关键词: 遥感影像; 水体信息; 快速提取; 波谱分析; NNDWI;

Abstract: Accurate extraction of water body information is of great significance in water resources survey.The traditional index model has many shortcomings in detecting water information from remote sensing image, such as complex process, multi-links and large threshold selection error.Therefore, this paper proposes a new improved rapid water extraction method that is New Normalized Difference Water Index(NNDWI).Based on the analysis of the spectrum characteristics of water bodies and non-water bodies, this method combines the three bands of red, green and near-infrared to increase the reflection difference between water bodies and background ground objects.This method can quickly obtain water body information by result binarization, and comprehensively compare with traditional index methods.The results show that this method is less limited by image type, geographic location and imaging time, and can effectively avoid manual threshold selection errors, which has high extraction accuracy and obvious effects, especially for scattered small water body information, and the overall accuracy can reach 94.81%.

Key words: remote sensing; water body information; rapid extraction; spectrum analysis; New Normalized Difference Water Index;