Obtaining a ground-based lidar geometric form factor using coincident spaceborne lidar measurements.

We present a method to determine the geometric form factor of a ground-based lidar using simultaneous lidar measurements made from the ground and from space. The theoretical basis is described. The feasibility of the method is demonstrated by applying it to the measurement data acquired by the Cloud Aerosol Lidar Infrared Pathfinder Satellite Observation (CALIPSO) lidar and a ground-based lidar located at the Hampton University (37.02 degrees N, 76.34 degrees W). The geometric factors with different aerosol conditions are retrieved.