208 results about "Topographic model" patented technology

The disclosed terrain model is a generative, probabilistic approach to modeling terrain that exploits the 3D spatial structure inherent in outdoor domains and an array of noisy but abundant sensor data to simultaneously estimate ground height, vegetation height and classify obstacles and other areas of interest, even in dense non-penetrable vegetation. Joint inference of ground height, class height and class identity over the whole model results in more accurate estimation of each quantity. Vertical spatial constraints are imposed on voxels within a column via a hidden semi-Markov model. Horizontal spatial constraints are enforced on neighboring columns of voxels via two interacting Markov random fields and a latent variable. Because of the rules governing abstracts, this abstract should not be used to construe the claims.

The invention provides a three-dimensional terrain model real-time smooth drawing method with combination of a GPU technology, and belongs to the technical field of image processing. The objective of the invention is to provide the three-dimensional terrain model real-time smooth drawing method with combination of the GPU technology so that cache reuse in multiple times of drawing can be realized based on the current popular programmable GPU technology with a global digital elevation model acting as a data source, and load of computation space is effectively reduced. The method comprises the steps of construction of a multi-resolution pyramid model, elimination of image noise points, filtering of images, partitioning of planar projection of the earth according to equal latitude and longitude, and construction of different hierarchical levels of pyramid layers according to a mode from the top to the bottom. Acceleration and enhancement of terrain rendering are realized based on the programmable GPU technology, i.e. all phases of a graphical drawing pipeline are controlled by using shader languages, two and textures are respectively generated by vertex information and index information of elevation data to be stored in video memory for scheduling of whole terrain drawing; and vertex interpolation and migration are performed in the geometric phase by utilizing a curved surface subdivision and fractal technology so that procedural details are generated and the phenomenon of edges and corners of the terrain mesh when resolution is insufficient can be compensated.

A hidden model determinator that compares a coordinate value in a depth direction which is acquired by performing a coordinate transformation on each of a first determination target point and a second determination target point which are selected from model data about a facility model with that in the depth direction of model data about a topographical model, which is stored in a Z value buffer, to determine whether or not the facility model is hidden behind the topographical model, and a facility addition processing unit that stores model data about a facility model which the hidden model determinator determines is not hidden behind the topographical model.

The invention discloses an underwater terrain matching aided inertial navigation positioning method and a positioning system. The method mainly comprises the following steps: (1) compensating an error for a closed loop through optimal estimation of Kalman filtering and compensating an error for an open loop through speed backtracing; (2) building an accurate three-dimensional ray tracing model taking an attitude angle of an underwater vehicle into consideration, and providing a method for extracting a sampling point in a beam footprint; (3) providing a method for establishing an underwater digital terrain model according to a water depth constraint and a Delauney triangulation network of a fractal dimension theory; (4) providing an underwater terrain adaption area evaluation method according to a gray decision theory; (5) providing the underwater terrain matching aided navigation method according to the self-adaptive gauss and the filtering. The error compensation methods for the closed loop and the open loop are utilized, the accumulative error of an inertial navigation system is greatly weakened, and the navigation positioning accuracy of the underwater vehicle is greatly improved by constructing the high-accuracy high-resolution underwater digital terrain model and the self-adaptive gauss and filtering algorithms.

The invention provides a three-dimensional terrain and radar terrain generating method based on S-57 electronic chart data. The three-dimensional terrain and radar terrain generating method comprises the steps that firstly, an elevation vector graph based on an electronic chart is generated based on the S-57 electronic chart data and through the combination of GDEM data, and the elevation vector graph serves as an uniform data source; secondly, the elevation vector graph undergoes conversion, simplification and texture mapping to generate a scene three-dimensional terrain model; at last, based on the elevation vector graph and through cutting of the data, radar terrain data generation and water depth data and navigation target data extraction are respectively completed at different sampling intervals according to needs. The three-dimensional terrain and radar terrain generating method based on the S-57 electronic chart data overcomes the defects that an existing terrain model is not uniform in data matching, not high in precision and poor in running efficiency; the three-dimensional terrain data generating technology, the GPS positioning technology and the GIS geological information technology are integrated, so that the three-dimensional scene running efficiency and the three-dimensional scene vividness are guaranteed, and meanwhile, accurate matching between scene three-dimensional terrain data, radar terrain data, water depth data and navigation target data and the electronic chart is realized.

