Sacramento and Baton Rouge were observed in earlier overflights. Several other U.S. cities are participating through ground-based and satellite observations. Houston, Chicago, Los Angeles, Nashville, Phoenix, and Tucson will participate with satellite data only. Salt Lake City, Utah. Blue and green are cool and generally correspond with water and vegetation.
North is up.
From surface temperature estimates, the white areas are about 71 deg. Absolute temperatures will change after calibration, but the relative temperature differences between surface types will stay the same. Scattered around the city on three rooftops were instruments which measured the visibility or transmissivity of the atmosphere to aid in the calibration of the visible data. Luvall also noted the interesting cooling effect that the streamside vegetation has as streams flow from the mountains. Luvall said there is the tendency for engineers to ditch and concrete these areas in the city, which effectively removes the cooling streamside vegetation.