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2018 26th International Conference on Geoinformatics最新文献

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An Improved Model for Effective Customer Network Future State Prediction 一种改进的有效客户网络未来状态预测模型
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557185
Zeng Rui, Hongli Yin, Jinyan Cai
For the purpose of prediction analysis of customer relationships in social networks, this paper proposes a simple model that can generate future states of a social network based on relevant data analysis and previous research. In this model, we insert nodes and edges of a customer network at the same preferential attachment probabilities, but delete them at different anti-preferential attachment probabilities with the consideration of the limit of network size, the directions of incident links and the factor of time in attractiveness. Furthermore, we propose an improved model based on the simple model that computes the attractiveness measure of nodes by applying time series prediction and takes into account of node in-degrees. Networks generated from our models have a nice property that their in-degree distribution follows the power-law, which desirably characterizes an essential property of social networks. This property is derived by applying the mean-field theory [7]. It is validated through simulation that this model can effectively generate a social network's future state and incorporating the factor of node in-degrees in computing the attractiveness measure of nodes using time series prediction can improve the prediction result.
为了对社交网络中的客户关系进行预测分析,本文在相关数据分析和前人研究的基础上,提出了一个简单的可以生成社交网络未来状态的模型。在该模型中,考虑网络规模的限制、事件链接的方向和吸引力的时间因素,以相同的优先依附概率插入客户网络的节点和边缘,以不同的反优先依附概率删除它们。在此基础上提出了一种改进模型,利用时间序列预测计算节点的吸引力度量,并考虑了节点的关联度。由我们的模型生成的网络有一个很好的属性,即它们的度分布遵循幂律,这是社会网络的一个基本属性。这一性质是应用平均场理论推导出来的[7]。仿真结果表明,该模型能够有效地生成社会网络的未来状态,并且在使用时间序列预测计算节点吸引力度量时加入节点度因子可以改善预测结果。
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引用次数: 0
A Practice to Search the Summit of a DEM Using Simulated Annealing Technique 模拟退火技术在DEM顶点搜索中的应用
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557171
Mengdi Wang, Kun Zhang
Simulated annealing (SA) algorithm is based on iterative improvement but with stochastic acceptance of bad moves. This allows the algorithm to escape local optimal solution in early sampling rounds and the progressive refinement into efficient solutions in later sampling rounds. In this paper, we show how this algorithm is used to find the highest peak of a Digital Elevation Model (DEM). In order to search efficiently in the terrain data, we proposed a reformed cost function which used logarithmic transformation. A set of parameters were confirmed after many experiments. The result shows that SA is not guarantee to find the optimal solution. However, there are 16% chances to find the highest peak during 400 experiments. Specifically, the search process is demonstrated by 3D visualization in GIS, which can help understand the mechanism of the algorithm and provide convenience for teaching.
