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测绘学报  2013 

面向居民地匹配骨架线傅里叶变化方法

, PP. 913-0

Keywords: 居民地,降维,骨架线,匹配,傅立叶变换,相关系数

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Abstract:

大比例尺城市居民地是变化最为活跃的要素之一,已成为空间数据更新的主要内容。由于面状居民地形态复杂多样,数据量密集,匹配过程复杂,是空间数据匹配中的重点和难点之一,一直以来未得到很好的解决。本文首先采用降维技术,把大比例尺面状居民地转化为能够反映其形态特征的线状骨架线;进一步把骨架线转化为更易于表达其形态特征的几何形态数据,并对其进行插值计算;然后对几何形态数据采用傅立叶变换,获取匹配双方骨架线之间的相关系数;最后,通过相关系数来判断双方骨架线之间是否符合匹配条件,得到匹配结果。通过把2维面状居民地转化为1维骨架线,有效降低了空间数据的复杂性,并可把线要素处理的诸多方法引入进来;把骨架线转化为几何形态数据,并采用傅立叶变换进行形态计算,线要素的几何形态相似性分析得到显著增强,提高了数据匹配的准确率。实验验证了本方法的有效性和科学性。

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