This description provides an autonomous or semi-autonomous excavation vehicle that is capable of navigating through a dig site and carrying an excavation routine using a system of sensors physically mounted to the excavation vehicle. The sensors collect one or more of spatial, imaging, measurement, and location data representing the status of the excavation vehicle and its surrounding environment. Based on the collected data, the excavation vehicle executes instructions to carry out an excavation routine by filling earth into a hole within the site and compacting the earth. The excavation vehicle is also able to carry out numerous other tasks, such as checking the volume of excavated earth in an excavation tool, and helping prepare a digital terrain model of the site as part of a process for creating the excavation routine.

A terrain modeling method that fuses geometric characteristics and mechanical characteristics, and a terrain modeling system are provided in the present invention. The method includes steps of: obtaining color images and depth images of the detected region, performing a terrain semantic segmentation on the color images, and fusing ground semantic information obtained by the semantic segmentation and depth information contained in the depth images at the same time to generate the point clouds; mapping the point clouds to a raster map in a map coordinate system to generate corresponding rasters, and updating the elevation values to the corresponding rasters; and calculating the input images in terms of terra-mechanical characteristics, and updating calculation results to the corresponding rasters to generate a terrain model. A mechanical characteristic parameter is added to a terrain factor, and terrain characteristics are innovatively performed from two dimensions of geometric characteristic and mechanical characteristics.

The invention relates to the field of geological disaster risk evaluation, in particular to a landslide disaster prediction method and device. The method comprises the steps: firstly building a digital terrain model, dividing a research region into grids, enabling each grid to serve as a unit, and endowing each unit with needed geological and rainfall distribution information; performing infiltration analysis to obtain pore water pressure; based on the pore water pressure, calculating the safety coefficient by using an infinite slope model, and solving the instability probability to judge theslope stability and reliability; collecting a large amount of historical landslide data, and obtaining an empirical relationship for calculating a landslide movement distance average value through regression analysis; at least one side or one corner of each unstable unit is connected to form a group, wherein one group is regarded as a landslide, the position and the volume of the landslide are determined, the landslide movement distance relation serves as a landslide movement rest condition, the movement track and the accumulation position of the landslide body are evaluated, then the landslide influence range is predicted, and a scientific basis is provided for post-disaster reconstruction and disaster early warning work.

The invention provides a method for constructing a multi-level three-dimensional terrain model through multi-source data fusion. The method sequentially comprises the steps of image control point measurement and setting, unmanned aerial vehicle flight and data processing, three-dimensional laser scanning data acquisition and processing, terrain design and satellite terrain processing, multi-sourceimage data fusion, multi-source point cloud data fusion and multi-source DEM fusion. Finally, a three-dimensional terrain model is constructed, a single-source DOM + single-source DEM fusion mode, amulti-DOM + single-source DEM fusion mode and a multi-DOM + multi-DEM fusion mode are established, and a multi-level and multi-precision three-dimensional real terrain model is constructed. The problems that an existing three-dimensional terrain model is low in precision, single in obtaining mode, poor in expression effect, poor in construction guidance and the like are solved. The invention belongs to the field of constructional engineering.

This description provides an autonomous or semi-autonomous excavation vehicle that is capable of navigating through a dig site and carrying an excavation routine using a system of sensors physically mounted to the excavation vehicle. The sensors collect one or more of spatial, imaging, measurement, and location data representing the status of the excavation vehicle and its surrounding environment. Based on the collected data, the excavation vehicle executes instructions to perform an excavation routine by excavating earth from a hole using an excavation tool positioned at a single location within the site. The excavation vehicle is also able to carry out numerous other tasks, such as checking the volume of excavated earth in an excavation tool, navigating the excavation vehicle over a distance while continuously excavating earth from a below surface depth, and preparing a digital terrain model of the site as part of a process for creating the excavation routine.

The invention discloses an urban inland inundation prediction method and system based on an inland inundation rapid simulation coupling model. The method comprises the steps: collecting pipe network data and hydrological data of a research area; constructing a two-dimensional terrain model, and performing building area elevation processing and road distribution area elevation processing on the two-dimensional terrain model; building a two-dimensional hydrodynamic model based on the processed two-dimensional terrain model; respectively constructing a hydrodynamic model of the pipe network and ahydrological model of the pipe network, and connecting the two models to obtain a drainage pipe network model; and coupling the two-dimensional hydrodynamic model with the drainage pipe network modelto obtain an urban inland inundation simulation coupling model, and predicting urban inland inundation water accumulation point distribution and water accumulation depth through the urban inland inundation rapid simulation coupling model. The method has the characteristics of simplicity in operation, high numerical simulation speed, small required data volume and relatively high precision, and can be applied to emergency urban inland inundation rapid simulation.

