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My objective is to perform a land cover classification with multiple scenes over historical imagery (one year every decade).

Most of the imagery I have downloaded is level-2 imagery. From my understanding level-2 imagery is already atmospherically corrected. But since I am using multiple scenes, does that mean I still have to manually perform corrections even though it is a level-2 product? If so, what are all the types of correction that I need? Atmospheric, solar, geometric?

Edit: When I mosaic the images I get a huge visual difference, even though the images are only taken days apart and I have mosaicked them so their stretch hand display settings should be the same.

Here is a screenshot of the problem

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You do not need to do any further atmospheric correction with Landsat OLI/TIRS Level-2 data products as they are already corrected to surface reflectance. These data will be sufficient for time-series analysis as well as work involving multiple scenes. However, make sure any older imagery (i.e. earlier than Landsat 8 OLI/TIRS) is also corrected to surface reflectance if you plan on using that for your time-series analysis.

Here are more details from USGS EROS:

The U.S. Geological Survey (USGS) offers on-demand production of Landsat 8 Operational Land Imager/Thermal Infrared Sensor (OLI/TIRS) Surface Reflectance data through EarthExplorer. Surface Reflectance products provide an estimate of the surface spectral reflectance as it would be measured at ground level in the absence of atmospheric scattering or absorption. The Surface Reflectance products are generated at the Earth Resources Observation and Science (EROS) Center at a 30-meter spatial resolution. The EROS Science Processing Architecture (ESPA) on-demand interface corrects satellite images for atmospheric effects to create Level-2 data products.

  • Thanks for the answer! When I mosaic the images I get a huge visual difference, even though the images are only taken days apart and I have mosaicked them so their stretch hand display settings should be the same. I originally thought would be fixed by correction (hence the question). How would I fix this issue? – Kevin Yang Jul 10 at 17:49
  • It looks like your original question morphed into two parts. I would recommend opening a new question so that you can get the answer you need. It looks like you need to color balance the imagery. – Aaron Jul 11 at 0:54

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