Methods

Method Notes

A compact record of each filter family and its routing contract.

Gaussian smoothing

Baseline isotropic spatial smoothing for high-degree noise suppression.

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Decorrelated filtering

PnMm style polynomial de-correlation for north-south stripe reduction.

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DDK filtering

Anisotropic regularized filtering with covariance-aware smoothing behavior.

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HSAF / Hankel filtering

Adaptive spectral decomposition for stripe suppression and signal preservation.

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Leakage correction

Scale factor and surrounding signal correction for bounded regions and basins.

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Validation

Map preview, basin series, annual amplitude, trend, RMSE, and external product consistency.

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