共查询到20条相似文献，搜索用时 563 毫秒
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Peter A. Rogerson 《The Professional geographer》2013,65(4):686-694
The geographic center of a region is a fundamental geographic concept, and yet there is no commonly accepted method for its determination. This article discusses some of its history as well as its definition and calculation, and a new method for its calculation is suggested. The new method minimizes the sum of squared great circle distances from all points in the region to the center. This entails (1) projecting regional boundary points using an azimuthal equidistant projection, (2) finding the geographic center of the projected two-dimensional region, and (3) then transforming this location back to a latitude and longitude. This new approach is used to find the geographic center of the contiguous United States and to provide a new list of the geographic centers for U.S. states. This list improves on the widely used but inaccurate list published by the United States Geological Survey in 1923. 相似文献
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"In Nepal, the drama of human and environmental ills is increasingly being played out in the form of peasants' ecopolitical battles over common land access and control, such as in the Tarai frontier, a region bordering the Gangetic Plain of India. This is a complex battle, pitting peasants' day-to-day survival against environmental security on one front, and against the Nepalese State and its dominant class interests on the other. This article critically dissects this raging battle to gain a clear understanding of its complexities as well as its diverse roots." 相似文献
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Characteristics and Altitudinal Distribution of Periglacial Decay Phenomena in the Massif of Rondane,Central Norway 
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下载免费PDF全文 Riwan Kerguillec 《Geografiska Annaler: Series A, Physical Geography》2015,97(2):299-315
The Norwegian massif of Rondane is part of the Scandes Mountains and is subject to polar, oceanic and continental influences. Because of its climatic context and its quartzitic structure, the massif has one of the thickest functional periglacial belts in Europe (1200 m). This belt is not fixed considering its translation in altitude since the end of the Little Ice Age. This mobility is continuing and involves periglacial decay dynamics which are revealed by numerous and various periglacial forms in the field. Because of their frequency in the massif and also their sensitivity to climate fluctuations, earth patches and small non‐sorted circles have a diagnostic value for current periglacial climate fluctuations. The major aim of this study is to propose several indicators of this periglacial decay and to highlight its consequences on periglacial belt mobility because these landforms enable the delimitation of a critical belt of decay in the massif. 相似文献
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拓扑空间关系描述理论研究现状与发展 总被引：1，自引：1，他引：0
空间关系研究是空间信息科学的基础,而拓扑空间关系是空间关系的重点与难点,其描述理论一直是研究的热点。该文就这一理论做一综述,阐述“交互模型”(即“区域连接演算”)的基本原理,并介绍其在空间信息科学界基本的理论问题,即该描述理论对应的数学模型包括拓扑学和代数两方面;揭示“交叉模型”(即“九交模型”)所用的拓扑学思想,并叙述其历史发展过程。对连接这两种模型的Mereotopology理论,阐述其概念与基本原理,指出拓扑空间关系描述理论是一个各模型有严密逻辑关联的统一体,以求对现有描述理论做出改进。 相似文献
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Place invaders: Identity,place attachment and possum control in the South Island West Coast of New Zealand 下载免费PDF全文
下载免费PDF全文 The pesticide 1080 (sodium fluoroacetate) is used in New Zealand as the primary means of controlling the Australian brushtail possum, a problem pest. This study identified place and its role in identity as an important mediator of the perspectives of those that either strongly supported or opposed its use. Individuals' differing constructions of place influenced the way they perceived ‘others’ as a threat to their place and their views on control of its management and protection. This study may contribute to a new understanding of the importance of place in this and other similar natural resource disputes. 相似文献
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绿色社区可持续发展评价指标体系构建 总被引：3，自引：1，他引：3
从绿色社区的概念出发，结合可持续发展理念．探讨了绿色社区的内涵和评价的内容，提出了一组测评绿色社区可持续发展的评价指标体系。该组指标体系综合考虑了绿色社区的环境、资源及人与城市发展的需要和对未来发展的支撑，具有可操作性。 相似文献
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大连金州金石滩地学旅游资源景观美学评价与并发研究 总被引：4，自引：0，他引：4
金石滩风景结构具有“五海世界”特征,其主景是海蚀地貌奇观,分布有众多具有相应造型的天然雕塑和抽象壁画。本文对该风景区的三层性结构进行景观美学分析,提供了一个地学和美学交叉的案例研究,并论证该旅游区的综合发展要求。 相似文献
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大连金州金石滩地学旅游资源景观美学评价与并发研究 总被引：1，自引：0，他引：1
金石滩风景结构具有“五海世界”特征,其主景是海蚀地貌奇观,分布有众多具有相应造型的天然雕塑和抽象壁画。本文对该风景区的三层性结构进行景观美学分析,提供了一个地学和美学交叉的案例研究,并论证该旅游区的综合发展要求, 相似文献
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空问数据分类分级表达是GIS最基本的功能之一.针对目前GIS中空间数据表达的不足,借鉴Frederico.T等学者关于本体驱动的地理信息系统中类的变化类型及其变化机制的思想,将土地利用中类的变化分为垂直导航和水平导航2种类型.利用OWL描述的地理数据分类等级体系中的一个概念导航到其父概念或子概念,通过合并地理本体中的某个地理概念的所有子概念所关联的地理要素类中的要素,实现地理空间数据内容的复合;通过将地理本体中的某个地理概念所关联的地理要素类中的要素分别归类到其子概念所关联的要素类中,实现地理空间数据内容的特化.基于本体方法研究地理数据分类分级表达是对目前地理空间数据可视化表达方法的有益补充和丰富. 相似文献
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地理学的实证主义方法论——评《地理学中的解释》 总被引：4，自引：0，他引：4
一门科学的独立性,除了取决于其特定研究对象——即研究什么——外,还必须依赖其方法论——即如何研究。各门科学在发展过程中无不关注这两个方面的深入和提高,地理学也不例外。 相似文献
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印度是世界上仅次于中国的第二人口大国，同时也是个发展中大国，经济并不富裕。近几十年来印度人口的过度增长，对其国家现今的政治稳定和经济发展带来了巨大沉重的压力，并影响着印度综合国力和人民生活水平的提高。本文在阐述印度人口结构、区域分布等地理特征的基础上，分析了印度人口特征对经济发展的影响，指出印度解决人口问题的当务之急是控制人口和大力发展经济。 相似文献
13.
