Recently, ontological study has been one of the key concerns of geographic information science, a number of studies have been conducted in both of philosophical and knowledge engineering approach. Some studies pointed...Recently, ontological study has been one of the key concerns of geographic information science, a number of studies have been conducted in both of philosophical and knowledge engineering approach. Some studies pointed out the importance of human cognition and social context for development of ontologies. This paper presents empirical investigation of common sense of land use categories for development of suitable ontologies for each cultural or speech communities. Distinctions and characteristics in perceiving land use categories were described by a psychological method that was submitted to Japanese graduate and undergraduate students. In addition the results were analyzed using corresponddence analysis, a statistical technique for categorical data. This analysis serves to clarify the dominant determining factors for land use categories.展开更多
利用高精度的土地覆盖、土壤质地类型和地形高度值替换了天气研究和预报模式Weather Research and Forecasting Model(WRF)中的相关数据,通过数值模式试验检验了下垫面数据对WRF模拟精度的影响。同时,通过与黑河综合遥感联合试验中7个...利用高精度的土地覆盖、土壤质地类型和地形高度值替换了天气研究和预报模式Weather Research and Forecasting Model(WRF)中的相关数据,通过数值模式试验检验了下垫面数据对WRF模拟精度的影响。同时,通过与黑河综合遥感联合试验中7个测站观测数据的比较,以平均误差、均方根误差和相关系数为指标,分析了WRF模式下垫面数据改变对近地表气象要素的模拟精度的影响。结果表明:(1)WRF模式本身的地形高度信息在黑河流域上游地区有较大误差,造成了一定的模拟误差。而使用高精度的下垫面数据可以提高WRF模式在黑河流域上游复杂区域的模拟能力;(2)2m气温除了随地形高度递减外,还受土壤质地和土地覆盖小幅度影响,而且进行地形订正后的2m气温与2m湿度的模拟在下垫面为水体的区域对比强烈,因此为模式提供准确的水体分布信息也至关重要;(3)2m气温和湿度等要素的模拟差异值与地形高度资料的差异呈负相关,而降雨量的差异与地形高度差异呈微弱的正相关,与土壤质地差异和土地覆盖差异的相关性也比较弱。展开更多
提出一种实用性较强的地理信息语义表达及相似性度量模型,实现从地理信息语义建模到相似性度量的完整技术链条。在对地理信息语义表达的内容与尺度分析的基础上,提出地理信息语义描述的基本结构,并将其进一步细化为具有不同大小的语义...提出一种实用性较强的地理信息语义表达及相似性度量模型,实现从地理信息语义建模到相似性度量的完整技术链条。在对地理信息语义表达的内容与尺度分析的基础上,提出地理信息语义描述的基本结构,并将其进一步细化为具有不同大小的语义粒度项,以构建出地理信息语义的细节层次(level of detail,LOD)表达模型,最后依据地理信息概念间相关语义粒度项的匹配关系实现地理信息语义相似程度的定量化计算,在实例分析中则以土地利用类型为例进行相似度计算的实验,通过实验结果与实际经验判断比较验证出该模型具有较强的实用性。展开更多
With a mesoscale model (MM5) nested with the global spectral model of NationalMeteorological Center/CMA and especially with the forecast experiments as to rainfall andtemperature of twenty-seven sampling stations in E...With a mesoscale model (MM5) nested with the global spectral model of NationalMeteorological Center/CMA and especially with the forecast experiments as to rainfall andtemperature of twenty-seven sampling stations in East China for six months (February, March,April in 1997 and June, July, August in 1998), it has been found that the better prediction can beperformed on the condition that the surface physical process of practical land-use categories andphysical parameters is parameterized in particular forecast domain. limited-area model, land-use category, forecast展开更多
文摘Recently, ontological study has been one of the key concerns of geographic information science, a number of studies have been conducted in both of philosophical and knowledge engineering approach. Some studies pointed out the importance of human cognition and social context for development of ontologies. This paper presents empirical investigation of common sense of land use categories for development of suitable ontologies for each cultural or speech communities. Distinctions and characteristics in perceiving land use categories were described by a psychological method that was submitted to Japanese graduate and undergraduate students. In addition the results were analyzed using corresponddence analysis, a statistical technique for categorical data. This analysis serves to clarify the dominant determining factors for land use categories.
文摘利用高精度的土地覆盖、土壤质地类型和地形高度值替换了天气研究和预报模式Weather Research and Forecasting Model(WRF)中的相关数据,通过数值模式试验检验了下垫面数据对WRF模拟精度的影响。同时,通过与黑河综合遥感联合试验中7个测站观测数据的比较,以平均误差、均方根误差和相关系数为指标,分析了WRF模式下垫面数据改变对近地表气象要素的模拟精度的影响。结果表明:(1)WRF模式本身的地形高度信息在黑河流域上游地区有较大误差,造成了一定的模拟误差。而使用高精度的下垫面数据可以提高WRF模式在黑河流域上游复杂区域的模拟能力;(2)2m气温除了随地形高度递减外,还受土壤质地和土地覆盖小幅度影响,而且进行地形订正后的2m气温与2m湿度的模拟在下垫面为水体的区域对比强烈,因此为模式提供准确的水体分布信息也至关重要;(3)2m气温和湿度等要素的模拟差异值与地形高度资料的差异呈负相关,而降雨量的差异与地形高度差异呈微弱的正相关,与土壤质地差异和土地覆盖差异的相关性也比较弱。
文摘提出一种实用性较强的地理信息语义表达及相似性度量模型,实现从地理信息语义建模到相似性度量的完整技术链条。在对地理信息语义表达的内容与尺度分析的基础上,提出地理信息语义描述的基本结构,并将其进一步细化为具有不同大小的语义粒度项,以构建出地理信息语义的细节层次(level of detail,LOD)表达模型,最后依据地理信息概念间相关语义粒度项的匹配关系实现地理信息语义相似程度的定量化计算,在实例分析中则以土地利用类型为例进行相似度计算的实验,通过实验结果与实际经验判断比较验证出该模型具有较强的实用性。
文摘With a mesoscale model (MM5) nested with the global spectral model of NationalMeteorological Center/CMA and especially with the forecast experiments as to rainfall andtemperature of twenty-seven sampling stations in East China for six months (February, March,April in 1997 and June, July, August in 1998), it has been found that the better prediction can beperformed on the condition that the surface physical process of practical land-use categories andphysical parameters is parameterized in particular forecast domain. limited-area model, land-use category, forecast
