Research on the Application of GNDVI Water Body Index Based on GF-6 Images
Based on the spectral analysis of GF-6 images,this article uses the near-infrared band with the strongest reflectance to subtract the Coastal Blue band with the weakest reflectance and establishes a ratio relationship with the green band. Combining with a fixed step search method to obtain the step correction factor,the Green Wave Correction Difference Normalized Vegetation Index (GNDVI) is proposed,which is compared with other methods. The application value of this index in water extraction was studied,and the results showed that it can effectively and stably extract the spatial distribution of water bodies. The overall accuracy of the wa-ter extraction results in the research area is above 76％,F1 is above 0.68,and the Kappa coefficient is highly consistent. This pro-vides a technical reference for GF-6 imaging in water extraction.
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