An oases dynamics model and its application in the Manas oasis 总被引：2，自引：0，他引：2
This study applies theories of systems and system dynamics to ecological economic systems in the oasis environment, with the
intention of finding the basic characteristics of the oasis environment and its feedback structures. This study explores the
inner mechanisms of economic development in the oasis environment and its relationship to policy variables. This model is
applied to economic development in the Manas oasis of the Xinjiang Uygur Autonomous Region of China. System dynamics method
starts from studying feedback structure within the system study and then searches for the best solution through identifying
the right “policy point” and through model simulation in the computer. It embodies the cream of “systems cybernetics theory”.
This study is justified because the nature of the oasis system and the simulation results are scientifically sound and practically
feasible. 相似文献
14.
This study applies theories of systems and system dynamics to ecological economic systems in the oasis environment, with the intention of finding the basic characteristics of the oasis environment and its feedback structures. This study explores the inner mechanisms of economic development in the oasis environment and its relationship to policy variables. This model is applied to economic development in the Manas oasis of the Xinjiang Uygur Autonomous Region of China. System dynamics method starts from studying feedback structure within the system study and then searches for the best solution through identifying the right "policy point" and through model simulation in the computer. It embodies the cream of "systems cybernetics theory". This study is justified because the nature of the oasis system and the simulation results are scientifically sound and practically feasible. 相似文献
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Brooke Wilmsen 《Urban geography》2018,39(3):345-366
Over the next two decades, China, the country with the world’s largest urban population, is orchestrating the urbanization of some 300 million rural people. In its National New-Type Urbanization Plan (2014) the State Council has outlined a range of strategies to grow its cities not least of which is rural-to-urban migration. This plan will have significant effects on other types of displacement, particularly, the forced displacement and resettlement of those living in the path of large dams. This paper reviews what is known about New-Type Urbanization Approach to Reservoir Resettlement. Then, based on a longitudinal study of 145 resettled households at the Three Gorges Dam, the livelihood effects of rural-to-urban resettlement are unpacked to provide lessons for its use in advancing urbanization. It finds that rural-to-urban resettlers have lower incomes than their urban-to-urban and rural-to-rural counterparts, and higher rates of food and income insecurity. 相似文献
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庐山是我国著名的风景区，自然风光秀丽，人文紧观也很丰富。文章通过对庐山别墅群的形成背景以及其建筑特色的分析，揭示了庐山别墅群特有的文化底蕴和丰富的人文旅游资源，并根据别墅群的分布和规划特点，评价了其旅游价值，对别墅群作为旅游资源开发提出几点建议，以增加庐山旅游的内涵，实现其可持续利用。 相似文献
18.
Fei Hongping 《地理学报(英文版)》1994,(Z1)
I.MdjorAI)I)roacI1esThege0graPhyofenterprise,nane1ycorpOrategeograPhy,isabranchofecon0micgeographywhichdiscussesthespatialbehaviourofbusinesscooprationswithspecia1emphasis0nfirm-environl11e11ti11terdependc11cics,andare1ative1yl1e\vmicro-1evelanalytica1approachinecol1ol11icssu9up11}'.:f`col1.ldcl'ablel1ul1lbcI0rstudieswhichin0neWayoranotherincorporated"enterprise"asadimensioninindustrialandregi0nalec0nomicanalysisareintegra1tocontemp0raryempiric31industl-iallocati0l1researcll.Tl1el110sttypi… 相似文献
19.
陈国阶 《云南地理环境研究》1991,3(1):46-57
本文是继三峡工程对生态与环境影响的综合评价之后,针对三峡工程兴建与否和何时兴建等目标的延续课题。继承前期研究综合评价的基本框架。分为评价对象系统;时间动态系统;影响识别系统。包括3个次系统,23个子系统、100个评价因子的巨型系统工程。假设不同的变化条件,评价因子、因素和系统,在不同时间内的生态环境状况与理想状态的位差和生态的可能变化趋势,作出预警。 相似文献
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