潜在连接点集下拓扑推进三维建模算法研究

通过三维激光扫描仪可以获取到表示空间对象的点云数据。通过设置仪器的采样间隔可以获取到表示对象不同精密程度的点集。但是由于离散点之间缺乏相应的拓扑关系,限制了以点为基本图元的模型的应用。以空间离散特征点集为研究对象,研究了一种三维建模算法。算法基于距离较近的点之间比距离较远的点之间存在拓扑连接的可能性更大的前提,对点集进行预处理,然后在此基础上进行快速建模,最终获取到以三角形为基本面片的格网模型。所建立的模型易于进行各项空间分析和操作。该算法也能够有效地应用于更为复杂的建模任务中,以达到一体化建模的目的。     

Lesson Plans in Geography

Abstract

This article advocates that geography teachers undertake field studies of human systems with their students. A field trip process is described that helps teachers to guide students to explore and analyze a real human system with the expressed goal of building skills that can transfer to and complement a wide range of geographic learning tasks identified in Geography for Life: National Geography Standards 1994. Students are taken to a human system, such as a supermarket or a hotel. In groups, students interview as well as tour with a representative of a key department of the human system. Using teacher-supplied materials, groups create models or visual schematics of the whole human system they studied. The model must show the complex as a collection of interdependent elements with distinct functions. The learning outcomes achieved by students are a collection of geographic skills ideal for transfer to subsequent geographic investigations of urban places and or regions.     

Editorial Notes and News

Abstract

Thubten Jigme Norbu. Tibet Is My Country. As told to Heinrich Harrer; translated from the German by Edward Fitzgerald. E. P. Dutton &; Co., 300 Park Avenue South, New York 10, N.Y., 1961. 264 pages with color illustrations. $5.00.

Miriam Schlein. The Sun, The Wind, The Sea and The Rain. Abelard-Schuman Limited, 6 West 57 Street, New York 19, N.Y., 1960. 38 pages with illustrations by Joe Lasker. $2.75.

Robert L. Pendleton with the assistance of Robert C. Kingsbury and others. Thailand: Aspects of Landscape and Life. An American Geographical Society Handbook. Duell, Sloan and Pearce, 60 East 42nd Street, New York 17, N.Y., 1962. xv and 321 pages with table of contents, photographs, maps, charts and index. $10.00.

Stuart R. Tomkins. Life in America: Alaska. Revised edition. The Fideler Company, Grand Rapids 2, Michigan, 1961. 128 pages with table of contents, photographs, glossary and index. $2.48.

Harry C. Rubicam, Jr. Men at Work in the Great Plains States. G. P. Putnam's Sons, 200 Madison Avenue, New York 16, N.Y., 1961. 123 pages with table of contents, photographs, notes and index. $3.00.

Winifred Hammond. Rice: Food for a Hungry World. Coward-McCann, Inc., 210 Madison Ave., New York 16, N.Y., 1961. 160 pages with table of contents, references, maps, photographic illustrations and index. $3.50.

John C. and Elsie F. Caldwell. Our Neighbors in the Philippines. The John Day Company, Inc., 200 Madison Avenue, New York 16, N.Y., 1961. 45 pages with table of contents, photographs and illustrations by Heidi Ogawa. 12.00.

Sidney H. Gould, editor. Sciences in Communist China. (Pub. No. 68) American Association for the Advancement of Science, Washington, D.C., 1961. 872 pages with table of contents, tables and author, geographical and subject indexes. $14.00.

Gilbert F. White, editor. Papers on Flood Problems. Research Paper No. 70. Department of Geography, Rosenwald Hall, University of Chicago, Chicago 37, Illinois, 1961. 228 pages with illustrations. $4.00.

D. D. Harris and D. A. M. Lea. A Regional Geography of South Australia. Whitcombe and Tombs Pty., Ltd., 20 Bond Street, Melbourne, C. 1, Australia, 1961. 168 pages with table of contents, maps, diagrams and index. About $2.75.

Richard M. Highsmith, Jr., editor, and Jon M. Leverenz, cartographer. Altas of the Pacific Northwest: Resources and Development, 3rd edition. Oregon State University Press, Corvallis, Oregon, 1962. 168 pages with table of contents, photographs, tables, plates and index. $5.00.

Wiliam Lytle Schurz. Brazil, The Infinite Country. E. P. Dutton &; Co., 300 Park Avenue South, New York 10, N.Y., 1961. 316 pages with table of contents, maps, supplementary reading list and index. $6.00.

Umberto Nobile. My Polar Flights. G. P. Putnam's Sons, 200 Madison Avenue, New York 16, N.Y., 1961. 288 pages with table of contents, illustrations, appendix and index. $4.50.

Robert Engler. The Politics of Oil: A Study of Private Power and Democratic Directions. The Macmillan Company, 60 Fifth Avenue, New York 11, N.Y., 1961. viii and 565 pages with table of contents, notes and index. $7.50.

