| 29 Oct 2015 12:18 AM |
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I have applied USGS Defined method for Gap filling for Landsat ETM+ data. After i have to apply T-cap... but when i check its spectral properties in ERDAS, it shows slight different values in Radiance Gain and Offset (a addition and subtraction of 0.4 from gain and offset for each of bands 1:, & 7)... My question is... should I use these new values or use the default values for T-cap generation? What is the reason for the change in the values?<br />
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MariM
Veteran Member
Posts:2396  
| 29 Oct 2015 07:46 AM |
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I don't know why the gains and offsets changed after gap filling but I would suggest you apply calibration to your files before performing gap filling
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Deleted User
New Member
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| 31 Oct 2015 08:19 AM |
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<p>I was not expected that change in values... but if i do apply before, doesn't it effect its calculation due missing data/gaps in Landsat?</p>
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MariM
Veteran Member
Posts:2396
| 02 Nov 2015 06:29 AM |
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No, calibration is applied on a pixel-by-pixel basis. So those gaps will remain 0s.
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Deleted User
New Member
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| 25 Jan 2016 08:40 PM |
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In this case, it is probably consider as an error.
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