The invention discloses a visualized landslide simulation method for fast generating a real landform model, simulating a real landform environment and, on the basis of that, performing Boolean operation and rigid body breaking. The visualized landslide simulation method comprises steps of importing a landform elevation grey-scale map into a Blender to obtain a landform model grids and performing adjustment on the grids, automatically synthesizing a texture image to draw UV maps for a landform curve surface to simulate different landforms, (2) designing a fragment generation pipeline, wherein the fragment generation pipeline designing comprises steps of using a landslide body obtained through the Boolean operation based on a Sutherland-Hodgman algorithm to transform the collided rigid body into a point cloud on a fundamental basis, performing triangularization on the point cloud to obtain a Thiessen polygon and generating a Voronoi cells to simulate landside fragments, and (3) fitting the landform data to generate fragment interactive blocking surfaces, performing a combination operation with the fragments and generating a successive frame animation.

The invention belongs to the technical field of modeling, and discloses an interpolation method for generating a complex terrain grid model based on GIS data. The method comprises the following steps:1) selecting a research terrain region, acquiring terrain data under geodetic coordinates from a GIS (Geographical Information System), processing and performing format conversion for the acquired terrain data through ArcMap, and exporting a txt file which can be directly called and is in the form of an x, y and z three-dimensional coordinate; 2) through inputting characteristic parameters, building a three-dimensional flat terrain model through parameterization and automatically dividing grids; 3) realizing extraction of actual terrain data of the research region through a program, obtainingan elevation value of a corresponding flat terrain grid node through performing interpolation according to an actual terrain elevation value, and realizing generation of actual terrain grids. The actual terrain grids obtained by the method provided by the invention is highly accurate and high-quality; a high-simulation terrain model is provided for numerical simulation of the complex terrain; theinterpolation method is very simple, and calculation efficiency is improved remarkably.

The embodiment of the invention provides a three-dimensional geographic scene model construction method and device based on a stereoscopic remote sensing image. The method comprises the following steps: carrying out image preprocessing on an original satellite remote sensing image, and acquiring a digital elevation model image and a digital orthoimage; conducting slicing according to a preset image slicing rule to obtain a digital elevation model image tile and a digital orthoimage tile; establishing a three-dimensional terrain model by using a triangulated irregular network construction technology, and mapping landform texture to the three-dimensional terrain model based on a texture coordinate mapping technology to obtain a partitioned three-dimensional geographic scene model; and finally, storing the partitioned three-dimensional geographic scene model according to tile row and column numbers to obtain a three-dimensional geographic scene model corresponding to the original three-dimensional satellite remote sensing image. Compared with a traditional modeling method, the technical scheme of the invention has the advantages of large modeling scale, high efficiency and high automation degree, and greatly improves the model construction efficiency and the like while ensuring modeling precision and the sense of reality.

Methods and apparatus are provided for analysis of 3-dimensional images of an optic nerve head surface topography. Topographic images of the optic nerve head may be analysed to define a topographic model fitted to the topographic image of the optic nerve head about a centre of analysis. The topographic model is defined using model morphological parameters, and the morphological parameters. In some embodiments, the morphological parameters may be used to detect nerve fibre damage or pathology, such as in the diagnosis of glaucoma.

The invention discloses a method and a system for improving calculation accuracy of photosynthetically active radiation (PAR). The method comprises the following steps of: introducing a terrain influence factor of a digital terrain model, and calculating solar downlink monochromatic light radiation intensity under the condition of a complex terrain, namely I lambda=I dir+ I dif+ I adj, wherein lambda is the wavelength in vacuum; calculating instantaneous PAR under the condition of the complex terrain according to the solar downlink monochromatic light radiation intensity I lambda under the condition of the complex terrain; and expanding into a PAR day value PARd according to the instantaneous PAR.

The invention provides a booster station site selection system based on automatic route selection of an in-plant road of a wind power plant. The system comprises (1) a data collector used for collecting complete three-dimensional topographic data of a geographic scene of the in-plant road of the wind power plant; (2) a digital topographic model generator used for establishing a three-dimensional plant model of the wind power plant; (3) a construction quantity calculator used for calculating the construction quantity of a booster station; (4) a route planner used for adaptively generating a booster station construction route design scheme by integrating the three parameters of a shortest distance, an optimal gradient and minimum booster station construction road cut-fill; (5) a booster station position calculator used for calculating an average shortest distance reaching all fan positions on the basis of obtaining a shortest booster station construction road design scheme and adopting aminimum average distance algorithm to determine an optimal site of the booster station; and (6) a displayer and an interface used for displaying a two-dimensional construction drawing of the boosterstation of the wind power plant and exporting the two-dimensional construction drawing. The invention furthermore discloses a corresponding site selection method.

