ASTER consists of three different subsystems (Figure 2): the Visible and Near-infrared (VNIR) has three bands with a spatial resolution of 15 m, and an additional backward telescope for stereo; the Shortwave Infrared (SWIR) has 6 bands with a spatial resolution of 30 m; and the Thermal Infrared (TIR) has 5 bands with a spatial resolution of 90 m.