The land-use information system (LUIS) is a special geographical information system developed under the support of the geographical information system (GIS). It effectively combines the quantitative analysis with spac...The land-use information system (LUIS) is a special geographical information system developed under the support of the geographical information system (GIS). It effectively combines the quantitative analysis with space analysis, mixes the feature of the land-use data and figure de scription, achieves the mutual transfer of the data and figure, and provides some effective methods for the quantitative research and space analysis. The targets, methods and procedures of the overall design of LUIS and its structure function and characteristic are presented in this paper. It pro vides the guide and references for developing the special GIS suitable for the demand of land-use management.展开更多
By integrating the merits of the map overlay method and the geographic information system (GIS), a GIS based map overlay method was developed to analyze comprehensively the environmental vulnerability around railway a...By integrating the merits of the map overlay method and the geographic information system (GIS), a GIS based map overlay method was developed to analyze comprehensively the environmental vulnerability around railway and its impact on the environment, which is adapted for the comprehensive assessment of railway environmental impact and the optimization of railway alignments. The assessment process of the GIS based map overlay method was presented, which includes deciding the system structure and weights of assessment factors, making environmental vulnerability grade maps, and evaluating the alternative alignments comprehensively to obtain the best one. With the GIS functions of spatial analysis, such as overlay analysis and buffer analysis, and functions of handling attribute data, the GIS based map overlay method overcomes the shortcomings of the existing map overlay method and the conclusion is more reasonable. In the end, a detailed case study was illustrated to verify the efficiency of the method.展开更多
With the actuality and characteristic and requirement of rural power enterprise distribution network management, this article introduced the function of geographic information system on the framework of distribution n...With the actuality and characteristic and requirement of rural power enterprise distribution network management, this article introduced the function of geographic information system on the framework of distribution network, in order to develop rural distribution network.展开更多
Geographic Information Systems(GIS) can be successfully introduced as a tool to manage water system infrastructures.This technology was taken into consideration after the local authorities’ estimation for almost 30%l...Geographic Information Systems(GIS) can be successfully introduced as a tool to manage water system infrastructures.This technology was taken into consideration after the local authorities’ estimation for almost 30%losses in the water distribution networks in cities.The major issue of water shortage in展开更多
In the past decade,the e-government affairs keep developing,which prom otes the reform of governmental affairs and the enhancement of administrative efficiency.However,the phenomenon of inform ation silo has bad influ...In the past decade,the e-government affairs keep developing,which prom otes the reform of governmental affairs and the enhancement of administrative efficiency.However,the phenomenon of inform ation silo has bad influence upon the governm ental information resources sharing and the efficiency of the e-government affairs,hindering inform ation connectivity,so that the government management cannot meet the need of society,nor can the e-governm ent develop in the long run.This paper attempts to analyze the embodiment and causes of the phenomenon of information silo,putting forward measures of solving the problem of inform ation silo.展开更多
Outdoor thermal environment prediction and evaluation system was established based on a geographic information system. The system uses digital elevation model data and satellite imagery of mountainous towns. The syste...Outdoor thermal environment prediction and evaluation system was established based on a geographic information system. The system uses digital elevation model data and satellite imagery of mountainous towns. The system can conveniently provide a three-dimensional view of a town as well as predict the urbanization rate and urban heat island intensity. In addition,the system also permits quick inquiry and analysis of the temperature field,moisture field,and wind field tendency and current conditions of towns. The system was tested using the town of Yunyang,Chongqing Municipality,China,as a case study. The system was used to analyze and predict the climate comfort of the entire town and the outdoor thermal environment comfort of certain town districts,squares and streets. The results are in accordance with the measured data. This outdoor thermal environment prediction and evaluation method thus can provide a feasible reference for the general plan of mountainous town and promote the sustainable development of mountainous towns.展开更多
