GCPEx Snow Surveys: Ground Validation for Satellite Snowfall Retrieval

GPM Ground Validation Environment Canada Snow Surveys GCPEx dataset contains manual snowpack measurements collected during the GPM Cold-season Precipitation Experiment. The data was gathered weekly from January 20 to February 27, 2012, across four sites in Ontario, Canada, to provide baseline ground truth for validating satellite snowfall retrieval algorithms. This dataset was produced by the National Aeronautics and Space Administration (NASA) as part of a focused field campaign.

Use Cases

• Validating satellite-derived snowfall estimates from the GPM mission by comparing them to ground-measured snow water equivalent.
• Analyzing spatial distribution of snow depth across a 100-meter transect with measurements taken every 50 cm.
• Studying the relationship between snow bulk density and snow water equivalent using paired measurements collected every 25 meters.
• Providing ground truth data for improving numerical weather prediction and hydrological models of cold-season precipitation.

Strengths

• Data was collected during a dedicated, multi-site field campaign (GCPEx) designed to address specific algorithm shortcomings.
• Measurements follow a structured protocol with defined spatial intervals (every 25m for density/SWE, every 50cm for depth along a 100m transect).
• The dataset's cross-platform presence on Data.gov and NASA Earthdata indicates its recognized importance for validation work.

Limitations

• The exact row count, file size, and specific column names are not provided on any platform, limiting precise data assessment.
• There is a conflict in the 'last updated' metadata: Data.gov lists 2026-03 13 (likely an administrative error), while NASA Earthdata lists 2012-02-27 (the collection end date).
• The license is specified only as 'other-license-specified' on Data.gov, with no details provided on NASA Earthdata.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Manually collected using an ESC-30 snow corer for density/water equivalent and a GPS-equipped snow depth probe.

Time Range

January 20, 2012 through February 27, 2012

Freshness

2026-03-13 02:24:49.023409

Geography

Four sites in Ontario, Canada: CARE, Steamshow, Huronia Airport, and Skydive-Jump.