模拟退火算法是一种基于迭代改进的算法,但对坏棋的接受是随机的。这允许算法在早期的采样轮中避免局部最优解,并在随后的采样轮中逐步细化为有效解。在本文中,我们展示了如何使用该算法来查找数字高程模型(DEM)的最高峰。为了在地形数据中高效搜索,提出了一种采用对数变换的改进代价函数。经过多次实验,确定了一组参数。结果表明,SA算法不能保证找到最优解。然而,在400次实验中,有16%的机会找到最高峰。具体来说,通过GIS中的三维可视化展示了搜索过程,有助于理解算法的机制,为教学提供方便。
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引用次数: 0
Analysis of China's Urban Network Structure from the Perspective of “Streaming” “流”视角下的中国城市网络结构分析
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557078
Qiqi Zhang, Tao Yuan
The urban network is an extension and improvement of the study of the traditional urban and regional spatial structure. It is one of the hot topics in the study of urban geography. Based on the Tencent LBSN data to build a city network, this paper uses the centrality and influence indicators to rank the importance and influence of the nodes of the Chinese urban network according to the complex network theory, and then integrates the methods of community detection and other methods to analyze the characteristics of the urban network in China during the transition period. The research shows that: $bigcirc!!!!1$. The eigenvector centrality and PageRank take into account the number and quality of neighbor nodes at the same time. It can identify the important city nodes more effectively, and the identified urban network accords with Pareto law. $bigcirc!!!!!2$. The four major urban agglomerations of the Beijing-Tianjin-Hebei region, the Yangtze River Delta, the Pearl River Delta and Chengdu-Chongqing have a clear network structure. The national urbanization development strategy and important transportation facilities have a directional effect on the urban network. $bigcirc!!!!!3$. The urban network structure conforms to the “Hu Huanyong Line” law. However, the networks of the Guanzhong city group, the Lanzhou-Xining city group, the Hubao Egu city group, and the urban slopes of the northern slope of the Tianshan Mountains centered on U rumqi began to appear. Important infrastructure construction such as the “Lanxin Line” and the “Belt and Road” strategy have become potential forces for guiding the urban system to break through the “Hu Huanyong Line”. 4Central cities in Central China, Fujian Province, and Northeast China have a low level of network development and do not match the regional functions undertaken. Central cities in Central China, Fujian Province, and Northeast China have a low level of network development and do not match the regional functions undertaken. $bigcirc!!!!!5$. The phenomenon of excessive monopoly in the Pearl River Delta urban agglomeration should be given attention, and the links between key node cities and surrounding cities should be strengthened to ease the pressure on the core cities. Overall, LBSN data can effectively reveal the characteristics of China's urban network structure during the transition period, and improve effective case support for regional coordinated development, transportation system planning and construction.
城市网络是对传统城市和区域空间结构研究的延伸和完善。它是城市地理学研究的热点之一。本文基于腾讯LBSN数据构建城市网络,根据复杂网络理论,利用中心性和影响力指标对中国城市网络节点的重要性和影响力进行排序,然后结合社区检测等方法,分析转型期中国城市网络的特征。研究表明:$bigcirc!!!!特征向量中心性和PageRank同时考虑了邻居节点的数量和质量。该方法能更有效地识别出重要的城市节点,识别出的城市网络符合帕累托定律。美元 bigcirc !!!!! 2美元。京津冀、长三角、珠三角、成渝四大城市群网络结构清晰。国家城市化发展战略和重要交通设施对城市网络具有方向性作用。美元 bigcirc !!!!! 3美元。城市网络结构符合“胡焕庸线”规律。但以乌鲁木齐为中心的关中城市群、兰西宁城市群、虎宝古城市群和天山北坡城市斜坡网络开始出现。“兰新线”、“一带一路”战略等重要基础设施建设,成为引导城市体系突破“胡焕庸线”的潜在力量。4中部、福建、东北中心城市网络发展水平较低,与承担的区域功能不匹配。中部、福建、东北中心城市网络发展水平较低,与所承担的区域功能不匹配。美元 bigcirc !!!!! 5美元。要重视珠三角城市群的过度垄断现象,加强重点节点城市与周边城市的联系,缓解核心城市的压力。总体而言,LBSN数据可以有效揭示转型期中国城市网络结构特征,为区域协调发展、交通系统规划建设提供有效的案例支持。
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引用次数: 0
A Top-Down Application of Multi-Resolution Markov Random Fields with Bilateral Information in Semantic Segmentation of Remote Sensing Images 基于双边信息的多分辨率马尔可夫随机场自顶向下在遥感图像语义分割中的应用
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557117
Hongtai Yao, Min Zhang, Bingxue Wang
This paper presents a new multi-resolution Markov Random Field (MRF) method for semantic segmentation of remote sensing images. The main contribution of this paper is to propose a new method of information interaction between the scales so that macroscopic information and microscopic information can be captured on each scale. First, we established a multi-scale structure. Second, in the modeling process of label field in each scale, we not only consider the spatial information between the pixels of the layer. But also take the spatial interaction between this layer and its upper and lower layers into account. Finally, using the most classic the maximum a posterior (MAP) criteria, start from the top level and solve it layer by layer. Experiments were performed on texture image, synthetic geographic image and remote sensing image. These experiments show that the proposed method provides a better performance than other Markov-based methods. (The accuracy increases by about 2%).
