基于LiDAR和航空影像的地震灾害倒塌建筑物信息提取   总被引：1，自引：0，他引：1  

于海洋  程钢  张育民  卢小平 《国土资源遥感》2011,(3):77-81

地震灾害损失评估是震后展开救灾工作的重要环节.快速、准确地获取震后损毁建筑物信息能够为灾区减灾、救灾工作提供有效的支持.高分辨率航空遥感是灾害监测的重要技术手段,但其信息自动提取的精度受到一定的限制.近年来新出现的LiDAR技术能够提供地面目标的高程信息,可应用于复杂环境下倒塌建筑物信息的提取.研究中采用航空遥感数据和...  相似文献   

LIDAR数据不规则建筑物的矢量化     

曾静静  卢秀山  王健  范俊甫 《测绘工程》2011,20(4):60-62

基于LIDAR数据的建筑物边界提取可以结合其它遥感数据,也可以单纯利用点云数据.利用单纯激光数据提出一种对不规则建筑物边界判断及矢量化的方法,可以有效识别出边界线的线型,并对各种弧形进行矢量化.  相似文献   

大型建筑物主轴线相关性问题研究     

周志军  戴前伟  刘星  岳仁宾 《测绘科学》2011,36(5):160-161,174

随着现代建筑施工技术的发展,建筑物的结构越来越复杂,对施工测量技术和方法的要求也越来越高.对于大型建筑群,尤其是连体建筑,要保证工程质量,不仅要对各建筑主轴线进行准确定位,还要考虑各主轴线的相关性.本文结合中新城上城项目,提出建筑主轴线相关性研究的一些方法,取得了预期的效果.  相似文献   

基于VR的建筑物仿真与交互技术     

张小萍  薛骏蜂  王君泽  瞿畅 《测绘科学》2011,36(5):162-164,230

在建筑展示中运用先进的虚拟现实技术,可以更好地满足全面生动展示建筑物的要求,使人产生身临其境的感觉.本文以某虚拟小区漫游系统的实现为例,探讨了通过VRML构建建筑模型、背景和辅助场景以及利用VRML与JavaScript通信等技术实现虚拟小区漫游系统丰富的交互功能的方法,为VRML在三维建筑场景的展示、漫游等方面的应用...  相似文献   

Shell model representation as a substitute of LoD3 for 3D modeling in CityGML     

Hongchao Fan  Bo Mao  Jie Shen  Liqiu Meng 《地球空间信息科学学报》2011,14(2):79-84

The OGC standard for 3D city modeling is widely used in an increasing number of applications.It defines five consecutive Levels of Detail(LoD0 to LoD4 with increasing accuracy and structural complexity),in which LoD3 includes all exterior appearances and geometrical details and subsequently requires much storage space.A new LoD is introduced as shell model with the exterior shell of the LoD3 model and the opening objects like windows,doors as well as smaller faade objects are projected onto walls.In this paper,a user survey is presented.The results of this survey show that the shell model can give users almost the same visual impression as the LoD3 model.Furthermroe,algorithms are developed to extract the shell model from LoD3 model.Experiments show that this shell model can reduce up to 90% storage of the original LoD3 model.Therefore,on one hand it can be used as a substitute for a LoD3 model for the visualization on small displays.On the other hand,it can be treated as a sub-level of detail(SLoD3) in CityGML,since it retains almost the same amount of information but requires much less storage space.  相似文献   

机载LiDAR点云数据的建筑物重建研究   总被引：5，自引：2，他引：3  

曾齐红  毛建华  李先华  刘学锋 《武汉大学学报(信息科学版)》2011,(3):321-324,328

提出了利用机载LiDAR点云数据进行复杂平面建筑物重建的方法。首先,将提取出的建筑物点云聚类到不同的平面点集;然后,对各个平面点集进行平面拟合,采用平面相交确定平面边界,并解算出各平面边界角点的三维坐标,从而重建建筑物模型。某区域的机载LiDAR点云数据的实验结果表明,该方法能有效地重建出较复杂的平面建筑物。  相似文献   

