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

[Nick Ves]

On Wed, Sep 4, 2013 at 10:17 AM, Nikos Alexandris
<nik at nikosalexandris.net>wrote:

> On Friday 30 of August 2013 02:56:14 Beatrice wrote:
>
> > Dear All,
>
> Good Day Beatrice,
>
>
> > 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
>
>
> This doesn't look healthy.  However, I think it is a past problem which is
> fixed.
>
>
> > 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?
>
> I doubt that r.info has a problem reading the metadata that pertain to a
> queried raster map.  If I am not wrong, it merely reads simple text files
> that
> reside inside the "hist" directory inside the corresponding Mapset.
>
> My guess is that you use an older version of i.landsat.toar whicj, indeed,
> produces empty raster maps.  Unfortunately, I do not use (nor have any
> access
> to a Windows machine) so as to be in position to help directly.  We need
> feedback from someone with a Windows OS.
>
> (
> On/Off-Topic:  is there a way to run and test GRASS in an emulated Windows
> environment for those who don't have a legally licensed Windows OS?
> )
>
> ​There are two options that I am aware of:

1) Create a virtual machine and install windows on it (meh..)

2) Use WINE, which as they state in their site  they are "a compatibility
layer capable of running Windows applications on several POSIX-compliant
operating systems".

http://www.winehq.org

​Nikos.​




> Best, Nikos
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