Nikolaos T
New Member
Posts:3  
| 13 May 2019 06:54 AM |
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Hello,
I have performed radiometric and atmospheric correction of ASTER_L1T thermal bands. Firstly, I have performed the radiometric correction and after that the atmospheric. Lastly, I did the emissivity normalization. More specifically, I have insert the images into ENVI 5.3 new UI, and then I performed the corrections (when I performed the radiometric correction I did NOT apply FLAASH). As a result I had 1 image instead of 5 (as my original thermal bands). My question is why I get only 1 image as a result and not 5?
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MariM
Veteran Member
Posts:2396 
| 13 May 2019 07:32 AM |
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If you input 5 thermal bands from ASTER into the Emissivity Normalization tool, you should get 5 emissivity images and one temperature image returned. I just processed the 5 thermal bands of a 1A ASTER image and those are the products that are returned. Are you expecting more than one temperature image?
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Nikolaos T
New Member
Posts:3
| 13 May 2019 07:35 AM |
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I think so. 1 temperature image for every band. Why should I get only 1 temperature image? This is what I can not understand.
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Nikolaos T
New Member
Posts:3
| 13 May 2019 07:46 AM |
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Ok, thanks for the answer. I think I got it. The temperature of the overlapping pixels of the 5 bands will be the same, but the emissivity would be different. Right?
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MariM
Veteran Member
Posts:2396
| 13 May 2019 07:58 AM |
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Temperature is calculated from all input bands and then used to calculate emissivity for each band. The emissivity is different for each band in my ASTER data. You can check by creating a spectral profile of the emissivity bands.
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