Landuse for urban and residential have typical road systems. Whereas agriculture has a landuse pattern for fields. The railway landuse system obvisously has a better , straighter landuse pattern than the automotive landuse sytem. Automotive landuse patterns dont go through natural obsticals. Yes, different vegitation cover can be identified.
Agricultureal land is more structured than nonurbanized and non farming land.
Spectral reflectance is the amount of light reflected from the land. Using one band at a time it is easier to interpret the landuse pattern images. Single band images are easiser to interpret. The advantage of combining bands is the greater contrast and higher reflectance in certain landuse features. The disadvantage of combining bands is that landuse features are not clear and seem to black and white.