The great meridian | density | mapping coastal pollution | frontier | land-use | energy-use | utility pollution | solar | high hazard areas
Satellite Map of the
USA in 1990
red on the map at left is forested area shown in red and the green is grassland
vegetation. That map is a composite of satellite
images taken in the infrared range of the electromagnetic
spectrum. That map on the right is a physical representation of the nation's elevations and principle mountain systems; the lower lying areas are in green.
Find the middle of
Texas and identify the black vertical band that forms an imaginary line from top to bottom of this image, The
line running from north to south, that you should draw on the printout
of this map above is the 100th Meridian.
The one hundredth meridian,
or line of longitude is the imaginary demarcation between the arid --nearly
rainless-- west and the more humid east where there is ample rainfall
for farming to occur.
The great meridian | N.A. density | mapping coastal pollution | land-use | energy-use | utility pollution | solar | high hazard areas
State historical census data 1790-2010
The red or maroon
areas on this map below is heavily populated areas shown surrounded by
agricultural areas in orange hues and tall forests in blue; the green is tundra, or a form of lichen and intermixed short brush with grassland vegetation. Grazing and mountain lands are shown in the pinkish hue