InSAR生成DEM的多条带快速融合方法

Fast mosaicking method of InSAR-generated multi-stripe digital elevation model

提出了一种DEM大范围快速融合方法,该方法首先DEM重叠区域通过分块匹配策略提取密集连接点并进行区域网平差修正平面和高程上的系统误差;在此基础上通过先顺轨后垂轨的策略融合生成一整副DEM;同时为了提升整个融合效率,采用策略加快处理速度。实验结果表明,提出CPU/GPU异步并行方法比单CPU处理效率提升了18倍,实现了多条带DEM无缝融合。

A large-scale rapid DEM mosaicking method was proposed. In this method,dense tie-points were extracted from the DEM overlap areas using a block matching strategy,and the systematic errors of plane and elevation were corrected through block adjustment. Thus,an entire DEM set was generated using the mosaicking strategy of first along-track followed by cross-track. A computing strategy was adopted to accelerate the processing speed to improve the efficiency of the entire mosaicking process. The experimental results showed that the CPU/GPU asynchronous parallel method proposed in this study improves the processing efficiency by more than 18times that of a single CPU,and realises the seamless mosaicking of multi-stripe DEMs.