Multi-temporal phenological indices derived from time series Sentinel-1 images to country-wide crop classification

•Crop classification based on time series of Sentinel-1 images using SAR polarimetry.•Multi-temporal descriptors of crops phenology derived from coherence matrices and H/α decomposition.•Fast object-oriented classification approach with the use of Random Forest classifier.•County-wide testing and mapping.•Use of administrative data as a source of reference data.