Comparative study of water-body extraction methods based on Landsat8 remote sensing images

This paper analyzes several commonly used extraction methods of surface water bodies information, including the CIWI (Combined Index of NDVI and NIR for Water Body Identification) model, normalized difference water index (NDWI) and near-infrared band model and the multiband spectral relationship method, and compares the effects on water body identification in the boundary river basin based on the accuracy results. The results show that the new type of water index—CIWI model has advantages in the water-body information extraction. This model can effectively separate the information of waterbody, vegetation, cloud shadows, urban land and other information, with extraction accuracy more than 90%, achieving the extraction of water-body information in the study area.