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论地下铁道的变形监测 总被引:4,自引:0,他引:4
结合广州地铁一号线变形监测的实际 ,全面论述了地下铁道地面与地下变形测量的内容和方法 ,变形观测周期和频率 ,基准点和变形点的布设方案 ;论证并提出了垂直位移和水平位移变形测量的等级和精度。可供制订地下铁道测量规范和进行地铁变形监测时的参考。 相似文献
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DOM已经越来越广泛的应用在我们的工作和生活中,它可以十分直观的给人们提供影像信息,主要介绍DOM的制作方法,并针对DOM制作过程中容易出现的一些影像变形等质量问题,探索出一种行之有效的处理方法 。 相似文献
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以程潮铁矿为例,从监测点的布设、仪器选择等方面阐述了变形监测的实施方案;并从垂直、水平和深部监测3个方面,详细分析了监测数据,得出一些对矿区后续施工与安保工作有指导性的建议。 相似文献
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使用电子交通旅游图(简称电子地图)结合GPS技术跟踪定位,则能实时地显示道路上车辆的准确方位和运动轨迹的变化,使指挥部门能及时了解情况,并作出决策,同时,电子地图还可满足对有关地理信息,如角度、距离、名称、种类、街道有别等进行查询。 相似文献
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针对古建筑现状模型制作困难、费时费力、模型精度低等问题,该文以古建筑标准构件模型为数据源,提出了一种基于古建筑构件现状多视图引导的三维模型变形算法。首先,选取标准三维模型和现状构件视图同一视角方向的轮廓及其特征线;然后,应用相似三角形方法进行同名点对的提取;最后,应用改进的保刚性变形方法完成轮廓线驱动三维构件模型变形,生成完整的古建筑构件现状三维模型。以古建筑中常见的3种基本构件作为实验数据,应用改进的拉普拉斯变形算法,生成了古建筑构建现状模型,并通过与现有变形算法的对比,验证该文方法的可行性和有效性,为古建筑现状模型快速构建提供了新思路。 相似文献
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Motti Zohar 《制图学和地理信息科学》2013,40(6):532-546
ABSTRACTAt the beginning of the twentieth century, a British mapping team led by Captain S. F. Newcombe surveyed and mapped the Negev region, Sinai, and western Jordan. The map was mainly produced for military use. Consequently, it included a network of branched routes, water supplies and facilities, and topographic contours. This study used this map to examine the development of routes in the Negev region between the beginning of and until the end of the twentieth century. First, the individual sheets comprising the study area were pieced together and the accuracy of the map was evaluated. The accuracy found on the Newcombe map was 0.76 mm on the map scale, equivalent to 100.3 m. Route development during the twentieth century was then evaluated by comparing the routes digitized from the Newcombe map to digitized routes on a late twentieth-century map. The results do not reveal tremendous changes in path, shape, or number of routes. Instead, they merely indicate the natural development in their quality. This Historical GIS-based approach provided a useful technique for analyzing and comparing the line segments extracted from historical and modern maps. The implemented approach may also serve other geographical or historical studies aiming to examine the development of branched networks throughout history. 相似文献
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Climate maps have been widely used for the construction of species distribution models. These maps derive from interpolation of data collected by meteorological stations. The sparse distribution of stations generates maps with coarse spatial resolution that are unable to detect microclimates or areas that can serve as plant or animal refuges. This work proposes a method for downscaling temperature maps using the solar radiation falling upon hillsides as predictor for the influence of relief on local variability. Solar irradiance is estimated from a digital elevation model of the study area using a routine based on analytical hillshading. Some examples of downscaling from 1 km to 25 m spatial resolution are shown. The results are compared with the surface temperature maps from Landsat 8 satellite imagery. 相似文献
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An empirical evaluation of three elevation change symbolization methods along routes in bicycle maps
ABSTRACTElevation change is critical for choosing a route when bicycling. We detail an empirical study in which we comparatively evaluated three linear symbolization types (color hue, color-coded arrows, and elevation profiles) to depict elevation change in bicycle maps for two common bicycle route planning tasks: relative height detection and slope identification. Participants performed most accurately with the color-coded arrows for relative height detection tasks, whereas symbolization did not significantly influence map-use performance for slope identification. Participants preferred the elevation profile, in spite of their lowest performance with this method overall. Our rare empirical findings offer much needed new insights into the function and appropriateness of common elevation symbolization methods, specifically to identify elevation change in bicycle route planning tasks in urban areas where map display real estate is already very limited. 相似文献
