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DENG MinLI ChengmingLIU Wenbao 《地球空间信息科学学报》2001,4(4):43-48
1 ＩｎｔｒｏｄｕｃｔｉｏｎＳｐａｔｉａｌｒｅｌａｔｉｏｎｓｑｕｅｒｙｉｓｏｎｅｏｆｂａｓｉｃｆｕｎｃｔｉｏｎｓｉｎＧＩＳ’ｓａｐｐｌｉｃａｔｉｏｎ .ＭｏｓｔｏｆｃｕｒｒｅｎｔｃｏｍｍｅｒｃｉａｌＧＩＳｓｃａｎｏｎｌｙｑｕｅｒｙｓｐａｔｉａｌｒｅｌａｔｉｏｎｓｆｏｒｓｐａｔｉａｌｏｂ ｊｅｃｔｓｗｉｔｈｏｕｔａｎｙｅｒｒｏｒｏｒｕｎｃｅｒｔａｉｎｔｙ ,ｆｏｒｅｘａｍｐｌｅ ,ｔｏｕｓｅｃｏｍｐｕｔａｔｉｏｎ ｇｅｏｍｅｔｒｙａｌｇｏｒｉｔｈｍｔｏｄｅｔｅｒ ｍｉｎｅｗｈｅｔｈｅｒａｐｏｉｎｔｆａｌｌｓ… 相似文献
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Kimfung Liu Wenzhong Shi 《International Journal of Applied Earth Observation and Geoinformation》2009
This paper presents a study on the modeling of fuzzy topological relations between uncertain objects in Geographic Information Systems (GIS). Based on the recently developed concept of computational fuzzy topological space, topological relations between simple fuzzy spatial objects are modeled. The fuzzy spatial objects here cover simple fuzzy region, simple fuzzy line segment and fuzzy point. To compute the topological relations between the simple spatial objects, intersection concepts and integration methods are applied and a computational 9-intersection model are proposed and developed. There are different types of intersection, and we have proposed different integration methods for computation in different cases. For example, surface integration method is applied to the case of the fuzzy region-to-fuzzy region relation, while the line integration method is used in the case of fuzzy line segment-to-fuzzy line segment relation. Moreover, this study has discovered that there are (a) sixteen topological relations between simple fuzzy region to line segment; (b) forty-six topological relations between simple fuzzy line segments; (c) three topological relations between simple fuzzy region to fuzzy point; and (d) three topological relations between simple fuzzy line segment to fuzzy point. 相似文献
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Quantitative relations between spatial similarity degree and map scale change of individual linear objects in multi-scale map spaces 总被引：1，自引：0，他引：1
Haowen Yan 《国际地球制图》2015,30(4):472-482
Quantitative relations between spatial similarity degree and map scale change in multi-scale map spaces play important roles in map generalization and construction of spatial data infrastructure. Nevertheless, no achievements have been made regarding this issue. To fill the gap, this paper firstly proposes a model for calculating spatial similarity degrees between an individual linear object at one scale and its generalized counterpart at the other scale. Then psychological experiments are designed to validate the new model, taking four different individual linear objects at five different scales as test samples. The experiments have shown that spatial similarity degrees calculated by the new model can be accepted by a majority of the subjects. After this, it constructs a formula that can calculate spatial similarity degree using map scale change (and vice versa) for individual linear objects in multi-scale map spaces by the curve fitting method using the point data from the psychological experiments. Both the formula and the model can calculate quantitative relations between spatial similarity degree and map scale change of individual linear objects in multi-scale map spaces, which facilitates automation of map generalization algorithms for linear features. 相似文献
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Classification of topological relations between spatial objects in two‐dimensional space within the dimensionally extended 9‐intersection model 
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下载免费PDF全文 As an important topological relation model, the dimensionally extended 9‐intersection model (DE‐9IM) has been widely used as a basis for standards of queries in spatial databases. However, the negative conditions for the specification of the topological relations within the DE‐9IM have not been studied. The specification of the topological relations is closely related to the definition of the spatial objects and the topological relation models. The interior, boundary, and exterior of the spatial objects, including the point, line, and region, are defined. Within the framework of the DE‐9IM, 43 negative conditions are proposed to eliminate impossible topological relations. Configurations of region/region, region/line, line/line, region/point, line/point, and point/point relations are drawn. The mutual exclusion of the negative conditions is discussed, and the topological relations within the framework of 9IM and DE‐9IM are compared. The results show that: (1) impossible topological relations between spatial objects can be eliminated by the application of 43 negative conditions; and (2) 12 relations between two regions, 31 relations between a region and a line, 47 relations between two lines, three relations between a region and a point, three relations between a line and a point, and two relations between two points can be distinguished by the DE‐9IM. 相似文献
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A framework of region-based spatial relations for non-overlapping features and its application in object based image analysis 总被引：2，自引：0，他引：2
Yu Liu Qinghua Guo Maggi Kelly 《ISPRS Journal of Photogrammetry and Remote Sensing》2008,63(4):461-475
