TRMM_2A54: Ground Radar Rain Type Maps for Satellite Validation

TRMM Ground Validation Radar Site Rain Type Map L2 provides instantaneous 2 km resolution maps classifying surface precipitation as convective or stratiform. The dataset covers four primary validation sites in Darwin, Houston, Kwajalein, and Melbourne, with map extents ranging from 300 km x 300 km to 724 km x 568 km. It is a key product for validating satellite-based precipitation estimates from the Tropical Rainfall Measuring Mission.

Use Cases

• Validating TRMM satellite precipitation estimates using ground-based radar classification maps.
• Analyzing the spatial distribution of convective vs. stratiform rain events at specific field sites.
• Comparing precipitation structure across different climatic regions (e.g., Australia, Marshall Islands, USA).
• Supporting ground instrument network quality control for rain gauges and disdrometers.

Strengths

• Provides high-resolution (2 km) spatial classification of rain type from quality-controlled ground radar.
• Covers long-term measurements from four established international validation sites.
• Cross-platform presence on NASA Earthdata and Data.gov signals importance and curation.

Limitations

• Critical metadata is missing: column names, row counts, and exact file sizes are unknown.
• Conflicting 'last updated' dates (2014 vs. 2026) create uncertainty about dataset freshness and maintenance.
• Spatial coverage is limited to specific, discontinuous geographic regions around the validation sites.

Provenance

Source

NASA GES DISC, from the TRMM (Tropical Rainfall Measuring Mission) Ground Validation effort.

Collection Method

Data collected from ground-based radar, rain gauges, and disdrometers, quality-controlled and processed into validation products.

Time Range

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Freshness

2026-04-09 21:39:52.248391 (most recent date listed, though conflicting with an older date)

Geography

Four primary sites: Darwin, Australia; Houston, Texas; Kwajalein, Republic of the Marshall Islands; Melbourne, Florida. Additional measurements at NASA Wallops Flight Facility.