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An optimum vehicular path algorithm for traffic network based on hierarchical spatial reasoning 总被引:5,自引:0,他引:5
Human beings' intellection is the characteristic of a distinct hierarchy and can be taken to construct a heuristic in the shortest path algorithms.It is detailed in this paper how to utilize the hierarchical reasoning on the basis of greedy and directional strategy to establish a spatial heuristic,so as to improve running efficiency and suitability of shortest path algorithm for traffic network.The authors divide urban traffic network into three hierarchies and set forward a new node hierarchy division rule to avoid the unreliable solution of shortest path.It is argued that the shortest path,no matter distance shortest or time shortest,is usually not the favorite of drivers in practice.Some factors difficult to expect or quantify influence the drivers' choice greatly.It makes the drivers prefer choosing a less shortest,but more reliable or flexible path to travel on.The presented optimum path algorithm,in addition to the improvement of the running efficiency of shortest path algorithms up to several times,reduces the emergence of those factors,conforms to the intellection characteristic of human beings,and is more easily accepted by drivers.Moreover,it does not require the completeness of networks in the lowest hierarchy and the applicability and fault tolerance of the algorithm have improved.The experiment result shows the advantages of the presented algorithm.The authors argued that the algorithm has great potential application for navigation systems of large-scale traffic networks. 相似文献
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Human beings’ intellection is the characteristic of a distinct hierarchy and can be taken to construct a heuristic in the shortest path algorithms. It is detailed in this paper how to utilize the hierarchical reasoning on the basis of greedy and directional strategy to establish a spatial heuristic, so as to improve running efficiency and suitability of shortest path algorithm for traffic network. The authors divide urban traffic network into three hierarchies and set forward a new node hierarchy division rule to avoid the unreliable solution of shortest path. It is argued that the shortest path, no matter distance shortest or time shortest, is usually not the favorite of drivers in practice. Some factors difficult to expect or quantify influence the drivers’ choice greatly. It makes the drivers prefer choosing a less shortest, but more reliable or flexible path to travel on. The presented optimum path algorithm, in addition to the improvement of the running efficiency of shortest path algorithms up to several times, reduces the emergence of those factors, conforms to the intellection characteristic of human beings, and is more easily accepted by drivers. Moreover, it does not require the completeness of networks in the lowest hierachy and the applicability and fault tolerance of the algorithm have improved. The experiment result shows the advantages of the presented algorithm. The authors argued that the algorithm has great potential application for navigation systems of large-scale traffic networks. 相似文献
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关于微分圆投影变成变形椭圆的分析与研究 总被引:2,自引:1,他引:1
针对各种地图学教材中关于变形椭圆的证明提出了三个问题,通过对地图投影中的微分圆垂直投影或 斜投影分析,不仅证明了微分圆投影变成了变形椭圆,而且利用几何分析解决了各种地图学教材中关于变形椭圆 证明出现的三个问题,对进一步了解地图投影的变形分布规律有着重要的意义。 相似文献
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《The Cartographic journal》2013,50(2):118-136
AbstractAlthough widely known, the inset town plans which appeared on large-scale maps of Great Britain have never been systematically listed and analysed. Inset town plans are discussed in terms of their design and content, and the rare process of revision is illuminated. Particular attention is focussed on the sources of plans and patterns of occurrence and authorship are identified. From this detailed analysis, a picture of their strengths and weaknesses for the urban historian is developed. 相似文献