NASA IMERG

The Integrated Multi-satellitE Retrievals for GPM (IMERG) is a NASA algorithm that merges precipitation estimates from the constellation of passive microwave satellites in the Global Precipitation Measurement (GPM) mission with microwave-calibrated infrared estimates, monthly gauge analyses, and other sources to produce a global, gridded, half-hourly precipitation record. IMERG intercalibrates, merges, and interpolates these inputs onto a 0.1 degree grid spanning the TRMM and GPM satellite eras.

dynamical.org republishes NASA IMERG as free, analysis-ready Icechunk Zarr archives — open them directly with Xarray, no GRIB wrangling or bulk downloads.

Analyses

• NASA IMERG analysis, earlynasa-imerg-analysis-early
  time-optimized
  Global · 2 variables · 0.1 degrees
• NASA IMERG analysis, latenasa-imerg-analysis-late
  time-optimized
  Global · 2 variables · 0.1 degrees

Data access

• STAC catalog (browse) — the machine-readable source of truth.
• AWS Open Data Registry entry · browse the S3 bucket