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2018 26th International Conference on Geoinformatics最新文献

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Spatial Distribution Pattern of High-End Hotels Based on Multi-Source Data — A Case Study of Central Beijing City 基于多源数据的高端酒店空间分布格局——以北京市中心城区为例
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557056
Yin Xu, Y. Tao
It is of great practical significance to study the spatial distribution pattern of customer attractiveness of high-end hotels in Beijing. This paper firstly employed Analytic Hierarchy Process (AHP) to construct the evaluation system of customer attractiveness in central Beijing, then the kernel density analysis tool (KDE) was adopted to make spatial agglomeration analysis of the customer attractiveness of high-end hotels in central Beijing. The following findings were obtained: a) the overall scores of high-end hotels in central Beijing are at a high level, but an obvious score polarization between the hotels and large difference between the highest and lowest scores were observed. The three first-level indicators of traffic location, service facilities and customer satisfaction make great contributions to the customer attractiveness ranking of high-end hotels, but the impact of hotel price and reviews popularity is not obvious. b) The attractiveness of high-end hotels in central Beijing shows a spatial distribution pattern of “one core with many hearts and decreasing circle layers”. In terms of the number of high-end hotels in different administrative districts, Dongcheng District has the largest number of high-end hotels, followed by Haidian District, Xicheng District, Fengtai District and Shijingshan District. Four levels of hotel with attractiveness from high to low spread from the city center to the edge. The research findings are expected to provide useful suggestions for hotel managers and government tourism agencies.
研究北京高档酒店顾客吸引力的空间分布格局具有重要的现实意义。本文首先运用层次分析法(AHP)构建北京市中心城区客户吸引力评价体系,然后运用核密度分析工具(KDE)对北京市中心城区高端酒店客户吸引力进行空间集聚分析。结果表明:①北京市中心城区高档酒店总体得分较高,但酒店间得分分化明显,最高和最低得分差异较大;交通位置、服务设施和顾客满意度三个一级指标对高档酒店的顾客吸引力排名贡献较大,但对酒店价格和评论人气的影响不明显。(2)北京市中心城区高端酒店吸引力呈现“一核多心、圈层递减”的空间分布格局。从不同行政区域的高端酒店数量来看,东城区高端酒店数量最多,其次是海淀区、西城区、丰台区和石景山区。吸引力由高到低的四级酒店从城市中心向边缘延伸。研究结果可望为酒店管理者及政府旅游机构提供有益的建议。
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引用次数: 0
A Survey of Statistical Topic Model for Multi-Label Classification 多标签分类统计主题模型综述
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557113
Lin Liu, L. Tang
Much of texts embedded in Web is annotated with human interpretable labels, such as tags on web pages and subject. Statistic topic model for multi-label classification is a power technology to handle the multi-labeled textual data at the word level. However, standard topic model is a completely unsupervised algorithm. Therefore, the key of incorporating supervised label set into its topic modeling procedure is to establish the relationship between topics and labels. In this paper, multi-label topic model is summarized by analysis of existing studies; especially, on the basis of relationship between topics and labels, we describe four categories of multi-label topic model, and their reprehensive models. To the best of our knowledge, this is the first effort to review the development of multi-label topic models.
嵌入到Web中的许多文本都带有人类可解释的标签,例如网页和主题上的标签。用于多标签分类的统计主题模型是在词级处理多标签文本数据的一种强大技术。而标准主题模型是一种完全无监督的算法。因此,将监督标签集纳入其主题建模过程的关键是建立主题与标签之间的关系。本文通过对已有研究的分析,对多标签主题模型进行了总结;特别是在主题与标签关系的基础上,我们描述了四类多标签主题模型及其综合模型。据我们所知,这是第一次回顾多标签主题模型的发展。
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引用次数: 4
Research on Base64 Encoding Algorithm and PHP Implementation Base64编码算法及PHP实现研究
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557068
W. Somchai, Da Wen
In order to realize the data encryption of enterprise information platform, the principle of Encryption and Decryption of Base64 algorithm is expatiated and explained in detail. Through the combination of graphic narrative, so that readers can through examples of applications, quick grasp of Base64 algorithm encryption and decryption work and storage principle. At the same time combined with the actual software development process, the use of the principle of Base64 algorithm PHP to achieve the enterprise information stored in the process of data encryption and decryption function.
