This video is about creating different indices for classification. We can't predict many objects through our naked eye. The same object can reflect different numbers of spectrum in different conditions. For example, an object under direct sun and an object under shade may reflect different spectrum value. Therefore it will hard to detect the same object in different conditions. But the ratio of bands value will same for each object. And These indices are different bands ratios that will help us to detect an object easily.

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2:16 NDVI, vegetation index
5:49 NDBI, Builtup index
7:02 NDWI, Water index
9:10 NDMI, soil moisture index

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