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Last Post 28 Dec 2008 06:29 AM by anon

problem in MODIS.sli

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anon

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28 Dec 2008 06:29 AM
Merry Christmas. A problem in MODIS.sli of ENVI 4.3 and 4.5. I want to get the Center wavelength of MODIS 36 bands, and I used modis.sli file to calculate. there exists little error in modis.sli. the value of band1 and band2 is reversed in envi 4.3. seems also made mistakes in band 27 and band28 . in literatures about MODIS, band 27 wavelength is between 6.535 - 6.895 micrometer, while band 28 wavelength is between 7.175 and 7.475 micrometer. http://modis.gsfc.nasa.go...t/specifications.php but I calculate from the modis.sli value the 27,28 band equivalent of the central wavelength is about 7.4194936 and 7.3353619 micrometer respectively,the former is lengther than latter. what's wrong with me? I used the envi 4.3 and 4.5 two visions. Thank you for your reply in advance.

MariM

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29 Dec 2008 08:19 AM
The issues with bands 1 and 2 were a known issue and corrected in ENVI 4.4. They should be correct in 4.5. Looking at bands 27 and 28, there does appear to be a problem with the Band 27 pass since it is not covering the correct range as reported on the MODIS website. Band 28 did look like it covers the correct range. I will inform development of this. If you have the band pass function file from MODIS, you can create a new file to correct this. I have been unable to find these on the web so far.

Deleted User

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29 Dec 2008 06:44 PM
Thank you for your relpy. I will be waiting for your notification. Thanks

Deleted User

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08 Jan 2009 06:34 PM
Hello mminari, I have found the band Relative Spectral Response of MODIS from ftp://ftp.mcst.ssai.biz/pub/permanent/MCST/ and I calculate the center wavelength of band 27 is 6.77 micron with excel 2003. thank you for your attention.

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