Multiscale Attention Fusion Graph Network for Remote Sensing Building Change Detection

With the development of imaging systems and satellite technology, higher quality high-resolution remote sensing (RS) images are being applied in building change detection (BCD) techniques. Methods based on convolutional neural network (CNN) have achieved excellent success in BCD techniques due to their excellent feature discrimination ability. However, CNN relies heavily on the geometry of prior conditions and is limited by the size of the convolution kernel, making it easy to ignore global information. This makes it difficult to capture the long-range dependence of different building targets and handle complex spatial relationships in high-resolution satellite RS images. Considering that graph convolutional neural networks (GCNs) have powerful internal relationship learning capabilities, we propose a multiscale attention fusion graph network (MAFGNet) in this article. MAFGNet uses a dual graph convolution module (DGM), which includes a spatial graph convolution network (SGCN) and a channel graph convolution network (CGCN), to effectively explore the long-range relationship between the detection target and the global at the spatial and channel levels. We also design a multiscale attention fusion encoder that includes channel attention fusion module (CAFM) and spatial attention fusion module (SAFM) to effectively combine valuable information from multiscale features. In addition, an atrous context self-attention pyramid (ACSP) is designed to combine multiscale context to enhance the feature representation of change information. We conducted qualitative and quantitative comparative experiments on different datasets to validate the effectiveness of our model. The experimental results show that our method performs better than advanced methods in terms of overall accuracy (OA) and visualization details.