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I am working on a project comparing each pixel every 4 years for the same AOI from Landsat Images (1986-2017). It involves with Landsat 5, 7 and 8 images. Do I need to perform image registration as image preparation? I am using only RGB and NIR bands all data has the same spatial resolution (30 m). I am using higher level data (level 2). Can somebody explain why it is necessary or not?

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Using Collection 1 is not necessary:

In 2016, the USGS reorganized the Landsat archive into a tiered collection. This structure ensures that Landsat Level-1 products provide a consistent archive of known data quality to support time-series analyses and data “stacking”, while controlling continuous improvement of the archive and access to all data as they are acquired.

So use Collection 1 Level-2 scenes:

enter image description here

  • Why would you use Level-2 instead of Level-1? Aren't they scenes with larger uncertainties, or did I misinterpret that? Also, @OguzSariyildiz you need to accept the answer if it answers your question. – Jon May 15 '18 at 20:25
  • @Jon I agree, but is part of the question -I am using higher level data (level 2)- – aldo_tapia May 15 '18 at 20:30
  • @Jon 2 Level-2 images are corrected atmospherically (or surface reflectance). It helps with accuracy of the values in temporal vegetation analysis (NDVI). Thank you for your comments and info! – Amadeus May 15 '18 at 23:17
  • @OguzSariyildiz for NDVI times series, I would prefer to use a radiometric normalization using invariant pixels over NDVI TOA values – aldo_tapia May 16 '18 at 1:54
  • @aldo_tapia Why do you think radiometric normalization using invariant pixels better than NDVI TOA values? – Amadeus May 16 '18 at 3:34

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