Three‐dimensional terrain modeling with multiple‐source illumination

2019 ◽  
Vol 23 (5) ◽  
pp. 937-959 ◽  
Author(s):  
I. V. Florinsky ◽  
S. V. Filippov
Keyword(s):  
Three Dimensional ◽  
Multiple Source ◽  
Terrain Modeling ◽  
Source Illumination

Preliminary Study on Voxel-Based Virtual Geographic Environment Representation

2013 ◽  
Vol 307 ◽  
pp. 464-469
Author(s):  
Bing Chuan Jiang ◽  
Xiong You ◽  
Qing Xia ◽  
Wei Zhang
Keyword(s):  
Process Analysis ◽  
Three Dimensional ◽  
Spatial Process ◽  
Surface Model ◽  
Terrain Modeling ◽  
Virtual Geographic Environment ◽  
Natural Phenomena Simulation ◽  
Geographic Environment ◽  
Environment Representation ◽  
Geographic Process

The expression of virtual geographic environment is based on the surface modeling, such as three-dimensional terrain modeling and rendering most of which are based on the polygon grid and 2D textured. In the expression of extreme terrain, such as caves, cliffs, canyons it seems powerless. However, the voxel-based terrain modeling has been more useful than polygon modeling expression in the field of real-time terrain deformation, extreme terrain simulation and geographic process expression. Furthermore, virtual geographic environment based on the traditional surface model is difficult to realistically simulate the real world which is volumetric. This paper analyzes the trends of the geographical environment representation, and discusses the typical voxel-based applications in natural phenomena simulation, terrain modeling and spatial process analysis. It provides the references for the integrative representation of the unified voxel and surface model, and for the construction of virtual geographic environment unified platform.

The Application of Three-Dimensional Terrain Modeling Based on GeoTIFF Supported by Creator

2014 ◽  
Vol 687-691 ◽  
pp. 4101-4104
Author(s):  
Xi Zhe Peng
Keyword(s):  
Three Dimensional ◽  
Simulation System ◽  
Visual Simulation ◽  
Large Area ◽  
Terrain Modeling ◽  
Key Technology ◽  
The Real ◽  
Modeling Technology ◽  
Terrain Models

Large area real terrain modeling is the key technology in visual simulation system. This thesis discusses the terrain modeling technology based on the GeoTIFF data, which transform the GeoTIFF data to DEM using the Global Mapper. And then, the three dimensional terrain models are established through Creator environment, the real terrain modeling is implemented quickly.

A Simple Three-Dimensional Terrain Modeling Method for Complex Terrain Wind Environment Simulation

2013 ◽  
Vol 397-400 ◽  
pp. 2420-2425
Author(s):  
Shi Ling Chen ◽  
Jun Lu ◽  
Wei Wei Yu ◽  
Shao Liang Zhang
Keyword(s):  
Complex Terrain ◽  
Cfd Simulation ◽  
Surface Wind ◽  
Three Dimensional ◽  
Modeling Method ◽  
Terrain Modeling ◽  
Wind Environment ◽  
Near Surface ◽  
Digital Modeling ◽  
Environment Simulation

In order to solve the problems in complex terrain modeling by computational fluid dynamics(CFD) simulation at prophase, such as difficulty in collecting data, tedious modeling process, wasting times and so on. In this paper, combined various commonly digital technology，and the transformation between the network terrain file and CFD (PHOENICS) solid model is realized by using a new set of outdoor complex terrain rapid digital modeling method. Take mountain city -Chongqing as an object to analyses the near-surface wind environment. The method is directly generated by the network terrain data without any screening or simplified. The virtual model can be matched the actual terrain with the extreme. By using the simulation cycle for complex terrain, time will be greatly shortened for urban planning.

Conversion of a GIS surface data directly to a 3D STL part for terrain modeling

2014 ◽  
Vol 20 (5) ◽  
pp. 422-430 ◽  
Author(s):  
Sanat Agrawal ◽  
Deon J. de Beer ◽  
Yashwant Kumar Modi
Keyword(s):  
Three Dimensional ◽  
Solid Model ◽  
Catchment Management ◽  
Data Loss ◽  
Terrain Modeling ◽  
Content Type ◽  
Terrain Models ◽  
File Formats ◽  
Surface Data ◽  
3D Solid

Purpose – This paper aims to convert surface data directly to a three-dimensional (3D) stereolithography (STL) part. The Geographic Information Systems (GIS) data available for a terrain are the data of its surface. It doesn’t have information for a solid model. The data need to be converted into a three-dimensional (3D) solid model for making physical models by additive manufacturing (AM). Design/methodology/approach – A methodology has been developed to make the wall and base of the part and tessellates the part with triangles. A program has been written which gives output of the part in STL file format. The elevation data are interpolated and any singularity present is removed. Extensive search techniques are used. Findings – AM technologies are increasingly being used for terrain modeling. However, there is not enough work done to convert the surface data into 3D solid model. The present work aids in this area. Practical implications – The methodology removes data loss associated with intermediate file formats. Terrain models can be created in less time and less cost. Intricate geometries of terrain can be created with ease and great accuracy. Social implications – The terrain models can be used for GIS education, educating the community for catchment management, conservation management, etc. Originality/value – The work allows direct and automated conversion of GIS surface data into a 3D STL part. It removes intermediate steps and any data loss associated with intermediate file formats.

A Localization Algorithm of Multi-Hop Three Dimensional AOA with Space-Based Angle Transmission and its Application

2013 ◽  
Vol 756-759 ◽  
pp. 3562-3567
Author(s):  
Qing Zhang Chen ◽  
Yun Feng Ni ◽  
Xing Hua Li ◽  
Rong Jie Wu ◽  
Yan Jing Lei ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Localization Algorithm ◽  
Angle Of Arrival ◽  
Terrain Modeling ◽  
Terrain Model ◽  
Anchor Nodes ◽  
Slow Progress ◽  
Positioning Algorithm

Wireless sensor node's localization is a funda-mental technology in Wireless Sensor Networks. There are only quite a few study on three-dimensional (3D) localization which is suffered in slow progress, actually, is one of the main difficulties in WSN localization. Based on the study of the existing two-dimensional positioning algorithm and the application of terrain modeling, localization algorithm for sensor nodes in (3D) condition has been focus on as well as the application of terrain model. Using the idea proposed by representative algorithm--APS multi-hop AOA (Angle of Arrival), this paper proposed a new algorithm named Multi-hop Three Dimensional AOA With Space-based Angle Trans-mission (MSAT3D AOA). Using this technology, target nodes can use information of anchor nodes which are more than one hop away form. This paper also combined MSAT3D AOA algorithm with Delaunay triangulation algorithm for terrain modeling.

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