基于优序图法的可拓学理论在马吉水电站岩体质量评价中的应用

文中结合可拓学理论在工程实际中的应用, 将其应用到马吉水电站坝肩某高程平硐的岩体质量评价中。基于可拓学的相关理论, 同时, 引入优序图法确定各评价指标的权重系数, 建立了硐室岩体质量评价的物元模型, 并利用该模型对PD105各硐段岩体进行了可拓学的岩体质量评价, 结果符合现场观察规律。对比之前的RMR评价方法, 认为可拓学理论在岩体质量评价中能够很好地反应水电工程岩体的工程地质特性。     

Query processing in spatial databases containing obstacles

Despite the existence of obstacles in many database applications, traditional spatial query processing assumes that points in space are directly reachable and utilizes the Euclidean distance metric. In this paper, we study spatial queries in the presence of obstacles, where the obstructed distance between two points is defined as the length of the shortest path that connects them without crossing any obstacles. We propose efficient algorithms for the most important query types, namely, range search, nearest neighbours, e‐distance joins, closest pairs and distance semi‐joins, assuming that both data objects and obstacles are indexed by R‐trees. The effectiveness of the proposed solutions is verified through extensive experiments.     

Relational distance,neoliberalism and the regulation of animal health

Using quantitative and qualitative data, this paper contributes to debates on the uneven geographies of neoliberal animal disease regulation. Specifically, the paper analyses the impacts of neoliberal reforms to animal disease regulation in Great Britain. Focussing on the case of bovine tuberculosis (bTB), the paper analyses how changes to ‘relational distance’ in animal disease regulation have led to closer relationships between regulators (veterinarians) and regulatees (farmers) which in turn has led to a departure from standardised disease regulation to approaches that emphasise greater flexibility and judgement. The paper presents quantitative analysis of bTB testing data revealing the gradual erosion of government control of bTB regulation and significant variations in disease diagnosis between vets in the private and public sectors. Drawing on interviews with senior veterinarians in Government and veterinary organisations, the paper shows how these regulatory structures evolved and came to be accepted despite their limitations. The paper concludes by considering how relational distance contributes to an understanding of the nature of disease and its implications for the wider regulation of animal disease.     

Assisted network governance: An inclusive innovation to mitigate extreme water scarcity

We study a local innovation of natural resource governance in Chile in times of extreme water scarcity. Through the issuance of a scarcity decree, the government obliges local water user associations (WUAs) to reach viable water redistribution agreements in order to avoid being overruled by the state. In the Aconcagua River, the government together with the WUAs created the Executive Committee, where only the WUAs have a vote, but private and public stakeholders participate in the process of negotiating water use agreements. Grounded on thematic coding of the detailed minutes of over 80 committee meetings since its inception, we examine the workings of a new local model of Assisted Network Governance (ANG). Based on content and social network analysis of over 1,000 directed interactions among committee members, we find that ANG, as an element of broader hybrid governance, has not only produced viable agreements for immediate water redistribution, but has also facilitated longer-term system improvements by building mutual understanding, resolving conflicts, and mobilizing external resources to improve infrastructure. We conclude that ANG helps accomplish common objectives in the field of natural resources under conditions of extreme water scarcity.     

Towards economic geographies beyond the Nature-Society divide

This article suggests an approach to economic-geographic quantification that is relevant to engaging the socionatural blurring of an Anthropocene. It develops representations of commodities and of economies that draw upon concepts of absolute, relative, and relational space to help move beyond legacies of the Nature-Society divide in economic-geographic thought. To supplement familiar ways of knowing commodities as bounded objects with associated single values (prices), the piece rereads input-output approaches, providing accounts of how commodities enfold relations among socionatural phenomena. It quantifies and maps the activities and flows of the global economy in 2007 in terms of their embodied carbon emissions, labor times, and harvested land areas alongside their monetary values. Comparing the perspectives that result, it identifies empirical and theoretical challenges that a political-industrial ecology could help address.     