Edwin Thompson Denig. Five Indian Tribes of the Upper Missouri: Sioux, Arickaras, Assiniboines, Crees, Crows. (Edited and with introduction by John C. Ewers.) University of Oklahoma Press, Norman, Oklahoma, 1961. 217 pages with 12 illustrations, 1 map, editor's bibliography and index. $4.00.

J. P. Cole and F. C. German. A Geography of the USSR: The Background to a Planned Economy. Butterworth Inc., 7235 Wisconsin Avenue, Washington 14, D.C., 1961. x and 290 pages with table of contents, appendixes, notes, glossary, bibliography and index. $8.50.

Jane and Paul Annixter. Horns of Plenty. Holiday House, 8 West 13th St., New York 11, N.Y., 1960. 203 pages. $2.95.

Richard J. Ward and Lawrence A. Hoffman, editors. Readings in Economic Geography from Fortune. Henry Holt and Company, 383 Madison Avenue, New York 17, N.Y., 1960. 130 pages with table of contents, maps and graphs. $1.50

Helen Wolff Vogel and Mary Leonard Caruso. Ocean Harvest: The Future of Oceanography. Alfred A. Knopf, 501 Madison Avenue, New York 22, N.Y., 1961. 14 pages with illustrations by John Kaufman. $3.00.

The New Rand McNally Pocket World Atlas. Cardinal Edition. Pocket Books, Inc., 630 Fifth Avenue, New York 20, N.Y., 1961. 295 pages with table of contents, maps covering 169 pages and index. 75 cents.

Lowdon Wingo, Jr., Transportation and Urban Land. Resources for the Future, Inc., 1775 Massachusetts Avenue, N.W., Washington 6, D.C., 1961. 132 pages with table of contents, figures and appendices. $2.00.

Paul Fenimore Cooper. Island of the Lost. G. P. Putnam's Sons, 200 Madison Avenue, New York 16, N.Y., 1961. 256 pages with table of contents, map of King William Island and selected bibliography. $4.00.

Rhoads Murphey. An Introduction to Geography. Rand McNally and Company, P.O. Box 7600, Chicago 80, Illinois, 1961. 699 pages with table of contents, illustrations, chapter-end bibliographies, questions for further study, statistical appendix and index. $7.75.

Jordan A. Hodgkins. Soviet Power: Energy Resources, Production and Potentials. Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1961. 190 pages with table of contents, maps, tables and 34 pages of appendix tables. $5.25.

Andrew A. Freeman. The Case for Doctor Cook. Coward-McCann, Inc., 210 Madison Avenue, New York, N.Y., 1961. 315 pages with table of contents, sources, notes and acknowledgments and index. $5.75.

Frances H. Kohan and Truda T. Weil. Juan's Adventures in Mexico. Noble and Noble, Publishers, Inc., 67 Irving Place, New York 3, N.Y., 1961. 183 pages with table of contents, chapter study helps, illustrations and suggested reading list. $3.00.     

流域侵蚀产沙人类活动影响指数研究——以长江上游为例

流域产沙是土壤侵蚀的重要反映, 受降雨等自然要素和人类活动的共同作用。采用退 耦理论的思想和差分方法推导出流域侵蚀产沙人类活动影响指数的简易估算方法, 并对长江 上游的金沙江、乌江、嘉陵江、岷江分别计算人类活动总体贡献率。结果表明, 各流域人类 活动对侵蚀产沙变化的贡献率达72%～97%,总体上属于抑制侵蚀的正向活动。长江上游输 沙量呈阶段梯级变化, 根据流域侵蚀产沙人类活动影响指数的距平累积变化的突变特征将 1955～2009年划分为5个阶段并分析了每个阶段人类活动的主要特点及其对侵蚀产沙的影响。 其中, 20世纪80年代中期以前河流输沙量较大, 主要与“一五”、“大炼钢铁”、“三线建设”、 农村改革前期不稳定因素等密切相关, 而70年代河流输沙量较小是受当时大搞农田基本建设 和采取“挑沙面土”、“边沟背沟”等传统水土保持措施的影响, 80年代中期后河流输沙量明 显减少, 主要受社会经济稳定有序发展、水保工程的实施及大兴水库建设等影响。     

基于DPSIRM模型的社区人居环境安全空间分异——以大连市为例

以DPSIRM因果关系模型拟定指标体系,运用模糊层次分析法和综合比较法赋权并量化计算,基于地理信息系统空间分析方法,对大连社区人居环境状况和全空间分异格局进行研究,结果表明:大连市社区人居环境安全单元分为五个类别,即社区人居环境安全评价很差单元、社区人居环境安全评价较差单元、社区人居环境安全评价过渡单元、社区人居环境安全评价较好单元、社区人居环境安全评价优良单元;大连市人居环境安全的空间分布中各分区所占的比例为:人居环境安全区30.598%,人居环境较安全区30.232%,人居环境安全过渡区9.678%,人居环境较不安全区12.299%,人居环境不安全区17.193%;南部滨海区人居环境安全好,北部城乡结合部人居环境安全差,呈现由南向北递减趋势;中部是国家森林公园等植被覆盖好的区域,人居环境安全好。研究表明本文所建评价模型具有普遍性,可用于不同社区人居环境因子的评价与比较。     

