狭长区域下基于正交法的GPS高程拟合研究     

郭英起  伊晓东  黄瑞金  李胜 《测绘工程》2007,16(6):19-21

将GPS点大地高直接转换成正常高,越来越广泛地应用于建立高程控制网的实践中。而要保证GPS点高程精度的关键是高程异常拟合模型选择的合理性。文中介绍了在狭长带状区域下利用正交函数法拟合GPS点高程的数学模型。并利用试验数据进行比对分析。结果表明,文中提出的方法计算具有算法稳定,成果合理的特点。  相似文献   

空间目标信息系统的访问控制方案设计     

於建峰  王光霞  万刚 《测绘工程》2007,16(6):38-41

空间目标信息系统(STIS)是基于空间信息实现重要目标信息采集、管理、显示、查询、分析等功能的一种面向多部门、多应用的分布式地理信息系统,不同用户具有不同的操作权限。引入基于角色的访问控制技术,从访问控制体系结构、RBAC数据库、用户访问控制流程3个不同的角度对STIS访问控制方案设计进行了详细阐述。该方案对于保证系统的安全性和明确用户职责具有非常重要的意义。  相似文献   

遥感图像中GPS控制点的建立     

石俊成  唐庆隆  刘纲 《测绘工程》2007,16(4):53-55

利用GPS和高精度GAMIT计算软件,沿长江建立了以宜昌、监利、锣山、武汉4个地区的遥感控制点。每个测区采用设置长时间控制点观测,将其与武昌九峰GPS观测点进行联合处理,使得每个控制点的精度高于0.5m,保证了控制点精度满足1m遥感卫星图像的纠正要求。  相似文献   

图形化方式的测量平差程序开发与研究     

李沛鸿  徐昌荣  曾宪珪 《测绘科学》2007,32(1):38-39

采用Autolisp[1]及VC++[2]语言编程,按照测量平差[3]的传统模式,在计算机屏幕上绘制控制网草图,用类似于在草图上标注已知数据和观测数据的形式输入数据,然后进行平差计算。程序的使用直观方便,操作简单,容易掌握。本程序能对各种类型的控制网进行严密平差及方差分量估计,并输出平差后的各种信息。  相似文献   

Evaluating the influence of mixture composition on the kinetics of salt damage in wall paintings using time lapse video imaging with direct data annotation     

Alison Sawdy  Adrian Heritage 《Environmental Geology》2007,52(2):303-315

This paper presents an examination of the timescale of phase transition behaviour of a series of salts known to cause damage to wall paintings and other cultural property. The rate of deliquescence and crystallisation of single salts (nitromagnesite and halite) under different RH regimes, and the extent to which this was affected when mixed with other salts (niter, nitratite and gypsum), was investigated. The study was conducted using simple conventional techniques (mass measurements over time) and also using an innovative new method: timelapse video imaging with online data annotation. The results demonstrate the synergy gained from combining video imaging with environmental data in reference to time in the study of salt phase changes: where it revealed new information concerning the kinetics of deliquescence and crystallisation. The implications of these results for the implementation of environmental control measures within historic buildings are discussed.

Alison SawdyEmail:

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胶东金矿区夏甸金矿床矿化分布规律及构造控矿分析          下载免费PDF全文

刘玉桥  李寿磊  牟志军 《山东国土资源》2022,38(10)

夏甸金矿床是胶西北地区典型的蚀变岩型金矿床,金矿化主要受招平断裂带控制。本文对夏甸金矿床进行了野外地质调查,三维地质建模和构造空间分析,以期从三维空间和勘查数据中厘清矿化分布规律、探明构造控矿作用。研究结果显示,夏甸金矿床矿化主要为蚀变岩型和硫化物脉型,主要受招平断裂带及其次级构造控制,在空间中呈现出不均一分布的特征。夏甸金矿床的矿化侧伏规律,在空间中存在差异性,其中南部为NE侧伏,中段侧伏规律不明显但分支复合特征明显,而北段呈SE侧伏。这种侧伏规律与招平断裂带主裂面在走向方向的转折密切相关。进一步的空间分析显示,夏甸金矿床不同类型的矿体是不同空间范围内构造变形差异的结果。  相似文献   

Book Reviews     

《The Professional geographer》1999,51(4):610-620

Books reviewed: Robert W. Christopherson (ed.) Elemental Geosystems Gertjan Dijkink National Identity and Geopolitical Visions: Maps of Price and Pain David Farrell Krell Architecture: Ecstasies of Space, Time and the Human Body Victor L. Mote Siberia: Worlds Apart Richard Pillsbury No Foreign Food: The American Diet in Time and Place Grant R. Staff Changing Cape Town: Urban Dynamics, Policy, and Planning During the Political Transition in South Africa David Briggs, Peter Smithson, Kenneth Addison, and Ken Atkinson Fundamentals of the Physical Environment H.J. DeBlij and Peter O. Miller Physical Geography of the Global Environment Chris Park The Environment: Principles and Applications Alan Strahler and Arthur Strahler Introducing Physical Geography  相似文献   

A non-local thermodynamic equilibrium spherical line-blanketed stellar atmosphere model of the early B giant β CMa     

J. P. Aufdenberg  P. H. Hauschildt  E. Baron 《Monthly notices of the Royal Astronomical Society》1999,302(3):599-611

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沙地节水渗灌自动控制系统的研制     

赵爱国  荔克让 《中国沙漠》1999,19(2):165-168

文章介绍了一种沙地节水渗灌自动控制系统装置,主要叙述了渗灌装置的结构组成与连接方法,以及系统的软、硬件组成与仪器功能指标,整个系统设计简洁,成本低,可靠性好,能自动监测沙地水分上下限和渗坛水位上下限,根据所需信息系统自动向管道供水,大幅度减轻操作人员的劳动强度。采用微机技术有利于农业现代化管理,是我国节水渗灌农业值得推广的自动化控制系统  相似文献   

Rovibrational excitation of HD in collisions with atomic and molecular hydrogen     

D. R. Flower  E. Roueff 《Monthly notices of the Royal Astronomical Society》1999,309(4):833-835

We have computed cross-sections and rate coefficients for rovibrational transitions in HD, induced by collisions with atomic and molecular hydrogen. We employed fully quantum-mechanical methods and the potential of Boothroyd et al. for H–HD, and that of Schwenke for H₂–HD. The rate coefficients for vibrational relaxation v =1→0 of HD are compared with the corresponding values for H₂. The influence of vibrationally excited channels on the rate coefficients for rotational transitions within the v =0 vibrational ground state of HD is shown to be small at T =500 K, where T is the kinetic temperature. The rate coefficients, for 100 T 2000 K, are available from http://ccp7.dur.ac.uk/.  相似文献