S2RC-GCN: A Spatial-Spectral Reliable Contrastive Graph Convolutional Network for Complex Land Cover Classification Using Hyperspectral Images

TL;DR

This paper introduces S2RC-GCN, a novel graph convolutional network that fuses spectral and spatial features with a reliable contrastive learning approach, significantly improving complex land cover classification accuracy in hyperspectral images.

Contribution

The paper proposes a new spatial-spectral contrastive GCN framework with an attention-based encoder and reliable contrastive learning for hyperspectral land cover classification.

Findings

Achieved superior classification accuracy on complex land cover datasets.

Effectively fused spectral and spatial features for improved representation.

Enhanced robustness of features through reliable contrastive learning.

Abstract

Spatial correlations between different ground objects are an important feature of mining land cover research. Graph Convolutional Networks (GCNs) can effectively capture such spatial feature representations and have demonstrated promising results in performing hyperspectral imagery (HSI) classification tasks of complex land. However, the existing GCN-based HSI classification methods are prone to interference from redundant information when extracting complex features. To classify complex scenes more effectively, this study proposes a novel spatial-spectral reliable contrastive graph convolutional classification framework named S2RC-GCN. Specifically, we fused the spectral and spatial features extracted by the 1D- and 2D-encoder, and the 2D-encoder includes an attention model to automatically extract important information. We then leveraged the fused high-level features to construct graphs and fed the resulting graphs into the GCNs to determine more effective graph representations. Furthermore, a novel reliable contrastive graph convolution was proposed for reliable contrastive learning to learn and fuse robust features. Finally, to test the performance of the model on complex object classification, we used imagery taken by Gaofen-5 in the Jiang Xia area to construct complex land cover datasets. The test results show that compared with other models, our model achieved the best results and effectively improved the classification performance of complex remote sensing imagery.