为了实现企业信息平台的数据加密,对Base64算法加解密原理进行了详细的阐述和说明。通过图文结合的叙述方式,使读者能够通过实例应用,快速掌握Base64算法的加解密工作原理和存储原理。同时结合实际的软件开发过程,利用PHP的Base64算法原理实现了企业信息存储过程中数据的加解密功能。
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引用次数: 10
Semantic Annotation of 3D Architecture Models Based on the Geometric Structure Characteristics 基于几何结构特征的三维建筑模型语义标注
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557107
Xuan Sun
A digital city is the basis of the Smart city. With the deepening exploration of smart applications, traditional geometric models become hard to satisfy the needs of precise space description in urban planning and management. How to add meanings to the spatial data and construct semantic models of cities has been one of questions of Geo-informatics nowadays. In this paper, we propose an automatic approach to achieve semantic annotation of 3D architecture models, which are the main components of cityscapes in the virtual environment. On one hand, all the concave and convex features on the surfaces are extracted as the clues to decompose the architecture models into different structural parts in geometry; On the other hand, the positions, shapes, sizes, and configurations of the extracted structural parts are analyzed to decide the semantic category that each of them belongs to. To verify the effectiveness of the approach, experiments have been carried out on a number of architecture models, and the semantic cognition capability of the approach is demonstrated.
数字城市是智慧城市的基础。随着智能应用探索的不断深入,传统的几何模型已经难以满足城市规划管理中对空间精确描述的需求。如何为城市空间数据添加意义,构建城市语义模型,是当前地理信息学研究的热点问题之一。本文提出了一种自动实现虚拟环境中城市景观的主要组成部分——三维建筑模型语义标注的方法。一方面,提取所有表面上的凹凸特征作为线索,将建筑模型分解为几何上不同的结构部分;另一方面,对所提取的结构件的位置、形状、尺寸和配置进行分析,确定每个结构件所属的语义类别。为了验证该方法的有效性,在多个体系结构模型上进行了实验,验证了该方法的语义认知能力。
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引用次数: 1
Extracting Coach Schedule Information from Massive Trajectory Data 从大量轨迹数据中提取教练机时刻表信息
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557100
Jun Yu Li, Qingqi Li, Yan Zhu, Yan Ma, Ya’nan Zhou
In view of the difficulties in obtaining nationwide coach schedules, we propose a method of automatically extracting schedule information from massive trajectory data of coaches. We used the Density-Based Spatial Clustering of Applications with Noise algorithm to identify locations of coach stations from the long time-series of historical trajectories, use the application programming interface of online maps to extract station names, and finally extract coach schedules based on multiple trajectories. Experimental results in the Jing-Jin-Ji area validate the effectiveness and accuracy of the proposed method. This method can be used to obtain nationwide coach schedule information in a fast and low cost way.
针对目前全国范围内列车时刻表难以获取的问题,提出了一种从大量列车轨迹数据中自动提取列车时刻表信息的方法。利用基于密度的应用噪声空间聚类算法从历史轨迹的长时间序列中识别公交车站的位置,利用在线地图的应用程序编程接口提取车站名称,最后基于多轨迹提取公交时刻表。京津冀地区的实验结果验证了该方法的有效性和准确性。该方法可以快速、低成本地获取全国范围内的航班时刻表信息。
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引用次数: 0
Study on the Temporal and Spatial Variation of PM2.5 in Eight Main Cities of Yunnan Province 云南省8个主要城市PM2.5时空变化特征研究
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557198
M. Teng, Kun Yang, Yan Shi, Yi Luo
Air haze pollution has a serious impact on human health, ecological environment and climate change. In recent years, with the introduction of new national policies and people's increasing awareness of environmental protection, haze has received widespread social attention. Haze pollution in China has always been a prominent environmental problem. The main reason for the frequent occurrence of haze pollution is PM2.5, which not only occurs in cities with high degree of industrialization or urbanization, but also often appear in regions with good air quality. This paper selects eight main cities in Yunnan Province as the research area, and uses the measured PM2.5 data from eight main cities in January 2015 to February 2018 in Yunnan Province as the basic data, using the eight urban meteorological data as the basic data, using the MK trend test and Correlation coefficient method to carry out research on the spatial-temporal variation and correlation of PM2.5 in the last three years in Yunnan Province. The space-time analysis shows that the average annual PM2.5 concentration in Lijiang City is the lowest, the monthly average concentration in Baoshan City is the highest, and the daily average concentration in Puer City is in a gentle trend; Except for Lijiang, the other seven cities all experienced different levels of pollution from March 17 to March 26, 2015; The concentration of PM2.5 in each city showed a seasonal pattern of “U” and a pulse-like diurnal variation pattern in winter and spring, summer and autumn; cities with higher annual average concentrations in the province are concentrated in the northeast and southwest. Correlation analysis showed that PM2.5 concentration was significantly negatively correlated with precipitation and wind speed, and negatively correlated with daily average humidity and temperature.
