Automatic observation of cloud cover by the infrared scanning Nubiscope instrument mounted on the rooftop of the ECSF station building. The geographic coverage is given by the visible sky from the installation point and roughly matches the San Francisco river catchment basin.
For technical details and capabilities of the instrument please refer to nubiscope.eu and www.knmi.nl/~wauben/Sensor/TECO2010_1(8)_Waubenetal.pdf