The drone whirs to life on a driveway in the Spanish Hills neighborhood of Boulder County. Its four spinning motors lift it to nearly 200 feet above the ground. Below, the cul-de-sac comes into view, revealing the stone chimneys and blackened foundations that dot the hillside—what remains of many of the houses in this neighborhood after flames swept through on Dec. 30 and into the morning of Dec. 31 during what would become known as the Marshall Fire.
