王春阳, 张英杰, 李长春, 芦碧波, 张合兵, 吴喜芳. 基于"残差-挤压激励"深度混合卷积网络的土地利用分类[J]. 农业工程学报, 2022, 38(1): 305-313. DOI: 10.11975/j.issn.1002-6819.2022.01.034
    引用本文: 王春阳, 张英杰, 李长春, 芦碧波, 张合兵, 吴喜芳. 基于"残差-挤压激励"深度混合卷积网络的土地利用分类[J]. 农业工程学报, 2022, 38(1): 305-313. DOI: 10.11975/j.issn.1002-6819.2022.01.034
    Wang Chunyang, Zhang Yingjie, Li Changchun, Lu Bibo, Zhang Hebing, Wu Xifang. Land use classification based on "residual error-squeeze excitation" deep mixed convolution network[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2022, 38(1): 305-313. DOI: 10.11975/j.issn.1002-6819.2022.01.034
    Citation: Wang Chunyang, Zhang Yingjie, Li Changchun, Lu Bibo, Zhang Hebing, Wu Xifang. Land use classification based on "residual error-squeeze excitation" deep mixed convolution network[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2022, 38(1): 305-313. DOI: 10.11975/j.issn.1002-6819.2022.01.034

    基于"残差-挤压激励"深度混合卷积网络的土地利用分类

    Land use classification based on "residual error-squeeze excitation" deep mixed convolution network

    • 摘要: 土地利用变化的监测需要高精度的土地利用分类图,遥感技术的发展为这一工作提供了便利。然而,传统分类方法往往无法针对性的利用影像中的信息,其分类结果中地物边缘信息模糊,分类精度不高且噪声较大,难以满足土地变化监测的需要。该研究针对传统方法分类结果不理想的问题,提出一种基于"残差-挤压激励"单元的混合卷积神经网络模型,采用膨胀卷积层对影像进行"光谱-空间"特征提取,并引入"残差-挤压激励"单元,实现特征重用的同时,选择性的强调信息性特征,对噪声性特征进行抑制,最后对得到的特征进行整合实现对遥感影像的分类。该研究提出的模型与k-最邻近算法(K-Nearest Neighbor, KNN)、支持向量机(Support Vector Machine, SVM)、二维卷积网络(2D- Convolutional Neural Network, 2D-CNN)以及混合卷积网络(HybridSN)相比,在试验数据集上总体精度分别提高了11.15个百分点、11.18个百分点、0.06个百分点和2.46个百分点。且有效减少了地物边缘信息的损失,验证了该方法的有效性。此外,基于该方法分类结果统计出的耕地面积与试验区真实耕地面积仅相差0.77%,误差绝对值远低于其他分类方法。

       

      Abstract: A high-precision satellite imagery has enabled to near real-time monitor the land use change via the classification maps using remote sensing. However, the traditional classification cannot fully meet the current requirements of land change monitoring. Particularly, the images were often blurred with the feature edge and noisy information, leading to a low accuracy classification. In this study, a hybrid Convolutional Neural Network (CNN) model was proposed to accurately classify the land use using a “residual error-squeeze excitation” unit. An expanded convolutional layer was also used in the 3D-2D-CNN, instead of the part of the network structure than before. The “spectral-spatial” features were first extracted from the image using an inflated convolutional layer, and then the perception field of the convolutional kernel was expanded to accommodate the extracted features with different sizes in the less complexity of the model, finally a “residual error-squeeze excitation” unit was introduced in this framework. The input of the unit was directly added to activate the output in the residual link, where a better performance of the model was achieved to avoid the degradation of deep neural networks during natural constant mappings. A squeeze excitation module was adaptively recalibrated the feature responses between channels during the explicit modeling. As such, the interdependence between channels was obtained to realize the feature reuse for the selective emphasis on the informative features. The noise was suppressed from the interdependencies between channels using explicit modeling. After that, a depth-separable convolutional layer was used for the further feature extraction. The final classification of remote sensing images was achieved through a fully connected layer using the Softmax activation function. Taking the 2020 Jiaozuo Landsat-8 image data as an example, the overall accuracy of the model was improved 11.15, 11.18, 0.06, and 2.46 percentage points, respectively, compared with the K-Nearest Neighbor, Support Vector Machine (SVM), 2D-CNN, and Hybrid SN. Furthermore, the Kappa coefficient and the average accuracy were ranked the first, 0.97 and 91.81%, respectively. It infers that the improved model can be widely expected to classify the common feature types. In addition, the least loss of information was obtained about the linear features (such as roads and rivers) and the edge of features in the test area, while ensuring high accuracy. Anyway, the improved model can present a high universality to effectively achieve the higher accuracy and quality classification of Landsat than before.

       

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