Innovative Germicidal UV and Photocatalytic System Dedicated to Aircraft Cabin Eliminates Volatile Organic Compounds and Pathogenic Micro‐Organisms          下载免费PDF全文

Laurent Gorvel  Matthieu Yver  Evelyne Robert  Michel Harmant  Manuel Rosa‐Calatrava  Bruno Lina  Jean Pierre Gorvel  Vincent Moulès  Raphaël Albalate  Carole Gaüzère 《洁净——土壤、空气、水》2014,42(6):703-712

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李峰  崔希民  袁德宝  王果  张玲 《大地测量与地球动力学》2012,32(5):128-132

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激光雷达测量技术在地学中的若干应用   总被引：3，自引：0，他引：3  

马洪超 《地球科学》2011,36(2):347-354

对激光雷达测量技术在全球冰川监测、局部断裂带提取、滑坡监测和稳定性评价以及海岸线提取和海岸侵蚀等方面的应用做了较为全面的综述.作为一种新型的对地观测手段,激光雷达(含星载、机载、车载和地面)的应用已经从传统的测绘扩大到包括文物保护在内的诸多其他应用领域.所综述的激光雷达技术在地学研究中的4个应用方面,是传统地学研究中与全球变化和人居环境最为密切的方向.分析表明,激光雷达技术在这些研究方向中的应用大有作为.   相似文献   

Automated landslide mapping using spectral analysis and high-resolution topographic data: Puget Sound lowlands, Washington, and Portland Hills, Oregon   总被引：4，自引：0，他引：4  

Adam M. Booth  Josh J. Roering  J. Taylor Perron   《Geomorphology》2009,109(3-4):132-147

Landslide inventory maps are necessary for assessing landslide hazards and addressing the role slope stability plays in landscape evolution over geologic timescales. However, landslide inventory maps produced with traditional methods — aerial photograph interpretation, topographic map analysis, and field inspection — are often subjective and incomplete. The increasing availability of high-resolution topographic data acquired via airborne Light Detection and Ranging (LiDAR) over broad swaths of terrain invites new, automated landslide mapping procedures. We present two methods of spectral analysis that utilize LiDAR-derived digital elevation models of the Puget Sound lowlands, Washington, and the Tualatin Mountains, Oregon, to quantify and automatically map the topographic signatures of deep-seated landslides. Power spectra produced using the two-dimensional discrete Fourier transform and the two-dimensional continuous wavelet transform identify the characteristic spatial frequencies of deep-seated landslide morphologic features such as hummocky topography, scarps, and displaced blocks of material. Spatial patterns in the amount of spectral power concentrated in these characteristic frequency bands highlight past slope instabilities and allow the delineation of landslide terrain. When calibrated by comparison with detailed, independently compiled landslide inventory maps, our algorithms correctly classify an average of 82% of the terrain in our five study areas. Spectral analysis also allows the creation of dominant wavelength maps, which prove useful in analyzing meter-scale topographic expressions of landslide mechanics, past landslide activity, and landslide-modifying geomorphic processes. These results suggest that our automated landslide mapping methods can create accurate landslide maps and serve as effective, objective, and efficient tools for digital terrain analysis.  相似文献   

一种基于机载LiDAR和离散曲率的建筑物三维重建方法   总被引：3，自引：1，他引：2  

王植  李清泉 《地理与地理信息科学》2009,25(1)

机载LiDAR作为一种获取地物空间信息的新技术已得到广泛应用,但从LiDAR数据中重建建筑物三维模型方法的缺乏,是制约其进一步发展的瓶颈.该文介绍了一种自动与人机交互建模相结合的建筑物三维重建方法,首先基于离散曲率分析自动提取建筑物3D轮廓信息,然后将建筑物轮廓信息作为约束条件,使用模型驱动的ATOP算法实现建筑物自动建模,并支持对复杂建筑物人机交互建模.  相似文献   

航空瞬变电磁法对地下典型目标体的探测能力研究   总被引：2，自引：2，他引：0       下载免费PDF全文

殷长春  任秀艳  刘云鹤  蔡晶 《地球物理学报》2015,58(9):3370-3379

航空电磁法的探测能力受飞行高度、发射波形、发射磁矩和发射基频等因素的影响,致使不同分量间的勘探能力存在差异.航空电磁如对所有磁场和磁感应分量、on-和off-time数据进行观测和解释,不仅数据量大、耗时长,而且出现大量冗余数据.目前国内针对此问题尚无系统解决方法.本文针对吊舱式直升机航空电磁系统,采用积分方程法求解频率域响应,经汉克尔变换转换到时间域,计算了地下三维目标体的B和dB/dt时间域响应.利用异常体响应与背景场响应作比值,并通过设定响应阀值定义最大勘探深度,进而分析不同发射波形、不同分量以及on-和off-time期间的航空电磁系统的探测能力.基于本文分析手段,可根据实际勘探目标,确定一套探测能力较强的航空电磁最佳参数组合,为野外测量和数据处理提供技术指导,高效完成勘探任务.  相似文献   

