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《测绘与空间地理信息》2020,(6)
丽水市滩坑饮水隧道工程控制网由25个控制点组成,观测同步基线最远达到了58 km。本文采用GAMIT10.61版本解算工程控制网基线和CosaGPS V5.21进行网平差解算。结果表明:GAMIT解算的工程基线优于10-6,Cosa GPS平差整网形最弱边的基线相对精度为为1/9 528 000,ppm=0.10。 相似文献
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随着高速铁路在我国的大规模建设,各种等级GPS铁路控制网的布设也陆续展开,用于解算GPS基线的软件,除了各种随机软件如TGO、LGO等外,GAMIT也是一款解算GPS基线的可靠工具,利用GAMIT可以有效消除长基线观测中电离层的影响[1],且可以加入潮汐改正。本文介绍了GAMIT软件在多天多时段工程控制网中的解算流程,以及相应的C-SHELL批处理程序[2],分析了不同星历对基线解算结果的影响,验证了超快速星历与快速星历同样可以获得高精度及高可靠性的解算结果。 相似文献
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中国大陆构造环境监测网络由260个连续全球定位系统观测站点和2 000个不定期全球定位系统观测站点构成,一般采用GAMIT或Bernese高精度数据处理软件进行处理。由于GAMIT及Bernese软件对测站数处理能力的限制,必须对陆态网连续运行基准站进行分区解算。针对这一问题,为研究不同分区方案对陆态网解算精度的影响,该文基于全国55个陆态网络连续运行基准站数据,采用整网解算方案以及间距分区法和区域子网划分法分别进行解算,并以整网解算结果作为标准值,对比两种分区方案与整网解算方案的基线长度差及坐标差。结果表明,间距分区方案解算精度比区域子网划分方案精度高,可实现对陆态网分区的高精度解算。最后利用间距分区法对全国240个陆态网络连续运行基准站进行分区解算,得到了较高精度的解算结果。 相似文献
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随着长距离新型跨海桥梁的不断涌现,桥梁平面控制网的精度要求也越来越高,需要应用高精度的GPS数据处理软件进行基线解算,GAMIT是其中的代表之一,其优点是运算速度快、处理长基线效果好、精度高。介绍了GAMIT软件组成、解算流程,分析了数据准备和基线解算的基本过程和方法,总结了基线解算中的一些技巧;最后,应用港珠澳大桥首级GPS控制网的观测数据进行了算例分析,验证了GAMIT用于长距离跨海桥梁平面控制网的高精度及其可靠性。 相似文献
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为充分了解TBC(Trimble Business Center)与CosaGPS(科傻)软件在GNSS数据处理时精度检核指标上的异同,本文在简要介绍各检核指标的基础上,利用试验网实测数据进行数据处理分析,得到了TBC与CosaGPS各指标基本一致的结论,完全可以仅采用TBC完成基线解算与网平差获得满足规范和作业要求的成果与报告. 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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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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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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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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李志宽 《测绘与空间地理信息》2009,32(2)
3维技术以其直观、眩目的表现力深受人们喜爱.利用3S技术和Skyline开发平台,可以构建大型企业3维地理信息系统,以满足企业设计部门和资产管理部门对基础地理信息的需求.兼容原有2维系统的总图3维信息系统,将为企业的日常管理、设计施工、分析统计、规划决策等提供更加可靠、直观、多层次、多功能的综合服务信息. 相似文献