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Computer Basics: Data Used: Landsat 8; Operating System: Windows 7 32 bit; Grass version: 7.0.0.1 (Stable version) I have tried with 7.02.RC1-1 version, landsat 7 data, but there was no difference) My metadata file records the following values: SUN_ELEVATION = 49.52284282 EARTH_SUN_DISTANCE = 0.9939432 Also, RADIANCE_MULT_BAND_1 = 1.2709E-02 RADIANCE_ADD_BAND_1 = -63.54622 Similarly, none of the other band's radiance parameter is zero Issue # 01: The code is not picking up the Earth-sun distance or the Solar elevation angle from the metadata file. I even manually provided the data through the tool box 'Metadat' tab, but no difference made. There is a warning stating beforehand that it will be overwritten. Any explanation as to why? Issue # 02: As par USGS reference: http://landsat.usgs.gov/Landsat8_Using_Product.php , at-sensor radiance = RADIANCE_MULT_BAND_X * DN + RADIANCE_ADD_BAND_X However, the output is not using the metadata values. Instead using 0. Any explanation? I am coming across identical situation like the previous case, evident from the attached command output. Any guideline for solution (if required) or explanation for the circumstance (if this is how it is supposed to be)? Command Output: Mon Nov 30 02:30:07 2015) i.landsat.toar --verbose input=LC81370442015300LGN00_B output=TOAR_B metfile=E:\LandCover_Classification\LC81370442015300LGN00\LC81370442015300LGN00_MTL.txt sensor=oli8 date=2015-10-27 sun_elevation=49.52284282 product_date=2015-10-27 Metada file is MTL file: new format RADIANCE & QUANTIZE from MIN_MAX_(RADIANCE|PIXEL_VALUE) WARNING: ESUN evaluated from REFLECTANCE_MAXIMUM_BAND WARNING: Overwriting solar elevation of metadata file LANDSAT: 8 SENSOR: OLI/TIRS ACQUISITION DATE 2015-10-27 [production date 2015-10-27] Earth-sun distance = 0.00000000 /* Not using data from metedata file */ Solar elevation angle = 0.00000000 /* Not using data from metedata file */ Atmospheric correction: UNCORRECTED ------------------- BAND 1 (code 1) calibrated digital number (DN): 0.0 to 0.0 calibration constants (L): -12921358752688410020721955688 115920665908972319060407734713394360286772747253243677217490 460072444863477515873024485329406587544102380733964553773209 470174482838252720913256857159594704835548262628428491099806 824007743633806603939891682505986476500036813488471710794679 812718339464991426221557174273397692968656770569470784372007 509468405212310749439605762528891325540967113062645506423667 906579067093107701745245095315224335459710698106660563473926 87291100325217965687908018786027399961269512990865888378880. 00000 to 0.00000 at-sensor radiance = -0.00000000 * DN + -0.00000 /* Not using data from metedata file */ mean solar exoatmospheric irradiance (ESUN): 0.00000 at-sensor reflectance = radiance / -0.00000 ------------------- BAND 2 (code 2) calibrated digital number (DN): 0.0 to 0.0 calibration constants (L): -0.00000 to 0.00000 at-sensor radiance = -0.00000000 * DN + -0.00000 mean solar exoatmospheric irradiance (ESUN): -0.00000 at-sensor reflectance = radiance / -0.00000