Hello Researchers,
I faced a problem while using Landsat 8 OLI surface reflectance product. The images of the same scene captured on different dates show very different contrast in colour. Any particular Radiometric/Atmospheric corrections required?
Sun angle, cloud/snow cover are not there, I am sure for that. Because it is a plain topograhy and the selected images are with less than 10% scene cloud cover.
Please provide technical answers only matching with the question.
Regards.
Hello Mr roy
in summer and winter, the brightness temperature is different then when you use Flaash order, the result may change to another color (even i was evaluate Tehran greenspaces in 2013 & 2019(AUGUST) the color of them was different and that's better to use CIR mode to recognition the elements). if that isn't necessary to use reflectance that's better use radiance alternative.(all of these in ENVI software)
I add a link, I hope it help you, dl and read that:
https://www.researchgate.net/publication/233793398_Principles_of_remote_sensing_an_introductory_textbook
As the the topoography is important in your area, Try to do an othortectification first on the 1st Landsat 8 product (the DN values), using a DTM (SRTM/USGS).
On ENVI software : Map > Ortho> Ortho using Generic RPC
Once orthorectified, convert it to reflectance , i think it will be more coherent.
On ENVI : Basic Tools>Preprocessing>Calibration> Landsat calibration
Good luck
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