空气雾霾污染严重影响人类健康、生态环境和气候变化。近年来,随着国家新政策的出台和人们环保意识的增强,雾霾受到了社会的广泛关注。雾霾污染在中国一直是一个突出的环境问题。雾霾污染频繁发生的主要原因是PM2.5,它不仅发生在工业化或城市化程度高的城市,也经常出现在空气质量较好的地区。本文选取云南省8个主要城市作为研究区域,以云南省2015年1月至2018年2月8个主要城市的PM2.5实测数据为基础数据,以8个城市气象数据为基础数据,采用MK趋势检验和相关系数法对云南省近3年PM2.5的时空变化及相关性进行研究。时空分析表明,丽江市PM2.5年平均浓度最低,宝山市月平均浓度最高,普洱市日平均浓度呈平缓趋势;2015年3月17日至26日,除丽江外,其他7个城市均出现了不同程度的污染;各城市PM2.5浓度在冬春、夏秋两季均呈“U”型季节性和脉冲型日变化规律;全省年平均浓度较高的城市主要集中在东北部和西南部。相关分析表明,PM2.5浓度与降水量、风速呈显著负相关,与日平均湿度、气温呈显著负相关。
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引用次数: 2
A System Design for Virtual Reality Visualization of Medical Image 医学影像虚拟现实可视化系统设计
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557097
Kai Chen, Zaiqing Chen, Yonghang Tai, Jun Peng, Junsheng Shi, Chenqi Xia
Based on medical image data, VR technology can create a visualized three-dimensional environment of human organs in accordance with human operating habits, so that doctors can accurately determine spatial location, size, geometry, and spatial relationship with the surrounding tissue structure. This new approach will overcome the uncertainties in traditional medical visualization methods, and let doctors easily make preoperative planning and virtual surgery. This paper designed and implemented a VR visualization system for medical images, and allowing doctors to conduct disease analysis, surgical training or surgical education in a virtual environment. In particular, patients can also use virtual reality devices to communicate their illnesses with doctors, and to ease the contradiction between doctors and patients. The entire system has been basically implemented and trial run. We suggest it might has certain value for the specific application of virtual reality technology in precision medicine.
VR技术以医学影像数据为基础,根据人体操作习惯,创造出人体器官的可视化三维环境,使医生能够准确判断器官的空间位置、大小、几何形状以及与周围组织结构的空间关系。这种新方法将克服传统医学可视化方法的不确定性,使医生可以轻松地进行术前规划和虚拟手术。本文设计并实现了一个医学图像的VR可视化系统,使医生能够在虚拟环境中进行疾病分析、手术培训或手术教育。特别是,患者还可以使用虚拟现实设备与医生交流病情,缓解医患矛盾。整个制度已基本实施并开始试运行。这对于虚拟现实技术在精准医疗中的具体应用可能具有一定的价值。
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引用次数: 1
Sampling-Based Multi-Level Representation of Plotting Curves on Web Map 基于采样的Web地图绘图曲线多层次表示方法
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557094
Wenze Luo, Ye Wu, Luo Chen, N. Jing
With the development of the Internet and the enhanced rendering ability of browser end, electronic map based on the Internet, which is called web map, has been visited and plotted by more and more users. Normally, the representation of the plotting results such as the markers and curves are changed with the map level, and the traditional method is to take a strategy to select the composition points. In this paper, instead, an adaptive sampling method of plotting curves which preserves the characteristic points is proposed and a relationship between map level and the number of sampling points is established based on the Radical Law in cartography. Experiments are conducted to compare the proposed sampling method with others to validate the simplicity and accuracy. The result indicates that the proposed method can realize the sampling of plotting curves on the web map at different levels in terms of simplicity and accuracy for the multi-level representation.
