Daily worldwide soil moisture, v4 (Copernicus) — clms_swi_global_12.5km_daily_v4

In plain English

What it measures. Gives daily updates on moisture in different soil layers across the entire planet.

How it's made. ESA Copernicus produces it at 12.5-kilometre resolution from Metop ASCAT radar, covering 2025 onward.

How & where you'd use it. Supports drought early-warning systems, farming decisions, and global water-cycle monitoring.

What's measured

CopernicusCLMSSWISoil Water Indexsoil moistureglobaldaily12.5kmMetopASCAT

Coverage & cadence

Time span2007-01-01 → ongoing
Spatial extent-180, -90, 180, 90
FormatsCOG, NetCDF

What you can do with it

Follow rainfall, floods and surface-water extent
Track soil moisture and the onset of drought
Monitor lakes, rivers and groundwater storage

Official description

Provides daily updates on the moisture conditions in different soil layers. The data are available over the globe at the spatial resolution of 12.5 km from 2025 onwards.

Get the data

copernicus_access.py

# ESA Copernicus Data Space — open STAC API (free account)
from pystac_client import Client

cat = Client.open("https://stac.dataspace.copernicus.eu/v1")
search = cat.search(
    collections=["clms_swi_global_12.5km_daily_v4"],   # add _cog or _nc for a format variant
    bbox=(-10, 35, 30, 60),             # your area (W,S,E,N)
    datetime="2024-01-01/2024-12-31",
)
items = list(search.items())            # then read assets with rioxarray / xarray

Browsing the Copernicus STAC is open; downloading bytes needs a free Copernicus Data Space account.

Official links

Open data source Copernicus STAC