Incorporate center frequency metadata
The following study compiled the center frequency of radar surveys and distinguished between helicopter and fixed-wing. In some cases this could be extracted from existing metadata, but in others required that they refer back to the original publications.
MacGregor, J. A., Studinger, M., Arnold, E., Leuschen, C. J., Rodríguez-Morales, F., and Paden, J. D. (2021): An empirical relation between center frequency and measured thickness for radar sounding of temperate glaciers, The Cryosphere, 15, 2569–2574. https://doi.org/10.5194/tc-15-2569-2021
They provide a file with their results: https://doi.org/10.5194/tc-15-2569-2021-supplement
We should consider incorporating their results.