Geoscience Reference
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Plate 6 This nighttime image of the Phoenix, Arizona, metropolitan area is from the Advanced Spaceborne Thermal
Emission and Reflection Radiometer (ASTER) for October 3, 2003 at approximately 22:39:00 local time. A color ramp has
been applied to highlight relatively hot and cool surfaces; the corresponding temperature scale is in 8 C. Urbanmaterials, such
as the asphalt street grid and Sky Harbor Airport exhibit relatively high surface temperatures, while heavily vegetated regions
(mesic neighborhoods, riparian zones, agricultural fields) are relatively cool. Sparsely vegetated mountain ranges comprised
of exposed massive bedrock and block talus also have relatively high surface temperatures compared to other natural
surfaces. North is towards the top of the image. (Image source: WilliamL. Stefanov, Johnson Image Analysis Laboratory, NASA
Johnson Space Center, Houston, TX. Original unprocessed ASTER data (AST_08 surface temperature product) from NASA/
ERSDAC)
 
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