D.S.型解析测图仪交会原理与解算方法

本文讨论了利用三个平面交会模型点位置的原理,其中一个平面通过模型点,另外两个平面是通过一个或两个相应象点的“x-平面”和“y-平面”。然后与 AP 型解析测图仪一样,用共线方程由模型点座标计算未知的由伺服系统控制的象点座标。在这个原理的基础上,推导了 DS 型解析测图仪上各种作业方式(测点、测绘等高线以及高程断面的扫描)的计算公式。     

Aggregate accessibility to population at the county level: U.S. 1940–2000

 A classic study by Harris (1954) shows a map of U.S. national accessibility. Harris argued that access to population and income represents a critical factor for location analysis. Such maps and analyses are now readily produced by geographical information systems, allowing experimentation with various parameters, and explorations of changes. By comparing changes in these measurements we can develop a synthetic picture of the impacts of population redistribution. This paper offers a comprehensive review of these calculations and illustrates their use with maps from county population in the continental U.S. from 1940 through to 2000. Received: September 2002 / Accepted: January 2003 RID="*" ID="*" Previous versions of this paper were presented to the Initiative in Population Research (IPR) workshop at the Ohio State University (Horner) and to the Center for Spatially Integrated Social Sciences (CSISS) Summer Workshop in Accessibility (O'Kelly). Thanks to the referees for helpful comments.     

Measuring land-use and land-cover change using the U.S. department of agriculture’s cropland data layer: Cautions and recommendations

Monitoring agricultural land is important for understanding and managing food production, environmental conservation efforts, and climate change. The United States Department of Agriculture's Cropland Data Layer (CDL), an annual satellite imagery-derived land cover map, has been increasingly used for this application since complete coverage of the conterminous United States became available in 2008. However, the CDL is designed and produced with the intent of mapping annual land cover rather than tracking changes over time, and as a result certain precautions are needed in multi-year change analyses to minimize error and misapplication. We highlight scenarios that require special considerations, suggest solutions to key challenges, and propose a set of recommended good practices and general guidelines for CDL-based land change estimation. We also characterize a problematic issue of crop area underestimation bias within the CDL that needs to be accounted for and corrected when calculating changes to crop and cropland areas. When used appropriately and in conjunction with related information, the CDL is a valuable and effective tool for detecting diverse trends in agriculture. By explicitly discussing the methods and techniques for post-classification measurement of land-cover and land-use change using the CDL, we aim to further stimulate the discourse and continued development of suitable methodologies. Recommendations generated here are intended specifically for the CDL but may be broadly applicable to additional remotely-sensed land cover datasets including the National Land Cover Database (NLCD), Moderate Resolution Imaging Spectroradiometer (MODIS)-based land cover products, and other regional, national, and global land cover classification maps.     

基于Flex和.NET的B/S系统权限管理的设计与实现

RIA技术具有交互能力强、界面表现力丰富等特点,成为目前B/S系统的主要开发方式。而权限管理作为系统必不可少的组成部分,是系统稳定和数据安全的保障。介绍开发过程中使用的主要技术,阐述基于Flex和.NET技术开发的权限管理的设计方案和实现方法,并成功应用于工业总图共享服务系统中。实践证明,该权限管理设计方案具有灵活简便、安全性高、扩展性强和业务无关性等优点。     

基于Corel R.A.V.E.的动态地图编制

以蕲春县1990年至2002年人口变化动态地图的制作过程为例,详细介绍了使用Corel R.A.V.E.制作动态地图的主要方法。     

Horizontal and vertical accuracy of Google Earth®: comment on ‘Positional accuracy of the Google Earth terrain model derived from stratigraphic unconformities in the Big Bend region,Texas, USA’ by S.C. Benker,R.P. Langford and T.L. Pavlis

Comment on ‘Positional accuracy of the Google Earth terrain model derived from stratigraphic unconformities in the Big Bend region, Texas, USA’ by S.C. Benker, R.P. Langford and T.L. Pavlis (Geocarto Int. 26:291–303, doi: 10.1080/10106049.2011.568125).     

