Parameter Sensitivity Analysis of the Exponential Filter Model
DOI:
https://doi.org/10.54691/323nq355Keywords:
Soil Moisture; Exponential Filter; Root-zone Soil Moisture Inversion.Abstract
This study employs the ERA5-Land soil moisture dataset and applies an exponential filter to estimate root-zone soil moisture across the Indochina Peninsula. The filtered estimates are then compared against the original root-zone soil moisture provided by ERA5-Land. The focus is on examining the parameter range of the exponential filter model—that is, how closely the estimated root-zone soil moisture matches the known ERA5-Land values under different filter time constants. The objective is to assess the impact of filter parameter selection on the estimation results and to provide guidance for inverting root-zone soil moisture from surface observations in remote sensing applications. This approach offers an effective solution in complex terrains where in situ validation data are scarce.
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