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  • Specific features of NDVI, NDWI and MNDWI as reflected in land cover categories
    194-202
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    941

    The remote sensing techniques provide a great possibility to analyze the environmental processes in
    local or global scale. Landsat images with their 30 m resolution are suitable among others for land
    cover mapping and change monitoring. In this study three spectral indices (NDVI, NDWI, MNDWI) were
    investigated from the aspect of land cover types: water body (W); plough land (PL); forest (F); vineyard
    (V); grassland (GL) and built-up areas (BU) using Landsat-7 ETM+ data. The range, the dissimilarities
    and the correlation of spectral indices were examined. In BU – GL – F categories similar NDVI values
    were calculated, but the other land cover types differed significantly. The water related indices (NDWI,
    MNDWI) were more effective (especially the MNDWI) to enhance water features, but the values of other
    categories ranged from narrower interval. Weak correlation were found among the indices due to the
    differences caused by the water land cover class. Statistically, most land cover types differed from each
    other, but in several cases similarities can be found when delineating vegetation with various water
    content. MNDWI was found as the most effective in highlighting water bodies.