To improve the current GIS functions in describing geographic objects with fuzziness,this paper begins with a discussion on the distance measure of spatial objects based on the theory of sets and an introduction of di...To improve the current GIS functions in describing geographic objects with fuzziness,this paper begins with a discussion on the distance measure of spatial objects based on the theory of sets and an introduction of dilation and erosion operators.Under the assumption that changes of attributes in a geographic region are gradual,the analytic expressions for the fuzzy objects of points,lines and areas,and the description of their formal structures are presented.The analytic model of geographic objects by means of fuzzy fields is developed.We have shown that the 9-intersection model proposed by Egenhofer and Franzosa (1991) is a special case of the model presented in the paper.展开更多
In the last century, there has been a significant development in the evaluation of methods to predict ground movement due to underground extraction. Some remarkable developments in three-dimensional computational meth...In the last century, there has been a significant development in the evaluation of methods to predict ground movement due to underground extraction. Some remarkable developments in three-dimensional computational methods have been supported in civil engineering, subsidence engineering and mining engineering practice. However, ground movement problem due to mining extraction sequence is effectively four dimensional （4D）. A rational prediction is getting more and more important for long-term underground mining planning. Hence, computer-based analytical methods that realistically simulate spatially distributed time-dependent ground movement process are needed for the reliable long-term underground mining planning to minimize the surface environmental damages. In this research, a new computational system is developed to simulate four-dimensional （4D） ground movement by combining a stochastic medium theory, Knothe time-delay model and geographic information system （GIS） technology. All the calculations are implemented by a computational program, in which the components of GIS are used to fulfill the spatial-temporal analysis model. In this paper a tight coupling strategy based on component object model of GIS technology is used to overcome the problems of complex three-dimensional extraction model and spatial data integration. Moreover, the implementation of computational of the interfaces of the developed tool is described. The GIS based developed tool is validated by two study cases. The developed computational tool and models are achieved within the GIS system so the effective and efficient calculation methodology can be obtained, so the simulation problems of 4D ground movement due to underground mining extraction sequence can be solved by implementation of the developed tool in GIS.展开更多
This paper studies an interdisciplinary subject of aesthetics andgeography-beautiful geography .Firsly,it expounds and proves theobjective existence of the beautiful geography from the aims and tasks,objects and cont...This paper studies an interdisciplinary subject of aesthetics andgeography-beautiful geography .Firsly,it expounds and proves theobjective existence of the beautiful geography from the aims and tasks,objects and contents of study in aesthetics and geography in relation totheir branch sciences.Secondly, it discusses the study objects and studycontents and nature of the beautiful geography.It concludes that studyobjects of beautiful geography is the beautifolness of geographic objects.The contents of study contain:1) aesthetic laws and principles of thegeographic objects and human experience to the geographic objects,2)aesthetic value and appraisal of the geographic objects, use of aestheticvalue of the geographic objects; 3) perceptional and behavior effction of the beatiful geographic objects along with its uses; and 4) beautification ofthe geographic objects and constructing beautiful geographic objects.Lastly, it investigates the significance and use of the beautiful geography,especially in distribution of production,urban planning, the appraisal ofresources and regionalization and planning and the construction of tourism.展开更多
基金agrantfromtheNationalNaturalScienceFoundationof China (No .4980 1 0 1 6)
文摘To improve the current GIS functions in describing geographic objects with fuzziness,this paper begins with a discussion on the distance measure of spatial objects based on the theory of sets and an introduction of dilation and erosion operators.Under the assumption that changes of attributes in a geographic region are gradual,the analytic expressions for the fuzzy objects of points,lines and areas,and the description of their formal structures are presented.The analytic model of geographic objects by means of fuzzy fields is developed.We have shown that the 9-intersection model proposed by Egenhofer and Franzosa (1991) is a special case of the model presented in the paper.
文摘In the last century, there has been a significant development in the evaluation of methods to predict ground movement due to underground extraction. Some remarkable developments in three-dimensional computational methods have been supported in civil engineering, subsidence engineering and mining engineering practice. However, ground movement problem due to mining extraction sequence is effectively four dimensional （4D）. A rational prediction is getting more and more important for long-term underground mining planning. Hence, computer-based analytical methods that realistically simulate spatially distributed time-dependent ground movement process are needed for the reliable long-term underground mining planning to minimize the surface environmental damages. In this research, a new computational system is developed to simulate four-dimensional （4D） ground movement by combining a stochastic medium theory, Knothe time-delay model and geographic information system （GIS） technology. All the calculations are implemented by a computational program, in which the components of GIS are used to fulfill the spatial-temporal analysis model. In this paper a tight coupling strategy based on component object model of GIS technology is used to overcome the problems of complex three-dimensional extraction model and spatial data integration. Moreover, the implementation of computational of the interfaces of the developed tool is described. The GIS based developed tool is validated by two study cases. The developed computational tool and models are achieved within the GIS system so the effective and efficient calculation methodology can be obtained, so the simulation problems of 4D ground movement due to underground mining extraction sequence can be solved by implementation of the developed tool in GIS.
文摘This paper studies an interdisciplinary subject of aesthetics andgeography-beautiful geography .Firsly,it expounds and proves theobjective existence of the beautiful geography from the aims and tasks,objects and contents of study in aesthetics and geography in relation totheir branch sciences.Secondly, it discusses the study objects and studycontents and nature of the beautiful geography.It concludes that studyobjects of beautiful geography is the beautifolness of geographic objects.The contents of study contain:1) aesthetic laws and principles of thegeographic objects and human experience to the geographic objects,2)aesthetic value and appraisal of the geographic objects, use of aestheticvalue of the geographic objects; 3) perceptional and behavior effction of the beatiful geographic objects along with its uses; and 4) beautification ofthe geographic objects and constructing beautiful geographic objects.Lastly, it investigates the significance and use of the beautiful geography,especially in distribution of production,urban planning, the appraisal ofresources and regionalization and planning and the construction of tourism.