ICA现任主席——D.R.F.泰勒

泰勒(Taylor)博士出生于苏格兰,1966年移居加拿大。现为加拿大渥太华卡尔登(Carleton)大学地理学和国际事务教授兼研究生院学术副院长。泰勒毕业于英国爱丁堡大学,并在伦敦大学进行教育学研究生学习。他在地图学方面的研究兴趣为机助地图学的应用与地图学教育。近年的研究集中在应用微机设计与制作地图。他热衷于发展“新地图学”的理论与实践,对第三世界的发展与地图学在空间规划中的应用也深感兴趣。     

Prof.&Ph .D DU Qingyun

Ph .DDUQingyun ,aprofessorofCartographyandGIS ,isadeputydirectorofSchoolofRe sourceandEnvironmentScience ,WuhanUniver sity .HeheldaB .A .andM .S .inCartographyfromWuhanTechnicalUniversityofSurveyingandMappingandPh .DinCartographyandGISfromWuhanUniversity .Hehasplayedaleadingrolenationallyintheresearchonconceptualmodelofgeographicalinformation ,digitalmappingandmultimediaelectronicmapsystem .Prof.DUQingyunservedasamemberoftheInternationalCartographicAssociationCommissiononMapUse…     

人物介绍—P.V.Angus-Leppan

<正> P.V.Aagus-Leppan教授是新当选的国际大地测量协会主席,任期四年(1983—1987年)。该职务首次由澳大利亚人担任,也是首次由欧洲或北美以外的人担任。P.V.Angus-Lsppan教授是在1983年8月于汉堡举行大会期间当选的。上一届会议是1979年12月于堪培拉召开的,他在那次会议上当选为组织委员会主席。P.V.Angus-Leppan教授是新南威尔士     

苏联Ф.Н.克拉索夫斯基 В.В.达尼洛夫合著的“大地测量学”简介

本书是苏联测绘科学的权威著作。著者克拉索夫斯基教授是苏联杰出的大地测量学家,由于他一生辛勤卓越的供献,曾荣任苏联科学院通信院士,著名的克拉索夫斯基椭圆体即为克氏所推算,并因此而获得斯大林奖金。达尼洛     

迈巴赫62S ZEPPELIN

迈巴赫新旗舰车型Zeppelin继承了上世纪30年代迈巴赫同名轿车的传统,成为新一代终极奢华机器。它在外观方面最明显的变化就是采用了不同颜色的“肩线”贯穿整个车身,尽显尊贵与时尚。     

苏联人民建立Ф.Н.克拉索夫斯基纪念碑

（本刊消息）苏联人民为了永久纪念伟大的已故苏联测量学家Ф．Н．克拉索夫斯基教授对苏联及世界测量事业的贡献。于莫斯科东北约400公里的加里奇（Галич）城里经区苏维埃委员会提议在克拉索夫斯基曾经学习过的学校房屋墙上,建造了有关他生平事     

现代地图学：定义.结构.任务

现代地图学：定义·结构·任务［俄］Ｂ．．ＣＥＭＥＨＯＢ在２０年代地图制图学被看作是一门研究地图编制和复制手段与方法的纯技术性科学；在３０年代末和４０年代认为地图制图学是一门研究地理囹及其编制与复制手段和方法的科学；在５０年代地图制图学的定义包括了地图...     

应用C/S与B/S混合结构的矿产资源管理信息系统

为了利用GIS对矿产资源进行有效的管理,对C/S和B/S两种网络体系结构进行了比较分析,并简单介绍了两种模式开发平台ArcEngine和ArcGIS Server。在GIS技术和数据库技术的支持下,对系统进行设计开发,实现了基于C/S和B/S混合结构的平顶山矿产资源管理系统。