Large spatial data modeling and analysis: A Krylov subspace approach
Large spatial data modeling and analysis: A Krylov subspace approach
复制标题
大空间数据建模和分析:Krylov 子空间方法
DOI:
10.1111/sjos.12555
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发表时间:
2022
影响因子:
1
通讯作者:
Wang, Haonan
中科院分区:
文献类型:
--
作者:
Liu, Jialuo;Chu, Tingjin;Zhu, Jun;Wang, Haonan
Estimating the parameters of spatial models for large spatial datasets can be computationally challenging, as it involves repeated evaluation of sizable spatial covariance matrices. In this paper, we aim to develop Krylov subspace‐based methods that are computationally efficient for large spatial data. Specifically, we approximate the inverse and the log‐determinant of the spatial covariance matrix in the log‐likelihood function via conjugate gradient and stochastic Lanczos on a Krylov subspace. These methods reduce the computational complexity fromtoandfor dense and sparse matrices, respectively. Moreover, we quantify the difference between the approximated log‐likelihood function and the original log‐likelihood function and establish the consistency of parameter estimates. Simulation studies are conducted to examine the computational efficiency as well as the finite‐sample properties. For illustration, our methodology is applied to analyze a large dataset comprising LiDAR estimates of forest canopy height in western Alaska.
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