Journal of University of Chinese Academy of Sciences >
An efficient Union algorithm for large vector data
Received date: 2013-03-29
Revised date: 2013-05-17
Online published: 2014-01-15
We designed an efficient union algorithm for large vector data. Firstly, we studied the union function between two or more layers, analyzed characteristics of attribute data and geometry data, and designed union algorithms for attribute data and geometry data, respectively. Secondly, we built a quad-tree index for the features of input layers. Finally, we used multithread to run the efficient union algorithm. A performance test was executed using three different vector data layers. The results show that the performance of the union function based on this algorithm is more efficient than the one in ESRI's ArcGIS10.0.
Key words： large vector data; quad-tree index; Union algorithm; multithread
WANG Qinggang , YANG Chongjun , TIAN Shengjun , WANG Feng . An efficient Union algorithm for large vector data[J]. Journal of University of Chinese Academy of Sciences, 2014 , 31(1) : 92 -97 . DOI: 10.7523/j.issn.2095-6134.2014.01.014
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