GPS-RTK技术在地籍测量中的应用

随着近些年GPS RTK技术的出现以及GPS空间定位精度的不断提高,GPS RTK已被广泛地应用于控制测量、地籍测量、地形图测量中。本文结合地籍测绘工作实践重点介绍了RTK技术的基本原理、优势以及应用注意的问题等,可见GPS RTK技术在确保测量成果精度可靠性的前提下,很大程度上提高测图作业效率的明显优势。     

GPS RTK技术在公路测量中的应用

首先简要介绍了GPS技术在公路测量方面的前景和RTK技术的基本原理,然后着重分析了GPSRTK定位中的关键技术,最后说明RTK技术在公路测量中的功能和作用。     

RTK技术在公路测量中的应用

本文主要以RTK技术的工作原理和特点，简述了GPS的RTK测量技术的优越性，以及在公路测量中的应用现状。     

Hi-RTK Road在道路施工测量教学中的应用

GPS RTK定位技术以其测量精度高、布网灵活、操作方便的优势,在公路测量领域有着广泛的应用,也是道桥专业技术人员应该掌握的基本技能之一。本文以大连海洋大学道桥专业为例,对测量实践教学环节中应用GPS RTK技术进行了探索,并介绍了应用Hi-RTK Road软件开展道路施工测量实习教学的具体做法,对于普通高校应用型人才培养具有重要的借鉴意义。     

GPS在公路测量的应用

本文主要介绍了GPS在公路测量中的应用及其对公路勘测的巨大推进作用,并结合GPS和公路测量的特点,比较公路测量中GPS测量与常规测量的优劣,并通过实例证明GPS用于公路测量是完全可行的,它在很大程度上可以提高测量的工作效益并节省费用。新一代RTK系统功能双频GPS接收机诞生,给当今公路测绘事业带来了新的活力。     

RTK测量技术在城市测量中的应用与优势分析

在城市化进程中,城市测量是城市建设的基础和重要环节。随着全球定位系统(GPS)技术的快速发展,CPS RTK(Real Time Kinematic)测量技术也日益成熟,RTK测量技术逐步在测绘中得到应用。GPS RTK测量技术因其精度高、实时性和高效性,使得其在城市测绘中的应用越来越广。本文结合作者多年的相关工作经验总结了RTK测量在城市测量中的应用,并对RTK测量与传统测量作一个综合的比较分析。     

GPS RTK技术在“数字吴忠”地理空间框架中的应用

通过在"数字吴忠"中应用GPS RTK技术的实践,重点介绍了GPS RTK技术的原理以及整个生产作业流程,介绍了GPS RTK在地形测量中的应用及注意事项。通过实践结果分析得出结论,GPS RTK与常规地形测量法相比,GPS RTK技术不仅能达到地形测量的精度要求,而且完全可以满足1∶500、1∶1 000,1∶2 000航测成图的要求。     

浅述RTK测量技术在道路测量中的应用

针对道路测量工作的需要,服务道路测量前期工作,介绍RTK技术的基本原理和测量技术,探讨RTK测量在公路测量中的大比例尺带状地图绘制、道路的纵横断面放样、土石方计量和道路的中线施工放样中的应用.     

GPS—RTK技术在地籍测量中的应用

结合平度市地籍测量,简单介绍GPS—RTK技术的的测量方法,对GPS—RTK技术的可靠性、稳定性及定位精度进行分析,认为只要采取合适的观测方法,GPS—RTK技术完全可以应用于地籍测量。     

RTK在公路设计断面测量中的应用

介绍了在公路勘测中RTK作业流程,讨论了RTK技术在公路勘测横断面测量等方面的应用,以实例证明RTK测量的高精度,并且提出了将RTK技术应用于路线断面测量的基本方法和数据处理模式。     

Pinpointing the sources and measuring the lengths of the principal rivers of the world

