HIGHLIGHTS
SUMMARY
Land DA developments have been reviewed earlier (Reichle, 2008; Lahoz and De Lannoy, 2014; De Lannoy et_al, 2016; Jin et_al, 2018; Huang et_al, 2019; Xia et_al, 2019; Girotto et_al, 2020; Baatz et_al, 2021; Durand et_al, 2021). If communication among different columns is made possible via the physics-based model or via spatial error correlations, thus making the DA system spatially distributed, then state variables in neighboring (observed or unobserved) columns within the influence radius of a given observation are analyzed together (Reichle and Koster, 2003; De Lannoy et_al, 2010; Magnusson et_al, 2014; Reichle et_al . . .
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