随着互联网的发展和浏览器端渲染能力的增强,基于互联网的电子地图被称为web地图,被越来越多的用户访问和绘制。通常情况下,标线、曲线等绘图结果的表示形式会随着地图层次的变化而变化,传统的方法是采取策略选择构图点。本文提出了一种保留特征点的绘图曲线自适应采样方法,并基于地图学中的激进定律建立了地图水平与采样点数量的关系。通过实验将该方法与其他方法进行了比较,验证了该方法的简单性和准确性。结果表明,该方法在简单性和精度上都能实现对网络地图上不同层次的绘图曲线的采样,从而实现多层次的表示。
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引用次数: 0
Frame Interpolation Using Deep Pyramid Flow 帧插值使用深金字塔流
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557169
Shangshu Qian, Zhi-he Zhou, Shuyue Lai
In this paper, we made an attempt to generate the middle frame by analyzing an existing video. While the blurry intermediate frames generated by current methods, which are widely used, are not quite satisfying, our method combines the advantages of estimating optical flow and hallucinating the RGB value directly, which is able to generate sharp and realistic frames. Apart from that, it is unsupervised, and SSIM is applied as loss function to better our outcome. Eventually, our method was tested on the UCF-101 and THUMOS-15 dataset. It turned out that the above-mentioned approach produces high-quality and visually acceptable results, which outperforms other competing methods.
在本文中,我们尝试通过分析一个已有的视频来生成中间帧。目前使用比较广泛的中间帧产生的模糊效果不太理想,而我们的方法结合了光流估计和直接产生RGB值的优点,能够产生清晰逼真的中间帧。除此之外,它是无监督的,并且SSIM被用作损失函数来改善我们的结果。最后,我们的方法在UCF-101和THUMOS-15数据集上进行了测试。结果表明,上述方法产生了高质量和视觉上可接受的结果,优于其他竞争方法。
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引用次数: 0
Re-Estimation of the Greenland Ice Sheet Changes from ICESat Measurements with Slope Correction 基于坡度校正的ICESat测量对格陵兰冰盖变化的重新估计
Pub Date : 2018-06-01 DOI: 10.1109/GEOINFORMATICS.2018.8557165
F. Zou, Shuanggen Jin
The Greenland ice sheet, the second largest glacier in the world after the Antarctic ice sheet, is losing its mass significantly since the 21st century. Although Ice, Cloud, and land Elevation Satellite (ICESat) has been successfully applied to detect changes in the elevation of the Greenland ice sheet since its launch in 2003, there are larger uncertainty to retrieve the glacier height in the altimetry data processing. In this paper, we use repeat-tracks method with slope correction to re-process ICESat data from 2003–2008 and estimate the mass changes of Greenland ice sheet. The elevation change results varies from about −2 m/yr up to 1.5 m/yr. The well-pronounced height decrease are clearly visible in the catchment area of J akobshavn Isbrae glacier (north-western), the Helheim and Kangerdlugssuaq glaciers (south-eastern), where the elevation change rate reaches a remarkable amount of more than −2 m/yr. The elevation change rate is around zero in the northern area of the Greenland ice sheet. The elevation change rates in most of the inland arears are slightly positive with about 0.02m/yr, indicating that there are small amount of ice mass accumulation. The volume change rate of the whole Greenland ice sheet is −237.65km3/yr by the repeat-track plane fitting method from the ICESat elevation measurements. The volume change rate of the whole Greenland ice sheet is −198.54km3/r by the repeat-track with slope correction, which has a good agreement with GRACE measurements.
格陵兰冰盖是世界上仅次于南极冰盖的第二大冰川,自21世纪以来,它的质量正在显著减少。冰云和陆地高程卫星(ICESat)自2003年发射以来,已经成功地应用于格陵兰冰盖高程变化的探测,但在测高数据处理中,冰川高度的反演存在较大的不确定性。本文采用坡度校正的重复轨迹方法对2003-2008年的ICESat数据进行再处理,估算了格陵兰冰盖的质量变化。海拔变化的结果在−2 m/年到1.5 m/年之间变化。在J akobshavn Isbrae冰川(西北部)、Helheim和Kangerdlugssuaq冰川(东南部)的集水区,高度下降明显,高程变化率达到了显著的- 2 m/年以上。格陵兰冰盖北部地区的海拔变化率大约为零。大部分内陆地区高程变化率略为正,约为0.02m/yr,表明有少量的冰块堆积。根据ICESat高程测量的重复径迹平面拟合方法,整个格陵兰冰盖的体积变化率为−237.65km3/yr。经坡度修正后的重复轨迹显示,整个格陵兰冰盖的体积变化率为- 198.54km3/r,与GRACE观测值吻合较好。
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引用次数: 1
期刊
2018 26th International Conference on Geoinformatics
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