Analysis of the use of NDWIgreen and NDWIred for inland water mapping in the Yellow River Basin using Landsat-8 OLI imagery
2017
Yan, Dajiang | Wang, Xuhong | Zhu, Xinming | Huang, Chang | Li, Wenping
Clear and green water bodies reflect more green light than red light, while brown water bodies reflect more red light than green light. It is thus believed that the normalized difference water indexes using the green band and infrared wavelengths (NDWI gᵣₑₑₙ) and the normalized difference water indexes using the red band and infrared wavelengths (NDWI ᵣₑd) would act differently in mapping inland water bodies with different colours. This study aims to evaluate the performance of NDWI gᵣₑₑₙ and NDWI ᵣₑd in mapping water bodies with different colours in the Yellow River Basin using the Landsat-8 Operational Land Imager (OLI) imagery. The results show that NDWI gᵣₑₑₙ and NDWI ᵣₑd achieve overall accuracy of 95.99–96.82% and 88.32–96.68% in clear water mapping, 95.58–96.35% and 93.50–94.60% in green water mapping, 88.12–92.63% and 90.08–93.10% in brown water mapping, respectively. It is shown that both NDWI gᵣₑₑₙ and NDWI ᵣₑd can serve the purpose of inland water mapping. Moreover, the comparative analysis suggests that NDWI gᵣₑₑₙ is more suitable for clear and green water mapping, while NDWI ᵣₑd is more adequate for brown water mapping.
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