Abstract

Cultures throughout the world are associating with the rivers. People depend upon the rivers and their tributaries for food, water, transport, and many other aspects of their daily lives. Unfortunately, human beings have not calculated the accurate lengths for the great rivers even today. The lengths of the rivers are very different in popular textbooks, magazines, atlases and encyclopedias, etc. To accurately determine the lengths of the principal rivers of the world, the combination of satellite image analysis and field investigations to the source regions is proposed in this paper. The lengths of the Nile, Amazon, Yangtze, Mississippi, Yellow, Ob, Yenisey, Amur, Congo and Mekong, with lengths over or close to 5000 km, were calculated using the proposed method. The results may represent the most reliable and accurate lengths of the principal rivers of the world that are currently achievable.     

世纪之交的沉思--论21世纪软科学的发展

软科学这一术语是70年代在国外提出的.然而30多年以来,它在国外不仅未得到普遍的承认,而且对软科学的定义也还未能达成大体上一致的共识.而在改革开放后的中国,出于决策科学化和民主化的需要,经过一些领导人的提倡和支持,特别是通过1986年召开的软科学座谈会及1994年召开的全国软科学工作会议,软科学事业得到了蓬勃的发展.据初步统计,截止1998年底全国共有软科学研究机构1224个,研究人员32655人,初步形成了一支较为强大的研究队伍,并取得了数百项覆盖多个领域的研究成果,为支持各级各类的决策发挥了一定的作用.     

Improving the modeling of the atmospheric delay in the data analysis of the Intensive VLBI sessions and the impact on the UT1 estimates

The very long baseline interferometry (VLBI) Intensive sessions are typically 1-h and single-baseline VLBI sessions, specifically designed to yield low-latency estimates of UT1-UTC. In this work, we investigate what accuracy is obtained from these sessions and how it can be improved. In particular, we study the modeling of the troposphere in the data analysis. The impact of including external information on the zenith wet delays (ZWD) and tropospheric gradients from GPS or numerical weather prediction models is studied. Additionally, we test estimating tropospheric gradients in the data analysis, which is normally not done. To evaluate the results, we compared the UT1-UTC values from the Intensives to those from simultaneous 24-h VLBI session. Furthermore, we calculated length of day (LOD) estimates using the UT1-UTC values from consecutive Intensives and compared these to the LOD estimated by GPS. We find that there is not much benefit in using external ZWD; however, including external information on the gradients improves the agreement with the reference data. If gradients are estimated in the data analysis, and appropriate constraints are applied, the WRMS difference w.r.t. UT1-UTC from 24-h sessions is reduced by 5% and the WRMS difference w.r.t. the LOD from GPS by up to 12%. The best agreement between Intensives and the reference time series is obtained when using both external gradients from GPS and additionally estimating gradients in the data analysis.     

Movements of the protoplanetary superconducting particles in the magnetic field of the Saturn lead to the origin of the rings

In this letter, we are trying to resolve the electromagnetic problem for the movements of the superconducting particles of the protoplanetary cloud in the magnetic field of Saturn. The force of levitation (Meissner-Ochsenfeld phenomenon) is introduced to the field of planetary science for the first time. It is shown from our theoretical analysis that rings of Saturn might have a superconducting origin, and rings might levitate within magnetic equator plane of the planet.     

省直管市（县）体制下建设用地监管技术研究

面向解决省直体制下市（县）建设用地管理业务监管难度大问题,研究建设用地全过程监管关键技术,设计该模式下的监管模式、技术架构、业务模型和数据模型,实现省直管市（县）模式下的建设用地批前、批中、批后＂批-供-用-补-查-登＂全过程监管。     

GPS整周模糊度确认中残差二次型次小与最小之差的分布问题

根据残差二次型次小与最小之差进行整周模糊度确认的关键是差值的分布,只有得到了合理的差值分布才可确定合理的界值.文中基于原有的两种方法及这两种方法的不足,从理论上导出了满足条件的差值分布,并作了一定的说明.