COGS is a four-dimensional (4D) map of cloudiness generated by multiview stereo reconstruction using the ARM stereo camera ring at the Southern Great Plains (SGP) atmospheric observatory. These data are particularly useful for studies of the life cycles and macrophysical attributes of shallow cumulus clouds. COGS covers a 6 km x 6 km x 6 km region at the SGP Central Facility centered at the position of the Doppler lidar. The grid resolution is 50 m in horizontal and vertical directions and 20 seconds in time. COGS is generated by stitching together three-dimensional (3D) reconstructed cloud points from the three pairs of ARM stereo cameras.