An image from the Landsat 5 thermal channel (top) shows how
hot areas (red) correspond with urban areas (gray) in the false-color
image of Atlanta (below).
A UHIPP sampler
The images below are visible (left) and thermal
infrared (right) sections from the larger images covering each
city. Because each image has not been calibrated, absolute temperatures
will change after calibration, but the relative temperature differences
between surface types will not.
Baton Rouge, La.:The
yellow and red areas are hot, and generally correspond with roads
and buildings; blue and green areas are cool and indicate water
and vegetation. The bright red areas in this image are about
65 deg. C (149 deg. F); dark green and blue areas are around
25 deg. C (77 deg. F). The solid blue swatch of color flowing
down the left side is the Mississippi River. Links to 600x300-pixel,
227K JPG. Click here for the entire city in a 1600x977-pixel,
1.8 MB JPG.
Sacramento, Calif.: Sacramento
displays a little of everything, from blistering railyards to
the cool California River, in visible and thermal infrared images.The
white areas, mostly rooftops, are about 122 deg. C (140 deg.
F) and the dark areas are approximately 29-36 deg. C (85-96 deg.
F). The hottest spots are buildings, seen as white rectangles
of various sizes. Sacramento's rail yard is the orange area east
of the Sacramento River, which flows from top to bottom. In the
complete image, the state capitol is the red spot in the green
rectangle to the right center of the river. Links to 600x300-pixel,
227K JPG. Click here for the entire city in a 1600x979-pixel,
2 MB JPG.
Salt lake City, Utah:
Again, the yellow and red areas are hot and generally correspond
with roads and buildings; blue and green areas are cool and indicate
water and vegetation. The white areas are about 71 deg. C (160
deg. F); blue and green areas are approximately 29-36 deg. C
(85-96 deg. F). The complete image spans Salt Lake City from
about 300 West Street on the left edge of the image, to the foothills
of the Wasatch Mountains on the eastern edge. Links to 600x300-pixel,
235K JPG. Click here for the entire city in a 1661x977-pixel,
2 MB JPG.