Acta Geodaetica et Cartographica Sinica >
Research on a Buffer Algorithm Based on Region-Merging of Buffered Geometry Components and Its Parallel Optimization
Received date: 2013-12-06
Revised date: 2014-06-23
Online published: 2014-09-25
Abstract: The double-sided parallel line method and the geometry rasterization-based dilation method have been extensively used for buffer generation in spatial analysis. The former involves a series of complex numerical operations and may not be suitable for parallelized computation; the latter inevitably introduces precision problems and computation complexity. In this paper, we proposed a parallel buffer construction algorithm based on region-merging of buffered geometry components in association with the message passing interface (MPI) parallel programming model. Several optimization strategies were studied for the parallel buffer algorithm. The performances of both serial and parallel buffer algorithms were comparably analyzed. Three performance bottlenecks which significantly impact the algorithm efficiency were identified: area merging operation, task load balance strategy and MPI inter-process results merging methods. Corresponding optimization approaches involving tree-like area and inter-process results merging and the parallel task partition based on vertex number oriented parallel task partition strategy were suggested to overcome these bottlenecks. Several experiments were carried out to examine the performance efficiency of the optimized parallel algorithm. The estimation results suggested that our method could provide high performance and processing ability for buffer construction in a parallel environment. Our method could provide insights into the parallelization of spatial analysis algorithm.
Key words： Parallel Algorithm; Buffer; MPI; Task Partition; Tree-like Merging
FAN Junfu MA Ting ZHOU Chenghu JI Min ZHOU Yuke XU Tao . Research on a Buffer Algorithm Based on Region-Merging of Buffered Geometry Components and Its Parallel Optimization[J]. Acta Geodaetica et Cartographica Sinica, 2014 , 43(9) : 969 -975 . DOI: 10.13485/j.cnki.11-2089.2014.0122
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