无标识纸质地图增强现实技术研究与实现

纸质地图因其通用性和全局性特点在地理环境的认知过程中具有重要意义,经过增强现实技术融合将会在信息载负量和可视化维度等方面实现突破。文中简述无标识纸质地图增强现实系统的技术原理,提出一种纸质地图无标识配准方法,归纳总结纸质地图增强现实表达方法及其作用,研究纸质地图人机交互方法,实现无标识纸质地图与增强现实技术的融合,增强传统纸质地图的认知功能。     

Augmented paper maps: Exploring the design space of a mixed reality system

Paper maps and mobile electronic devices have complementary strengths and shortcomings in outdoor use. In many scenarios, like small craft sailing or cross-country trekking, a complete replacement of maps is neither useful nor desirable. Paper maps are fail-safe, relatively cheap, offer superior resolution and provide large scale overview. In uses like open-water sailing it is therefore mandatory to carry adequate maps/charts. GPS based mobile devices, on the other hand, offer useful features like automatic positioning and plotting, real-time information update and dynamic adaptation to user requirements. While paper maps are now commonly used in combination with mobile GPS devices, there is no meaningful integration between the two, and the combined use leads to a number of interaction problems and potential safety issues. In this paper we explore the design space of augmented paper maps in which maps are augmented with additional functionality through a mobile device to achieve a meaningful integration between device and map that combines their respective strengths.     

测绘工程专业毕业设计（论文）选题质量控制

＂指导学生撰写毕业设计（论文）是实现培养目标的重要教学环节,具有不可替代的作用,‘决不能降低要求,更不能放任自流’＂[1]。毕业设计（论文）一般经过选题、过程控制和答辩等几个环节,文章结合我院测绘工程专业多年毕业设计（论文）实际,着手研究选题环节的质量控制,对提高毕业设计（论文）的质量,适应我校应用创新型学生培养方案,...     

现代设计过程的工程制图命题新模式探讨

本文提出一种基于现代设计过程进行工程制图命题的新方法,该方法从三维设计入手构思考题内容,利用三维工程设计软件构建三维模型,然后转化为二维工程图并进一步修改形成试题。该方法缩短了命题时间,减轻了教师命题劳动强度,并适用于地质、测绘等相近专业课程的命题。     

不通过自由纸面时建立时间基准的方法与性能分析

本文提出了一种不通过自由纸面时建立时间基准的方法.核心思想是每台原子钟都分别相对于外参考进行预测和驾驭,这样每台钟都得到一台受外参考驾驭的钟,然后再对这些受驾驭钟进行加权平均,建立时间基准.本方法避免了由于传统方法中单台钟的时差和自由纸面时相互影响而造成的不足,还可以针对每台钟的特性分别优化设计预测算法和驾驭算法.概述...     

对我国2000-2004年发表的“RS”论文的统计分析

本文对近年来国内主要科技期刊上有关“RS”论文进行统计与分析,叙述了近年来我国RS科学研究的现状和水平,揭示了这一学科的应用范围、研究者现状、分布的特点和规律,明确了RS在国民经济建设中的重要地位。对RS的发展阶段给予了评价。     

Carbon dynamics of paper,engineered wood products and bamboo in landfills: evidence from reactor studies

Background

There has been growing interest in the development of waste-specific decay factors for estimation of greenhouse gas emissions from landfills in national greenhouse gas inventories. Although engineered wood products (EWPs) and paper represent a substantial component of the solid waste stream, there is limited information available on their carbon dynamics in landfills. The objective of this study was to determine the extent of carbon loss for EWPs and paper products commonly used in Australia. Experiments were conducted under laboratory conditions designed to simulate optimal anaerobic biodegradation in a landfill.

Results

Methane generation rates over incubations of 307–677 days ranged from zero for medium-density fibreboard (MDF) to 326 mL CH₄ g^?1 for copy paper. Carbon losses for particleboard and MDF ranged from 0.7 to 1.6%, consistent with previous estimates. Carbon loss for the exterior wall panel product (2.8%) was consistent with the expected value for blackbutt, the main wood type used in its manufacture. Carbon loss for bamboo (11.4%) was significantly higher than for EWPs. Carbon losses for the three types of copy paper tested ranged from 72.4 to 82.5%, and were significantly higher than for cardboard (27.3–43.8%). Cardboard that had been buried in landfill for 20 years had a carbon loss of 27.3%—indicating that environmental conditions in the landfill did not support complete decomposition of the available carbon. Thus carbon losses for paper products as measured in bioreactors clearly overestimate those in actual landfills. Carbon losses, as estimated by gas generation, were on average lower than those derived by mass balance. The low carbon loss for particleboard and MDF is consistent with carbon loss for Australian wood types described in previous studies. A factor for carbon loss for combined EWPs and wood in landfills in Australia of 1.3% and for paper of 48% is proposed.

Conclusions

The new suggested combined decay factor for wood and EWPs represents a significant reduction from the current factor used in the Australian greenhouse gas inventory; whereas the suggested decay factor for paper is similar to the current decay factor. Our results improve current understanding of the carbon dynamics of harvested wood products, and allow more refined estimates of methane emissions from landfills.

     

对近6年中国GPS论文的统计分析

对近6年来国内主要科技期刊上发表的有关“GPS”论文进行了统计与分析,基本展示了近6年来我国在GPS方面的研究现状和水平,揭示了这一学科的应用范围、研究者现状、分布的特点和规律,说明了GPS在国民经济建设中的重要地位。对GPS发展阶段的状况给予了评价。     

基于论文中高频关键词的GIS领域研究热点的可视化分析

文中对国内GIS领域研究发展和研究热点进行可视化分析。利用词频统计和共词分析方法,并结合SPSS统计分析工具,以六大测绘期刊2006—2015年学术论文为数据源,分析GIS领域发文规律、高频关键词在时间维度上的分布规律和聚类特点,发现近五年来国内对GIS领域研究在发文数量上呈逐年下降趋势,且近10年间GIS领域主要关注WebGIS相关应用、地理信息服务、地图制图与可视化、数字城市建设及空间关系相关理论技术5个方面的研究,从一定程度上揭示GIS领域的研究热点及发展状况。