中国乡村长寿现象与人居环境研究——以湖北钟祥为例

乡村长寿现象与人居环境的关系,是地理学与相关学科关注的课题。本文基于人文地理学与人居科学、环境科学和乡村社会等多学科视野,根据世界长寿之乡和中国百岁老人的分布规律,阐述了乡村长寿现象的涵义,分析了客观存在的乡村长寿现象及其成因。同时,以湖北钟祥为案例,运用模糊评价法、综合评价法和比较研究法,系统考究了乡村长寿现象与优越自然生态环境、和谐人文社会环境以及舒适人工居住环境的关系,归纳了乡村长寿现象的客观必然性和成因的综合性、长寿与人居环境的正相关性、山区与平原乡村长寿现象的同质性以及人类诉求健康长寿的永恒性等五个可供思考的重要命题,并对建设有利于"居民健康长寿"的乡村人居环境提出了相关政策建议。     

江苏冬夏季人体舒适度指数异常的背景场研究

利用江苏地区37个气象观测站1980—2009年逐日资料,及同时段美国NCEP/NCAR再分析资料以及北太平洋海温资料,通过合成和遥相关法,研究了当江苏冬、夏季人体舒适度指数（CIHB）出现异常偏高和偏低时,大气环流与北太平洋海温场的基本特征。结果表明：（1）CIHB偏高年较偏低年,冬季,东亚大槽偏浅,冬季风明显偏弱,尤其是北风分量偏弱最为明显,江苏上空下沉气流偏弱,均不利于冷空气东移南压以及向下入侵;夏季,副热带高压偏西、偏强,南亚高压偏东、偏北、偏强,夏季风明显偏强,尤其是南风分量偏强显著,导致往北的暖湿气流强盛,垂直运动总体偏弱,不利于夏季对流活动的发生。（2）冬季,CIHB偏高年中西太平洋的海温高于偏低年,尤其是在我国东部近海的黑潮区,偏暖幅度最为明显,无论是超前相关还是同期相关,西太平洋海温与冬季CIHB都是以正相关为主,其中暖池区的正相关最为显著。     

Coupled Model Simulations of Climate Changes in the 20th Century and Beyond

Several scenario experiments of the IPCC 4th Assessment Report （AR4） are performed by version g1.0 of a Flexible coupled Ocean-Atmosphere-Land System Model （FGOALS） developed at the Institute of Atmospheric Physics, Chinese Academy of Sciences （IAP/CAS）, including the ＂Climate of the 20th century experiment＂, ＂CO2 1% increase per year to doubling experiment＂ and two separate IPCC greenhouse gases emission scenarios AIB and B1 experiments. To distinguish between the different impacts of natural variations and human activities on the climate change, three-member ensemble runs are performed for each scenario experiment. The coupled model simulations show： （1） from 1900 to 2000, the global mean temper- ature increases about 0.5℃ and the major increase occurs during the later half of the 20th century, which is in consistent with the observations that highlights the coupled model＇s ability to reproduce the climate changes since the industrial revolution; （2） the global mean surface air temperature increases about 1.6℃ in the CO2 doubling experiment and 1.5℃ and 2.4℃ in the A1B and B1 scenarios, respectively. The global warming is indicated by not only the changes of the surface temperature and precipitation but also the temperature increase in the deep ocean. The thermal expansion of the sea water would induce the rise of the global mean sea level. Both the control run and the 20th century climate change run are carried out again with version g1.1 of FGOALS, in which the cold biases in the high latitudes were removed. They are then compared with those from version g1.0 of FGOALS in order to distinguish the effect of the model biases on the simulation of global warming.     

全球变化与区域干旱化

本文总结了已完成的国家重点基础研究发展规划计划项目(“973”项目)“我国生存环境演变和北方干旱化趋势预测”(1999～2004年)和正在执行的“973”项目“北方干旱化与人类适应”的有关干旱化问题研究的部分成果。主要是中国科学院大气物理研究所最近几年在近代区域干旱化的事实及全球联系方面的研究进展,并对全球增暖背景下区域干旱化的形成机理展开讨论。     

遥感图像空间分辨率改进值计算方法

为了克服超分辨重建后的遥感图像空间分辨率的界定还采用人工对比判读存在误差和结论不统一的缺点,利用调制传递函数、奈奎斯特采样定理和人眼极限频率,建立了一种新的空间分辨率客观评价方法。利用该方法计算超分辨率重建后的遥感图像相比原始遥感图像空间分辨率的提高倍数,从而推断出重建后遥感图像的空间分辨率的大小。在数值测试中,利用不同的超分辨率方法对分级变频矩形光栅图像进行重建,采用提出的空间分辨率评价方法,与归一化均方误差、峰值信噪比、信息熵、灰度平均梯度进行客观评价的结果一致。此方法为遥感图像空间分辨率改进值的计算提供了一种可行的量化模型。