Parallel Access Methods for Geographic Raster Data
Luo Chen · 2012
In the field of geographic raster data processing,the data I/O performance significantly impacts the perfor-mance of a parallel program,especially when data are massive.Currently,the research on parallel optimizations for geographic raster data I/O is quite limited.By combining the data I/O paradigms in parallel programs with the characteristics of the geographic raster logical and physical models,we proposed a parallel I/O architecture for geographic raster data,and implemented four parallel access methods based on message passing model.Massive experiments verify that our methods outperform not only the conventional sequential I/O method but also the time-sharing multi-processes data access method.Our work can be used to promote the I/O efficiency of a parallel raster processing algorithm and thus improve the parallel performance of the program.