In south central Washington, sunny days and clear nights in early spring often mean growers need to protect their crops from potential frost injury. In April and May 2006, we flew nighttime thermal infrared imagery over a collaborator’s orchards in order to see patterns of air temperature distributed by wind machines. We were surprised to see areas in two blocks that were noticeably colder than the surrounding trees. These colder areas revealed in the thermal infrared imagery turned out to be rows with Extenday reflective ground cover installed. As an example, we can see this effect in the thermal infrared […]