The Corona images have a much
higher spatial resolution than the TM images. A possible way to
address this inconsistency is to decrease the spatial resolution of
the Corona images to that of TM (Bhatta, Saraswati, &
Bandyopadhyay, 2010). However, downscaling the Corona images
to a 30 m resolution would make it more difficult to differentiate
between urban and non-urban land, as the Corona images have
only one band. Thus, we interpreted the images directly and then
resampled the classified map to a 30 m resolution to address the
inconsistencies in spatial resolution between the different images.