Sharp spatially constrained inversion with applications to transient electromagnetic data   总被引：1，自引：0，他引：1       下载免费PDF全文

Gianluca Fiandaca  Anders Vest Christiansen  Casper Kirkegaard  Esben Auken 《Geophysical Prospecting》2015,63(1):243-255

Time‐domain electromagnetic data are conveniently inverted by using smoothly varying 1D models with fixed vertical discretization. The vertical smoothness of the obtained models stems from the application of Occam‐type regularization constraints, which are meant to address the ill‐posedness of the problem. An important side effect of such regularization, however, is that horizontal layer boundaries can no longer be accurately reproduced as the model is required to be smooth. This issue can be overcome by inverting for fewer layers with variable thicknesses; nevertheless, to decide on a particular and constant number of layers for the parameterization of a large survey inversion can be equally problematic. Here, we present a focusing regularization technique to obtain the best of both methodologies. The new focusing approach allows for accurate reconstruction of resistivity distributions using a fixed vertical discretization while preserving the capability to reproduce horizontal boundaries. The formulation is flexible and can be coupled with traditional lateral/spatial smoothness constraints in order to resolve interfaces in stratified soils with no additional hypothesis about the number of layers. The method relies on minimizing the number of layers of non‐vanishing resistivity gradient, instead of minimizing the norm of the model variation itself. This approach ensures that the results are consistent with the measured data while favouring, at the same time, the retrieval of horizontal abrupt changes. In addition, the focusing regularization can also be applied in the horizontal direction in order to promote the reconstruction of lateral boundaries such as faults. We present the theoretical framework of our regularization methodology and illustrate its capabilities by means of both synthetic and field data sets. We further demonstrate how the concept has been integrated in our existing spatially constrained inversion formalism and show its application to large‐scale time‐domain electromagnetic data inversions.  相似文献   

激光雷达(LiDAR):获取高精度古地震探槽信息的一种新技术   总被引：8，自引：4，他引：4  

郑文俊  雷启云  杜鹏  陈涛  任治坤  俞晶星  张宁 《地震地质》2015,37(1)

激光雷达技术是近几十年新发展起来的一种测量技术,已被广泛应用于工程测量、文物保护及地形测量等方面,近几年来活动构造的研究中也已逐步引入。作为活动构造研究的最基础的古地震研究一直还采用传统的地质素描技术进行探槽信息获取,数码照相技术的引入虽然解决了一些问题,但由于照相技术本身的限制,很难克服获取信息的变形和扭曲。激光雷达扫描系统的高信息量、高精度、便捷、安全和易操作等性能,为古地震研究开辟了获取数据信息的新手段和新技术。  相似文献   

新疆阿尔金盘龙沟金矿高光谱蚀变矿物找矿标志研究          下载免费PDF全文

王瑞军  孙永彬  李名松  汪冰  董双发 《地质找矿论丛》2017,32(2):300-311

高光谱遥感技术是近年来兴起并逐渐成熟的蚀变矿物研究方法。盘龙沟金矿床围岩蚀变发育,主要蚀变类型包括硅化、绿泥石化、绢云母化、碳酸盐化、钠长石化、褐铁矿化等,蚀变与金矿化关系密切。文章通过航空高光谱遥感数据和地面光谱数据,提取和诊断盘龙沟金矿床的不同地段、不同地质体的蚀变矿物信息,研究分析金矿区的航空和地面高光谱蚀变矿物、蚀变矿物组合特征,以及矿区围岩蚀变特征,总结航空和地面光谱蚀变矿物分带找矿标志规律,结合金矿床地质矿产特征,系统剖析金矿床的综合找矿标志特征,构建盘龙沟金矿床高光谱蚀变矿物找矿标志;同时依据绢云母、绿泥石的诊断光谱,研究两种蚀变矿物的光谱变化特征,分析了金矿床围岩蚀变的形成条件和蚀变矿物的温压条件,进而初步推测盘龙沟金矿床为中低温热液型金矿,其矿体与围岩形成的环境条件不同。  相似文献   

Absolute airborne gravimetry: a feasibility study     

I. Marson 《Geophysical Prospecting》2012,60(2):361-372

We report here the results obtained during a feasibility study that was pursued in order to evaluate the performances of absolute airborne gravimetry. In contrast to relative systems, which use spring‐type gravimeters, each measurement acquired by absolute systems is independent from the others and the instrument is not suffering from problems like instrumental drift, frequency response of the spring and variation of the calibration factor. After a validation of the dynamic performance of the experimental setup in a moving truck, a comparison between the experimental airborne data retrieved over the Swiss Alps and those obtained by ground upward continuation at flight altitude allow us to state that airborne absolute gravimetry is feasible. The first test flight shows a spatial resolution comparable to those obtained by relative airborne gravimetry. For a wavelength on the order of 12 km the absolute value of gravity can be evaluated with an uncertainty of 6.9 mGal.  相似文献