摘要
已有的空间方向关系描述模型大都针对空间单个目标,对于群组目标空间方向关系计算模型却鲜有研究和论著。为此,提出适用于群组目标空间方向关系的定性描述与定量计算模型。首先,群组目标空间方向关系定性描述模型利用带约束的Delaunay三角剖分与动态阈值"剥皮"法求得了源目标群分布边界多边形;然后,以方向关系矩阵模型为依据对其方向关系进行了定性描述与建模;其次,运用数学形态变换理论对参考目标群进行"膨胀",求解"膨胀"后的参考目标群与源目标群的交集;最后,在此基础上结合地学信息图谱相关理论实现了群组目标空间方向关系的定量计算与建模。实验表明,群组目标空间方向关系定性描述模型较好地顾及了群组目标的空间形态对空间方向关系的影响,能够对空间方向关系做出较为准确的定性判断;群组目标空间方向关系定量计算模型实现了群组目标空间方向关系的精确定量描述,且能够以形象直观的方式对群组目标空间方向关系进行可视化表达。2种模型较好地解决了群组目标空间方向关系的描述与计算问题。
In geographic space, many objects appear in forms of groups, such as settlements, islands, roads, rivers and so on. The direction relation between object groups usually need to be identified in addition to single object＇s direction relation. For example, when exploring a site for a petrochemical enterprise, the direction relation between it and nearby settlements, rivers, railways need to be identified in order to reduce pollution and improve profits. But most of the existing models for spatial direction relation description aim at single spatial objects. The researches on models for object groups are rare and primitive. Therefore a qualitative description and a quantitative computation models for spatial direction relation description between object groups are proposed. The methods for qualitative description modeling are as follows. First, the minimum boundary rectangle for subject object group is constructed and its direction relation matrix is built, which consists of 9 directional regions. Secondly, the boundary polygon of source object group is computed by methods of constraint Delaunay triangulation and ＂stripping＂ with dynamic threshold. Finally, the boundary polygon is set in the direction relation matrix, the intersections of boundary polygon and 9 directional regions are computed, and the qualitative description is represented as the direction relation matrix. The main steps of quantitative computation modeling are as follows. First, the minimum boundary rectangle of subject object group is constructed. Secondly, theory of mathematical morphologic transformation is introduced to ＂expend＂ the minimum boundary rectangle of subject object group. The ＂expanding＂ starts from due north and finally end up in due north too, which translates the source object group in a series of angles with an angle increment of 5-. The intersection of the ＂expanded＂ subject object group and the source object group is computed. Finally, the spectrum density is computed and the average value as well as varianc
作者
禄小敏
闫浩文
王中辉
LU Xiaomin;YAN Haowen;WANG Zhonghui(School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China;Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, China)
出处
《地球信息科学学报》
CSCD
北大核心
2018年第6期721-729,共9页
Journal of Geo-information Science
基金
国家重点研发计划项目(2017YFB0504203)
国家自然科学基金项目(41371435
41561090
41761088)~~
关键词
群组
方向关系
定性描述
定量计算
模型
object group
spatial direction relation
qualitative description
quantitative computation
modeling
