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Agreed with wafa mehmood. We can analyse images in ERDAS better than GIS but drawing in note easy in it. We have to use GIS for prepare maps from images.
i think that ERDAS Imagine is the best. ERDAS
In ERDAS we can clearly see pattern , texture of land use , vegetation and roads , based on the bands for images.
In GIS it is not possible .he bands for images
thanks