The invention discloses a method for constructing a three-dimensional terrain scene model of a road. The method comprises the following steps: 1) obtaining terrain data along the road, a tunnel, a bridge culvert, a roadbed engineering design drawing and a remote sensing image drawing through existing technical data; 2) mining required data from the acquired data; performing geometric correction onthe obtained remote sensing image map; (3) according to the processed data, constructing a high-precision original terrain curved surface, road section cross section assembling and manufacturing anda road curved surface in sequence by combining a Civil 3D technology; the road curved surface and the original terrain curved surface being subjected to superposition processing, completing filling and excavation processing of the original curved surface, merging the processed original curved surface into 3ds Max, and processing a tunnel and a bridge culvert according to an engineering design drawing and the original curved surface to obtain a digital terrain model; and 4) superposing the remote sensing image map and the digital terrain model to establish an integral terrain scene model. According to the method, the problems of high cost and low precision of an existing terrain model are solved.

The invention discloses a complex terrain wind field simulation method and device based on WRF and Fluent coupling. Coarse resolution wind field data of a CFD three-dimensional complex terrain model is simulated through a WRF (Weather Research and Forecasting Model), a WRF wind field mesh model is established, wind field data calculated by the WRF wind field mesh model is processed, and a distancereciprocal weighting method or a three-point coplanar linear interpolation method is used to interpolate to obtain five boundary surface wind field data of the CFD three-dimensional complex terrain model. Compared with a calculation method of curve fitting, the complex terrain wind field simulation method and device are simpler and more direct, avoid large deviation of the curve fitting when thewind speed fluctuates greatly, and solve the technical problem of low accuracy of the existing complex terrain wind field simulation method.

The invention discloses an excavator construction guiding system which comprises an excavator body, a movable arm, a bucket rod and a bucket. The excavator body and / or the movable arm are / is providedwith a positioning module used for measuring pose information of the movable arm, the excavator is provided with a measuring assembly used for measuring the telescopic length of a bucket rod hydraulicoil cylinder and / or a bucket hydraulic oil cylinder, the excavator construction guiding system further comprises a measuring terminal, the measuring terminal is used for receiving measuring information of the positioning module and the measuring assembly, a sensor of the measuring bucket is far away from the severe environment, and the system is easier to maintain. The construction method comprises the following steps: calculating pose information of the movable arm, the bucket rod and the bucket according to the measurement information; establishing a construction site terrain model by utilizing software, and determining the pose of a bucket simulation model according to the pose information of the bucket; and guiding construction according to a plane graph and a section graph, and dynamically simulating the topographic construction excavation condition of the construction site according to the path track of the shovel teeth. By comparing an excavated terrain model with a designed terrain section, the actual excavation condition of the construction site is determined, and the phenomena of over-excavation, under-excavation, missed excavation and repeated excavation are avoided.

The invention belongs to the technical field of coastal and offshore engineering model tests, and provides a coastal geomorphological evolution physical model test method, which comprises a rapid manufacturing device and method of a moving bed model, and three-dimensional high-precision rapid measurement of a large-range test terrain. Compared with the prior art, the method provided by the invention has the advantages that the terrain elevation of the moving bed model is determined by designing the elevation positioning rod and the contour line positioning frame, so that the moving bed model can be quickly and accurately manufactured; through a special treatment mode of combining a pebble cushion layer at the bottom of the moving bed model with geotextile, water is easy to drain, and modelsand loss is prevented; by introducing a revolutionary three-dimensional laser scanning technology in the surveying and mapping field, the measurement precision and the working efficiency of a large-scale test terrain model are greatly improved. The method can be applied to hydrodynamic moving bed model experiments of other types through proper adjustment, and has universal applicability.

The invention provides a road fine design method. A plurality of digital cameras are carried on an unmanned aerial vehicle flight platform at high altitude above a road to generate a centimeter-levelthree-dimensional live-action model of the road; then the digital terrain model is extracted and imported into a BIM design platform for terrain visual analysis, horizontal and longitudinal geometricanalysis, road subgrade and pavement design and scheme comparison and selection, the design accuracy is improved, field survey work is reduced, the advantages of intelligence, high flexibility and visualization are achieved, field environment live-action simulation is achieved, and the safety of the design scheme is ensured; the survey efficiency and precision are improved while the labor intensity is reduced; schemes are quantitatively compared and selected, so that the engineering cost is reduced; three-dimensional visual service is provided for shortcut line decision making, accurate simulation is achieved, disordered phenomena such as disordered digging, disordered filling, disordered building and environment damage are avoided, and the method is green, energy-saving and environmentally friendly; the method can be used for road design, and can also be used for construction process monitoring, accurate calculation of engineering quantity change, potential safety hazard investigationand the like.

