The U.S. Postal Service kicks off National Stamp Collecting Month in October by issuing "Earthscapes" Forever stamps.
"Earthscapes" depict American landscapes from several hundred feet to several hundred miles above the earth. The images were taken from ultra-light planes to satellites.
Two of the stamp images -- "Volcanic Crater" and "Center-Pivot Irrigation" -- were taken by the NASA/U.S. Geological Survey Landsat 7 satellite.
The "Center-Pivot Irrigation" image was taken above Kansas. Red circles indicate healthy, irrigated crops; lighter circles represent harvested crops. Corn, wheat, alfalfa, soybeans and grain sorghum account for most of the irrigated acreage in the state.
The "Earthscapes" Forever stamps go on sale October 1.