期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
世界上第一个跨运车自动定位装置
1
作者 丁力 《集装箱化》 1996年第2期38-38,共1页
德国汉堡港的码头经营者汉堡港仓储公司(HHLA),最近在世界上率先引入了跨运车自动定位装置,设置于波查特卡集装箱码头。由此,该港集装箱码头的处理能力将显著提高。
关键词 跨运车 自动定位装置 集装箱码头 差分全球定位系统 激光/雷达系统
下载PDF
Estimating underground mine ventilation friction factors from low density 3D data acquired by a moving LiDAR 被引量:6
2
作者 Curtis Watson Joshua Marshall 《International Journal of Mining Science and Technology》 EI CSCD 2018年第4期650-655,共6页
Ventilation system analysis for underground mines has remained mostly unchanged since the Atkinson method was made popular by Mc Elroy in 1935. Data available to ventilation technicians and engineers is typically limi... Ventilation system analysis for underground mines has remained mostly unchanged since the Atkinson method was made popular by Mc Elroy in 1935. Data available to ventilation technicians and engineers is typically limited to the quantity of air moving through any given heading. Because computer-aided modelling, simulation, and ventilation system design tools have improved, it is now important to ensure that developed models have the most accurate information possible. This paper presents a new technique for estimating underground drift friction factors that works by processing 3 D point cloud data obtained by using a mobile Li DAR. Presented are field results that compare the proposed approach with previously published algorithms, as well as with manually acquired measurements. 展开更多
关键词 Mine ventilation Mine design Mobile mapping Roughness estimation Friction factors LiDAR3D point clouds
下载PDF
Estimation of the Volume of Coarse Woody Debris in Eucalyptus Forest using LiDAR Derived Forest Structure Variables 被引量:1
3
作者 Naoko Miura Susumu Goto Simon Jones 《Journal of Environmental Science and Engineering(B)》 2013年第8期501-506,共6页
CWD (coarse woody debris) plays an important role in nutrient cycling, habitat for species and more recently carbon accounting in forest ecosystems. LiDAR (light detection and ranging) technology has demonstrated ... CWD (coarse woody debris) plays an important role in nutrient cycling, habitat for species and more recently carbon accounting in forest ecosystems. LiDAR (light detection and ranging) technology has demonstrated utility in capturing forest structure information. This paper proposes an indirect method of assessing downed CWD using LiDAR derived forest structure variables. Fieldwork was conducted to measure CWD volume in an Eucalyptus forest in Tasmania. A GLM (generalized linear model) to statistically estimate CWD volume in the Eucalyptus forest was developed using a LiDAR derived FCS (forest characterisation scheme): the openings above the ground, low and medium vegetation, canopy cover, presence of understorey and mid-storey vegetation and high trees, and the vertical canopy density of high trees. Five structural variables were selected for the best model based on AIC (Akaike's Information Criterion) by stepwise selection. The applicability of the model was then compared to the outcome of model using field derived variables such as diameter at breast height of trees. The results show that the model using LiDAR derived variables better estimated the amount of CWD. It is concluded that LiDAR derived forest structural variables has the potential to predict the amount of downed CWD in Eucalyptus forest. 展开更多
关键词 CWD (Coarse woody debris) LiDAR (light detection and ranging) FOREST generalized liner model.
下载PDF
The San Juan Islands Thrust System: New Perspectives from LIDAR and Sonar Imagery
4
作者 Don J. Easterbrook 《Journal of Earth Science and Engineering》 2015年第1期1-26,共26页
New LIDAR (Light Detection and Ranging) and sonar imagery have revealed remarkable geomorphic details never seen before and not visible by any other means. Numerous faults and other geologic structures are plainly v... New LIDAR (Light Detection and Ranging) and sonar imagery have revealed remarkable geomorphic details never seen before and not visible by any other means. Numerous faults and other geologic structures are plainly visible on LIDAR and sonar images. Many previously unknown faults criss-cross the islands and large fault scarps are visible on sonar imagery along the margins of the larger islands. Sonar images of sea floor morphology show many submerged faults as long linear scarps with relief up to 300m (1,000 fl), some of which visibly truncate geologic structures. The San Juan Lopez fault, the largest fault in the islands, extends for at least 65 km (40 mi) from Stuart Island to Rosario strait with a scarp up to 330m (1,000 it) high. Since 1975, the basic structural framework of the San Juan Islands has been considered to consist of five stacked thrust faults, the Rosario, Orcas, Haro, Lopez, and Buck Bay faults, constituting the San Juan Thrust (Nappe) System that has shuffled together far distant terranes. However, the new LIDAR and sonar imagery shows that most of the mapped extent of these postulated faults are actually segments of high angle, dipslip faults and are not thrust faults at all. Thus, the San Juan Thrust (Nappe) System does not exist. The age of these faults is not accurately known and more than one period of high angle faulting may have occurred. Faults shown on L1DAR images of the surface of the islands appear as visible gashes, etched out by erosion of fault zones with few fault scarps. However, the sea floor faults have bold relief and high scarps. A late Pleistocene moraine lies undisturbed across the San Juan Lopez fault. 展开更多
关键词 San Juan Thrust System San Juan Islands LIDAR SONAR faults.
下载PDF
A kind of denoising method for airborne waveform sampling LiDAR
5
作者 董志伟 张瑞环 +3 位作者 孙立羽 陈兆东 樊荣伟 陈德应 《Optoelectronics Letters》 EI 2017年第5期397-400,共4页
This paper describes a full waveform sampling LiDAR system applying stripe principle. A kind of denoising method based on edge detection of original stripe signal is proposed. This method is compared with other denois... This paper describes a full waveform sampling LiDAR system applying stripe principle. A kind of denoising method based on edge detection of original stripe signal is proposed. This method is compared with other denoising methods, such as Wiener filtering, mean filtering and median filtering. It is found that the proposed denoising method is much more effective for dealing with the waveform signals. 展开更多
关键词 Edge detection Optical radar
原文传递
Joint observation results of Na layer and ionosphere in Wuhan during the Total Solar Eclipse 被引量:1
6
作者 CHENG XueWu YANG Yong +10 位作者 WANG ZeLong LI FaQuan YANG GuoTao ZHAO ZhengYu GONG Wei WANG JiHong HU Xiong LIN Xin WU XiaoCheng SONG ShaLei GONG ShunSheng 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第2期418-424,共7页
During the total solar eclipse on July 22, 2009 in Wuhan, the joint observation test of Na layer and ionosphere was conducted by using the daytime observation atmospheric lidar and the GPS ionosphere detector. The res... During the total solar eclipse on July 22, 2009 in Wuhan, the joint observation test of Na layer and ionosphere was conducted by using the daytime observation atmospheric lidar and the GPS ionosphere detector. The results show that the full width at half maximum(FWHM) of Na layer density slightly narrowed during the total solar eclipse and broadened after the eclipse, while the height of Na peak slightly decreased in the eclipse and increased after the eclipse. These implying that Na layer changes reflect the rapid process of sunrise and sunset. The ionosphere total electron content(TEC) and the sky background light noise also presented an obvious fluctuation characteristic with the changes of solar irradiation during the process of total solar eclipse. The difference lies in that the changes of FWHM of Na layer atoms are much slower than that of ionosphere, the reason for this might be that the Na layer, after being disturbed by the total solar eclipse, will generate a series of complicated photochemical reactions and momentum transport processes, and then recombine the Na atoms. The Na atoms to be detected by the lidar need a lag process, which rightly conforms to the theoretical simulated results. 展开更多
关键词 Total solar eclipse LIDAR Na layer IONOSPHERE TEC
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部