Identifying Urban Wetlands through Remote Sensing Scene Classification Using Deep Learning: A Case Study of Shenzhen, China

• Published in: ISPRS international journal of geo-information Vol. 11; no. 2; p. 131
• Main Authors: Yang, Renfei, Luo, Fang, Ren, Fu, Huang, Wenli, Li, Qianyi, Du, Kaixuan, Yuan, Dingdi
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.02.2022
• Subjects: Accuracy; Artificial neural networks; Case studies; Cities; Classification; Coastal waters; Comparative analysis; Deep learning; DenseNet121; Discriminant analysis; Ecosystem services; Image classification; Image resolution; Land surveys; Machine learning; Neural networks; Pattern analysis; Protection; Remote sensing; scene classification; Semantics; Shenzhen; standard deviation ellipse; Support vector machines; Swamps; Tidal flats; Urban areas; urban wetland; Urbanization; Wetlands; China
• ISSN: 2220-9964; 2220-9964
• DOI: 10.3390/ijgi11020131

Urban wetlands provide cities with unique and valuable ecosystem services but are under great degradation pressure. Correctly identifying urban wetlands from remote sensing images is fundamental for developing appropriate management and protection plans. To overcome the semantic limitations of traditional pixel-level urban wetland classification techniques, we proposed an urban wetland identification framework based on an advanced scene-level classification scheme. First, the Sentinel-2 high-resolution multispectral image of Shenzhen was segmented into 320 m × 320 m square patches to generate sample datasets for classification. Next, twelve typical convolutional neural network (CNN) models were transformed for the comparison experiments. Finally, the model with the best performance was used to classify the wetland scenes in Shenzhen, and pattern and composition analyses were also implemented in the classification results. We found that the DenseNet121 model performed best in classifying urban wetland scenes, with overall accuracy (OA) and kappa values reaching 0.89 and 0.86, respectively. The analysis results revealed that the wetland scene in Shenzhen is generally balanced in the east–west direction. Among the wetland scenes, coastal open waters accounted for a relatively high proportion and showed an obvious southward pattern. The remaining swamp, marsh, tidal flat, and pond areas were scattered, accounting for only 4.64% of the total area of Shenzhen. For scattered and dynamic urban wetlands, we are the first to achieve scene-level classification with satisfactory results, thus providing a clearer and easier-to-understand reference for management and protection, which is of great significance for promoting harmony between humanity and ecosystems in cities.