Officials were careful to point out the images are being used only to aid in the effort to contain the fire.
In 2009 a NASA Predator equipped with an infrared imaging sensor helped the U.S. Forest Service assess damage from a fire in Angeles National Forest. In 2008, a drone capable of detecting hot spots helped firefighters assess movement of a series of wildfires stretching from southern California's Lake Arrowhead to San Diego.
The Rim Fire started Aug. 17 and quickly exploded in size, becoming one of the 10 largest California wildfires on record. Its progression slowed earlier this week when it moved from parts of the forest with thick underbrush that had not burned in nearly a century to areas that had seen fire in the past two decades.
But it will burn for months, possibly until California's dry season ends this fall.
"My prediction is it will burn until we see rain," said Hugh Safford, a regional ecologist with the U.S. Forest Service.
That means the smoke could continue to foul air north of Yosemite in the Lake Tahoe basin and neighboring Nevada, although residents received something of a reprieve Wednesday when for the first time in three days blue sky was sometimes visible through the haze.
The air quality index in the Reno area still had improved only to the "unhealthy" level, and in Douglas County, Nev., school children were kept indoors again when the index registered in the "hazardous" category.
The air was clear, however, in the tourist mecca of Yosemite Valley, home to the towering Half Dome and El Capitan rock formations and the 2,425-foot plunge of Yosemite Falls.
The Rim Fire has destroyed 111 structures, including 11 homes, and posed a threat to ancient giant sequoias.
The fire also has threatened San Francisco's water supply at the Hetch Hetchy Reservoir, but Stratton said it was burning itself out as it approached and that crews were lighting back burns to push it back into the wilderness.