Jose Manuel Lattus
New Member
Posts:39  
| 18 May 2020 12:46 PM |
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Hello! I read some issues about this and I find 2 answers in the forum, so to calculare Emissivity in ASTER L1T Images
1. Apply Radioetric Calibration for Radiance TIR Images --> Execute Thermak Atmospheric Correction --> Calculate Emissivity
2. 1. Apply Radioetric Calibration for Radiance TIR Images --> Calculate Emissivity
wich will be better?
Jose Manuel
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MariM
Veteran Member
Posts:2396 
| 19 May 2020 05:28 AM |
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If you are planning on using the image(s) in change detection, comparing images from different dates or sensors, it is always best to perform an atmospheric correction to the data so that they are as close as possible to true reflectance/emissivity/temperature, etc.
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Jose Manuel Lattus
New Member
Posts:39
| 19 May 2020 10:28 AM |
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Thanks, I use It for spectral Emissivity mapping!
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Jose Manuel Lattus
New Member
Posts:39
| 19 May 2020 01:33 PM |
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So, both are correct!? If I use emissivity spectra to detect material I thing is better to Use de 1. (with atmospheric correction)
thanks
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MariM
Veteran Member
Posts:2396
| 20 May 2020 05:23 AM |
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I would say it is necessary for making image comparisons from different times/dates. It isn't always necessary for a single image process - for example to classify a single image.
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