eXcess
n growth
ween
ced slope
cate
d.
h (1977)
ted to
obtained
quations
r national
rview is
us, near
erview
rs which
to
h widths
Force,
ed into
n 16
ence and
f major
n energy
f the
mparison
| in the
ited urban
sists of
ted
es are
of the
h, in
Y
leir
; briefly
inced if
luminated
of the
Fig. 5 DMSP nighttime image of eastern United States.
Illuminated urban areas (IUA's) may be easily dis-
tinguished in areas not masked by clouds.
Fig. 6 The IUA as a three-dimensional domed figure in
which the z-coordinates are proportional to energy
consumption.