Geography students sometimes struggle to understand infrared images which are increasingly used in satellite imagery. Mark Bjelland has a Sony cybershot camera modified for infrared photography and took the pictures shown here on September day. Digital cameras are sensitive to near infrared and come equipped with a hot mirror to remove the infrared. It was converted for IR use by removing the hot mirror and adding a filter that only allows 50% of the visible light to enter. Vegetation appears bright white in infrared photos because actively growing plants are highly reflective of near infrared radiation.