Level-2 GSM coefficients
Monthly Stokes coefficients from HUST-Grace2024, CSR RL06, GFZ RL06, JPL RL06, or comparable GRACE/GRACE-FO products. The workflow keeps center, release, lmax, month tag, and missing-month status visible.
Data
GRACE Level-2 Data Products
Keep data products explicit, versioned, and auditable. This page defines the data vocabulary used by the website and visualization software, from GSM coefficients to gridded EWH and basin-scale TWSA diagnostics.
Correction products
Degree-1 geocenter terms, SLR-based C20/C30 replacement, GIA correction, mean-field baseline removal, and background-field alignment are treated as explicit preprocessing inputs.
Gridded EWH / TWSA products
Corrected and filtered spherical harmonics are synthesized into equivalent-water-height grids for map preview, basin averaging, annual amplitude, semi-annual amplitude, and trend analysis.
Reference and validation data
CSR Mascon, GLDAS-Noah, basin masks, land/ocean masks, coastline buffers, and Hydroweb altimetry are used as independent checks for filtered products.
Product lineage
| Layer | Product | Required metadata |
|---|---|---|
| Raw input | GSM spherical harmonics | center, release, lmax, month, background model, missing flag |
| Preprocessed anomaly | corrected ΔC/ΔS | degree-1 source, C20/C30 source, GIA model, baseline period |
| Filtered branch | GAUSS / FAN / PnMm / DDK / HSAF | filter family, radius/order, HSAF parameters, product tag |
| Application product | EWH grid and basin TWSA series | unit, grid spacing, mask, leakage/scaling rule, statistics |
Immutable input
Raw Level-2 files and replacement products are read-only. Derived products are written to versioned output folders.
Traceable metadata
Every figure, grid, and basin series should be traceable to the exact configuration and product tag that generated it.
External consistency
Mascon products, hydrological models, and altimetry records are used to check signal behavior after filtering and leakage correction.
This page documents product structure and processing rules. Large raw datasets and derived scientific outputs should stay outside the website repository unless their distribution terms and file-size policy are clear.