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针对部分在各高校几乎没有开展起来的航空摄影实习项目,导致学生对整个摄影测量的数据处理流程缺乏全面认识的现象,本文结合虚拟现实技术,设计了航空摄影整个空中操作过程的模拟仿真系统,再结合数据手套、立体眼镜等辅助设备进行交互,实现了航空摄影的模拟操作实验。该航空摄影测量模拟系统有助于提高学生的实践和创新能力。 相似文献
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航空摄影测量作为摄影测量学最重要的分支之一,近年来得到了长足的发展。倾斜航空摄影和无人机摄影测量等多种新作业模式的出现,给传统航空摄影测量带来新的挑战的同时也催生出了诸多新的解决方案。此外,人工智能领域计算机视觉技术和深度学习技术中的新理论、新方法不断融入航空摄影测量中,推动航空摄影测量向智能化、自动化方向发展。当代航空摄影测量学已经是多种传感器融合、多种数据采集方式结合、传统摄影测量和人工智能技术交叉的产物。三维重建是航空摄影测量的核心问题之一。本文阐述了当代航空摄影三维重建技术的发展趋势和存在的问题,着重从航空影像的同名连接点自动提取与匹配、区域网平差、密集匹配和单体化建模4个方面对当前的研究现状进行了总结讨论,给出了当前国内外主流的航空影像摄影测量处理框架。 相似文献
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以IMU/DGPS辅助航空摄影测量为研究内容,在系统地总结和阐述IMU/DGPS辅助航空摄影测量的有关原理和方法的基础上,结合南水北调工程建设与管理基础信息建设与应用(一期)项目中的生产实验和工程实践,形成了一套完整的IMU/DGPS辅助航空摄影测量实施方案,并针对应用中的GPS基站布设、检校场和GPS测量等问题进行了探讨和研究。最后,结合项目的成果,分析了IMU/DGPS辅助航空摄影测量技术的优势和不足,并提出该技术使用的建议。 相似文献
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无人机航测应用领域的不断拓展提高了测绘行业对摄影测量课程实践操作的要求,但受限于航空管制、场地限制、天气条件等,绝大部分高校较难落实无人机摄影测量实践教学。为了探索适合普通高等院校摄影测量课程的实验教学模式,本文结合新兴的虚拟仿真无人机航测教学系统,探讨了虚实融合的摄影测量实验教学模式,构建了航空摄影与摄影测量相融合的实验教学方案,为提升学生应用实践技能、解决高等院校摄影测量实践教学在时间和空间上的限制,以及后疫情时代摄影测量实验教学提供了相应的改革措施。 相似文献
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从实际生产角度出发,对有云天气下的航空摄影测量基本要求进行了分析,并对云下摄影和云上摄影的具体要求作出说明,并以Leica ADS80数字推扫式航空摄影仪为例特别阐述云上摄影的条件,对航空摄影测量生产有一定的指导性意义。 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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自动车辆定位导航系统中传感器的误差分析 总被引:1,自引:0,他引:1
对国界定位导航系统中几种常见的辅助传感器所产生的误差进行了分析,导出了不同传感器的误差模型。这些误差模型是估计车辆位置的扩展卡尔曼滤波器的基础,同时也为选择适当的传感器提供了理论根据。 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