The straight boundary marking changes in farming patterns is the border with Mexico. NASA Photograph This Landsat image of a portion of the Apollo 9 scene uses a combination of near-infrared and visible wavelengths. The smooth surface of the dune field appears dark, while the rough texture and orientation of the mountains give them a brighter appearance. The light and dark patterns in the Sea are due to variations in the water surface caused by the blowing wind. NASA Image A color composite image showing the Washington, DC area.
Numerical values indicate the brightness levels of individual pixels in digital images.
Different wavelengths are assigned to different primary colors and then combined to produce a false-color image. The San Andreas Fault extends from the upper left to the lower right on this radar image from the Seasat satellite which operated in 1978. NASA Image Seasat radar view of the folded Appalachian Mountains. NASA Image Landsat image of the Western Desert of Egypt showing the location of the SIR-A overlay. In 1978 Seasat operated for 98 days and acquired enough data to produce imagery of 100 million square kilometers of the Earth's surface.