灰色时变参数模型及其对气候预报的应用

本文提出关于灰色系统预报的一种新模型，并应用该模型对蒙自5月雨量进行了预报。结果表明:灰色时变参数模型的预报准确性与其他几类模型相比有显著提高。     

动态基态修正的地籍时空数据库设计

针对地籍数据的时态特性及变更特点,提出了一种基于基态修正的地籍时空数据模型的改进方法,通过引入动态变粒度方法减少了数据存储量,降低了数据的冗余。基于该模型在建库过程中引入了基态库和差文件库,并利用动态属性数据对现势库和历史库中的宗地属性数据进行地籍管理;通过建立变更库确定父子宗地,加强现势库与历史库的时态关联,提高了数...     

BOOK REVIEWS

Books reviewed in this article: The Mexican Colonial Copper Industry. Elinore M. Barrett . The Control Revolution: Technological and Economic Origins of the Information Society . James R. Beniger . Land Degradation and Society . Piers M. Blaikie And Harold C. Brookfield , Eds . La carte, mode d'emploi. Roger Brunet . France: les dynamiques du territoire . Roger Brunet AND Jacques Sallois , EDS. At the Crossroads—The Mineral Problems of the United States . Eugene N. Cameron . A Census of One Billion People , Papers for International Seminar on China's 1982 Population Census. Li Chengrui , ED. Les Milieux “Naturels” du Globe . Jean Demangeot . The Geophysiology of Amazonia: Vegetation and Climate Interactions : Robert E. Dickinson , ED. Tenn-Tom Country . James F. Doster And David C. Weaver . Family Farming in Europe and America . Boguslaw Galeski And Eugene Wilkening , EDS. The Geography of Urban Transportation . Susan Hanson , Ed. Combating Desertification in Developing Countries . J. K. Jain , ED. Cartography in France—1660–1848. Science, Engineering and Statecraft . Josef W. Konvitz . Distribution of Distances in Pregeographical Space . Hans Kuiper . Physical Geography Lab Manual: A New Experimental Approach . Neal G. Lineback And John M. Harlin . Physical Geography: A Landscape Appreciation , 2nd ed. Tom L. Mc Knight . The Desert Is No Lady: Southwestern Landscapes in Women's Writing and Art . Vera Norwood And Janice Monk , EDS. France: A Geographical, Social, and Economic Survey . Philippe Pinchemel , translated, by D. Elkins and T. H. Elkins. Gene Banks and the World's Food . Donald L. Plucknett , Nigel J. H. Smith , J. T. Williams , And N. Murthi Anishetty . Latin American Development: Geographical Perspectives . David Preston , Ed. Making Sense of Development: An Introduction to Classical and Contemporary Theories of Development and Their Application to Southeast Asia . P. W. Preston . The History of the Countryside. Oliver Rackham . The Third World in Perspective . H. A. Reitsma AND J. M. G. Kleinpenning . The Industrial Geography of Australia . David C. Rich . The Recruiting Game , 2nd Ed., revised. John F. Rooney , JR. A Cultural Geography of North American Indians . Thomas E. Ross AND Tyrel G. Moore , EDS. Eastern Europe . Dean S. Rugg . Human Territoriality: Its Theory and History . Cambridge Studies in Historical Geography: 7. Robert David Sack . Experimental Fluvial Geomorphology . Stanley A. Schumm , M. Paul Mosley , AND William E. Weaver . The New Urban Landscape . David Schuyler . Atlas of American Women . Barbara Gimla Shortridge . Impacts of Hazardous Technology: The Psycho-Social Effects of Restarting TMI-1 . John Sorensen , Jon Soderstrom , Emily Copenhaver , Sam Carnes AND Robert Bolin . Modern Physical Geography , 3rd Ed., (Third Edition). Arthur N. Strahler AND Alan H. Strahler . India: Economic Resource Base and Contemporary Political Patterns . B. L. Sukhwal .     

