straightforward to use. In this paper, the availability of the Landsat 4 and 5 Thematic Mapper
(TM) and Landsat 7 Enhanced Thematic Mapper Plus (ETM+) ARD over the conterminous
United States (CONUS) are quantified for a 36-year period (1 January 1982 to 31 December
2017). Complex patterns of ARD availability occur due to the satellite orbit and sensor
geometry, cloud, sensor acquisition and health issues and because of changing relative …