共查询到20条相似文献，搜索用时 578 毫秒
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介绍了DTM（Digital Terrain Models)的结构，并对TIN(Triangulation of Irregular Network)地形数据进行了分析，提出了一种新的基于TIN地形数据的地形匹配跟踪算法。 相似文献
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平原地区的河网提取一直是基于数字高程模型(DEM)的水系提取的难点。尝试利用主干河流修正不规则三角网(TIN),以提高DEM平原地区地形模拟的精度(基本方法为利用已存在的主干河流线,对其所经区域进行高程赋值,约束TIN的构建,然后进行DEM模拟),基于此进行平原区河网提取。实验表明,此种方法下,平原区提取的主干河流与实际河流有较大的吻合。 相似文献
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近年来,三维地形可视化、三维空间分析已经成为三维地理信息系统领域的前沿问题。为改正传统GIS中面三维将高程坐标仅仅作为附属坐标而导致无法构建地形真三维模型,同时也无法提供地下信息的缺点,基于Unity3D游戏引擎和ArcGIS平台,采用任意地形灰度图为数据源,将灰度图转化ASCII栅格文件读入Unity3D中,最终利用Gameobject中Cube元素,实现了DEM中规则格网模型的真三维展示,利用Gameobject的Mesh元素,采用顺时针索引数组实现了DEM中TIN的真三维展示,由于U3D引擎具有独立的Y坐标(在U3D中高程坐标以Y轴表示)特性,使其能够创建真正意义的真三维模型,同时可以在摄像头上添加镜头旋转脚本以实现模型的360度浏览。 相似文献
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LOD(Levels of Details,细节层次)是解决大规模地形实时渲染的一项关键技术。将LOD应用于三维数字地球中,针对LOD在实时地形绘制、纹理与高程数据映射等方面进行了分析,在采用数据分块、动态LOD技术、动态纹理等技术的基础上实现了海量数据的快速漫游,得到实时显示效果。 相似文献
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针对传统的地形海量数据(基于规则格网数字高程模型)渲染对软硬件需求高、开发周期长、开发难度大等问题,提出了基于Open Scene Graph的解决方案,使海量数据渲染在对硬件需求以及开发难度上都得到了明显的改善。 相似文献
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陈新军 《实验室研究与探索》2007,26(8):153-153
图1上海及临近地区地形分布图长江口及临近海域表层水温分布图(见封面)和上海及临近地区地形分布图(图1)由上海水产大学渔业遥感实验室制作。其海洋遥感数据处理、分析和业务化运行均达到世界同类水平。实验室根据NOAA和MODIS遥感地面接收站获取的实时数据,利用美国NOAACoastwa 相似文献
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以绵阳市为研究区域,采用移动窗口法和均值变点法提取地形起伏度,分析地形起伏度对人口密度、经济密度的影响及其相关性,并与海拔进行对比分析.结果表明：(1)绵阳市中起伏度地形(200～500 m)占比最大,占研究区土地面积33.97%;小起伏度地形(70～200 m)次之,占26.83%;大起伏度地形(500～1 000 m)占18.32%;微起伏度地形(30～70 m)占15.46%;平坦地形(0～30 m)占5.38%、极大起伏度地形(>1 000m)占比最少,占0.4%.(2)地形起伏度对绵阳市人口分布、经济发展的影响强于海拔的影响;地形起伏度对人口分布的影响强于对经济发展的影响,且均呈显著负相关.(3)绵阳市地形起伏度不超过70 m的地区,聚集了26.67%的人口和35.41%的经济总量,但土地面积仅占2.74%,人口和经济活动向平原、台地等地形起伏度较小地区聚集趋势明显. 相似文献
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Automatic target tracking on multi-resolution terrain 总被引：1，自引：0，他引：1
WAN Ming ZHANG Wei MURRAY Marie O. KAUFMAN Ariet 《浙江大学学报(A卷英文版)》2006,7(7):1275-1281
INTRODUCTION In this paper, we propose an automatic target tracking method in our real-time simulation and animation system of large-scale terrain field. Our system supplies autonomous guidance, navigation and control of moving objects, in order to efficiently perform related challenging missions in manufacture, entertainment, and other real-world applications. Our goal is to deploy a large number of moving vehicles upon a large-scale virtual terrain (essentially a 2D curved terrain surfa… 相似文献
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基于Adams-Matlab联合仿真的车辆地面相互作用研究(英文) 总被引：1，自引：0，他引：1
根据多体动力学在Adams环境中建立了某款工程车辆的模型,以汽车地面力学中Bekker承压模型和Jo-nasi剪切模型为基础建立了刚性轮和弹性轮模型以模拟轮胎地面接触,并将轮胎地面接触模型用S函数描述,以提高仿真运行速度和计算精度.最后借助Adams-Matlab联合仿真工具,对车辆与松软地面相互作用问题进行了仿真计算,研究了地面特性对车辆行驶平顺性的影响.仿真计算结果表明,同车辆行驶速度、路面不平度和载荷一样,地面土壤力学特性对车辆行驶平顺性也有重要影响.该联合仿真模型能将地面变形因素考虑到车辆平顺性分析中,为非公路车辆悬架优化设计提供了思路和研究基础. 相似文献
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As indicated by research on the long-term effects of adverse childhood experiences (ACEs), maltreatment has far-reaching consequences for affected children. Effective prevention measures have been elusive, partly due to difficulty in identifying vulnerable children before they are harmed. This study employs Risk Terrain Modeling (RTM), an analysis of the cumulative effect of environmental factors thought to be conducive for child maltreatment, to create a highly accurate prediction model for future substantiated child maltreatment cases in the City of Fort Worth, Texas. The model is superior to commonly used hotspot predictions and more beneficial in aiding prevention efforts in a number of ways: 1) it identifies the highest risk areas for future instances of child maltreatment with improved precision and accuracy; 2) it aids the prioritization of risk-mitigating efforts by informing about the relative importance of the most significant contributing risk factors; 3) since predictions are modeled as a function of easily obtainable data, practitioners do not have to undergo the difficult process of obtaining official child maltreatment data to apply it; 4) the inclusion of a multitude of environmental risk factors creates a more robust model with higher predictive validity; and, 5) the model does not rely on a retrospective examination of past instances of child maltreatment, but adapts predictions to changing environmental conditions. The present study introduces and examines the predictive power of this new tool to aid prevention efforts seeking to improve the safety, health, and wellbeing of vulnerable children. 相似文献
