I try to run FLAASH on a Landsat 8 image. I radiometrically corrected the image using FLAASH output parameters using ENVI 5.4. It gives me the error message:

ACC error: modrd5:reading archive file header IDL error: READU: End of file encountered. Unit: 102, File: [file path]\acc.modroot.fla 
ACC_MODRD5 <( 9)>
ACC_HYPER2 <(550)>
ACC_ACC <(191)>
$MAIN$ <( 0)>

1 Answer 1


I had a similar error. In my case, it appears that I made a mistake on the "Ground Elevation (km)" parameter on the "FLAASH Atmospheric Correction Model Input Parameters" dialog box which must be in kilometres and not metres.

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