Acta Geodaetica et Cartographica Sinica ›› 2024, Vol. 53 ›› Issue (6): 1212-1223.doi: 10.11947/j.AGCS.2024.20230543

• Smart Surveying and Mapping • Previous Articles     Next Articles

Multi-level contrastive learning for weakly supervised extraction of urban solid wastes dump from high-resolution remote sensing images

Jicheng WANG1(), Anmei GUO2,3, Li SHEN2,3(), Tian LAN2,3, Zhu XU2,3, Zhilin LI2,3   

  1. 1.Key Laboratory of Ministry of Education on Land Resources Evaluation and Monitoring in Southwest China, Sichuan Normal University, Chengdu 610066, China
    2.State-Province Joint Engineering Laboratory of Spatial Information Technology for High-Speed Railway Safety, Southwest Jiaotong University, Chengdu 611756, China
    3.Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
  • Received:2023-11-23 Published:2024-07-22
  • Contact: Li SHEN E-mail:wangjicheng11@my.swjtu.edu.cn;lishen@swjtu.edu.cn
  • About author:WANG Jicheng (1990—), male, PhD, majors in remote sensing image intelligent analysis. E-mail: wangjicheng11@my.swjtu.edu.cn
  • Supported by:
    The National Key Research and Development Program of China(2022YFB3904202);The National Natural Science Foundation of China(42394063);Sichuan Science and Technology Program(2023NSFSC19179);Science and Technology Project from Department of Natural Resources of Sichuan Province(2023JDKY0017-3)

Abstract:

Urban solid waste is a major pollutant in the urbanization process that endangers the urban ecology and public health. Intelligent interpretation of high-resolution satellite imagery for solid waste dumps (SWD) is crucial for automated monitoring. However, deep learning-based automatic extraction methods for SWD heavily rely on costly and labor-intensive high-quality pixel-level annotations. This paper presents a weakly supervised method that only uses image-level annotations to perform pixel-level SWD extraction. The method leverages the image characteristics of SWD and applies contrastive learning at both pixels, image levels under constraints of scale contrast to improve the class activation maps (CAMs) of SWD. Based on the CAMs, the method generates high-quality pixel-level pseudo-labels that are used to train the SWD extraction model. The experiments on a self-created SWD dataset demonstrate that the proposed method achieves an F1 score of 71.58% and an IoU score of 55.74%, which are significantly higher than the baseline methods. This shows that the multi-level contrastive learning-based weakly supervised method can produce more complete and accurate CAMs of SWD, leading to better extraction performance.

Key words: urban solid waste dump, high-resolution remote sensing images, contrastive learning, weakly supervised learning, class activation map

CLC Number: