共查询到20条相似文献，搜索用时 171 毫秒
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基于小班矢量数据、数字高程模型（DEM），利用地理信息软件实现坡向、坡度、海拔等地形因子科学、高效采集。 相似文献
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为避免传统道路选线带来的不良影响,部分学者开始研究三维虚拟场景中的道路选线设计,该项工作的顺利进行,不仅能及时发现道路选线面临的问题,还能利用科学的方式实现道路评估。基于此,主要阐述三维虚拟场景与道路选项相关概念,说明三维地形建模主要内容,探究三维虚拟场景中的道路选线设计,以期为相关人员提供帮助与参考。 相似文献
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介绍一种利用三坐标测量机和触发式测头采集点云数据,结合相关逆向设计软件进行曲面逆向设计的路线.该路线精度高,适合于回转体零件的曲面逆向设计. 相似文献
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森林资源规划设计调查中地形因子自动提取初探 总被引：1，自引：0，他引：1
吴照柏 《中南林业调查规划》2007,26(3):51-53
研究利用DEM数据对森林资源规划设计调查的小班地形因子进行求算的过程与方法,自动计算的结果符合国家林业局"森林资源规划设计调查主要技术规定"要求;研究结果表明,利用DEM数据进行小班地形因子的自动求算,可以减少工作量,提高工作效率并能保证精度。 相似文献
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结合项目实例,论述了利用GPS卫星定位技术在复杂的林区地形风电道路勘测中发挥的优势。 相似文献
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戎桂凤 《内蒙古林业调查设计》2012,(1):95-97
ArcGlobe是基于全球视野下的三维可视化场景展示平台,广泛应用于涉及地形、地貌等自然地理要素的各种工程规划和设计中,应用卫星遥感数据、数字高程模型(DEM)叠加形成的三维场景,可逼真地显示出地形地貌景观。文章主要介绍了基于ArcGlobe的三维地形可视化在森林公园设计中的应用,并以五台山森林公园为例,论述了应用数据的选择、可视化场景的制作以及森林公园三维景观效果图的特点和制作过程。 相似文献
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Michael Craven 《Scandinavian Journal of Forest Research》2014,29(2):174-182
Airborne Light Detection and Ranging (LiDAR) has become a popular remote sensing technology to create digital terrain models and provide forest inventory information. However, little research has been done to investigate the accuracy of using scanning airborne LiDAR to perform road geomatics tasks common to forest engineering. We used airborne LiDAR to estimate existing forest road characteristics in support of a road assessment under four different canopy conditions. In estimating existing road centerlines, LiDAR data had a vertical root mean squared error (RMSE) of 0.28 m and a horizontal RMSE of 1.21 m. Road grades were estimated to within 1% slope of the value sampled in the field and horizontal curve radii were estimated with an average absolute error of 3.17 m. The results suggest that airborne LiDAR is an acceptable data source to estimate forest road centerlines and grades, but some caution should be used in estimating horizontal curve radii, particularly on sharp curves. 相似文献
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本世纪初前10年,是我国公路建设的高峰期,众多项目纷纷上马,这就要求尽可能提高生产效率,缩短生产周期。在这个大背景下,很多最新的、先进的科研成果都引入和应用到公路设计领域,而数字地形图的广泛应用就是这一趋势的体现。本文通过工程实例,介绍了数字地形图在公路设计方案中的具体应用。 相似文献
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从厦门经济特区发祥地——湖里工业区的发展历程为切入点,以湖里公园南大门为载体,将湖里工业区历史文化和地域文化融入园林景观环境,向游客展示特区发展之路与腾飞精神。从地形处理、地面铺装、雕塑景观及植物景观四个方面来阐述湖里公园南大门的建设。 相似文献
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Jürg Andreas Stückelberger Hans Rudolf Heinimann Edouard Charles Burlet 《European Journal of Forest Research》2006,125(4):377-390
Cost estimation is probably the most decisive factor in the process of computer-aided, preliminary planning for low-volume road networks. However, the cost of construction is normally assumed to be route-independent for a specific project area, resulting in sub-optimal layouts. This is especially true for mountainous terrain and in areas with unstable subsoil. Here, we present a model for more accurately estimating spatial variability in road life-cycle costs, based on terrain surface properties as well as geological properties of the subsoil. This parametric model incorporates four structural components: embankment, retaining structures, pavement, and drainage and stream-crossing structures. It is linked to a geo-database that allows users to derive location-specific parameter values as input. In applying this model, we have demonstrated that variability in costs ranges widely for mountainous areas, with the most expensive construction being approximately five times greater there than on more favorable sites. This variability strongly affects the optimal layout of a road network. First, when location-specific slope gradients are considered, costs are reduced by about 17% from those calculated via currently available engineering practices; when both slope gradient and geotechnical formations are included, those costs are decreased by about 20%. Second, the length of the road network is increased by about 4% and 10% respectively, compared with current practices. 相似文献
