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空间信息移动用户应用服务系统中的GIS关键技术介绍

探讨了空间信息移动用户应用服务的产生背景。提出一种基于MAS体系结构的整体解决方案．并探讨了在实现该方案过程中研究的GIS技术与方法,并对空间信息移动用户的服务对GIS发展的影响及趋势进行了展望。在基于MAS体系结构的空间信息移动用户整体解决方案中,从技术产生背景出发,重点介绍了空间信息智能体个体结构与组成,MAS协同服务等理论、方法,并简单阐述了空间信息智能体管理、维护与更新的想法。文章中对GIS关键技术的研究与实现从海量空间信息的检索与智能提取;异种GIS平台间互操作理论、算法、技术、原型;面向2．5G以上通用移动设备（GPRS／CDMA）开发GIS Wap Service;基于SMPP与CMPP通信模块,GSM通用移动用户的语音／短消息上下行;基于Spatial—Info Agent与MAS体系的开放式空间信息服务系统技术集成等5个方面进行了介绍。     

Three-dimensional reconstruction of fluvial surface sedimentology and topography using personal mobile laser scanning

High-resolution quantification of fluvial topography has been enabled by a number of geomatics technologies. Hyperscale surveys with spatial extents of <1 km² have been widely demonstrated by means of terrestrial laser scanning (TLS) and structure-from-motion (SfM) photogrammetry. Recent advances in the development and integration of global navigation satellite system (GNSS), inertial measurement unit (IMU) and lightweight laser scanning technologies are now resulting in the emergence of personal mobile laser scanners (MLS) that have the potential to increase data acquisition and processing rates by one to two orders of magnitude compared to TLS/SfM, and thus challenge the recent dominance of these technologies. This investigation compares a personal MLS survey using a Leica Pegasus Backpack that integrates Velodyne Puck VLP-16 sensors, and a multi-station static TLS survey using a Riegl VZ-1000 scanner, to produce digital elevation models (DEMs) and surface sedimentology maps. The assessment is undertaken on a 500 m long reach of the braided River Feshie. Comparison to 107 independent real-time kinematic (RTK)-GNSS check points resulted in similar mean error (ME) and standard deviation error (SDE) for TLS (ME = −0.025 m; SDE = 0.038 m) and personal MLS (ME = −0.014 m; SDE = 0.019 m). Direct cloud-to-cloud (C2C) comparison between a sample of TLS and personal MLS observations (2.8 million points) revealed that C2C distances follow a sharply decreasing Burr distribution (a = 2.35, b = 3.19, rate parameter s = 9.53). Empirical relationships between sub-metre topographic variability and median sediment grain size (10–100 mm) demonstrate that surface roughness from personal MLS can be used to map median grain size. Differences between TLS and personal MLS empirical relationships suggest such relationships are dependent on survey technique. Personal MLS offers distinct logistical advantages over SfM photogrammetry and TLS for particular survey situations and is likely to become a widely applied technique. © 2019 John Wiley & Sons, Ltd.     

兴蒙造山带正 （ Nd，t）值花岗岩的成因和大陆地壳生长

“野外地质掌中宝”系统是以WindowsCE为软件平台 ,以掌上电脑为硬件载体 ,适用于野外地质勘探和国土资源调查的便携式工作平台。它包括前端工具软件包、后台伺服处理子系统、通讯子系统以及硬件接口软件等。该系统的开发研究将是以信息高新技术改造传统的野外地质勘探和国土资源调查技术的一次重要实践 ,它的研制成功将为野外地质工作者提供面向2 1世纪的高效、实用、方便的现代化工作平台     

五桂山北麓断裂的重磁资料解释

通过对重力和航磁资料的处理,确认了五桂山北麓断裂的存在。在中山市城区等重点地段得到的地质、钻探、物探、形变与流动重力测量等资料也证实该断裂为一深大断裂,并且第四纪以来还具有一定的活动性。     

移动地图的自适应模型研究

作为一种新的电子地图应用模式,移动地图的制图模型和应用模式都不同于其他类型的地图。在分析移动地图特点的基础上给出移动地图自适应要素的数据模型与组件结构,将自适应要素划分为时空要素、操作要素、技术要素、信息要素、用户要素以及使用环境要素等。移动地图自适应模型的研究可以指导移动地图的设计,实现其服务的个性化和智能化。     

刘鸿允教授的《中国古地理图》和他对古地理学的贡献

刘鸿允教授的代表作《中国古地理图》自1955年正式出版至今已43年。虽然在其后,随着我国地质工作向纵深的发展,在系统性、科学性、准确性等方面都有很大改进的古地理图     

Globalisation, information technology and the emergence of niche transnational cities: the growth of the call centre sector in Dublin

The development of information and communications technologies (ICT) has facilitated the emergence of a complex global urban system in which many formerly lower-order cities have been carving out “niche” specialist functions serving urban fields of transnational dimension. This is illustrated in the case of Dublin, which in recent years has been transcending its traditional role as Ireland’s national metropolis through the development of a range of functions servicing mainly European markets. One such function comprises pan-European telephone call centre operations. The development and characteristics of this newly-emerging sector are described. It is argued that the growth of the sector confirms Dublin’s — and Ireland’s — dependent position in the international division of labour, and that its long-term sustainability is open to question.     

移动Agent结构化安全机制的研究

分析了移动 Agent的安全问题和现有的 Agent安全保护技术 ,从重构移动 Agent的结构入手 ,提出了将 Agent的安全机制从功能体中分离出来独立实现 ,从而构建 1种新的移动 Agent的结构化安全机制的方法 ,并对此进行了阐述