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一种判断类间空间分布情形的有效方法
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作者 薛欣 贺国平 《计算机工程与设计》 CSCD 北大核心 2007年第13期3031-3032,3050,共3页
层次结构设计是层次支持向量机应用中的关键问题,不同层次结构下,层次支持向量机的分类性能有很大差别。分析了层次支持向量机及其存在的问题,提出了一种有效判断类间空间分布情形的简单方法。仿真试验表明,基于该方法设计的层次支持向... 层次结构设计是层次支持向量机应用中的关键问题,不同层次结构下,层次支持向量机的分类性能有很大差别。分析了层次支持向量机及其存在的问题,提出了一种有效判断类间空间分布情形的简单方法。仿真试验表明,基于该方法设计的层次支持向量机与基于传统方法设计的层次支持向量机相比,具有较高的分类精度。 展开更多
关键词 类间空间分布 层次结构 支持向量机 层次支持向量机
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A Functional Land Use Classification for Ecological, Production and Living Spaces in the Taihang Mountains 被引量:14
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作者 GENG Shoubao ZHU Wanrui SHI Peili 《Journal of Resources and Ecology》 CSCD 2019年第3期246-255,共10页
A combination of rapid industrialization, economic development and urbanization has caused a series of issues such as resource shortages, ecosystem destruction, environmental pollution and tension between human needs ... A combination of rapid industrialization, economic development and urbanization has caused a series of issues such as resource shortages, ecosystem destruction, environmental pollution and tension between human needs and land conservation. In order to promote balanced development of human, resources, ecosystems, the environment, and the economy and society, it is vital to conceptualize ecological spaces, production spaces and living spaces. Previous studies of ecological-production-living spaces focused mainly on urban and rural areas; few studies have examined mountainous areas. The Taihang Mountains, a key area between the North China Plain and Beijing-Tianjin-Hebei area providing ecological shelter and the safeguarding of crucial water sources, suffer from increasing problems of fragile environment, inappropriate land use and tensions in the human-land relationship. However, studies of the ecological, production, and living spaces in the Taihang Mountains are still lacking. Therefore, this study, based on the concept of ecological-production-living spaces and using data from multiple sources, took the Taihang Mountains as the study area to build a functional land classification system for ecological-production-living spaces. After the classification system was in place, spatial distribution maps for ecological, production and living spaces were delineated. This space mapping not only characterized the present land use situation, but also established a foundation for future land use optimization. Results showed that the area of ecological space was 78,440 km^2, production space 51,861 km^2 and living space 6,646 km^2, accounting for 57.28%, 37.87% and 4.85% of the total area, respectively. Ecological space takes up the most area and is composed mainly of forests and grasslands. Additionally, most of the ecological space is located in higher elevation mountainous areas, and plays an important role in regulating and maintaining ecological security. Production space, mostly farmlands sustaining livelihoods inside and outside the region, is largely situated in lower elevation plains and hilly areas, as well as in low-lying mountainous basins. Living space has the smallest area and is concentrated mainly in regions with relatively flat terrain and convenient transportation for human settlements. 展开更多
关键词 ecological-production-living space la nd classificati on system la nd function spatial pattern the Taihang Mountains
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