提出了一种新的多分辨率马尔可夫随机场(MRF)遥感图像语义分割方法。本文的主要贡献是提出了一种新的尺度间信息交互的方法,从而可以在每个尺度上捕获宏观信息和微观信息。首先,我们建立了一个多尺度结构。其次,在每个尺度的标签域建模过程中,我们不仅考虑了层像素之间的空间信息。但也要考虑到这一层与上层和下层之间的空间相互作用。最后,利用最经典的最大后验(MAP)准则,从最顶层开始逐层求解。在纹理图像、合成地理图像和遥感图像上进行了实验。实验结果表明,该方法比其他基于马尔可夫的方法具有更好的性能。(准确度提高约2%)。
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引用次数: 0
Cloud Platform for the Management of Tourism Resources 旅游资源管理云平台
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557190
Chibin Wang, Jun Luo, Shaofu Lin, Jing Zhang, Zifu Wang, Anyu Luo
With the growing demand of applicational support for various kinds of tourism applications, this study aims to apply big data on the tourism industry and build applications for tourism resources that support the distributed storage, parallel computing, application analysis, data information sharing and interaction that support the census data of tourism resources. Deeper data support for the project of constructing tourism census database is provided by the big data support platform. Advanced, efficient and scientific platform environment of storage, calculation and analysis of the resources is also provided for escorting the goal of developing the entire-region tourism and building Guizhou as a world-famous tourism destination. Cloud computing provides fundamental support to address the challenges with shared computing resources including computing, storage, networking and analytical software. The application of these resources has fostered impressive big data advancements.
随着各类旅游应用对应用支撑的需求日益增长,本研究旨在将大数据应用于旅游产业,构建支持旅游资源普查数据的分布式存储、并行计算、应用分析、数据信息共享和交互的旅游资源应用。大数据支撑平台为旅游普查数据库建设项目提供更深层次的数据支持。提供先进、高效、科学的资源存储、计算、分析平台环境,为实现全区旅游大发展、建设世界旅游目的地的目标保驾护航。云计算为解决共享计算资源(包括计算、存储、网络和分析软件)带来的挑战提供了基础支持。这些资源的应用促进了令人印象深刻的大数据进步。
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引用次数: 1
A Comprehensive Spatial Assessment Method of Medical Facilities Under Hierarchical Medical System: A Case Study in Shenzhen City 分级医疗体系下医疗设施空间综合评价方法——以深圳市为例
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557077
Wei Hu, M. Su, Chengyun Yang
At present, researches of spatial assessment of medical facilities prefer to consider single factor and have problems such as lack of spatial accuracy, and lack of consideration for the multi-level medical system. This paper constructs a comprehensive assessment method which includes three dimensions: supply and demand, travel convenience and equilibrium. And it considers hospitals and the primary health service facilities. The empirical research is carried out by taking Shenzhen city as an example. The results show that the assessment method proposed is an effective tool for in-depth analysis of medical facilities problems from space, which has important reference value for the optimization of medical service facilities; The service gap of Shenzhen general hospitals and community health centers are large, and the construction of medical facilities needs to be strengthened to increase the total supply level; Shenzhen general hospitals trend to concentrate towards the city center, so planning and management guidance is needed; The space configuration of community health center is relatively balanced, but more community health center are needed in the outer circle to improve the spatial convenience and the equilibrium level.
