Bulletin of Surveying and Mapping ›› 2024, Vol. 0 ›› Issue (11): 21-26.doi: 10.13474/j.cnki.11-2246.2024.1104

Previous Articles    

Automatic extraction of water body using multi-feature index

ZHANG Baowen, ZHAO Zhan   

  1. School of Surveying and Geo-Informatics, Shandong Jianzhu University, Jinan 250101, China
  • Received:2024-03-11 Published:2024-12-05

Abstract: At present, water extraction is still a semi-automatic method, which has low efficiency and is prone to omissions and extraction errors. In this paper, an automatic water extraction method using multi-feature index is proposed. Vegetation index, water index, improved water index and building land index are used to automatically extract water and non-water samples, and the classifier is trained to realize high-precision and automatic urban water extraction. Four typical experimental areas with different geographical conditions at home and abroad are selected for comparison and analysis with the traditional extraction method. Under this method, high extraction accuracy is achieved in all the four experimental areas, and Kappa coefficient reached above 0.94. Compared with single-band threshold method, Kappa coefficient increases by 7.2% on average. Compared with the water index method, Kappa coefficient increased by 3.8% on average.

Key words: water extraction, multi-source data, water index, automatic extraction, accuracy evaluation

CLC Number: