trouble with i.landsat.toar failing to identify satellite

Question

I am trying to use the i.landsat.toar tool on L7 bands. I have tried to use both the MTL and MTLold, but no matter what I try, it returns "Failed to identify satellite." What am I doing wrong?

Answer 1

One thing I check explicitly for L5 is that the date of acquisition in the mtl/txt file matches the date of the file to be processed. You have to be aware of the naming convention of the files to do this.

I don't use a standard version of grass, but I expect the module should be the same for you, see this image

Also I just ran a Landsat 7 scene from 1999. For simplicity I treated it as Landsat 5, changing the 61 band to 6. I note that toar would not process that unless I used the mtlold.txt file which was included with scene, which I had only pulled from USGS yesterday. In that case I got the error:

ERROR: Unknown production date (defined by 'product_date')

The successful command was:

i.landsat.toar -t --verbose input_prefix=7_92811999348_ output_prefix=7_92811999348_toar metfile=E:\GIS_mega\7TM+ \Walgett_9281\LE70920811999348SGS01\LE70920811999348SGS01_MTLold.txt method=dos3

note the verbose option to give you some feedback.