I am trying to do atmospheric correction on AWiFS data onboard IRS-P6 using FLAASH module of ENVI 5.1.
I have some doubts in the parameters that need to be inputted into the module. In the multispectral settings tab, there is an option for water reference channel, what does it mean? Also an option for index to first band is there, If the value is set from 1 to 4, then it displays the following error message.
'filterfunctionfile'.sli doenot contain enough bands for the given input image. please check sensor type. The sensor type was, however, set to unknown.
And if index is set to 0, then it says that 'filterfunctionfile'.sli doenot contain any non-zero responses for band : 0
However, at this step some processing starts and then it stops after a while with the following error message:
ACC error: modrd5: Non finite numbers in coefficiebt array coeff.
OPENR: Error opening file, Unit: 100, File , Filterfunctionfile.sli.hdr
The system cannot find the file specified
What is exactly the problem, Am I using wrong parameters or else inputting files in wrong format or what?
What is the path to the filter function you are using? Is it empty? There is no filter function for AWiFS data in ENVI so you would need to supply your own filter function for this.
Alternately, you could use Quac.
Of course, I am inputting the filter function file that has been created using spectral library builder tool available in the software.
Does the input image and filter function use the same units (microns or nm)?
How do I check the wavelength units of the input image?
Right click on the image in the Layer Manager and select View Metadata and then view the spectral information. It should show the units as microns or nanometers. Does this also match the filter function units?
Oh, the meta data of input image does not contain this information. What now?
You will need to add this information using Edit Header (for ENVI 5.1) or Edit Metadata for ENVI 5.3 and higher. You can also do this using ENVI Classic, File->Edit ENVI Header.
This did not help!
Can you post the template.txt that is created in the output directory and what is the error message shown at the bottom of the journal.txt?
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