A method for extracting dynamic threshold value of water body information in Beibu Gulf coastal area

doi:10.13474/j.cnki.11-2246.2022.0134

Abstract

Abstract: Accurate acquisition of water body distribution information and water body variation patterns is of great importance in the comprehensive management of watersheds. Based on the ocean water index (OWI), the correlation between OWI and the normalized difference vegetation index (NDVI) was analyzed based on the spectral characteristics of the water body. The method is based on the dynamic equilibrium of the two indices, and a dynamic threshold method with high stability is proposed and experimentally validated. The experimental results show that the dynamic threshold method can extract water body information stably and accurately, avoiding the error of artificially set thresholds, and the proposed index has good universality for both domestic high resolution images and the rest of optical images, which can be applied to the monitoring of coastal coastline.

Key words: coastal areas, water extraction, GF-6, remote sensing, multi-source data, dynamic threshold extraction

CLC Number:

P237

REN Chao, DENG Shiqin, GAO Maofang. A method for extracting dynamic threshold value of water body information in Beibu Gulf coastal area[J]. Bulletin of Surveying and Mapping, 2022, 0(5): 14-19,37.

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