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Figure no 3: NDVI image resulting from Red and NIR bands of Landsat ETM+ imagery. The supervised classification of NDVI image is carried outusing SAGA-GIS tools available in QGIS (SAGA, Module Supervised Classification for Grids); particularly, the application of the Maximum Likelihood algorithm defines the following thresholds: -0.390 for water/soil and 0.287 for soil/vegetation. The resulting land cover map is shown in Figure no 4.
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GIS software allow functions which are suitable for processing remotely sensed images. Map Algebra tools and classification tools are just two examples of GIS functions usable to process remotely sensed data and obtain from them further information that can be represented in the form of thematic map.In a similar way, NDVI (Normalized Difference Veg...
