For a multi-temporal study (my master thesis) that uses satellite images to obtain indices, for example, is it right or wrong to use level 2 images? (to save time and avoid mistakes) Would it be better if I process the level 1 images? (Landsat)
Thank you
Hi Jenny Lizeth Flores Zuñiga
Level 2 Landsat Surface Reflectance science products are definitely the preferred choice among researchers as these products are already atmospherically corrected (a crucial pre-processing step before multi-temporal studies/analysis) and as you pointed out, it helps save time so that researchers can spend more time interpreting the results rather than spend time on data processing. Of course, if you have the time or for learning purposes, it is recommended to manually pre-process Level 1 to Level 2 using various algorithms such as DOS, FLAASH, etc. And if you still have more time, you can compare the USGS Level 2 products and the manually corrected data with the In-situ ground measurements (if available) for validation.
- https://www.usgs.gov/landsat-missions/landsat-collection-2-level-2-science-products
I suggest you use "T1_SR";
var L4_SR = ee.ImageCollection('LANDSAT/LT04/C01/T1_SR')
var L5_SR = ee.ImageCollection('LANDSAT/LT05/C01/T1_SR')
var L7_SR = ee.ImageCollection('LANDSAT/LE07/C01/T1_SR')
var L8_SR = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR')
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