Formulating a General Spatial Segregation Measure*     

David W. Wong 《The Professional geographer》2005,57(2):285-294

Most traditional segregation measures, such as the index of dissimilarity D, fail to distinguish spatial patterns effectively. Previously proposed spatial measures modifying D suffer from several shortcomings. This article describes a general spatial segregation index based upon the concept of composite population counts, which are derived from grouping people in neighboring areas together to account implicitly for spatial interaction of groups across unit boundaries. The suggested spatial index can overcome the disadvantages of previous indices and can assess the spatial extent of the segregated clusters. The results offer a more comprehensive depiction of spatial segregation of a region.  相似文献   

Changing Faces,Changing Places: Mapping Southern Californians     

《The Professional geographer》2005,57(3):485-488

  相似文献   

不同生境条件下泡泡刺(Nitraria sphaerocarpa)种群的空间格局及动态分析   总被引：12，自引：13，他引：12  

李秋艳  何志斌  赵文智  李启森 《中国沙漠》2004,24(4):484-488

应用生态空间理论(theory of spatial ecology)和地统计技术，分析了不同生境条件下泡泡刺种群的空间分布特征及其动态。结果表明：受气候条件的控制，泡泡刺种群是以斑块状格局形式存在。在较小的尺度上，生境条件起到了明显的作用，戈壁生境中的泡泡刺灌丛沙堆趋向于斑块小、密度大、空间自相关距离短，而沙漠生境中的结果相反。另外，沙埋和地下水位下降不仅为泡泡刺种群拓宽了生态位，而且是该种群演化的驱动力。  相似文献   

The quality and qualities of population statistics, and the place of the census     

Len Cook 《Area》2004,36(2):111-123

Population counts are a key anchor for much of the official statistical system and the benchmark for many commercial and research surveys and analysis. Statistical offices around the world face a wide range of challenges in counting their population, most particularly in the years between censuses, as population flows become much freer and family structures continue to evolve. This paper considers these issues, reviewing how population counts have evolved over time in the UK and other countries. The paper also looks to the future, considering ways in which population count methodology might develop.  相似文献   

论空间信息多级格网及其典型应用   总被引：24，自引：7，他引：24  

李德仁  邵振峰  朱欣焰 《武汉大学学报(信息科学版)》2004,29(11):945-950

探求适合网格计算环境下空间信息多级格网SIMG(spatialinformationmulti grid)的新概念及其表达的新方法 ,阐述了SIMG潜在的三大职能 ,剖析了SIMG面临的诸多挑战 ,研究了SIMG的技术体系结构 ,并以国家人口统计和经济数据统计为目标 ,设计一个带空间信息编码的人口普查多级格网 ,用于研究SIMG的应用设计方案 ,力求为空间信息的共享和服务找到一种有效的新途径  相似文献   

人口地理信息系统的研制   总被引：4，自引：0，他引：4  

何宗宜  贾凉 《地理空间信息》2005,3(2):3-5

提出了人口地理信息系统的层次结构、功能,并对人口地理信息系统的研制进行了详细的探讨。  相似文献   

A Simplified Approach to Earthquake Risk in Mainland China     

Qi-fu Chen  Hongliang MI  Jing Huang 《Pure and Applied Geophysics》2005,162(6-7):1255-1269

There are limitations in conventional earthquake loss procedures if attempts are made to apply these to assess the social and economic impacts of recent disastrous earthquakes. This paper addresses the need to develop an applicable model for estimating the significant increases of earthquake loss in mainland China. The casualties of earthquakes were studied first. The casualties of earthquakes are strongly related to earthquake strength, occurrence time (day or night) and the distribution of population in the affected area. Using data on earthquake casualties in mainland China from 1980 to 2000, we suggest a relationship between average losses of life and the magnitude of earthquakes. Combined with information on population density and earthquake occurrence times, we use these data to give a further relationship between the loss of life and factors like population density, intensity and occurrence time of the earthquake. Earthquakes that occurred from 2001 to 2003 were tested for the given relationships. This paper also explores the possibility of using a macroeconomic indicator, here GDP (Gross Domestic Product), to roughly estimate earthquake exposure in situations where no detailed insurance or similar inventories exist, thus bypassing some problems of the conventional method.  相似文献   

The cities of Russia: some recent trends and experience of regional and urban planning     

Dmitri Piterski 《GeoJournal》1997,43(4):385-388

The author examines the recent situation in the development of cities in Russia. Recent trends include a lack of growth and even a decrease in population; extensive economic restructuring; a grave ecological situation in cities; and recent peculiarities in the geopolitical situation and population migration. Due to the new economic, demographic, geopolitical and social situation in Russia it is necessary to re-evaluate the prospects for the development and growth of the big cities in this country. The system of basic documents for regional and city planning in the former USSR and in Russia includes different stages: from The General Scheme for the Settlement Systems of the Country and The Regional Territorial Complex Schemes of Environmental Protection in different regions to the detailed plans for the different parts of cities and towns. The shortcomings of this system and in the process of the realization of the schemes of regional planning and general plans for cities are documented.  相似文献   

全球人口增长及其地质环境变化   总被引：1，自引：0，他引：1       下载免费PDF全文

晏同珍 《地球科学》1995,20(5):563-569

论述了全球人口及城市人口增长与发展的基本规律，根据历史记录数据建立了其预测指数方程，预测结果表明，２１世纪５０年代全球人口将超过１００亿；且其城市人口将于２０２５年发展为７９亿。论证了人口高速增长与全球地质环境变化紧密相关。讨论了农业地质环境变化－谷物供应问题以及可耕土地资源减少和水土资源流失、沙漠膜问题及工业矿产、能源、资源与水资源紧缺以及其地质环境变化问题。相应于地质环境变化问题建立了预测方程  相似文献   

一个面向未来的历史性选择：—我国资源,环境问题与持续发展     

黄鼎成 《水文地质工程地质》1993,20(1):5-8

文章概述了我国正以历史上最为严峻的资源、环境状况,承载着历史上最多的人口群及其最大的活动能力。初步探讨了持续发展的必然选择。  相似文献