ABSTRACT: New gridded lightning climatology datasets are compiled and released from a series of low-Earth-orbiting NASA lightning sensors: the Optical Transient Detector (OTD), Tropical Rainfall Measuring Mission (TRMM) Lightning Imaging Sensor (LIS), and International Space tation (ISS) LIS. OTD collected data during April 1995-March 2000, TRMM LIS collected data during December 1997- April 2…