C. Water
It performed well for large scale of water body, but those
narrow rivers failed to be extracted due to the limitation of
spatial resolution. Thus, manual editing of the classification
result is essential. First, transform the water body in the
classification into vectors and subsequently superimpose these
vectors on the original TM image. Then, depict the vectors of
water bodies like rivers and delete the hillshades that have been
mistakenly grouped into water.