A Modelling and Evaluation Framework for EuroCrops-Driven Sentinel-2 Crop Segmentation
This study addresses challenges in crop semantic segmentation using Sentinel-2 imagery and EuroCrops field annotations, including label heterogeneity, domain shift, and limited cross-regional generalization. To tackle these issues, the authors develop a configurable data processing and evaluation framework that harmonizes multi-source vector labels into aligned multispectral image–mask pairs. They train a four-level U-Net architecture with Group Normalization to segment ten crop classes, leveraging all ten Sentinel-2 spectral bands and optimizing a composite loss function combining class-weighted cross-entropy and Dice loss. Experimental results show a mean Intersection over Union (mIoU) of 0.7665 and pixel accuracy of 0.8693 on an internal test set. The first systematic cross-regional evaluation reveals strong transfer performance for dominant crops like maize and wheat, yet highlights limited generalization for minority classes and single-temporal inputs.