[GRASS-user] question on i.landsat.toa function

[Veronica Andreo]

Dear Gabriel,

As I mentioned in a previous email, the module expects a basename, so it
won't recognize the @mapsetname, be it permanent or any other. Therefore if
your Landsat bands names are for example, landsat_date_B1, landsat_date_B2,
landsat_date_B3 and so on, in the input parameter you only have to put
"landsat_date_B" and the module will read all the bands available in the
mapset with that basename.

As output, you need to set a basename again.

Please, take a look at the examples in the manual page (
https://grass.osgeo.org/grass76/manuals/i.landsat.toar.html). If there's
anything that doesn't seem clear there, let us know so we can enhance it.

Best,
Vero


El dom., 16 jun. 2019 a las 22:30, Gabriel Cotlier (<gabiklm01 at gmail.com>)
escribió:

> Hello,
>
> I tried it to get radiance from command line too but had an error as well
> with metadata recognition:
>
>
> [image: image.png]
> Thanks a lot
>
>
> On Sun, Jun 16, 2019 at 5:19 PM Gabriel Cotlier <gabiklm01 at gmail.com>
> wrote:
>
>> Dear Vero,
>>
>> I could finally load the landsat 8 L1C data, is just two bands 4 and 5
>> for NDVI calculation, didn't created a mapset just used PERMANT, but my
>> workflow is
>>
>> Step 1 - DN>Radiance with
>> *i.landsat.toar *
>> Step* 2- Raniance> Surface_Reflectance  with i.atcorr *using different
>> methods DOS2 and DOS4 to compare
>>
>> *For step 1: to get radinace from DN*
>>
>> A) set working directory where the data is:
>>
>> cd
>> "C:\Users\Gabriel\Documents\grassdata\LC08_L1TP_227083_20180315_20180320_01_T1"
>>
>> B) calculate Radiance for each band separately :
>>
>> i.landsat.toar -r
>> input=LC08_L1TP_227083_20180315_20180320_01_T1_B4 at PERMANENT
>> output=LC08_L1TP_227083_20180315_20180320_01_T1_B4_toar
>> metfile=C:\Users\Gabriel\Documents\grassdata\LC08_L1TP_227083_20180315_20180320_01_T1\LC08_L1TP_227083_20180315_20180320_01_T1_MTL.txt
>> sensor=oli8 date=2018-03-15 sun_elevation=45.06637424
>> product_date=2018-03-20
>>
>> however go the error was:
>> [image: image.png]
>> appears not to be reading the data from PERMANENT?
>> Thanks a lot
>> Gabriel
>>
>>
>>
>>
>>
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