GPM Ground Validation Autonomous Parsivel Unit Rainfall Data

Rainfall data from the Global Precipitation Measurement (GPM) Mission Ground Validation Experiment collected at the National Space Science Technology Center in Huntsville, Alabama. The dataset is produced by NASA using an Autonomous Parsivel Unit optical disdrometer to measure particle size and fall velocity. It supports satellite validation campaigns, though gaps occur when the instrument is deployed to field sites.

Use Cases

• Validating satellite-derived precipitation estimates from the GPM mission using ground-based particle size and velocity measurements.
• Analyzing rainfall microphysics, such as drop size distribution and precipitation intensity, for meteorological model improvement.
• Calibrating other precipitation measurement instruments by comparing with detailed disdrometer data on liquid precipitation rain.
• Studying temporal patterns of precipitation amount and rate at a fixed ground validation site.

Strengths

• Data is collected using a state-of-the-art optical disdrometer (Parsivel) designed for single particle extinction measurements.
• Supports major international satellite validation efforts through the GPM mission and joint-agency field campaigns.
• Dataset is maintained by NASA, a leading authority in Earth science observation.

Limitations

• Key technical details are missing, including column names, row count, and precise temporal coverage.
• There is a conflict in reported last updated dates between platforms (2011 vs. 2026), casting doubt on data freshness.
• Dataset contains occasional gaps when the instrument is removed from its primary site for field campaign participation.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Collected by an Autonomous Parsivel Unit (APU) optical disdrometer, with support systems built by the University of Alabama in Huntsville.

Freshness

Last updated dates conflict: one platform reports 2026-03-13, another reports 2011-03-30.

Geography

National Space Science Technology Center (NSSTC), Huntsville, Alabama, USA, with additional data from various field campaign sites.