I'm aware that in order to perform any vegetation index like NDVI, SAVI or OSAVI you need to do some atmospheric, radiometric and terrain corrections. I'm pretty sure that Level 2 images from EarthExplorer are already atmospheric and radiometric corrected but I'm not sure about the terrain or the topography... If so, do I just oreder them, download them and perform the raster calculation? I'm using QGIS 3.16.1 btw.
Thanks everyone for your answers!