[GRASS-user] question on Landsat 8 processing

[Gabriel Cotlier]

Thanks a lot I will try all bands.
Best regards,
Gabriel

On Tue, Jun 18, 2019 at 9:36 AM Carlos Henrique Grohmann de Carvalho <
carlos.grohmann at gmail.com> wrote:

> Indeed it needs ALL bands.
>
> I used this module in class a couple of weeks ago. You need to import and
> use all bands, including the panchromatic.
>
> Carlos
>
>
>
> On Tue, Jun 18, 2019 at 9:32 AM Veronica Andreo <veroandreo at gmail.com>
> wrote:
>
>> Seems to me that the module needs all Landsat bands. Try importing all of
>> them
>>
>> Vero
>>
>> El lun., 17 jun. 2019 a las 15:54, Gabriel Cotlier (<gabiklm01 at gmail.com>)
>> escribió:
>>
>>> Dear Vero, Nikos and Markus,
>>>
>>> I'm trying to get an NDVI from different preprocessing atmospheric
>>> correction methods DOS1, DOS2, DOS 2b, DOS3, DOS4. However, unsuccessfully,
>>> I'm not being able to run my supposed workflow on GRASS GIS which is:
>>>
>>> Step 1. DN to TOA Radiance ( *i.landsat.toar*)
>>> Step 2. TOA Radiance to Land Surface Reflectance  (*i.atcorr*)
>>>
>>> that thought maybe is the correct workflow for Landdsat 8 Level 1
>>> products, maybe is not?
>>>
>>> Since I need it only for Band 4 and Band 5 I proceeded as follows:
>>>
>>> 1. in a grassdata directory named with the correspondent Landsat 8 scene
>>> "LC82270832018074LGN00" I put Band 4 and Band 5 together with the MTL
>>> metadata txt file.
>>>
>>> 2. set a "Location" for this data set using Band 4 data by reading
>>> projection and Datum from Band 4.
>>>
>>> 3.started grass gis and d.rast for displaying the already automatically
>>> loaded Band 4
>>>
>>> 5. import with r.in.gdal Band 5 using Band 5 complete name as was Band 4
>>> loaded "LC82270832018074LGN00_B5"
>>>
>>> [image: image.png]
>>> 6. I changed working directory to where the data is:
>>>
>>> [image: image.png]
>>> 7. in command line (the withe one in grass interface) I tried to
>>> *i.landsat.toar* for obtaining TOA Radiance as follows :
>>>
>>> i.landsat.toar -r input=LC82270832018074LGN00_B
>>> output=TOAR_LC82270832018074LGN00_B metfile=LC82270832018074LGN00_MTL.txt
>>> sensor=oli8 date=2018-03-15 sun_elevation=45.06637424
>>> product_date=2018-03-20
>>>
>>> and the resulting error was:
>>>
>>> [image: image.png]
>>>
>>> I do not really understand what could be happening related to the bands
>>> names?
>>>
>>> Thanks a lot I will appreciate a way to solve this problem. May target
>>> is to get finally both bands 4 and 5 radiometrically callibrated and
>>> further atmospherically corrected with *i.atcorr*  using different DOS
>>> methos.
>>>
>>> Thanks a lot again for the help and guidance.
>>>
>>> Gabriel
>>>
>>> _______________________________________________
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>
>
>
> --
> Prof. Carlos Henrique Grohmann
> Institute of Energy and Environment - Univ. of São Paulo, Brazil
> - Digital Terrain Analysis | GIS | Remote Sensing -
>
> http://carlosgrohmann.com
> http://orcid.org/0000-0001-5073-5572
> ________________
> Can’t stop the signal.
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