In the middle of a heat wave this month, Portland State University researchers Vivek Shandas and Jackson Voelkel drove across the city of Portland with a thermometer sticking out the window.
The thermometer was connected to a GPS unit. Together the two devices logged the temperature and location every second as the car moved along city streets. As they drove past the Portland International Airport, Shandas noted lots of asphalt and a near total lack of trees.
"This is one of the hottest places in the city," he said.