[GRASS-user] question on Landsat 8 processing

[Gabriel Cotlier]

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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