基于ArcGIS Engine的小型地籍信息管理系统的开发

在地籍信息的管理建设中,将地籍数据的属性数据与矢量数据一体化,建立小型的地籍信息管理系统,可以降低管理成本,为地籍信息管理工作提供便捷的管理手段和有效的决策。本文对地籍信息管理系统的现状进行了研究,总结了系统的总体框架,并且阐述了所涉及的关键技术,选用.NET架构搭建平台,利用C/S模式实现了小型地籍信息管理系统的开发。根据系统的需求与数据的特征,以ArcGIS Engine、VS2010、C#为开发工具,在ArcCatalog中建立文件地理数据库,实现了查询、统计、数据的编辑更新、空间分析、专题图制作、统计与输出等功能。通过实验数据验证,本系统操作简便,可满足对地籍数据管理的需要。     

VR技术在城市地籍信息系统中的应用

从方便人们应用的角度出发，将虚拟现实技术引入城市地籍信息系统中，首先介绍了虚拟现实技术的系统组成及硬，软件，然后给出了城市三维建模的两种方法，最后列举几个将虚拟现实应用于城市地籍信息系统进行空间分析，查询的例子。     

基础地理信息数据更新中地籍测绘成果的应用

随着城市化进程的不断加快,城市基础地理信息的更新有了更高的要求,在城市基础地理信息的更新中,正确合理地引入地籍测绘成果具有重要意义,可以大大提高数据更新的速度,保证更新质量,从而使城市建设更为规范和有序。本文以基础地理信息数据更新和地籍测绘成果两者的相关性和差异性入手,对基础地理信息数据的更新进行了系统分析,并在此基础上对地籍测绘成果的应用要点进行了说明。     

基于水平传感器-光纤陀螺-全站仪组合的地籍测量新方法

针对全站仪测量技术存在作业周期长、劳动强度大和受观测环境影响严重等不足,本文将光纤陀螺寻北技术、倾角测量技术应用于地籍测量中,降低了地籍测量对控制点及水平度的依赖,有效地提高了测量效率,推导了全站仪在倾斜状态下界址点测量和定向的计算公式。结合全站仪可水平旋转180°的特点,给出了光纤陀螺安装误差自补偿的操作步骤;对影响定向精度的主要误差源进行仿真分析,结果表明:光纤陀螺精度与水平传感器精度对定向精度影响较大,在光纤陀螺精度为0.05°/h情况下,当倾角测量误差为1'时,定向误差为26.51″。     

综合考虑多种变形因素的近岸规则波传播数学模型Ⅰ. 基本方程的导出

推广了Kirby的有环境水流影响的缓坡方程,得到了综合考虑环境水流(水流因子)、非线性弥散影响(非线性因子)、底摩擦波能损失(底摩擦因子)、非缓坡地形影响(地形因子)、折射、绕射、波浪破碎多种变形因素的波浪传播控制方程,并给出了非线性因子、地形因子、底摩擦因子、水流因子的确定方法。基于导出的方程做进一步推导,得到了波高和波向为变量的综合考虑多种变形因素的波浪传播基本方程,该方程有许多优点:1)其绕开了求解波势函数的困难,将椭圆型方程的边值问题化为初值问题;2)直接求解波高和波向;3)可采用有限差分法离散求解,对空间步长没有限制,适合大面积海区波场计算;4)综合考虑了多种波浪变形因素,方程更为合理,5)容易处理波浪破碎问题。     

一种水池中组合活动堰的潮位潮流模拟系统

水工模型实验中,潮流模拟系统往往控制复杂,且调试困难。本文给出一种用单板机控制步进电机驱动高低组合活动堰板造潮的水动力控制系统,经实验验证,本系统控制简单,调试方便,造价低廉。     

Numerical Calculation for Nonlinear Waves in Water of Arbitrarily Varying Depth with Boussinesq Equations

Based on the high order nonlinear and dispersive wave equation with a dissipalive term, a numerical model for nonlinear waves is developed. It is suitable to calculate wave propagation in water areas with an arbitrarily varying bottom slope and a relative depth h/ L0≤ 1. By the application of the completely implicit slagger grid and central difference algorithm, discrete governing equations are obtained. Although the central difference algorithm of second-order accuracy both in time and space domains is used to yield the difference equations, the order of truncation error in the difference equation is the same as that of the third-order derivatives of the Boussinesq equation. In this paper, the correction to the first-order derivative is made, and the accuracy of the difference equation is improved. The verifications of accuracy show that the results of the numerical model are in good agreement with those of analytical solutions and physical models.