TY JOUR TI Automatic Identification of Ocean Eddies in SAR Using U-Net Convolutional Neural Network KW automatic eddy detection KW Envisat SAR images KW U-Net convolutional neural network JO Russian Journal of Earth Sciences AU Tuchinskaya, V.I. AU Bashmachnikov, I.L. AU Zahvatkina, N.Y. AU Kozlov, I.E. AU Iakovleva, D.A. PY 2026 IS PB Geophysical Center of the Russian Academy of Sciences