Journal of Geo-information Science >
An Object-oriented Representation Method for Multi-granularity for Spatio-temporal Position of Geographical Entities
Received date: 2017-05-10
Request revised date: 2017-08-07
Online published: 2017-10-09
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The dynamic variation rules of spatial position of a geographical entity could vary with the granularity of space and time. Scholars have tried to analyze the spatio-temporal position of geographical entities at multiple levels during the process of spatio-temporal reasoning, track data mining, and so on. Therefore, it has been a hotspot in GIS that how to effectively organize and express the spatio-temporal position of geographical entities under different spatio-temporal granularities. To solve this problem, two strategies have been applied for one geographical entity based on object-oriented thinking: "a three-level space" and "0-1 variation series of positions". Based on that two strategies, a method has been proposed to support the multi-granularity representation of spatio-temporal position of a geographical entity. Firstly, a three-level space including global space, relative space and object space has been constructed to guarantee the multi-granularity of the space, the transformation from different time period or moment to a series of discrete time points with different temporal granularity helping break the limit of temporal granularity. Then, for one geographical entity, its change process of spatio-temporal position could be divided into a series of stages according to the "0-1 variation series of positions". Based on this, different storage schemes for its spatial position information under each time point have been designed to reduce redundancy. Furthermore, the progressive recognition aroused from the three-level space, and the transitions between time points and periods could help to obtain the spatio-temporal positions of one geographical entity at more spatio-temporal granularities through its positions at existing spatiotemporal granularities. By the loose coupling between the space and time in describing the positions of geographical entities, the method could efficiently represent the spatio-temporal positions of geographical entities under variable granularity of space and time, which could help provide a reference for temporal GIS or multi-granularity spatio-temporal database.
YU Tianxing , LI Rui , WU Huayi . An Object-oriented Representation Method for Multi-granularity for Spatio-temporal Position of Geographical Entities[J]. Journal of Geo-information Science, 2017 , 19(9) : 1208 -1216 . DOI: 10.3724/SP.J.1047.2017.01208
Fig. 1 An example of position change of one geographical entity图1 地理实体位置的变化示例 |
Fig. 2 The concrete expression of multi-granularity of spatio-temporal position of one geographical entity图2 地理实体时空位置多粒度描述 |
Fig. 3 The stages division and storage schemes for the spatio-temporal positions of one geographical entity图3 地理实体时空位置的阶段划分与信息存储方式 |
Fig. 4 The generation of 0-1 variation series of positions of one geographical entity under certain time granularity图4 地理实体在某一时间粒度下的0-1位置变化序列生成过程 |
Fig. 5 Relative space obtained from multistage cognition图5 多级认知获得的相对空间 |
Fig. 6 The transformations of one geographical entity's positions under different spatiotemporal granularities图6 地理实体的时空粒度转换 |
The authors have declared that no competing interests exist.
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