Translating bumblebee dialect…
In March of 2019 we deployed a multi-polarization 1GHz ground-penetrating radar (GPR) array on the snow covered Grand Mesa, Colorado during a four-day field campaign supporting airborne ultra-wideband radar acquisitions. We acquired approximately 95 km of multi-polarization GPR imagery and developed an automated processing workflow for estimating the spatial distribution of snow water equivalent (SWE) on the mesa. Mapping SWE in dry snow with single-offset GPR requires an estimate of the two-way travel time between the snow surface and the ground reflection, a radar velocity, and an estimate of snow density. Velocities were estimated from column-averaged snow densities measured in snow pits. The Sensors & Software multi-channel array was configured to measure each of four orthogonal antenna polarizations. We automatically determine travel-times of the ground reflection through the snow cover by selecting the maximum coherence of each multi-pol shot gather. This acquisition and processing strategy compares favorably to SWE measurements of snow pits (R2 = 0.95, MAE = 26.3 mm w.e.) and probe measurements of snow depth (R2 = 0.37, MAE = 17 cm).
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