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The aim of this study was to perform computational fluid dynamics (CFD) simulations on the airflows at the Hong Kong International Airport (HKIA). In particular, the effects of hangar buildings and terrain were studied to explore the effects of turbulence on flying aircraft, especially during landing. The CFD simulation showed that significant differences in wind speeds may occur between the north and the south runways on the western part of the HKIA under typhoon conditions with a strong north to northwesterly wind. Simulation also showed that the hanger buildings between the two runways on the western side and the nearby terrain could be causing the observed difference in the wind speeds. The results also indicated that these obstacles could cause significant wind speed variations at the western end of the south runway. This may affect the operation of landing aircraft. The CFD results for a typical typhoon case were analyzed and found to match the wind data recorded by an aircraft landing that day. 相似文献
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Kim Keamy 《Gender and education》2008,20(3):267-279
In this paper, comments made by a group of senior male academics in Australian universities about their leadership behaviours, are considered. Whereas the majority of the men in the study spoke about gender relations, and sometimes feminism in their workplaces, only two of the men engaged in discourses of gender and/or feminism, as well as actively practising and supporting pro‐feminist principles in their workplaces. For a further four men, who even though they utilised gender‐related discourses, there was dissonance with their work practices. It is speculated that fears of feminism, masculinity and of litigation may be possible explanations as to why several of the men grappled with the personal challenges of what it means to be situated in the ‘uncertain terrain’ of publicly espousing support for feminism whilst not wanting to lose their positioning as a male in a patriarchal system. 相似文献
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This historical analysis examines the process of structuring the Korean elementary schooling under the Japanese colonial rule
for the period of 35 years, spanning from 1910 to 1945. Colonial education in Korea was used as an ideological device for
perpetuating the colonization of Korea. But Koreans resisted to such education policy persistently, unlike for the case of
other colonized countries in the same era. The majority of Koreans, including even a small number of pro-Japan people, irrespective
of their social class status, demanded the expansion of elementary education and further took initiatives to raise necessary
funds for it. Here we must realize that the aspiration of Koreans was incompatible with Japanese ruler’s intention. Korean
and Japanese had different ideologies and expectations of establishing Common Schools. Japan’s colonial education resulted
in unintended and unwanted consequences in Korea. 相似文献
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Philip A. Ebert 《Journal of Adventure Education & Outdoor Learning》2019,19(1):84-95
In this article, I explore a Bayesian approach to avalanche decision-making. I motivate this perspective by highlighting a version of the base-rate fallacy and show that a similar pattern applies to decision-making in avalanche-terrain. I then draw out three theoretical lessons from adopting a Bayesian approach and discuss these lessons critically. Lastly, I highlight a number of challenges for avalanche educators when incorporating the Bayesian perspective in their curriculum. 相似文献
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对全地形车的悬挂及转向系统设计,利用SolidWorks软件进行三维建模,运动分析及校核,研究并开发了全地形车稳定可靠的机械结构.该设计结构精确、具有良好的稳定性、快速性,并通过实物样机验证了其科学性、合理性. 相似文献