Dear All, I have been running i.landsat.toar but have just noted this problem. For me it shows zeros both in the command output (verbose) and output metadata (r.info). An example for one of the bands:
>From command output: LANDSAT: 5 SENSOR: TM ACQUISITION DATE 2011-07-05 [production date 2011-11-29] Earth-sun distance = 0.00000000 Solar elevation angle = 0.00000000 Atmospheric correction = dos4 Percent of solar irradiance in path radiance = 0.0000 ------------------- BAND 1 (code 1) calibrated digital number (DN): 0.0 to 0.0 calibration constants (L): 0.000 to 0.000 at-surface radiance = 0.00000000 * DN + -0.000 mean solar exoatmospheric irradiance (ESUN): -0.000 at-surface reflectance = radiance / 0.00000 the darkness DN with a least 1000 pixels is 1 the DN mode is 53 ------------------- >From r.info for the same band: | Earth-sun distance (d) ................ -0.00000000 | | Digital number (DN) range ............. 0 to 0 | | Calibration constants (Lmin to Lmax) .. +0.000 to +0.000 | | DN to Radiance (gain and bias) ........ +0.00000 and +0.00000 | | Mean solar irradiance (ESUN) .......... 0.000 | | Reflectance = Radiance divided by ..... 0.00000 | | | | Dark object (1000 pixels) DN = ........ 1 | | Mode in reflectance histogram ......... 0.00000 Running i.landsat.toar -p results to number=5 creation=2011-11-29 date=2011-07-05 sun_elev=45.585310 sensor=TM bands=7 sunaz=44.259879 Which I think confirms that i.landsat.toar can read input values from my metafile. The output bands have values in the range of surface reflectance/temperature (for band 6). For example Band 1 output - Range of data: min = 0.01 max = 0.461925184292249, Data Units: unitless Band 2 output - Range of data: min = 0.01 max = 0.925906812458597, Data Units: unitless Band 3 output - Range of data: min = 0.01 max = 0.785829845850446, Data Units: unitless . . Band 6 output - Range of data: min = 203.371307953013 max = 327.669907753679, Data Units: Kelvin I have same results when using MTL or MTLOld as source of metadata, on TM or ETM+ sensors and different atmospheric correction methods (uncorrected, DOS). I am running winGRASS7 revision 57466. Is there a problem with the printed output from r.info/command output or are these zeros the actual values that i.landsat.toar uses as input to computations? Thanks, Beatrice. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/i-landsat-toar-comments-have-only-0-value-tp5034509p5075199.html Sent from the Grass - Users mailing list archive at Nabble.com. _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
