Semantic segmentation is an essential part of deep learning. In recent years, with the development of remote sensing big data, semantic segmentation has been increasingly used in remote sensing. Deep convolutional neural networks (DCNNs) face the challenge of feature fusion: very-high-resolution remote sensing image multisource data fusion can increase the network's learnable information, which is conducive to correctly classifying target objects by DCNNs; simultaneously, the fusion of high-level abstract features and low-level spatial features can improve the classification accuracy at the border between target objects. In this paper, we propose a multipath encoder structure to extract features of multipath inputs, a multipath attention-fused block module to fuse multipath features, and a refinement attention-fused block module to fuse high-level abstract features and low-level spatial features. Furthermore, we propose a novel convolutional neural network architecture, named attention-fused network (AFNet). Based on our AFNet, we achieve state-of-the-art performance with an overall accuracy of 91.7% and a mean F1 score of 90.96% on the ISPRS Vaihingen 2D dataset and an overall accuracy of 92.1% and a mean F1 score of 93.44% on the ISPRS Potsdam 2D dataset.

本文提出了一种多路径编码器结构来提取多路径输入的特征，多路径注意力融合块模块来融合多路径特征，以及细化注意力融合块模块来融合高层抽象特征和低层空间特征。同时，提出了一种新的卷积神经网络架构，名为注意力融合网络(AFNet)。基于该AFNet，在ISPRS Vaihingen 2D数据集上达到了91.7%的整体精度和90.96%的平均F1分数，在ISPRS Potsdam 2D数据集上达到了92.1%的整体精度和93.44%的平均F1分数，取得了最先进的性能。

用于语义分割的融合注意力网络，在极高分辨率遥感图像中的应用