The invention provides a method for managing remedied earthwork volume of a polluted site by combining aerial survey of an unmanned aerial vehicle and BIM technology comprising the following steps: using an unmanned aerial vehicle to carry out data information acquisition on a polluted site, exporting unmanned aerial vehicle data, and in three-dimensional modeling data processing software, outputting point and line data with elevation properties, based on the soil color, the vegetation coverage condition and the position of the waste residue and waste material pile, obtaining an approximate region boundary of the polluted site; collecting soil samples on points near the boundary line to acquire a boundary of an accurate polluted site area importing the data into revit software to generate a three-dimensional original terrain model, and establishing a BIM model; and based on the BIM model, obtaining information data such as excavation work amount, excavation boundary, depth and the like of earthwork, and realizing full-process management and control of a polluted site remediation project. The unmanned aerial vehicle is used for obtaining the panorama of the whole polluted site and generating the three-dimensional live-action model, and the three-dimensional live-action model is combined with the BIM model, so that the manual measurement modeling cost is greatly reduced, the timeliness and authenticity of the polluted site repair construction process are improved, and the requirement of three-dimensional visualization progress comparison is met.

The invention discloses a dam break flood demonstration and early warning method based on a BIM technology. The method specifically comprises the steps that firstly, a three-dimensional entity terrainmodel and a building model are established; then dam break development process parameters and dam break flood parameters are calculated, and a three-dimensional simulation model of dam break is established; combining the obtained three-dimensional solid terrain model, the building model, the three-dimensional simulation model of dam burst and the particle fluid system are combined to realize realsimulation of the dam burst process and flood routing; and finally performing animation production and rendering are performed on the simulation process to obtain a three-dimensional real dam break flood routing animation. The invention further discloses a demonstration early warning platform based on the method. According to the method, the dam break process and the flood inundation range of thedam can be simulated, and resident evacuation and important building inundation conditions during dam break can be visually known through animations. Risk analysis and technical evaluation data are provided for water conservancy project construction, design and construction units for obtaining the flood inundation process after analogue simulation dam break.

The invention provides an urban high-precision three-dimensional terrain construction method and system based on LiDAR point cloud data. The urban high-precision three-dimensional terrain constructionmethod comprises the steps of creating a three-dimensional point cloud semantic segmentation classification system and a labeling sample library in an urban scene; establishing a three-dimensional point cloud mixed scale voxel block in an urban scene; realizing feature learning of the three-dimensional point cloud, including for a plurality of divided mixed scales, fusing detail structures of thethree-dimensional point cloud and surrounding surface background information by using a three-dimensional convolutional network with a plurality of shared weights to obtain a mixed scale feature vector of the three-dimensional point cloud; realizing semantic element segmentation of the three-dimensional point cloud, including training a feature learning network and performing reasoning predictionon the three-dimensional point cloud of a to-be-modeled area; realizing surface point interpolation of semantic and geometric symbiotic constraints, and making up holes caused by non-surface points to be filtered; and constructing an urban three-dimensional terrain model. According to the method, the semantic segmentation result precision and the precision degree of the urban three-dimensional terrain are improved, and the application requirements of sponge city construction, urban inland inundation analysis and the like are met.

The invention discloses a high-precision riverway terrain interpolation method, which comprises the following steps of: 1, classifying cross section types of a measured riverway, and determining the number of longitudinal control lines of the measured riverway; 2, superposing a river cross section control line by taking the measured river satellite image as a base map, and drawing a river longitudinal control line; 3, interpolating an elevation value at the intersection point of the cross section line and the longitudinal control line of the river channel according to the elevation data of thecross section of the river channel, and interpolating the longitudinal control line into a three-dimensional curve; 4, converting a riverway cross section control line into a three-dimensional line;and generating basic data of a three-dimensional terrain model together with the interpolated three-dimensional longitudinal control lines, performing triangular mesh subdivision on an interpolation region by adopting a Deluany method, and determining the vertex elevation of a triangular mesh by adopting a two-dimensional linear interpolation method, thereby generating the three-dimensional terrain model. According to the method, the value of the river cross section information is fully mined, and the interpolation precision is improved.