Accurate extraction of surface water in complex environment based on Google Earth Engine and Sentinel-2

PLoS One. 2021 Jun 18;16(6):e0253209. doi: 10.1371/journal.pone.0253209. eCollection 2021.

Abstract

To realize the accurate extraction of surface water in complex environment, this study takes Sri Lanka as the study area owing to the complex geography and various types of water bodies. Based on Google Earth engine and Sentinel-2 images, an automatic water extraction model in complex environment(AWECE) was developed. The accuracy of water extraction by AWECE, NDWI, MNDWI and the revised version of multi-spectral water index (MuWI-R) models was evaluated from visual interpretation and quantitative analysis. The results show that the AWECE model could significantly improve the accuracy of water extraction in complex environment, with an overall accuracy of 97.16%, and an extremely low omission error (0.74%) and commission error (2.35%). The AEWCE model could effectively avoid the influence of cloud shadow, mountain shadow and paddy soil on water extraction accuracy. The model can be widely applied in cloudy, mountainous and other areas with complex environments, which has important practical significance for water resources investigation, monitoring and protection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Environmental Monitoring / methods*
  • Satellite Imagery*
  • Sri Lanka
  • Water Resources*
  • Water*

Substances

  • Water

Grants and funding

This paper was supported by Tianjin Intelligent Manufacturing Project: Tianjin-IMP-2018-2, the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDA2003030201), the National Natural Science Foundation of China (Nos. 41771388, 41971359), and Technology Innovation Center for Land Engineering and Human Settlements, Shaanxi Land Engineering Construction Group Co.,Ltd and Xi’ an Jiaotong University (No. 2021WHZ0090). The funder provided support in the form of salaries for authors [Li JF, Peng B, Wei YL], but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The specific roles of these authors are articulated in the ‘author contributions’ section.