目前的医疗设施空间评价研究多考虑单一因素,存在空间精度不高、缺乏对多层次医疗系统的考虑等问题。本文构建了一个包括供需、出行便利和均衡三个维度的综合评价方法。它还考虑了医院和初级卫生服务设施。本文以深圳市为例进行了实证研究。结果表明,所提出的评价方法是从空间上深入分析医疗设施问题的有效工具,对优化医疗服务设施具有重要的参考价值;深圳市综合医院和社区卫生中心服务缺口较大,需加强医疗设施建设,提高总供给水平;深圳综合医院有向市中心集中的趋势,需要进行规划管理指导;社区卫生中心的空间配置相对均衡,但外圈需要更多的社区卫生中心,以提高空间便利性和均衡水平。
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引用次数: 0
The City Gravity Migration of the Urban Agglomeration in the Middle Reach of Yangtze River Based on DMSP Nighttime Light 基于DMSP夜间光的长江中游城市群城市重力迁移
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557091
Wen Zhang, Min Li, Changhui Yu, L. Meng
The urban agglomerations in the middle reaches of the Yangtze River occupy an important position in the regional development pattern of China. Grasping the spatial and temporal development pattern of urban agglomerations accurately is of great significance for the planning and development of urban agglomerations. This paper selects the DMSP/OLS nighttime stable lighting data from year 1993 to year 2011, extracts the annual urban land area of 33 cities in the city group based on the threshold value, and calculates the total annual nighttime light intensity value and the growth rate of each city. By using the center of gravity model and statistical data, the distances and angles of shifts in the centers of gravity of the three major urban agglomerations in the middle reaches of the Yangtze River are explored. Studies have shown that in the past 20 years, the urban agglomeration in the middle reaches of the Yangtze River have achieved rapid development during the year 1993 to year 2011, and the total nighttime light has increased by about 5 times. The center of gravity of urban agglomerations in the middle reaches of the Yangtze River has gradually shifted from the northwest to the southeast, and the migration distance has gradually become smaller since 2004, and the center of gravity of urban agglomerations has gradually stabilized.
长江中游城市群在中国区域发展格局中占有重要地位。准确把握城市群的时空发展格局,对城市群的规划与发展具有重要意义。本文选取DMSP/OLS 1993 - 2011年夜间稳定照明数据,根据阈值提取城市群中33个城市的全年城市用地面积,计算各城市全年夜间光强总量值和增长率。利用重心模型和统计数据,对长江中游三大城市群的重心位移距离和位移角度进行了探讨。研究表明,近20年来,长江中游城市群在1993年至2011年期间实现了快速发展,夜间照明总量增长了约5倍。2004年以来,长江中游城市群重心逐渐由西北向东南转移,迁移距离逐渐变小,城市群重心逐渐稳定。
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引用次数: 2
A High-Realistic Texture Mapping Algorithm Based on Image Sequences 基于图像序列的高真实感纹理映射算法
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557175
Yuwei Yang, Yaping Zhang
3D reconstruction using multiple views allows for the restoration of a complete geometric model, but does not produce textural effects. Most of the existing texture mapping methods are aimed at the scanning reconstruction models, and few of them can be used to deal with the models with large amount of data and complex structure. We propose a high-realistic texture mapping algorithm based on image sequences. Firstly, the image sequence is sampled by using the spatio-temporal adaptive method. Then, the parameters of the camera and the size of each image are extracted by means of the Bundler, and the optimal texture image is selected for each triangular patch through the Markov random field. Finally, due to excessive loading of image data, it is necessary to reduce the texture data and only retain the effective parts mapped onto each triangular patch. Our method ensures that the resolution of the model after texture mapping is higher, and there is no obvious texture seam.
