共查询到20条相似文献，搜索用时 78 毫秒
1.
为保证高层建筑物的正常使用寿命和建筑物的安全性,在对其施工中,根据施工进度必须按规定对其进行沉降观测。本文对高层建筑的沉降原因、观测精度和频率的确定、基准网点及观测点布设、观测方法等方面进行了讨论,并根据观测实例进行变形分析。 相似文献
2.
3.
4.
多角度观测系统用于地面遥感实验中测量地物的双向反射特性。配合高光谱分辨率遥感卫星影像,可以反演得到地物的三维结构信息。多角度观测系统的几何精度直接影响到观测地物的范围及采集数据的准确性。对其进行评估,不仅为实验人员选择实验设备提供精度参数,而且有助于实验人员确定观测范围。以激光脚点最小包络圆半径作为评估参数,提供了一种评估多角度观测系统几何精度的方法;对自主研发的多角度观测系统的几何精度进行了计算与评估。对不同光谱仪视场下的理论观测范围与考虑系统几何精度后的实际观测范围进行了计算,并给出了参考。 相似文献
5.
一种GNSS区域站观测数据质量检测方法 总被引：2，自引：0，他引：2
经过多年观测与积累,GNSS站数据已形成大数据规模,面对大区域、多年GNSS观测数据,需研究数据质量检测方法,形成快速、常态化检测机制,为GNSS站观测数据快速提取与推广应用提供质量保障。本文提出了一种基于TEQC技术的GNSS区域站观测数据质量检测方法,分析了检测内容、检测方法及方法关键点;以大华北区域660余个站点10期观测数据为研究对象,采用所提出的方法,对其进行质量检测,并对检测结果进行了分析;通过实地考察站址观测环境,分析了误差超限的原因,从而修订了观测工艺流程;基于研究成果构建了适用于大规模GNSS站观测数据质量检测技术体系,可为全国GNSS站观测数据质量检测提供方法参考。 相似文献
6.
作者就某办公楼发生倾斜及裂缝后 ,对其进行建筑物变形观测这一实例 ,就其观测方法和建筑物发生变形的原因进行了总结及分析 ,并提出了治理的对策 ,为该建筑物维修方案的制定提供了依据。 相似文献
7.
8.
结合传输型对地观测小卫星一体化设计的特点,介绍了一种用于对地观测小卫星系统的锁相接收机的构成及原理,并对系统的相位噪声性能进行了详尽的分析,提出了对其相位噪声进行技术控制的方法.通过文中的分析与研究,消除了由于对地观测小卫星相位噪声所引起的系统误码率的恶化,提高了系统的可靠性,为下一步对地观测小卫星的发展与应用打下了良好的技术基础. 相似文献
9.
随着全站仪的更新换代,全站仪三角高程的测量精度不断提高,其应用领域在不断地扩大和深化。本文着重对单向观测法、对向观测法、中间设站法等三种三角高程测量观测方法进行论述和精度分析,对主要误差来源进行综述,并对其应用领域进行了总结,得到了一些有益的结论。 相似文献
10.
11.
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
12.
13.
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
14.
15.
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
16.
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
17.
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
18.
“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
19.
《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
20.
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