Object based image analysis (OBIA) is an approach increasingly used in classifying high spatial resolution remote sensing images. Object based image classifiers first segment an image into objects (or image segments), and then classify these objects based on their attributes and spatial relations. Numerous algorithms exist for the first step of the OBIA process, i.e. image segmentation. However, less research has been conducted on the object classification part of OBIA, in particular the spatial relations between objects that are commonly used to construct rules for classifying image objects and refining classification results. In this paper, we establish a context where objects are areal (not points or lines) and non-overlapping (we call this “single-valued” space), and propose a framework of binary spatial relations between segmented objects to aid in object classification. In this framework, scale-dependent “line-like objects” and “point-like objects” are identified from areal objects based on their shapes. Generally, disjoint and meet are the only two possible topological relations between two non-overlapping areal objects. However, a number of quasi- topological relations can be defined when the shapes of the objects involved are considered. Some of these relations are fuzzy and thus quantitatively defined. In addition, we define the concepts of line-like objects (e.g. roads) and point-like objects (e.g. wells), and develop the relations between two line-like objects or two point-like objects. For completeness, cardinal direction relations and distance relations are also introduced in the proposed context. Finally, we implement the framework to extract roads and moving vehicles from an aerial photo. The promising results suggest that our methods can be a valuable tool in defining rules for object based image analysis. 相似文献
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多尺度表达中空间拓扑关系等价性评价模型 总被引：4，自引：2，他引：2
本文主要讨论不同尺度下地理目标之间拓扑关系的等价性问题。根据人类认知习惯,得出从大比例尺地理空间中拓扑关系抽象为小比例尺空间中拓扑关系应当遵循的基本规则,并利用模糊函数将这些规则定量化;在此基础上,得到评价地理空间场景中多个空间目标之间拓扑关系在不同尺度下是否等价的综合评价模型。该模型可以用于检验和维护空间数据质量、为地图自动综合提供空间关系处理和评价方法的参考。 相似文献
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矢量GIS空间方向关系的演算模型 总被引：5，自引：0，他引：5
空间方向关系是描述空间目标间位置分布的一类基本空间约束，在GIS中是由形式化模型描述的。但现有模型由于简化假设过多，其描述分辨率较低。以点／点空间方向关系的计算量为基础，在综合考虑空间目标的几何构成和分布关系后，提出了定量化演算空间方向关系的一种新模型。利用该模型的结果，根据定量表达与定性描述之间的转换函数，可以得到相应的定性描述结果。理论分析和算例表明，新模型对目标间距离和目标本身的形状等影响方向关系的参数更为敏感，因而比现有模型有更高的描述分辨率。 相似文献
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Fuzziness is an internal property of spatial objects.How to model fuzziness of a spatial object is a main task of next generation GIS.This paper proposes basic fuzzy spatial object types based on fuzzy topology.These object types are the natural extension of current nonfuzzy spatial object types.A fuzzy cell complex structure is defined for modeling fuzzy regions,lines and points.Furthermore,fuzzy topological relations between these fuzzy spatial objects are formalized based on the 9intersection approach.This model can be implemented for GIS applications due to its scientific theory basis. 相似文献
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CHEN Jun LI Chengming LI Zhilin Gold C M 《地球空间信息科学学报》2000,3(1):1-10
1 Overview of the original 9-inter-section modelThe spatial re1ations betWeen spatial entities areknown as important as the entities themselves. It istherefore very essential to know what poSSibIe spa-tial relationships are and how they can be deter-mined. The 9-intersection model is the most POpu-lar mathematical framework fOr formalizing spatialrelations and have been widely used in spatial querylanguages(EngenhOfer, l991; Clementinietal., l994;Mark et al., l995). Using this medel the t… 相似文献
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在对拓拟邻接凸多边形方向关系计算特殊性分析的基础上，提出了一个邻接凸多边形方向关系计算法和二维空间方向关系推理方法。与Voronoi图所表达的邻近拓扑关系相结合，该算法可以用于计算离散二维空间目标之间的方向关系。 相似文献
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郭仁忠 《武汉大学学报(信息科学版)》1994,(1)
空间物体描述是ＧＩＳ的基本任务之一，而空间物体的分类是空间物体描述的基础。理想的空间物体分类模型不但应具有完备描述（构造）各种空间物体的能力，而且应能够揭示基本的空间关系，有助于空间分析的规范化系统化。本文在分析空间概念模型和现有的几种空间物体分类模型的基础上，提出了空间物体分类的基本原则，给出了新的空间物体分类模型：简单点、复合点、简单线、有向简单线、复合线、有向复合线、多边形，并说明了以这类基本物体类型构造复杂物体的一般性方法。 相似文献
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不确定性线状目标之间拓扑关系的描述与判别 总被引：1，自引：0，他引：1
总结了常见的不确定性线状目标描述模型以及确定性线状目标之间拓扑关系的描述模型，并在此基础上提出了一种定量化分析方法，对不确定性线状目标之间的拓扑关系进行了描述和判别。 相似文献
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This paper focuses on the methods and process of spatial aggregation based on semantic and geometric characteristics of spatial objects and relations among the objects with the help of spatial data structure (Formal Data Structure),the Local Constrained Delaunay Triangulations and semantic hierarchy.The adjacent relation among connected objects and unconnected objects has been studied through constrained triangle as elementary processing unit in aggregation operation.The hierarchical semantic analytical matrix is given for analyzing the similarity between objects types and between objects.Several different cases of aggregation have been presented in this paper. 相似文献
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This paper focuses on the methods and process of spatial aggregation based on semantic and geometric characteristics of spatial objects and relations among the objects with the help of spatial data structure (Formal Data Structure), the Local Constrained Delaunay Triangulations and semantic hierarchy. The adjacent relation among connected objects and unconnected objects has been studied through constrained triangle as elementary processing unit in aggregation operation. The hierarchical semantic analytical matrix is given for analyzing the similarity between objects types and between objects. Several different cases of aggregation have been presented in this paper. 相似文献