An orthogonal wavelet transform fractionally spaced blind equalization algorithm based on the optimization of genetic algorithm(WTFSE-GA) is proposed in viewof the lowconvergence rate,large steady-state mean square er...An orthogonal wavelet transform fractionally spaced blind equalization algorithm based on the optimization of genetic algorithm(WTFSE-GA) is proposed in viewof the lowconvergence rate,large steady-state mean square error and local convergence of traditional constant modulus blind equalization algorithm(CMA).The proposed algorithm can reduce the signal autocorrelation through the orthogonal wavelet transform of input signal of fractionally spaced blind equalizer,and decrease the possibility of CMA local convergence by using the global random search characteristics of genetic algorithm to optimize the equalizer weight vector.The proposed algorithm has the faster convergence rate and smaller mean square error compared with FSE and WT-FSE.The efficiency of the proposed algorithm is proved by computer simulation of underwater acoustic channels.展开更多
With the development in network communication, the research and application of “virtual city” has become an important discussion item. The crucial point lies on how to set up a virtual visual model of city on Intern...With the development in network communication, the research and application of “virtual city” has become an important discussion item. The crucial point lies on how to set up a virtual visual model of city on Internet; it is the organic integration of computer science, information science, geosciences and system science. This text summarizes the basic conception of “digital earth/the virtual fictitious city”, and probes into the technology of combining with Web on the basis of 2DVR, 3DVR and GIS. It develops the new emulation mode of the virtual urban system and key technology while developing the scheme wholly. This paper offers the interactive methods of the virtual world and outside world. The method of using the panorama, three dimensional model and active server pages technology to realize interactive network virtual city roam is studied and a running example is given. Using the system we can offer the visual brand-new technical support for urban planning, traffic for tourism, etc.展开更多
对湖北田歌的分布与田歌孕育的地理环境之间的关系进行了探究,以期为区域音乐的实证研究提供新的思路和方法.以湖北田歌为研究对象,选取1 248个田歌样本数据集,运用地理信息系统(geographic information system,GIS)对初步选定的田歌分...对湖北田歌的分布与田歌孕育的地理环境之间的关系进行了探究,以期为区域音乐的实证研究提供新的思路和方法.以湖北田歌为研究对象,选取1 248个田歌样本数据集,运用地理信息系统(geographic information system,GIS)对初步选定的田歌分布及音乐要素影响因子进行建库,基于随机森林及可解释性算法(shapley additive explanations,SHAP)构建田歌影响因子体系分析模型,通过受试者工作特性曲线(receiver operating characteristic curve,ROC)对模型的有效性进行评价,分析田歌的分布、音乐要素与地理环境之间的关系.研究结果表明:1)基于随机森林构建的田歌影响因子体系模型预测效果较好,其曲线下面积(area under the curve,AUC)的值为0.82;2)对田歌产生及音乐要素影响因子重要性排序得出,多年平均降雨量和多年平均气温是孕育湖北田歌的主要因子.其随机森林及SHAP算法,能在一定程度上预测湖北田歌分布格局,对区域音乐文化与地理关联性研究具有重要意义.展开更多
陆地表面温度(LST)是全球和区域尺度地表物理过程的关键参数,维持地气相互作用过程中物质与能量交换平衡。本文基于GIS/RS技术,结合MODIS 8 d LST遥感数据产品(MOD11A2),利用分裂窗算法,通过月合成和年合成构建出福建省2000-2016年长时...陆地表面温度(LST)是全球和区域尺度地表物理过程的关键参数,维持地气相互作用过程中物质与能量交换平衡。本文基于GIS/RS技术,结合MODIS 8 d LST遥感数据产品(MOD11A2),利用分裂窗算法,通过月合成和年合成构建出福建省2000-2016年长时序地表温度数据集。然后对月合成和年合成的长时间序列LST数据进行分析并探讨了LST的分布及其反演特征。结果表明,福建省的LST约在7月达到最高,约在1月为最低。自2000-2016年福建省的LST呈周期性变化(似于正弦曲线)。空间分布上,福建省的LST空间分布也存在着明显的西低东高、南暖北冷。随着福建省沿海地区经济的快速发展和城市化不断发展,沿海城市地区的LST明显高于山区农村地区。LST分布可能受到气候、地形和土地覆盖类型的影响,地理信息技术分析LST的时空分布特征可以为福建省的区域生态环境保护、可持续发展政策的制定及农作物科学合理区划提供重要的参考依据,最终构建一套较完整的、效果较好的LST时间序列数据集。展开更多
文摘The land-use information system (LUIS) is a special geographical information system developed under the support of the geographical information system (GIS). It effectively combines the quantitative analysis with space analysis, mixes the feature of the land-use data and figure de scription, achieves the mutual transfer of the data and figure, and provides some effective methods for the quantitative research and space analysis. The targets, methods and procedures of the overall design of LUIS and its structure function and characteristic are presented in this paper. It pro vides the guide and references for developing the special GIS suitable for the demand of land-use management.
文摘By integrating the merits of the map overlay method and the geographic information system (GIS), a GIS based map overlay method was developed to analyze comprehensively the environmental vulnerability around railway and its impact on the environment, which is adapted for the comprehensive assessment of railway environmental impact and the optimization of railway alignments. The assessment process of the GIS based map overlay method was presented, which includes deciding the system structure and weights of assessment factors, making environmental vulnerability grade maps, and evaluating the alternative alignments comprehensively to obtain the best one. With the GIS functions of spatial analysis, such as overlay analysis and buffer analysis, and functions of handling attribute data, the GIS based map overlay method overcomes the shortcomings of the existing map overlay method and the conclusion is more reasonable. In the end, a detailed case study was illustrated to verify the efficiency of the method.
基金Science and Technology Research Instruction Project of Heilongjiang Province Education Department (9553032)
文摘With the actuality and characteristic and requirement of rural power enterprise distribution network management, this article introduced the function of geographic information system on the framework of distribution network, in order to develop rural distribution network.
