How to Calculate NDWI using QGIS | Extract Waterbodies from Satellite Imageries

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NDWI stands for Normalized Difference Water Index. It's a spectral index commonly used in remote sensing and GIS to highlight water bodies in satellite imagery. NDWI is calculated by taking the normalized difference between the reflectance values of two specific bands, typically the Near-Infrared (NIR) and Shortwave Infrared (SWIR) bands. This index is effective because water absorbs strongly in the NIR and SWIR regions, leading to low reflectance values, which NDWI exploits to identify water bodies.
NDWI = (Band 3 - Band 5)/(Band 3 + Band 5)

Пікірлер: 3

  • @isaacadjei1325
    @isaacadjei13252 ай бұрын

    Please in calculating ndwi, do we download only one satellite image or different images with varied bands?

  • @SurveyingSolution

    @SurveyingSolution

    2 ай бұрын

    Hello Isaac. You download one Imagery or Product with its bands.

  • @user-ze7rn1gi9j
    @user-ze7rn1gi9jАй бұрын

    Good morning. I'm your new subscriber. Pls can you make a video on how to delineate waterlogged areas using Landsat 8 and MNDWI in ArcGIS😭🙏 It's for my final project😢