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Hans R. Heinimann 《Journal of Forest Research》1998,3(1):1-9
Road spacing on slpes depends on the underlying off-road transportation technology. One major decision in road network planning
is to determine under what terrain conditions ground- or cable based extraction systems should be applied. The present investigation
aims to develop a road spacing model for steep slope conditions and to implement a total cost model for skidder and cableyarder
based road network concepts. The study analyzes transportation and road geometry to specify the relationship between road
density, slope gradient, and road spacing. Production functions for skidder and yarder-systems make it possible to derive
transportation cost as a function of road density and slope gradient. A total cost function integrates road building cost,
harvesting strategy, and production economics to derive optimal road density for the two network concepts. The difference
between the cost levels at optimum road density is an indicator for differentiating cable and skidder-based extraction systems.
The model was implemented as a Visual Basic add-in for Microsoft Excel spreadsheet software. This flexible approach makes
future adaptations and changes very easy due to the modular concept. The validity of the model is limited to the production
functions of the underlying off-road transportation technologies. Future work needs to develop production functions for the
state-of-the-art technologies and to improve the road building cost model. 相似文献
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通过对江苏省宁常高速公路的植物景观进行实地调查,结合宁常高速公路沿线气候、地形地貌、周围环境等特点,从植物学、景观生态学及关学的角度,论述了高速公路植物景观绿化的四大原则,总结了该路段景观绿化的植物种类,分析了宁常高速公路中分带、一般路堤、路基边坡、路堑边坡、互通与枢纽以及服务区的植物景观特点,旨在为高速公路的景观绿化及其植物选择提供科学参考。 相似文献
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In this study, we combined a program to optimize forest road alignments with a method for prediction of surface erosion and
related sediment delivered to streams. Combining the forest road design program with the high-resolution digital elevation
model made it possible to estimate soil sediment based on a standard methodology, because a relatively accurate road prism
could be generated. The combined program properly places and spaces drainage structures based on the Washington State Forest practice board manual. We applied the program to a part of Capitol State Forest in Washington State and optimized horizontal and vertical alignments
while estimating movement of soil sediment from roads to streams. We discussed the effects of road surface materials, near-stream
culvert distance to stream, and out-sloped forest road template on total road costs and soil sediment delivered to streams.
Using lower quality rock surfacing reduced total costs, but the amount of soil sediment from lower quality rock surfacing
was 1.5 times more than that on a higher quality rock traction surface. Therefore, lower quality rock surfacing should not
be used near the stream. The placement of near-stream culverts 15 m upstream and out-sloped road template were examined using
a traction surface on 15-m sections upstream and lower quality rock surfacing on other sections in order to reduce soil sediments
to the stream and total costs. As a result, placing near-stream culverts 15 m upstream and using an out-sloped road template
significantly reduced total road cost and soil sediment. Finally, we optimized horizontal and vertical alignments while limiting
soil sediment to a specified maximum level. The model successfully optimized forest road alignments, which reduced total road
cost as well as soil sediment. 相似文献