Integrated Storage and Querying of Spatially Varying Data Quality Information in a Relational Spatial Database

This article investigates a new, integrated technique for storing and retrieving spatially varying data quality information in a relational spatial database. Rather than storing global data quality statements, the system enables data quality information to be referenced to a spatial framework, individual spatial objects, or even parts of spatial objects. The integrated model, called as RDBMS for Spatial Variation in Quality (RSVQ), allows flexible storage of spatially varying data quality information, and seamless querying irrespective of the underlying storage model. RSVQ is founded on a formal model of relational databases, defining a new derived, polymorphic query operator      to join quality data with spatial data. The      operator is implemented in an extension to SQL as a new WITHQUALITY keyword. A performance evaluation of RSVQ was conducted, using an Oracle Spatial database and a case study of cadastral data for parts of Victoria, Australia. The results of this evaluation demonstrated that the system is practical and efficient for a wide range of queries, as well as indicating the performance trade-offs associated with the different data quality storage models. Using the integrated RSVQ approach provides the potential for a single, consistent, database engine for a wide range of existing and proposed spatial data quality management systems.     

DEVELOPMENT OF A LOW-COST MOBILE MAPPING SYSTEM: A SOUTH AMERICAN EXPERIENCE

This paper presents the prototype of a low-cost terrestrial mobile mapping system (MMS) composed of a van, two digital video cameras, two GPS receivers, a notebook computer, and a sound frame synchronisation system. The imaging sensors are mounted as a stereo video camera on top of the vehicle together with the GPS antennae. The GPS receivers and the notebook computer are configured to record data referred to the vehicle position at a planned time interval. This position is subsequently transferred to the road images. This set of equipment and methods provide the opportunity to merge distinct techniques to make topographic maps and also to build georeferenced road image databases. Both vector maps and raster image databases, when integrated appropriately, can give spatial researchers and engineers a new technique whose application may realise better planning and analysis related to the road environment. The experimental results proved that the MMS developed at the São Paulo State University is an effective approach to inspecting road pavements, to map road marks and traffic signs, electric power poles, telephone booths, drain pipes, and many other applications important to people's safety and welfare. A small number of road images have already been captured by the prototype as a consequence of its application in distinct projects. An efficient organisation of those images and the prompt access to them justify the need for building a georeferenced image database. By expanding it, both at the hardware and software levels, it is possible for engineers to analyse the entire road environment on their office computers.     

城市空间数据库动态更新机制研究与实现

针对长期困扰城市空间数据库建设的“更新冲突”问题进行了深入分析,提出了基于对象特征的数据动态更新机制,并完成了系统的设计与开发。实验证明：该系统可以满足城市空间数据库动态更新的需要。     

地学空间数据库建库工艺流程简介

通过承担福建省不同比例尺地质图空间库建设的实践，总结了地质图空间数据库建设的工艺流程，方法及技巧，对今后地学空间数据库的建设具有重要的借鉴意义。     

Development of a GIS-based monitoring and management system for underground coal mining safety

Coal mine safety is of paramount concern to mining industry. Mine accidents have various causes and consequences including catastrophic failure of mine, substantial economic losses and most notably loss of lives. Therefore, any initiative in mine monitoring is of vital importance for progressing safety surveillance and maintenance.This paper presents the development of a geographic information system (GIS)-based monitoring and management system for underground mine safety in three levels as constructive safety, surveillance and maintenance, and emergency. The developed model integrates the database design and management to the monitoring system implementation which encompasses query and analysis operations with the help of web and desktop applications. Interactive object-oriented graphical user interfaces (GUIs) were developed to visualize information about the entities gathered from the model and also to provide analysis operations based on the graphical representations and demonstrations using data tables and map objects.The research methodology essentially encompasses five main stages: (i) designing a conceptual database model; (ii) development of a logical model in terms of entity-relationship (ER) diagrams; (iii) development of a physical model based on physical constraints and requirements; (iv) development of GUIs and implementation of the developed model, analysis and queries; (v) verification and validation of the created model for Ömerler underground coal mine in Turkey. The proposed system is expected to be an efficient tool for improving and maintaining healthy standards in underground coal mines which can possibly be extended to a national GIS infrastructure.