This is a known issue in FLAASH when detecting the sensor type. Try setting the sensor to Unknown, then manually set the sensor altitude. Next, in the Multispectral Parameters, set the filter function to the Worldview3.sli from the \ENVI5.x\classic\filt_func directory. Set the index to start at 9 (where the SWIR bands start). This should allow it to continue to run.

With regards to using the single Pan band in FLAASH, single band files are not supported in FLAASH. You could possibly stack the pan band with the VNIR or SWIR bands but it would require you resample one of the data sets up or down. It may also require that you create a custom filter function depending on the bands that are stacked. I would not use ACM on the pan sharpened results if you want to retain the spectral integrity of the MS bands.

Thanks Mari for the quick reply, extremely helpful!

Sorry to bring this back up, but I've tried to follow your instructions this morning and now have different errors. There are three error messages popping up when I click 'Apply': - 'Illegal subscript range: CHANNEL_DATA' Same as above 'Variable is undefined: VIZ'. Any help would be greatly aprpeciated.

Can you post the contents of template.txt that is created in the output directory specified in the flaash dialog?

; ;ENVI FLAASH PARAMETERS TEMPLATE (5.4) ;Written Tue Feb 21 14:20:56 2017 ; ; Project Parameters enviacc.prj.radiance_file = R:\NERC-STEED\WorldView\2016_radiometric_calibration\MS\16AUG14024806-M2AS_R1C1.dat enviacc.prj.reflect_file = R:\NERC-STEED\WorldView\2016_corrected\16AUG14024806-M2AS_R1C1_FLAASH enviacc.prj.filter_func_file = C:\Program Files\Harris\ENVI54\classic\filt_func\worldview3.sli enviacc.prj.filter_func_file_index = 9 enviacc.prj.water_band_choice = 1.13 enviacc.prj.red_channel = 5 enviacc.prj.green_channel = 3 enviacc.prj.blue_channel = 1 enviacc.prj.water_abs_channel = 0 enviacc.prj.water_ref_channel = 0 enviacc.prj.kt_upper_channel = 0 enviacc.prj.kt_lower_channel = 5 enviacc.prj.kt_cutoff = 0.0800 enviacc.prj.kt_ratio = 0.5000 enviacc.prj.cirrus_channel = 0 enviacc.prj.water_retrieval = 0 enviacc.prj.user_stem_name = 16AUG14024806-M2AS_R1C1_FLAASH_ enviacc.prj.modtran_directory = R:\NERC-STEED\WorldView\2016_corrected\FLAASH_process_files\ ; ; MODTRAN Parameters enviacc.modtran.visvalue = 40.0000 enviacc.modtran.f_resolution = 15.0000 enviacc.modtran.day = 14 enviacc.modtran.month = 8 enviacc.modtran.year = 2016 enviacc.modtran.gmt = 2.8017 enviacc.modtran.latitude = 4.9752 enviacc.modtran.longitude = 117.7841 enviacc.modtran.sensor_altitude = 617.0000 enviacc.modtran.ground_elevation = 0.0000 enviacc.modtran.view_zenith_angle = 180.0000 enviacc.modtran.view_azimuth = 0.0000 enviacc.modtran.atmosphere_model = 1 enviacc.modtran.aerosol_model = 1 enviacc.modtran.multiscatter_model = 2 enviacc.modtran.disort_streams = 8 enviacc.modtran.co2mix = 390.0000 enviacc.modtran.water_column_multiplier = 1.0000 ; ; Image Parameters enviacc.img.nspatial = 4096 enviacc.img.nlines = 4096 enviacc.img.data_type = 4 enviacc.img.margin1 = 0 enviacc.img.margin2 = 0 enviacc.img.nskip = 0 enviacc.img.pixel_size = 1.2000 enviacc.img.sensor_name = UNKNOWN-MSI ; ; Analysis Parameters enviacc.ana.aerosol_scaleht = 1.5000 enviacc.ana.use_adjacency = 1 enviacc.ana.output_scale = 10000.0000 enviacc.ana.output_diagnostic_files = 0 enviacc.ana.auto_save_template = 1 enviacc.ana.polishing_res = 0 enviacc.ana.aerosol_retrieval = 1 enviacc.ana.calc_wl_correction = 0 enviacc.ana.reuse_modtran_calcs = 0 enviacc.ana.use_square_slit_function = 0 enviacc.ana.convolution_method = fft enviacc.ana.use_tiling = 1 enviacc.ana.tile_size = 100.0000 ; ; GParameters Parameters enviacc.gparameters.gfact = 0 enviacc.gparameters.gval = 0.0000 enviacc.gparameters.use_lr_method = 0 enviacc.gparameters.multikernel = 1 enviacc.gparameters.autoroi = auto enviacc.gparameters.selarg = a ; ; Spectral Parameters enviacc.spc.wavelength_units = nanometer enviacc.spc.lambda = [ 425.0000, 480.0000, 545.0000, 605.0000, 660.0000, 725.0000, 832.5000, 950.0000] enviacc.spc.fwhm = [ 50.000000, 60.000000, 70.000000, 40.000000, 60.000000, 40.000000, 125.000000, 180.000000] enviacc.img.p_input_scale = [ 1.0000, 1.0000, 1.0000, 1.0000, 1.0000, 1.0000, 1.0000, 1.0000]

I am sorry. I understood this error was only occurring with the SWIR bands of WV-3 but it appears it is also happening with the VNIR bands. In this case, do the same steps as before - set the sensor to Unknown and select the WV3.sli but set the index to be 1. I will update the current bug report to reflect that this occurs with the VNIR bands as well as the SWIR.