This layer maps water turbidity across the water bodies of the site using the Normalized Difference Turbidity Index (NDTI), computed from Sentinel-2 MSI imagery (ESA/Copernicus) at 10 m resolution. NDTI is derived from the red and green bands: higher values indicate more suspended particles and cloudier water, while lower values indicate clearer water. Only water pixels are evaluated, since land is masked out.
Water turbidity is estimated with the Normalized Difference Turbidity Index (NDTI) from Sentinel-2 MSI surface reflectance. NDTI is the normalized difference between the red band (B4, 665 nm) and the green band (B3, 560 nm), both at 10 m native resolution:
NDTI = (B4 - B3) / (B4 + B3)
Higher NDTI values correspond to greater light scattering by suspended particles, i.e. more turbid water; lower values correspond to clearer water. Land pixels are masked so the index is computed only over aquatic surfaces.
| Code | Provider | Resolution | Year |
|---|---|---|---|
| WRD_S2XXX_99 | ESA/Copernicus | 10 m | time-dependent (per requested period) |
The layer is produced by the S2NDTI reader in three modes: a single-date snapshot, a mean composite over an arbitrary date range, and a delta comparing two periods.