An efficient multiple scanning order algorithm for accumulative least-cost surface calculation

An efficient multiple scanning order algorithm for accumulative least-cost surface calculation
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一种高效的多扫描顺序累积最小成本曲面计算算法

DOI:
10.1080/13658816.2022.2052885
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发表时间:
2022
影响因子:
5.7
通讯作者:
Wang, Zekun
Wang, Zekun
中科院分区:
地球科学2区
文献类型:
--
作者:
Yao, Yuanzhi;Shi, Xun;Wang, Zekun

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最小代价曲面(LCS)计算是一个计算密集型问题,通常由基于最小代价的Dijkstra算法解决。也已经提出了替代的基于光栅的扫描算法,其使用移动窗口来迭代地扫描整个研究区域。在这里,我们提出了基于光栅的算法的改进。主要改进是实现多扫描顺序(MSO),以取代传统的单一扫描顺序(SSO,通常从左上角到右下角,逐行)。我们比较了不同的算法在不同的成本表面和不同数量的源点的性能。比较表明,基于光栅的算法,采用MSO具有明显优于传统的基于光栅的算法,使用SSO的性能。基于MSO光栅的算法通常可与基于纹理的Dijkstra算法相比较,并且在相对简单的成本表面(例如,其中成本被重新采样)上和/或当源点的数量相对较大时超过后者。我们的实证实验表明,MSO降低了时间复杂度从totoAdditionally,我们发现,MSO光栅为基础的算法可以很容易地使用共享内存并行编程并行化。
The least-cost surface (LCS) calculation is a compute-intensive problem conventionally solved by the queue-based Dijkstra’s algorithm. Alternative raster-based scanning algorithms have also been proposed which use a moving window to scan the whole study area iteratively. Here we propose improvements to the raster-based algorithms. The main improvement is to implement multiple scanning orders (MSO) to replace the conventional single scanning order (SSO, typically from upper-left corner to lower-right corner, row by row). We compared the performance of different algorithms over different cost surfaces and with different numbers of source points. The comparison shows that a raster-based algorithm adopting MSO has a substantially better performance than a conventional raster-based algorithm using SSO. An MSO raster-based algorithm is generally comparable to the queue-based Dijkstra’s algorithm, and surpasses the latter over a relatively simple cost surface (e.g. in which the cost is resampled) and/or when the number of source points is relatively large. Our empirical experiments suggest that MSO reduces the time complexity from totoAdditionally, we found that the MSO raster-based algorithm can be easily parallelized using shared-memory parallel programming.
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