[GRASS-dev] [GRASS-user] i.landsat.toar fails to convert DNs (bands 61 and 62) to temperature for Landsat 7 scene

[Nikos Alexandris]

More details, using i.landsat.toar under `g.version -g`:

version=6.4.4svn
revision=58178


The uncorrected method delivers some "Temperatures" ??:

r.info -hr KR_B.Radiance.61

min=7.64787401574803
max=9.12377952755905
Data Source:
   
Data Description:
   generated by i.landsat.toar
Comments:
    Radiance of Landsat-7 ETM+ (method uncorrected)
   -----------------------------------------------------------------
    Acquisition date (and time) ........... 2002-07-14 (3.1864 h)
    Production date ....................... 2013-10-17
   
    Earth-sun distance (d) ................ 1.0165044
    Sun elevation (and azimuth) ........... 53.54784 (53.92998)
    Digital number (DN) range ............. 1 to 255
    Calibration constants (Lmin to Lmax) .. +0.00000 to +17.04000
    DN to Radiance (gain and bias) ........ +0.06709 and -0.06709
    Temperature (K1 and K2) ............... 0.000 and 0.000
   ------------------------------------------------------------------


but the DOS1 method does not:

r.info -hr KR_B.ToAR.DOS1.61

min=-nan
max=-nan
Data Source:
   
Data Description:
   generated by i.landsat.toar
Comments:
    Temperature of Landsat-7 ETM+ (method dos1)
   -----------------------------------------------------------------
    Acquisition date (and time) ........... 2002-07-14 (3.1864 h)
    Production date ....................... 2013-10-17
   
    Earth-sun distance (d) ................ 1.0165044
    Sun elevation (and azimuth) ........... 53.54784 (53.92998)
    Digital number (DN) range ............. 1 to 255
    Calibration constants (Lmin to Lmax) .. +0.00000 to +17.04000
    DN to Radiance (gain and bias) ........ +0.06709 and -0.06709
    Temperature (K1 and K2) ............... 0.000 and 0.000
   ------------------------------------------------------------------

Nikos
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