Research on Large Scale Terrain Generation Method Based on Geometry Clipmap Algorithm

2018 ◽  
Author(s):  
Guannan He ◽  
Feng Tian ◽  
Guanglei Meng ◽  
Yan Tian
Keyword(s):  
Large Scale ◽  
Terrain Generation

scholarly journals Large Scale Terrain Generation from Tectonic Uplift and Fluvial Erosion

2016 ◽  
Vol 35 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Guillaume Cordonnier ◽  
Jean Braun ◽  
Marie-Paule Cani ◽  
Bedrich Benes ◽  
Éric Galin ◽  
...  
Keyword(s):  
Large Scale ◽  
Tectonic Uplift ◽  
Fluvial Erosion ◽  
Terrain Generation

Research and realization of large-scale complex terrain generation

2002 ◽  
Author(s):  
Jian-yu Wang ◽  
Xiao-xia Zhong ◽  
Hui-zhong Wu
Keyword(s):  
Complex Terrain ◽  
Large Scale ◽  
Terrain Generation

An Algorithm for Large-Scale Terrain Generation Based on Quadtree

2013 ◽  
Vol 446-447 ◽  
pp. 946-950
Author(s):  
Nai Mei Fan ◽  
Zhi Feng Zhang
Keyword(s):  
Data Storage ◽  
Large Scale ◽  
Model Generation ◽  
Test Results ◽  
Storage Test ◽  
Evaluation Standards ◽  
Terrain Model ◽  
Static Data ◽  
Real Time Visualization ◽  
Terrain Generation

The paper puts forward an algorithm for multi-resolution terrain model generation based on quadtree. This algorithm puts elements as view-dependent and terrain relief into the evaluation standards for level of detail and raises appropriate methods to remove cracks in the course of terrain generation according to the law of node partition and rendering. In drawing terrain, optimized display technologies as frustum culling, backface culling, triangle fan and static data storage. Test results show, this algorithm can realize the real-time visualization of large-scale terrain.

On Real-Time Modeling of 3D Terrain Database

2013 ◽  
Vol 760-762 ◽  
pp. 1884-1887
Author(s):  
Wei Zhang ◽  
Chun Hua Zhang ◽  
Yan Zhang
Keyword(s):  
Large Scale ◽  
Simulation Models ◽  
Database Modeling ◽  
Modeling Methods ◽  
Modeling Process ◽  
3D Terrain ◽  
Time Modeling ◽  
Gis Data ◽  
Environmental Simulations ◽  
Terrain Generation

With the uprising deployment of large-scale environmental simulations, as well as the wide applications of the GIS data in the simulation models, the traditional modeling methods have been difficult to meet the requirements of terrain generation of large areas. In this paper, we study a new terrain database modeling process based on Celerity/TerraVista, which uses the techniques of image compression, block optimization, and level of detail (LOD) , for terrain generation of large areas. Tis new modeling process has been applied in our independently developed simulation system and has achieved good results.

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

Some applications of electron beam microanalysis techniques in VLSI process evaluation

1983 ◽  
Vol 41 ◽  
pp. 160-161
Author(s):  
Simon Thomas
Keyword(s):  
Integrated Circuits ◽  
Process Evaluation ◽  
Large Scale ◽  
Technology Development ◽  
Analytical Techniques ◽  
Successful Implementation ◽  
Analysis Of Failures ◽  
Characterization Of Materials ◽  
Circuits Vlsi

Trends in the technology development of very large scale integrated circuits (VLSI) have been in the direction of higher density of components with smaller dimensions. The scaling down of device dimensions has been not only laterally but also in depth. Such efforts in miniaturization bring with them new developments in materials and processing. Successful implementation of these efforts is, to a large extent, dependent on the proper understanding of the material properties, process technologies and reliability issues, through adequate analytical studies. The analytical instrumentation technology has, fortunately, kept pace with the basic requirements of devices with lateral dimensions in the micron/ submicron range and depths of the order of nonometers. Often, newer analytical techniques have emerged or the more conventional techniques have been adapted to meet the more stringent requirements. As such, a variety of analytical techniques are available today to aid an analyst in the efforts of VLSI process evaluation. Generally such analytical efforts are divided into the characterization of materials, evaluation of processing steps and the analysis of failures.

Sign in / Sign up

Export Citation Format

Share Document