使用多个视图的3D重建允许恢复完整的几何模型,但不产生纹理效果。现有的纹理映射方法大多针对扫描重建模型,很少有方法能够处理数据量大、结构复杂的模型。提出了一种基于图像序列的高真实感纹理映射算法。首先,采用时空自适应方法对图像序列进行采样;然后,通过Bundler提取相机参数和每张图像的大小,并通过马尔可夫随机场为每个三角形斑块选择最优纹理图像。最后,由于图像数据的过度加载,需要减少纹理数据,只保留映射到每个三角形patch上的有效部分。我们的方法保证了纹理映射后的模型分辨率更高,并且没有明显的纹理缝。
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引用次数: 4
HiAccess: A Parallel Method for Measuring High-Resolution Spatial Accessibility in Real Time HiAccess:一种实时测量高分辨率空间可达性的并行方法
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557126
Mengyu Ma, Ye Wu, N. Guo, Luo Chen, Qi Gong, Jun Yu Li
Accessibility is an important issue in transport geography, land planning and many other related fields. Accessibility problems become computationally demanding when involving high-resolution requirements. Using conventional methods, providing high-resolution accessibility analysis for real time decision support remains a challenge. In this paper, we present a parallel method, named HiAccess, to solve the high-resolution accessibility analysis problems in real time. Pointing at accelerating accessibility analysis, we proposed an extended road network structure. Correspondingly, a fast road network construction method is proposed, in which the road network topology is determined by traversing the original road nodes only once. The parallel strategies of HiAccess are fully optimized through theoretical analysis and experimental comparisons. HiAccess demonstrates the striking performance of measuring high-resolution (using 100 $text{m}times 100text{m}$ grids) accessibility of a city (in total over 250k grids, roads with 232k segments, 40 facilities) in 1 second without preprocessing, while ArcGIS takes nearly 1 hour to achieve a less satisfactory result.
可达性是交通地理学、土地规划和许多其他相关领域的重要问题。当涉及高分辨率需求时,可访问性问题在计算上要求很高。使用传统方法,为实时决策支持提供高分辨率可访问性分析仍然是一个挑战。本文提出了一种并行方法HiAccess,用于实时解决高分辨率可达性分析问题。为了加速可达性分析,我们提出了一个扩展的路网结构。相应地,提出了一种快速路网构建方法,该方法只需遍历原始道路节点一次即可确定路网拓扑结构。通过理论分析和实验比较,对HiAccess的并行策略进行了充分优化。HiAccess在不进行预处理的情况下,在1秒内测量一个城市(总共超过250k个网格,232k个路段的道路,40个设施)的高分辨率(使用100 $text{m} × 100text{m}$网格)的可达性,表现出了惊人的性能,而ArcGIS则需要近1个小时才能达到令人不满意的结果。
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引用次数: 0
Methods for Extracting Urban Construction Land Using Night-Light Data: Assessment and Application 基于夜光数据的城市建设用地提取方法评价与应用
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557139
Junzhong Tan, Mei Zhang, Xin Tan
As a new data source, night light remote sensing data are more suitable for the background of rapid urbanization in China. Therefore, in recent years, many scholars have used the night light remote sensing data to extract and study the expansion of urban construction land. However, researchers are still trying to find better methods to avoid the internal defects of night light data. This study assessed the advantages and disadvantages of existing methods for extracting urban construction land using night light data through actual applications. The results indicated that the areas of urban construction lands extracted using threshold methods were much closer to the authoritative data, and the shape coincidence degrees were also better, while the shape similarity degrees of urban construction lands extracted using the neighborhood analysis method were much better. Further analyses revealed that we may find a better method for extracting urban construction land by considering both the intensity of night light data and the natural boundaries of cities and towns.
夜光遥感数据作为一种新的数据来源,更适合中国快速城市化的背景。因此,近年来,许多学者利用夜光遥感数据提取和研究城市建设用地的扩张情况。然而,研究人员仍在努力寻找更好的方法来避免夜间灯光数据的内部缺陷。本研究通过实际应用,评价了利用夜间灯光数据提取城市建设用地的现有方法的优缺点。结果表明:阈值法提取的城市建设用地面积更接近权威数据,形状符合度更好,邻域分析法提取的城市建设用地形状相似度更好。进一步分析表明,综合考虑夜间灯光数据强度和城镇自然边界,可以找到更好的城镇建设用地提取方法。
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引用次数: 2
期刊
2018 26th International Conference on Geoinformatics
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