i.aster.toar Calculates Top of Atmosphere Radiance/Reflectance/Brightness Temperature from ASTER DN. Imagery (i.*) ParameterMultipleInput|input|Names of ASTER DN layers (15 layers)|3|False ParameterNumber|dayofyear|Day of Year of satellite overpass [0-366]|0|366|0|False ParameterNumber|sun_elevation|Sun elevation angle (degrees, < 90.0)|0.0|90.0|45.0|False ParameterBoolean|-r|Output is radiance (W/m2)|False ParameterBoolean|-a|VNIR is High Gain|False ParameterBoolean|-b|SWIR is High Gain|False ParameterBoolean|-c|VNIR is Low Gain 1|False ParameterBoolean|-d|SWIR is Low Gain 1|False ParameterBoolean|-e|SWIR is Low Gain 2|False OutputDirectory|output|Output Directory