Validation of Permafrost Active Layer Estimates from Airborne SAR Observations. - Andrew D. Parsekian; Richard H. Chen; Roger J. Michaelides; Taylor D. Sullivan; Leah K. Clayton; Lingcao Huang; Yuhuan Zhao; Elizabeth Wig; Mahta Moghaddam; Howard A. Zebker; Kevin M. Schaefer (Remote. Sens., 2021)