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	Parallel algorithm of a modified surface modeling method and its application in digital elevation model construction
	Zhao M. W.; Yue, T. X.; Zhao, N.; Yang, X.; Wang, Y. F.; Zhang, X. Y.
	2015
关键词	HASM DEM LIDAR Parallel algorithm Simulation accuracy earths surface high-accuracy dem construction approximation topography science china slope hasm
英文摘要	High accuracy surface modeling (HASM) has been proved to be a superior method for surface simulation compared to classical interpolation methods. However, the fact that HASM is time consuming combined with its dependence on its driving field restricts its application in large area problems. This research develops a modified HASM which can get rid of the driving field in the surface simulation, and the parallel version of the modified HASM is also proposed with the purpose of improving its computational efficiency. Light detection and ranging (LIDAR) data are used as an optimum constraint to construct digital elevation model (DEM). Tests show that the modified HASM can perform surface simulation successfully without the driving field. And it also shows that the simulation accuracy of the modified HASM is almost the same as the old HASM and the classical interpolation methods when the sampling rate is larger than 0.5 %, while the modified HASM shows significantly increased simulation accuracy as the sampling rate decreases. This characteristic indicates that the modified HASM no longer relies on the driving field in the surface simulation. And it also improves the simulation accuracy compared to the old HASM and the classical interpolation methods. Tests of parallel efficiency show that the master-slave mode used in the parallel algorithm obtains a satisfactory result, indicating that the HASM can be applied to surface simulation of large area problems. And it also shows that the modified HASM would have great potential where applied in high-resolution DEM and digital surface model (DSM) construction from LIDAR data.
出处	Environmental Earth Sciences
卷	74
期	8
页	6551-6561
收录类别	SCI
语种	英语
ISSN号	1866-6280
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/39073]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Zhao M. W.,Yue, T. X.,Zhao, N.,et al. Parallel algorithm of a modified surface modeling method and its application in digital elevation model construction. 2015.

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