[GRASS-user] i.landsat.toar comments have only 0 value

[Beatrice]

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.





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