TRMM_2A52: Ground Radar Rain Existence for Satellite Validation

TRMM_2A52 provides monthly rain existence data from ground-based radar volume scans at primary validation sites. The product quantifies the fraction of a radar's field of view containing measurable precipitation for comparison with satellite observations from the Tropical Rainfall Measuring Mission. Data collection involves quality-controlled ground radar, rain gauges, and disdrometers at sites in Australia, Texas, Florida, and the Marshall Islands.

Use Cases

• Validating TRMM satellite precipitation products based on ground radar 'existence' fraction.
• Analyzing spatial patterns of rain occurrence at specific ground validation sites over monthly periods.
• Comparing precipitation detection algorithms using collocated radar and disdrometer measurements.
• Studying long-term rainfall characteristics at instrumented sites like NASA Wallops Flight Facility.

Strengths

• Data is quality-controlled as part of a formal NASA Ground Validation (GV) effort.
• Covers four primary, long-term instrumented sites with multiple measurement types (radar, gauges, disdrometers).
• Cross-platform presence on datagov and nasa_earthdata signals recognized importance and persistence.

Limitations

• Specific column names, row counts, and file sizes are not provided in any source.
• Conflicting 'last updated' dates between sources (2014 on nasa_earthdata vs. 2026 on datagov) creates uncertainty about data currency.
• Documentation appears sparse, with no detailed schema for the BIN file format.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Collected from ground-based radar, rain gauges, and disdrometers at validation sites, quality-controlled, and processed into product files.

Freshness

2026-04-09 (from datagov), though conflicting with 2014 date from nasa_earthdata.

Geography

Primary sites: Darwin (Australia), Houston (Texas), Kwajalein (Marshall Islands), Melbourne (Florida); additional measurements at NASA Wallops Flight Facility (Virginia).