International Symposium on Digital Earth最新文献_第2页

Estimating the presence of people from aggregate cell phone network activity 通过手机网络活动总量来估计人群的存在

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.872323

Andrea Vaccari, Filippo L. Scognamiglio Pasini

{"title":"Estimating the presence of people from aggregate cell phone network activity","authors":"Andrea Vaccari, Filippo L. Scognamiglio Pasini","doi":"10.1117/12.872323","DOIUrl":"https://doi.org/10.1117/12.872323","url":null,"abstract":"We present a methodology for the analysis of aggregate cell phone network activity that allows estimating the presence of people in geographical areas at the scale of the borough. The methodology is based on hourly counts of GSM network data handled by a major Dutch telecom operator over the metropolitan area of Amsterdam. Our methodology is structured in four steps. First we build an allocation function that indicates how to redistribute the by-antenna statistics to each borough. Second we analyze the trends of the temporal signatures of the boroughs and we select the clusters with minimum inter-cluster variation. Then we analyze the correlation of two demographic measures against data from the network during the selected temporal clusters. Finally we show that location updates are a good proxy for estimating the presence people, and that their variations over time reflect major trends of social dynamics. We also discuss how the analysis of GSM network activity can provide unprecedented insights on how crowds move in the city. We finally discuss our future work, whose outcomes we believe have the potential to solve real-world problems like crowd management, the support for special events, and the analysis of urban dynamics and urban policies.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132492178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Interferometric and polarimetric SAR for glacier investigation in west China 干涉和偏振SAR在中国西部冰川调查中的应用

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.873212

Zhen Li, Jianmin Zhou, B. Tian, Lei Huang

引用次数: 0

Spatial and temporal variations of vegetation communities in the Shanghai Nanhui tidal flat over 60 years 上海南汇潮滩60年来植被群落的时空变化

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.873255

Zhen Han, Yu Liu, Yongfei Guo, Hong Zhang, C.‐X. Yun

引用次数: 0

An address geocoding method for improving rural spatial information infrastructure 一种改善农村空间信息基础设施的地址地理编码方法

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.872298

Yuchun Pan, Baisong Chen, Zhou Lu, Shuhua Li, Jingbo Zhang, Yanbing Zhou

{"title":"An address geocoding method for improving rural spatial information infrastructure","authors":"Yuchun Pan, Baisong Chen, Zhou Lu, Shuhua Li, Jingbo Zhang, Yanbing Zhou","doi":"10.1117/12.872298","DOIUrl":"https://doi.org/10.1117/12.872298","url":null,"abstract":"The transition of rural and agricultural management from divisional to integrated mode has highlighted the importance of data integration and sharing. Current data are mostly collected by specific department to satisfy their own needs and lake of considering on wider potential uses. This led to great difference in data format, semantic, and precision even in same area, which is a significant barrier for constructing an integrated rural spatial information system to support integrated management and decision-making. Considering the rural cadastral management system and postal zones, the paper designs a rural address geocoding method based on rural cadastral parcel. It puts forward a geocoding standard which consists of absolute position code, relative position code and extended code. It designs a rural geocoding database model, and addresses collection and update model. Then, based on the rural address geocoding model, it proposed a data model for rural agricultural resources management. The results show that the address coding based on postal code is stable and easy to memorize, two-dimensional coding based on the direction and distance is easy to be located and memorized, while extended code can enhance the extensibility and flexibility of address geocoding.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133309490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Derivation of glacier velocity from SAR data with feature tracking 基于特征跟踪的SAR数据冰川速度的推导

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.873220

Lei Huang, Zhen Li

引用次数: 0

Susceptibility assessment of earthquake-triggered landslide in Wenchuan 汶川地震诱发滑坡易感性评价

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.873273

Shuangjiang Tao, D. Hu, Wenji Zhao

引用次数: 1

Remote sensing to analysis of the land cover changes in Wuhan from 1991 to 2006 1991 - 2006年武汉市土地覆盖变化的遥感分析

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.873237

Qiong Luo, Si Chen

{"title":"Remote sensing to analysis of the land cover changes in Wuhan from 1991 to 2006","authors":"Qiong Luo, Si Chen","doi":"10.1117/12.873237","DOIUrl":"https://doi.org/10.1117/12.873237","url":null,"abstract":"Rapid urbanization is the main driving force of land cover change in metropolitan Wuhan. This is especially critical with respect to the many lakes and shallow water bodies. Land cover changes from 1991 to 2006 were mapped by classifying Landsat TM images (1991, 2002, and 2006). Different band combinations were used to build high-quality false-color images; the spectral separability of sets of training pixels was then evaluated by contingency matrices and feature space plots. Maximum likelihood supervised classification was applied to extract built-up areas, vegetated areas and water bodies. Post-classification was carried out to detect the land cover changes. From the classification, vegetation and built-up areas expanded at the expense of water bodies. Further comparison of the variety in LULC was analyzed in both temporal and spatial aspects between 1991-2002 and 2002-2006. The growth rate of built-up area from 2002-2006 is 55.7%, which is much higher than the rate from 1991 to 2002, whereas water bodies decreased more in the first period. Vegetation increased in the first period and then decreased slightly in the second. This analysis showed urban expansion is mainly along Yangtze River and along the East-West axis. These spatio-temporal characteristics should allow urban planners to better understand the processes of urban sprawl in Wuhan.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124750362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Implementing a global DEM database on the sphere based on spherical wavelets 基于球面小波的球面DEM数据库的实现

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.872952

Di Zhao, Xuesheng Zhao, Shigang Shan, Liangjun Yao

引用次数: 0

Modeling toxic gas dispersion over urban area using GIS and CFD 基于GIS和CFD的城市有毒气体扩散模拟

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.873268

M. Zheng, Simin Jiang, X. Ai, Yuerong Guo

{"title":"Modeling toxic gas dispersion over urban area using GIS and CFD","authors":"M. Zheng, Simin Jiang, X. Ai, Yuerong Guo","doi":"10.1117/12.873268","DOIUrl":"https://doi.org/10.1117/12.873268","url":null,"abstract":"To simulate toxic gas dispersion over urban area with consideration of the influence of wind, buildings and other obstacles within the dispersion site, an integrated strategy incorporating computational fluid dynamics (CFD) and GIS technologies is investigated. CFD is able to couple wind field with pollutant dispersion process and provide realistic simulation for geometrically complex scenarios, however, inadequate of geometry construction for urban scale applications. This paper focuses on how to take advantage of the available GIS data, the visualization and spatial discretization capabilities of GIS in CFD modeling. Topography and building data stored in GIS database are used to extract the detailed coordinates and heights of the buildings around the area of interest. Furthermore, a methodology of domain discretization, with restrict to underneath geometrical boundary, is proposed to construct computational grids for CFD simulations. For illustration purposes, a mixed residential and commercial area of Lujiazui in Shanghai is investigated. The CFD software, CFX5.5, is employed to predict plume concentrations, and the output can be rendered dynamically in GIS environment.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130199350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A new method of road extraction from high-resolution remote sensing imagery 一种高分辨率遥感影像道路提取的新方法

International Symposium on Digital Earth Pub Date : 2009-09-26 DOI: 10.1117/12.872963

Cui Ni, Z. Guan, Q. Ye

引用次数: 1