Application of virtual earth in 3D terrain modeling to visual analysis of large-scale geological disasters in mountainous areas

2016 ◽  
Vol 75 (7) ◽  
Author(s):  
Miao Yu ◽  
Yu Huang ◽  
Qiang Xu ◽  
Peng Guo ◽  
Zili Dai
Keyword(s):  
Large Scale ◽  
Visual Analysis ◽  
Mountainous Areas ◽  
Terrain Modeling ◽  
Geological Disasters ◽  
3D Terrain ◽  
Virtual Earth

scholarly journals Modeling Spatiotemporal Population Changes by Integrating DMSP-OLS and NPP-VIIRS Nighttime Light Data in Chongqing, China

2021 ◽  
Vol 13 (2) ◽  
pp. 284
Author(s):  
Dan Lu ◽  
Yahui Wang ◽  
Qingyuan Yang ◽  
Kangchuan Su ◽  
Haozhe Zhang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Relative Error ◽  
Urban Areas ◽  
Large Scale ◽  
Population Distribution ◽  
Spatial Optimization ◽  
Distribution Data ◽  
Mountainous Areas ◽  
Mean Relative Error ◽  
Nighttime Light

The sustained growth of non-farm wages has led to large-scale migration of rural population to cities in China, especially in mountainous areas. It is of great significance to study the spatial and temporal pattern of population migration mentioned above for guiding population spatial optimization and the effective supply of public services in the mountainous areas. Here, we determined the spatiotemporal evolution of population in the Chongqing municipality of China from 2000–2018 by employing multi-period spatial distribution data, including nighttime light (NTL) data from the Defense Meteorological Satellite Program’s Operational Linescan System (DMSP-OLS) and the Suomi National Polar-orbiting Partnership Visible Infrared Imaging Radiometer Suite (NPP-VIIRS). There was a power function relationship between the two datasets at the pixel scale, with a mean relative error of NTL integration of 8.19%, 4.78% less than achieved by a previous study at the provincial scale. The spatial simulations of population distribution achieved a mean relative error of 26.98%, improved the simulation accuracy for mountainous population by nearly 20% and confirmed the feasibility of this method in Chongqing. During the study period, the spatial distribution of Chongqing’s population has increased in the west and decreased in the east, while also increased in low-altitude areas and decreased in medium-high altitude areas. Population agglomeration was common in all of districts and counties and the population density of central urban areas and its surrounding areas significantly increased, while that of non-urban areas such as northeast Chongqing significantly decreased.

Analysis of 3D Terrain Reconstruction Model Based on Bezier Triangular Surface

2011 ◽  
Vol 88-89 ◽  
pp. 755-758
Author(s):  
Bing Yan He ◽  
Jian Jun Cui
Keyword(s):  
3D Reconstruction ◽  
3D Modeling ◽  
General Procedure ◽  
Terrain Modeling ◽  
Model Based ◽  
3D Terrain ◽  
Triangular Network ◽  
Reconstruction Model ◽  
Terrain Surface

The paper researches the general procedure and method of 3D modeling on the mine terrain surface. The terrain modeling is being reconstructed with Delaunay triangular network. On this basis, Bezier triangular surface is adopted to approach, which effectively solves the problems of unsmooth surface and large amount of data caused by 3D reconstruction.

scholarly journals StratomeX: Visual Analysis of Large-Scale Heterogeneous Genomics Data for Cancer Subtype Characterization

2012 ◽  
Vol 31 (3pt3) ◽  
pp. 1175-1184 ◽  
Author(s):  
A. Lex ◽  
M. Streit ◽  
H.-J. Schulz ◽  
C. Partl ◽  
D. Schmalstieg ◽  
...  
Keyword(s):  
Large Scale ◽  
Visual Analysis ◽  
Cancer Subtype

scholarly journals InSight2: A Modular Visual Analysis Platform for Network Situational Awareness in Large-Scale Networks

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1747
Author(s):  
Hansaka Angel Dias Edirisinghe Kodituwakku ◽  
Alex Keller ◽  
Jens Gregor
Keyword(s):  
Real Time ◽  
Computer Networks ◽  
Network Flow ◽  
Large Scale ◽  
Visual Analysis ◽  
Situational Awareness ◽  
Monitoring Network ◽  
Network Activity ◽  
Flow Data ◽  
Large Scale Networks

The complexity and throughput of computer networks are rapidly increasing as a result of the proliferation of interconnected devices, data-driven applications, and remote working. Providing situational awareness for computer networks requires monitoring and analysis of network data to understand normal activity and identify abnormal activity. A scalable platform to process and visualize data in real time for large-scale networks enables security analysts and researchers to not only monitor and study network flow data but also experiment and develop novel analytics. In this paper, we introduce InSight2, an open-source platform for manipulating both streaming and archived network flow data in real time that aims to address the issues of existing solutions such as scalability, extendability, and flexibility. Case-studies are provided that demonstrate applications in monitoring network activity, identifying network attacks and compromised hosts and anomaly detection.

Study on The Extraction Method and Spatial-temporal Characteristics of Irrigated Land in Zhangjiakou City

2020 ◽  
Author(s):  
Zijuan Zhu ◽  
Lijun Zuo ◽  
Zengxiang Zhang ◽  
Xiaoli Zhao ◽  
Feifei Sun ◽  
...  
Keyword(s):  
Decision Tree ◽  
Extraction Method ◽  
Large Scale ◽  
Group Development ◽  
Development Trend ◽  
Mountainous Areas ◽  
Vegetation Growth ◽  
Vegetation Water Content ◽  
Decision Tree Classification ◽  
Vegetation Water

<p>In order to balance the economic and ecological interests, suitable farmland structures in different regions need be established which require understanding the current distribution pattern of irrigated and dry croplands, as well as the evolution rules and reasons of that. In this paper, irrigated croplands in 1985, 2000 and 2015 in Zhangjiakou city which is in the northwest from Beijing were extracted. The study area was divided into Bashang and Bxia aeras depending climate, terrain and agrotype. NDVIs and NDWIs from May to August reflecting vegetation growth and water indexes reflecting vegetation water content were adopted and decision tree classification method was employed. As a result, classification accuracies were high and meet the replying demand with 80.05% and 93.00% in Bashang and Baxia areas respectively. The classification results show that the area of irrigated lands was extended lightly, increasing about 12.73%, reached to 686127 km<sup>2</sup>. Among them, there was 331438 km<sup>2</sup> converted from dryland with the proportions as 54.45%. By contrast, about 272419 km<sup>2</sup> irrigated croplands were transformed to drylands. But the plots areas of irrigated croplands were larger, showing a group development trend which is related to the large-scale development of the local vegetable industry in Bashang area. The total area of irrigated croplands was become bigger in intermontane plain around the rivers, while decreased in mountainous areas in Baxia area.</p>

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