[GRASS-user] question on Landsat 8 processing

[Veronica Andreo]

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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