AIR-PolSAR-Seg-2.0: Polarimetric SAR Ground Terrain Classification Dataset for Large-scale Complex Scenes

The ground terrain classification using Polarimetric Synthetic Aperture Radar (PolSAR) is one of the research hotspots in the field of intelligent interpretation of SAR images. To further promote the development of research in this field, this paper organizes and releases a polarimetric SAR ground terrain classification dataset named AIR-PolSAR-Seg-2.0 for large-scale complex scenes. This dataset is composed of three L1A-level complex SAR images of the Gaofen-3 satellite from different regions, with a spatial resolution of 8 meters. It includes four polarization modes: HH, HV, VH, VV, and covers six typical ground terrain categories such as water bodies, vegetation, bare land, buildings, roads, and mountains. It has the characteristics of large-scale complex scenes, diverse strong and weak scattering, irregular boundary distribution, diverse category scales, and unbalanced sample distribution. To facilitate experimental verification, this paper cuts the three complete SAR images into 24,672 slices of 512×512 pixels, and conducts experimental verification using a series of common deep learning methods. The experimental results show that the DANet based on the dual-channel self-attention method performs the best, with the average intersection over union ratio reaching 85.96% for amplitude data and 87.03% for amplitude-phase fusion data. This dataset and the experimental index benchmark are helpful for other scholars to further carry out research related to polarimetric SAR ground terrain classification.