SURFRAD Total Sky Imagers (TSIs)
SRRB collects data from Total Sky Imagers located at each SURFRAD site. The TSI consists of a web camera suspended over a convex mirror. The mirror has a black sun-blocking stripe, which rotates during the day to protect the camera's sensitive picture element from bright sunlight. Images of the sky are collected by a local computer, and processed into percent cloud cover data. Recent images, taken every 15-minutes, are available from the Boulder, Colorado and Desert Rock, Nevada sites. Daily cloud cover data are available for all sites. One-minute images from all sites are archived, but are not available on the web due to storage constraints. The raw image files may be requested for specific, short time periods.