共查询到20条相似文献，搜索用时 55 毫秒
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陆建华胡大贺吕志才王斌 《现代测绘》2017,(1):43-47
较之传统手工测量技术,三维激光扫描技术具有高精度、高效、高密度数据获取的优势,是古建筑精密三维数据采集的重要手段。分析了三维激光扫描数据采集的几种不同方法,结合工作经验,对大型古建筑精密三维数据采集的特点进行详细阐述,并对作业流程中的扫描方法选择、扫描站点布设、数据存储与管理等关键问题进行探讨,同时给出一些参考建议。在虎丘塔扫描工程实践中,通过调整仪器架设方法、监测风速影响及运用远程操控设备等多种措施,保证了数据采集的精度。经过点云赋色、点云拼接、点云去噪等内业处理后,获取了塔身完整的点云模型,利用高精度全站仪TM50进行精度检核,结果表明,点云模型的整体精度为±11.2mm。 相似文献
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杨飞飞 《测绘与空间地理信息》2022,(2):103-106
随着智慧城市建设发展需求的不断扩大,移动扫描技术在项目应用中的频率不断提升,车载三维激光扫描技术以其高效率、高精度的特点已在项目实践中占有一席之地.但车载三维激光扫描技术受限于卫星信号等情况影响,点云数据为确保达到高精度,通常需进行远超车载扫描本身工作量的点云精度改善工作,即点云纠正,本文使用多个实例数据,通过对不同纠... 相似文献
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三维激光扫描技术是一种无接触的新型测量技术,能快速获取被摄物体的点云,其精度直接影响了工程项目的应用。通过建立室外标定场,研究不同测量距离和入射角对Z+F IMAGER 5006h三维激光扫描仪测量精度的影响,并结合隧道三维激光扫描案例分析,为制定城市地下工程三维激光扫描方案和扫描作业提供技术参考。 相似文献
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地面三维激光扫描是获取对象表面几何信息的主要方法之一,扫描对象的完整性是三维激光扫描数据获取的基本要求。为解决实际扫描过程中,因作业空间受限等原因引起的扫描死角而导致点云缺失的问题,本文根据平面镜反射光线原理提出了针对非直视区域的普通平面镜辅助激光扫描数据的获取方法。分析了普通平面镜对激光光束传播路径与距离的影响机理,推导了激光扫描经普通平面镜反射像点对应的物点坐标解算方程;顾及激光扫描特性,设计了包含球标靶和普通平面镜的镜面反射系统,阐述了系统构建、系统检校与系统坐标系构建方法;并通过试验验证了本方法的可行性和精度。 相似文献
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异形建筑是城市与生活、艺术与创新的产物,由于其结构复杂、造型多变等原因,给竣工测量工作带来了诸多挑战,采用传统测绘方法作业存在着效率低、困难大、精度难以保证等问题。以南京市溧水市民之家异形建筑竣工测量为研究对象,引入三维激光扫描的作业方法,分别从控制测量、外业扫描、点云处理等方面开展研究,构建出场景的三维点云模型,同时利用全站仪对异形建筑的主要特征点进行坐标采集,与模型坐标对比进行模型精度评定。结果表明,三维激光扫描技术有着效率高、精度可靠、数据完整等优势,可为异形建筑竣工测量提供一定的参考。 相似文献
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采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的
污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体
污染变化曲线,得出污染物浓度随着远离上游而增加。 相似文献
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Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data 总被引：5，自引：0，他引：5
C. Bhuiyan R.P. Singh F.N. Kogan 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):289-302
The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw. 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies. 相似文献
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ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200... 相似文献
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GNSS系统及其技术的发展研究 总被引：3，自引：1，他引：2
阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议. 相似文献
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“4D”技术及其应用 总被引：13，自引：0，他引：13
介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
Abstract Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised. 相似文献
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Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services
Kohei OGAWA Edward VERBREE Sisi ZLATANOVA Naohiko KOHTAKE Yoshiaki OHKAMI 《地球空间信息科学学报》2011,14(2):109-118
Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders. 相似文献
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地理数据库的关系模型及其实现 总被引：1，自引：0，他引：1
本文从以图论观点分析地理实体入手,系统阐述了地理数据库关系模型的设计法和过程。作者于1984年4～9月间在微型机上设计建立了关系型地理数据库的实方验系统(RGDB)。该系统采用了本文提出的关系模型,采用了可动态扩库的子库组合结构,这种结构具有灵活性和提高空间利用率的优点。RGDB含有多种功能的数据操作命令,除了具有一般检索功能外,还能进行“开窗”选取和十分“自由”的映象选取。本文对RGDB系统的主要性能和实现途径作了扼要介绍。 相似文献