GPM Precipitation Downloader

Download GPM IMERG (Global Precipitation Measurement) precipitation data from NASA GES DISC.

Overview

This skill downloads GPM IMERG Late Run (GPM_3IMERGDL) daily precipitation data at 0.1° resolution from NASA's Goddard Earth Sciences Data and Information Services Center (GES DISC). Data is freely available via direct HTTPS download.

Data Source

• Dataset: GPM_3IMERGDL (IMERG Late Run Daily)
• Provider: NASA GES DISC (disc.gsfc.nasa.gov)
• Resolution: 0.1° × 0.1° (~10 km)
• Variables: precipitation, precipitationCal, randomError
• Format: HDF5 (.HDF5)
• URL Pattern: https://gpmweb2.gesdisc.eosdis.nasa.gov/data/GPM_L3/GPM_3IMERGDL.07/YYYY/MM/

Usage

Search for available files

python gpm-download.py \
    --start-date 2024-01-01 \
    --end-date 2024-01-31 \
    --bbox 116.0 39.0 117.0 40.0

Download data

python gpm-download.py \
    --start-date 2024-01-01 \
    --end-date 2024-01-31 \
    --bbox 116.0 39.0 117.0 40.0 \
    --download \
    --output-dir ./gpm_data

Select variables

python gpm-download.py \
    --start-date 2024-01-01 \
    --end-date 2024-01-31 \
    --variables precipitation precipitationCal \
    --download

JSON output

python gpm-download.py \
    --start-date 2024-01-01 \
    --end-date 2024-01-31 \
    --output-format json

CLI Arguments

Argument	Description	Default
--start-date	Start date (YYYY-MM-DD)	Required
--end-date	End date (YYYY-MM-DD)	Required
--bbox	Bounding box (minLon minLat maxLon maxLat)	Global
--variables	Variables to download	precipitation
--download	Trigger download	False (search only)
--output-dir	Download directory	./gpm_data
--output-format	Output format (text/json)	text
--no-progress	Disable progress bar	False
--quiet	Suppress progress output	False
--list-variables	List available variables	-

Privacy Disclosure

When this script runs, it sends:

• Date range queries to NASA GES DISC HTTPS endpoints
• No API keys, local files, or PII are sent

License

MIT-0. GPM data © NASA (public domain).