Heterogeneous Network Based Contrastive Learning Method for PolSAR Land Cover Classification

This paper proposes a Heterogeneous Network based on Contrastive Learning (HCLNet). HCLNet aims to learn high-level representation from unlabeled PolSAR data for few-shot classification according to multi-features. It introduces the heterogeneous network for the first time to utilize different PolSAR features better. Beyond the conventional CL, HCLNet develops two easy-to-use plugins to narrow the domain gap between optics and PolSAR, including beam search and superpixel-based instance discrimination. The pre-trained online network is used for the downstream task by fine-tuning. Experiments demonstrate the superiority of HCLNet on three widely used PolSAR benchmark data sets compared with state-of-the-art methods on few-shot classification. Ablation studies also verify the importance of each component. Besides, this work has implications for how to efficiently utilize the multifeatures of PolSAR data to learn better high-level representation in CL and how to construct networks suitable for PolSAR data better.

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Cai, Jianfeng, et al. "Heterogeneous Network Based Contrastive Learning Method for PolSAR Land Cover Classification." IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing (2024).