基于地理国情普查高分辨率遥感影像的道路提取方法研究

在地理国情普查中,道路作为地表覆盖数据的重--素,其提取方法与技术流程成为众多作业单位研究的重点,本文结合作者在地理国情普查中地表覆盖道路提取的经验,对道路的提取方法进行了归纳及总结,并提出了适用于地理国情普查任务中道路提取的方法。希望本文对日后的地理国情普查任务有所帮助。     

增量型编码器结合GPS在道路检测车中的应用

介绍了增量型编码器以及GPS的工作原理及性能参数,阐述了两者在道路检测车中的使用方法和理论依据,得出了两者同时使用能有较高的测量精度的结果,同时也指出了两者的不足,为后续的改进提供参考。     

专注地空 打造中国3S产业新“硅谷”

近年来,随着国家对地理信息产业的重视及一系列相关政策的出台,2013年11月,科技部关于对武汉地理空间信息及应用服务产业集群的批复,让业内对＂国家级地球空间信息产业化基地＂的建设充满了期待。但这一新型的产业聚集模式能否成为众人期望的产业＂新硅谷＂？对于这一发展模式的探索,又能否成为企业发展的驱动力？     

Landscape network approach to assess ecological impacts of road projects on biological conservation

Awareness of the adverse ecological effects of road and other large construction projects has resulted in a rapidly growing demand to quantitatively predict and evaluate the effects on gene flow among plants and animals in natural habitats.In this study,we evaluated the effects of different road construction scenarios on animal species movement by using the methods of ecological landscape connectivity in the typical regions of Yunnan Province,China.The results showed landscape connectivity levels（Probability of Con-nectivity（PC）） decreased after road construction and species with lower dispersal abilities were more affected to the subsequent habitat fragmentation.First level roads affected landscape connectivity most significantly.At a distance of 100 m,the PC index decreased more than 50%.Further analysis suggested that the use of landscape connectivity to assess landscape processes revealed the adverse effects on the species movement more effectively compared with the traditional landscape pattern analysis.In addition,we conducted a graph the-ory and a least-cost modeling discussion,it is obvious that they are powerful tools to represent and analyze landscape networks with respect to related species movement.Network analysis offers a quantitative and simple but effective tool for ecological process assess-ment and biological conservation on large scales.     

坚持自信 破解难题 全面深化改革——学习贯彻习近平总书记系列讲话精神体会

<正>当今中国存在着民主观念淡薄、经济结构粗放、贫富差距巨大、生态环境破坏、文化发展受阻、贪污腐败盛行等问题。基于此,有人唱衰中国,有人诟病民族文化,甚至有人对国家制度产生了怀疑。对于这样那样的问题,首先要充分肯定我们的成绩,再来自信地解决我们的问题。习近平总书记指出,"今天我们的国家治理体系,     

砂袋垫层隔振在城市道路工程中的应用

城市道路工程中车辆行驶引起的振动对周边环境产生不利影响,本文介绍一种砂袋垫层道路隔振方法。通过在道路路基中设置砂袋垫层,减少道路行车振动对沿边建筑物等的环境影响。并介绍了土袋垫层地基处理技术在国外道路工程中的应用实例。     

集成不同类型特征的城市道路选取方法研究

道路选取是进行道路网地图综合及多尺度表达时的基础。现有的道路选取方法大多是以道路的语义特征和几何特征作为道路选取的依据,较少考虑道路的拓扑特征。基于此,该文以城市道路网为例,综合考虑道路的语义特征、几何特征和拓扑特征,并以道路综合性能作为城市道路选取的依据,提出一种城市道路选取的新方法。通过实例分析,验证了该方法的有效性。     

贵阳市金阳开发区道路命名成经典新地名

贵阳市属于西部欠发达地区,特别是南明、云岩两城区面积小、人口密度大、交通复杂、道路拥挤,新建、扩建道路相对很少。而金阳属于贵阳市目前新兴的开发区,此次地名规划区域主要为金阳第二规划控制区,其大致范围为：西起贵阳西北环线,东临川黔铁路,北至龙潭路,南界321国道,规划面积约40平方公里,规划人口约40万人,是金阳建成后的主体部分,将与老城区形成双中心的格局。2008年以来,贵阳市通过博采众长的地名征集和命名活动,极大地丰富了金阳新区道路新地名,展示了贵阳市城市建设新面貌,开创了贵阳市地名命名工作的创新之举。     

抽提前/后成熟页岩对氮气、二氧化碳的吸附特征及其对孔隙研究的意义

选择了成熟度、有机质类型与矿物组成较为接近但有机碳含量(TOC)有明显差异的两个成熟页岩进行了氮气、二氧化碳气体等温吸附分析,并考察了抽提前/后吸附特征的变化,尝试说明影响成熟页岩孔隙发育的主要因素。初步的结果表明,页岩的比表面积主要取决于微孔的发育程度,而孔体积则与大孔的发育程度关系密切;微孔发育程度与页岩的有机碳含量有密切的关系;页岩抽提后对两种气体的吸附量相对于抽提前均显著增加,抽提前/后样品在60°C及110°C干燥等不同前处理方式下获得的氮气等温吸附数据表明,残留沥青对孔隙发育具有明显的制约作用。     

Factors Controlling Low Uranium and Thorium Concentrations in the ?ay?rhan Bituminous Shales (?BS) in the Beypazar? (Ankara) Area, Turkey

In this study uranium and thorium contents and depositional characteristics of ay rhan bituminous shales（ BS）, west of Ankara（central Anatolia）, are investigated. Samples used were collected from boreholes opened by Park Holding Ltd. A total of 25 samples were taken from bituminous shale levels in boreholes drilled at 6 different locations in the study area. The H rka formation which hosts bituminous shale deposits is a volcanosedimentary sequence and all lithofacies indicate that a lacustrine environment where the water level was continuously changed. In addition to hydrocarbon generation potential, bituminous shales also accumulate significant amount of radioactive elements such as uranium and thorium. The average uranium and thorium concentrations of BS（1.83/2.62 ppm） are much lower than averages of UC, NASK and PAAS（uranium： 2.70/2.66/3.10 ppm; thorium： 8.50/12.30/14.60 ppm）. Low uranium contents in comparison to those of similar lacustrine environments might be attributed to that waters of depositional environment of BS contain low concentration of dissolved uranium and redox conditions were of oxic and dioxic character. Correlation data indicate that U and Th have a similar source and are associated predominantly with clays and phosphates and dominantly with organic material. Radioactive elements in the basin might be derived from Paleozoic granites and metamorphites（e.g. gneiss, schist） which comprise the basement and volcanism which was active in the region throughout the Miocene period. These elements are probably associated with uraniferous phosphate minerals（e.g. autunite, torbernite） which occur in granite, gneiss and schist. BS with average TOC content of 10.96 % shows very good/perfect source rock potential. Positive correlations between Gamma-Ray values and U, Th and K concentrations imply that radioactivity might be originated from these three elements.