工程测量课程建设与能力培养的探索与实践     

孔达  王笑峰  龚文峰  周启朋  马学武 《测绘与空间地理信息》2011,(6):33-35

结合工程测量课程建设,着重从课程体系改革及教材建设,实践教学环节的加强,现代化教学手段的应用等方面阐述了本课程建设的实践与认识。  相似文献   

Detecting forest damage after a low-severity fire using remote sensing at multiple scales     

《International Journal of Applied Earth Observation and Geoinformation》2015

Remote sensing technologies are an ideal platform to examine the extent and impact of fire on the landscape. In this study we assess that capacity of the RapidEye constellation and Landsat (Thematic Mapper and Operational Land Imager to map fine-scale burn attributes for a small, low severity prescribed fire in a dry Western Canadian forest. Estimates of burn severity from field data were collated into a simple burn index and correlated with a selected suite of common spectral vegetation indices. Burn severity classes were then derived to map fire impacts and estimate consumed woody surface fuels (diameter ≥2.6 cm). All correlations between the simple burn index and vegetation indices produced significant results (p < 0.01), but varied substantially in their overall accuracy. Although the Landsat Soil Adjusted Vegetation Index provided the best regression fit (R² = 0.56), results suggested that RapidEye provided much more spatially detailed estimates of tree damage (Soil Adjusted Vegetation Index, R² = 0.51). Consumption estimates of woody surface fuels ranged from 3.38 ± 1.03 Mg ha⁻¹ to 11.73 ± 1.84 Mg ha⁻¹, across four derived severity classes with uncertainties likely a result of changing foliage moisture between the before and after fire images. While not containing spectral information in the short wave infrared, the spatial variability provided by the RapidEye imagery has potential for mapping and monitoring fine scale forest attributes, as well as the potential to resolve fire damage at the individual tree level.  相似文献   

VIV response of a long flexible riser fitted with strakes in uniform and linearly sheared currents     

《Applied Ocean Research》2015

An experimental investigation was conducted on a flexible riser with and without various strake arrangements. The aim of the present work was to further improve the understanding of the response performance of the vortex-induced vibration (VIV) of a riser with helical strakes. Two current profiles, including uniform and linearly sheared flows, were simulated. The uniform current was simulated by towing the riser model in one direction using the towing carriage, and the linearly sheared current was simulated by fixing one end of the riser and using a driven cantilever to traverse a circular arc. Based on the modal superposition method, the displacement responses were obtained from the measured strain. Strakes with different heights and pitches were analysed, and response parameters such as the displacement response and fatigue damage were studied. The results of the bare model test show that the lock-in phenomenon displays multi-order characteristics, and the VIV displacement decreases with an increased order of the lock-in regime. The results of the straked model test indicate that the response characteristics of a bare riser can be quite distinct from those of a riser with helical strakes, and the response performance depends closely on the geometry of the strake configuration.  相似文献   

From adoption to implementation? An academic perspective on Sustainable Fisheries Management in a developing country     

《Marine Policy》2015

Despite the fact that Sustainable Fisheries Management (SFM) has long been proposed internationally, it remains controversial. Practical and successful applications are scarce, especially in developing countries with a recent history of massive overfishing, such as Mexico. Although SFM has been adopted at the highest level of the Mexican legal framework during the last two decades, its successful implementation still faces a series of complex challenges. At present, important changes in the Mexican political regime are at a breaking point, motivating the academic discussion about the national implications of adopting SFM approaches. Through the analysis of a series of deep interviews of key actors, combined with published material, the article illustrates how the fast-track adoption of SFM approaches has fared in a national fisheries context, the current situation being largely dysfunctional with regard to the challenges of SFM. A complicated mixture between unbeaten management and academic vestiges caused the present circumstances of an enhanced but limited fisheries system. The article proposes academic initiatives required to improve the implementation of SFM in Mexico based on an enhanced understanding of domestic historic conditions and challenges.  相似文献