空间视图在图形数据更新中的应用研究

在研究Geodatabase数据模型的基础上,给出了空间视图的定义,探讨了基于空间视图的图形数据更新过程,设计了更新的结构图和活动图。     

大规模真实感三维地形技术综述

计算机虚拟仿真领域的地形构建及显示方法的研究动态,描述三维地形建模、基于视点相关的细分简化、基于块的格网简化、模型的纹理映射和显示控制、误差度量中,分析和总结几个主要方法的特点及使用场合．     

‘Big data’ for pedestrian volume: Exploring the use of Google Street View images for pedestrian counts

New sources of data such as ‘big data’ and computational analytics have stimulated innovative pedestrian oriented research. Current studies, however, are still limited and subjective with regard to the use of Google Street View and other online sources for environment audits or pedestrian counts because of the manual information extraction and compilation, especially for large areas. This study aims to provide future research an alternative method to conduct large scale data collection more consistently and objectively on pedestrian counts and possibly for environment audits and stimulate discussion of the use of ‘big data’ and recent computational advances for planning and design. We explore and report information needed to automatically download and assemble Google Street View images, as well as other image parameters for a wide range of analysis and visualization, and explore extracting pedestrian count data based on these images using machine vision and learning technology. The reliability tests results based on pedestrian information collected from over 200 street segments in Buffalo, NY, Washington, D.C., and Boston, MA respectively suggested that the image detection method used in this study are capable of determining the presence of pedestrian with a reasonable level of accuracy. The limitation and potential improvement of the proposed method is also discussed.     

Privacy, reconsidered: New representations, data practices, and the geoweb

Blogging, social networking, and other Web 2.0 practices have sparked widespread debate about the status and future of privacy. This paper examines an explicitly geographical aspect of Web 2.0 with respect to these debates: the geospatial web, or ‘geoweb’. As part of fundamental shifts in the kinds of geographic information available, its circulation, and representative forms it assumes, the geoweb implies new objects of privacy concern and subsequent privacy-related negotiations over the aggregate of its component information, technologies, and data praxes. Thus we argue that privacy must not only be revisited, but indeed re-conceptualized. Whereas prior research on privacy vis-à-vis geographic information technologies has tended to question what privacy ‘is’, we focus instead on the constitutive outcomes of societal struggles over privacy. We examine how privacy is being negotiated around two geoweb services - Google Street View and the Twitter GeoAPI - to illustrate that these contestations produce privacy as a social object in particular ways. We show that public discourse around actual or anticipated privacy harms stemming from geoweb services and their uses, as well as the preventatives and remedies proposed or implemented to address such harms, reconstitute the objects and practices of privacy concern, and alter the roles and relationships of state, civil and corporate actors in the construction of privacy. Finally we suggest that the geoweb raises new privacy concerns because some of its representational forms - namely geo-tagged images and self-authored texts - facilitate identification and disclosure with more immediacy and less abstraction.     

清代大地测量兴衰研究

清代前期大地测量曾得到空前的发展,这是因为当时大地测量学在欧洲的发展和当局重视引进测绘人才和技术;但后来逐渐衰落,究其衰亡之根源:腐朽的政治制度是其根,不重视哲学、科学教育的落后的教育方式是其源。     

西藏自治区沙漠化地理信息系统的研制和应用

 基于西藏自治区沙漠化普查数据库和图库,研制西藏自治区沙漠化地理信息系统,建立起“图形-属性”、“属性-图形”双向链接互通功能。系统具有主视图、属性表、统计图表、和图版等功能。利用GIS的存储、查询和地理分析功能研究沙漠化的现状,了解沙漠化危害程度,预测沙漠化发展趋势及规划防沙治沙措施等具有十分重要的意义。而将GIS应用于计算机制图、荒漠化指标体系的建立、荒漠化监测等工作中,将西藏沙漠化研究推向一个新的高度起到重要作用。     

Waterpoint management system in central district with ArcView GIS

1StudyAreaCentralDistrictisthelargestdialectinBotSWana.Itcoversanareaof146531kin',whichisroughlyonequarterofBotswana.ThedistrictborderstheRepublicofSouthcocainthesouthandeast,andZimbabweinthenorth-east.ItalsobordersNorthEastDistricttotheeast.ThenorthernboundalofthedistrictissharedfaiththeChobeDistrictandNgdrilandDistrict.Inthet"estandthesouth-u'estaledistrictbordersNgndland.Ghanzi.KwenengandKgahengDistrictS.ThedistlictisdiyridedintofiveadlnjnistrahvesubdistrictsfBobirwa.Serowemalapy…     

从《秘密情节——滕刚情爱小说》看滕刚的两性观

滕刚作品集《秘密情节——滕刚情爱小说》采用拆解式态度解读两性关系。从公开的对抗、无奈的屈服两方面分析了滕刚笔下两性对立的形式,并总结了两性对立的多样性、尖锐性和恒久性的特点;从婚姻道德的约束和话语权的不平等方面揭示了两性对立的滥觞;肯定了滕刚对两性世界平衡支点的探索。     

矿床学研究的历史观

矿床是地球历史演化的产物,每一个矿床都有其特殊的形成史和变化保存史.矿床学的基本内容应是矿床成因和矿床变化保存两个方面.以历史演化的观点查明矿床形成-变化-保存全过程,有利于矿床学理论水平的提高,也是矿产勘查工作的需要.提出历史观开展矿床学研究的三个层次:①单个矿床形成变化与保存;②区域成矿演化;③全球成矿演化.单个矿...     

Geology of coal bearing Palaeogene sediments,onshore Torquay Basin,Victoria

New mapping at Anglesea coal mine, and coal resource and deep groundwater drilling have provided new perspectives on the economically important Eastern View Group coal bearing sedimentary succession in the onshore Torquay Basin. In the Anglesea Syncline, the upper 35 m thick brown coal seam of the Eastern View Group is overlain by a low angle unconformity. Units overlying the coal seams include high energy, cross cutting sand channels of the Boonah Formation and lower energy channel and interchannel systems of the overlying Salt Creek and Anglesea Formations. The mine section can be correlated from borehole data with the Eastern View Group and Demons Bluff Group exposed in coastal cliff sections along the adjacent Anglesea to Torquay coast. Recently drilled coal and groundwater exploration bores provide new data on the extent of the coal measures in the Anglesea area, and details of the underlying Tertiary succession that include typical Otway Basin units such as the Pember Mudstone and Pebble Point Formations. The stratigraphy below the coal measures suggests that the Otway Ranges were not present during Palaeogene times. The rank of the brown coals on and around the Otway Ranges is higher than any other Tertiary coals in onshore Victoria, and they preserve similar patterns of rank distribution to the high rank black coals in the underlying Lower Cretaceous Otway Group. Evidence for large overburden thicknesses is lacking, and the high ranks may have been augmented by higher than normal geothermal gradients in the Early Tertiary. Comparisons between the observed depositional cycles, sequence stratigraphic cycles, and worldwide coastal onlap curves suggest that the observed disconformity boundaries are sequence boundaries that provide a chronostratigraphic framework. Sequences present may include TB4.1–4.5 in the overburden units, and TB 2.4–3.6 in the coal bearing interval.