| 25 Oct 2011 03:17 PM |
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Hello,
I'm at the stage where I have my WV2 imagery in in BIL format and I wish to apply the FLAASH atmospheric correction (in ENVI 4.2) however I cannot seem to find the file that is I am being prompted for that asks enter "ASCII file containing wavelengths and fwhm". Any ideas at this point would be a great help.
Thanks.
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MariM
Veteran Member
Posts:2396  
| 27 Oct 2011 07:24 AM |
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Since WV data was not available when ENVI 4.2 came out, there is no special reader for this format that automatically assigns the wavelengths to the bands. So you will need to open the file as a TIFF and go to File ->Edit ENVI Header ->Edit Attributes ->Wavelengths and add in the band wavelength values before processing the file in FLAASH. Then when you select the file for input, it will no longer request you provide a text file listing the wavelengths. You can also provide the FWHM valuse but they are not required.
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Deleted User
New Member
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| 28 Oct 2011 10:01 AM |
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Thanks for that. Just to clarify - what wavelength measurements is required (centre of wavelength?) and in what units?
Thanks again.
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Deleted User
New Member
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| 28 Oct 2011 10:13 AM |
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It interprets the wavelengths that you add to the header as the band center wavelengths. You can specify the units in the header as well. So, you can provide them in whatever units you wish.
- Peg
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