emergency command.

This invention relates to an output voltage compensation device and a method used in analog source drive, in which, the device includes a voltage addition device, a difference comparator and a filter, first of all, the filter receives a reference level to filter it and outputs it to the difference comparator, then the comparator outputs the difference voltage comparing the analog earth level of the analog source drive and the reference level to the voltage addition device, which compensates the output voltage of the analog source drive with the difference voltage, and the reference level received by the filter is the digital earth level of the drive.

The invention provides a modeling system and method for a triangular irregular network pyramid of a global geographic framework. The modeling system for the triangular irregular network pyramid of the global geographic framework further comprises a data importing module, a data management module, a data interaction module, an intelligent pyramid modeling module and a data output module; a three-dimensional digital earth platform further comprises a remote server data reading module, a three-dimensional digital earth platform client data dynamic loading module, and a three-dimensional digital earth platform client data browsing and visual analysis module. Compared with a pyramid DEM block model with a corresponding precision level, a pyramid TIN (Triangular Irregular Network) block model having the corresponding precision level and built based on an adaptive principle of three-dimensional irregular curved surface features has the advantages that geometric shape feature information of the pyramid TIN block model is basically kept constant but the data amount is greatly reduced.

The invention discloses a method and device for generating a digital surface model, and the method comprises the steps: forming a plurality of groups of stereo image pairs through three or more than three images with the resolution of 2-6m, at least one image being a different-orbit image obtained by a high-resolution stereo surveying and mapping satellite; generating multi-view point cloud data according to the plurality of groups of stereo image pairs; fusing the multi-view point cloud data, and extracting building optical point cloud data; determining the actual height of the building by utilizing the building height extracted from the building optical point cloud data and a small amount of laser radar data; and fusing the point cloud and the building height by utilizing the stereopairto generate an urban digital surface model. The digital earth surface model generated by the method does not need a high-resolution image with the resolution less than or equal to 1m; and the actual height of the building is determined by utilizing the building height extracted from the building optical point cloud data and the laser radar data, and the precision of the height of the digital surface model is improved, so that the accuracy of the digital surface model is improved.

The invention provides a near-field radiation attenuation test method and device. The method comprises steps of using a unique geographic large-scale scene three-dimensional visualization technology of a three-dimensional geographic information system; fusing a satellite image base map and elevation model data; establishing a virtual digital earth display platform; meanwhile, configuring a three-dimensional visualization scheme of an electric wave propagation radiation attenuation calculation result; on a virtual digital earth platform, carrying out three-dimensional visual display through geographic position mapping in a vivid, attractive, easy-to-distinguish, easy-to-read and measurable mode, integrating nationwide elevation model data and surface coverage data, and using an efficient data query engine for providing data support for radio wave propagation radiation attenuation calculation; various data calling interfaces are unified, standardized access of an external radiation attenuation scientific calculation module is realized, and a unified radio wave transmission radiation attenuation calculation platform is established.

The invention discloses an airport earthwork calculation method based on a digital earth. The airport earthwork calculation method comprises a coordinate system conversion step S110, an original terrain digital model establishment step S120, a slope generation step S130, a surface digital ground model design generation step S140 and an earthwork amount calculation step S150. According to the invention, an online elevation and an image are used; the method can be established on an open source data earth platform OsgEarth. By digitalizing an airport area defined by a user and generating a side slope according to the boundary of the design area, the earthwork amount calculation is carried out on the whole design area and an original terrain surface, so that the earthwork amount evaluation inthe airport site selection process can be conveniently and rapidly carried out, a proper site can be initially selected, and the overall design efficiency is improved.

The invention discloses a method for simulating and displaying a global crustal structure on a digital earth software platform, which comprises the following steps: deriving spatial information and attribute information of a crustal grid unit from a CRUST 1.0 global crustal model; generating a crustal grid unit top surface model; generating a three-dimensional solid model of a geophysical layer in the crust; establishing a global crustal model multi-dimension expression mechanism based on a level-of-detail (LOD) model; and performing model displaying and three-dimensional analysis on the digital earth software platform. The method of the invention has advantages of simple realizing process and high automatic degree. The generated global crustal model has advantages of abundant information, high interactive performance, high visual effect, and easy distribution, easy integration and easy sharing on the national Internet. The method for simulating and displaying the global crustal structure facilitates high-efficiency expression and communication of internal morphological structure and material composition by a geoscientist to other scientific research personnel, professional technical personnel and social public. Furthermore the method of the invention lays a basis for deeper geosciences education and scientific research.

The invention discloses a method for dynamically generating fine coast topography on a three-dimensional digital earth, and relates to the field of earth dynamic generation of fine coast topography. The method comprises the following steps: S1, acquiring and preprocessing data; S2, performing coastline data extraction processing; S3, generating coastal topographic grid data; and S4, generating coastal detail texture data. The method is based on the existing terrain generation technology; UTILIZING SATELLITE PICTURE DATA, ground elevation data and coastline vector data; By combining an innovative coastline high-precision topographic grid generation algorithm and an innovative detail texture generation algorithm, high-precision coastline, coastline topographic grids and coastline detail textures are obtained, three-dimensional digital earth coastline topography with the generation precision and effect closer to those of a real environment is generated, and the method can be widely applied to the fields of geographic information systems, simulation and the like.