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文摘
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山地和山区范围的界定是山区数据库建设和数字山地战略实施的基础.该文在GIS空间分析和数理统计分析技术的支持下,选取高程、道路密度、林草地比例、耕地比例、人口密度和GDP 6个因子,通过构建基于栅格单元的边缘生长模型,计算非山地的栅格单元被划分为山区的概率,并设定一个阈值以区分山区和非山区,在湖南省山地范围的基础上探讨其山区范围的划分.计算得到湖南省山区面积占总面积的64.52%,相对于山地面积增长了43.47%,且将原本孤立的山地连接成片,山区更具连续性和完整性. |
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其他语种文摘
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Mountain and mountainous area are two important concepts which are similar but different in fact.Mountain emphasizes the natural environment and has a clear and definite boundary,while mountainous area focuses on the socio-economic phenomenon and the range of it is indistinct and uncertain.The quantification of mountains and mountainous areas is foundational work for the establishment of mountainous area databases and Digital Mountain.Supported by the spatial analysis functions in geographical information system (GIS) and the statistical analysis,an edge growing model(EGM) was built up to discuss mountainous areas in Hunan Province based on the area of mountains.The probability of mountainous area determination was calculated for each non-mountain cell on the basis of natural environment factors and socio-economic factors,including elevation,road density,forest-grass land proportion,cultivated land proportion,population density and GDP.A threshold of the probability was also set to differentiate mountainous area from non-mountainous area,and consequently mountainous areas could be generated around mountain cells.As a result,mountainous areas of Hunan Province was 64.52% of the total area,which was 43.47% more than mountains.The cause of such increase was analyzed,it turned out that the dispersed distribution of mountains and high percentage of forest-grass land in non-mountain area were the two main reasons. |
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来源
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地理与地理信息科学
,2010,26(1):59-62,77 【扩展库】
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关键词
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湖南
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山区
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山地
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数字山地
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地理信息系统
;
数理统计
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地址
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中国科学院水利部成都山地灾害与环境研究所, 四川, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-0504 |
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学科
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测绘学;自然地理学 |
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基金
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中国科学院西部之光人才培养计划
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国家973计划
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国家科技支撑计划项目
;
中国科学院水利部成都山地灾害与环境研究所知识创新工程前沿项目
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文献收藏号
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CSCD:3803290
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