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由国家级测绘仪器计量检测技术机构——国家光电测距仪检测中心独立承担并完成的科技部2005年科学仪器设备升级改造“大长度实验室检测平台自动化”项目,日前荣获2008年国家测绘科技进步二等奖。项目首次在国内实现了全站仪和测距仪等室内长度项目检测过程中的反射棱镜移动置镜、观测和数据记录、位移基准值和环境温度实时采集和多源数据处理等一体化全自动检测作业。 相似文献
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师郡 《测绘与空间地理信息》2000,23(2):38-39
文章提出的方法近似于平台法,但又有不同,不需要设置专用平台、检测可在室内进行,因此一般的测绘单位都可自己定期对测距仪进行检定,并且由于消除了外界因素的影响,使得检定结果更为可靠。 相似文献
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文章提出的方法近似于平台法,但又有不同,不需要设置专用平台,检测可在室内进行,因此一般的测绘单位都可自己定期对测距仪进行检定,并且由于消险了外界因素的影响,使得检定结果更为可靠。 相似文献
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针对人们室内活动增多对室内位置智能化服务需求迫切的问题,该文简要阐述了主要的室内定位技术,搭建了室内位置服务云平台,并研发了终端大众位置服务软件.在云计算平台和Android平台分别提供了地图浏览与查询、定位导航、信息交互、用户管理等服务.通过蓝牙校正行人航迹推算的混合室内定位,开展了位置联动、位置感知、位置搜索等智能化位置应用研究.提供了位置信息智慧化服务模式,支撑了大众位置服务中所需的找到走失的人、找回车位、寻找和访问店铺等工作,将为推进室内定位技术应用、扩宽智慧化位置服务领域形成有益参考. 相似文献
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地磁室内定位基准图数据采集系统设计 总被引：4，自引：1，他引：3
近年来,地磁作为室内定位基准已经成为热点研究领域。本文深入研究了地磁室内定位技术,并通过大量试验,分析了室内磁性材料及电子设备对磁场的干扰,进一步探究了室内磁场特性,证明了磁场信息作为定位依据的可行性;利用Arduino IDE研发了智能地磁数据采集平台,该平台搭载多种传感器,如HMC5983磁传感器和惯性导航传感器等,采集一定密度的室内地磁数据,利用克里金法对该地磁数据进行差值处理,生成2 cm间隔大小的栅格地磁图,作为室内定位基准图保存在数据库中。 相似文献
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由于GPS不能满足用户对室内定位的需求,研究并开发基于Wi-Fi和Android平台的室内定位系统,利用位置指纹匹配算法和Kalman滤波实现室内定位。实验结果表明,该系统具有良好的实时动态定位效果。 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