文摘Geographic Information Systems(GIS) can be successfully introduced as a tool to manage water system infrastructures.This technology was taken into consideration after the local authorities’ estimation for almost 30%losses in the water distribution networks in cities.The major issue of water shortage in
文摘In the past decade,the e-government affairs keep developing,which prom otes the reform of governmental affairs and the enhancement of administrative efficiency.However,the phenomenon of inform ation silo has bad influence upon the governm ental information resources sharing and the efficiency of the e-government affairs,hindering inform ation connectivity,so that the government management cannot meet the need of society,nor can the e-governm ent develop in the long run.This paper attempts to analyze the embodiment and causes of the phenomenon of information silo,putting forward measures of solving the problem of inform ation silo.
基金Project(50838009) supported by the National Natural Science Foundation of ChinaProjects(2006BAJ02A09, 2006BAJ02A13-4) supported by the National Key Technology R&D ProgramProject(200909A1001) supported by Chongqing University Postgraduates Innovative Team Fund
文摘Outdoor thermal environment prediction and evaluation system was established based on a geographic information system. The system uses digital elevation model data and satellite imagery of mountainous towns. The system can conveniently provide a three-dimensional view of a town as well as predict the urbanization rate and urban heat island intensity. In addition,the system also permits quick inquiry and analysis of the temperature field,moisture field,and wind field tendency and current conditions of towns. The system was tested using the town of Yunyang,Chongqing Municipality,China,as a case study. The system was used to analyze and predict the climate comfort of the entire town and the outdoor thermal environment comfort of certain town districts,squares and streets. The results are in accordance with the measured data. This outdoor thermal environment prediction and evaluation method thus can provide a feasible reference for the general plan of mountainous town and promote the sustainable development of mountainous towns.
基金Sponsored by the Nature Science Foundation of Jiangsu(BK2009410)
文摘An orthogonal wavelet transform fractionally spaced blind equalization algorithm based on the optimization of genetic algorithm(WTFSE-GA) is proposed in viewof the lowconvergence rate,large steady-state mean square error and local convergence of traditional constant modulus blind equalization algorithm(CMA).The proposed algorithm can reduce the signal autocorrelation through the orthogonal wavelet transform of input signal of fractionally spaced blind equalizer,and decrease the possibility of CMA local convergence by using the global random search characteristics of genetic algorithm to optimize the equalizer weight vector.The proposed algorithm has the faster convergence rate and smaller mean square error compared with FSE and WT-FSE.The efficiency of the proposed algorithm is proved by computer simulation of underwater acoustic channels.
文摘With the development in network communication, the research and application of “virtual city” has become an important discussion item. The crucial point lies on how to set up a virtual visual model of city on Internet; it is the organic integration of computer science, information science, geosciences and system science. This text summarizes the basic conception of “digital earth/the virtual fictitious city”, and probes into the technology of combining with Web on the basis of 2DVR, 3DVR and GIS. It develops the new emulation mode of the virtual urban system and key technology while developing the scheme wholly. This paper offers the interactive methods of the virtual world and outside world. The method of using the panorama, three dimensional model and active server pages technology to realize interactive network virtual city roam is studied and a running example is given. Using the system we can offer the visual brand-new technical support for urban planning, traffic for tourism, etc.
文摘对湖北田歌的分布与田歌孕育的地理环境之间的关系进行了探究,以期为区域音乐的实证研究提供新的思路和方法.以湖北田歌为研究对象,选取1 248个田歌样本数据集,运用地理信息系统(geographic information system,GIS)对初步选定的田歌分布及音乐要素影响因子进行建库,基于随机森林及可解释性算法(shapley additive explanations,SHAP)构建田歌影响因子体系分析模型,通过受试者工作特性曲线(receiver operating characteristic curve,ROC)对模型的有效性进行评价,分析田歌的分布、音乐要素与地理环境之间的关系.研究结果表明:1)基于随机森林构建的田歌影响因子体系模型预测效果较好,其曲线下面积(area under the curve,AUC)的值为0.82;2)对田歌产生及音乐要素影响因子重要性排序得出,多年平均降雨量和多年平均气温是孕育湖北田歌的主要因子.其随机森林及SHAP算法,能在一定程度上预测湖北田歌分布格局,对区域音乐文化与地理关联性研究具有重要意义.
文摘陆地表面温度(LST)是全球和区域尺度地表物理过程的关键参数,维持地气相互作用过程中物质与能量交换平衡。本文基于GIS/RS技术,结合MODIS 8 d LST遥感数据产品(MOD11A2),利用分裂窗算法,通过月合成和年合成构建出福建省2000-2016年长时序地表温度数据集。然后对月合成和年合成的长时间序列LST数据进行分析并探讨了LST的分布及其反演特征。结果表明,福建省的LST约在7月达到最高,约在1月为最低。自2000-2016年福建省的LST呈周期性变化(似于正弦曲线)。空间分布上,福建省的LST空间分布也存在着明显的西低东高、南暖北冷。随着福建省沿海地区经济的快速发展和城市化不断发展,沿海城市地区的LST明显高于山区农村地区。LST分布可能受到气候、地形和土地覆盖类型的影响,地理信息技术分析LST的时空分布特征可以为福建省的区域生态环境保护、可持续发展政策的制定及农作物科学合理区划提供重要的参考依据,最终构建一套较完整的、效果较好的LST时间序列数据集。
