Radiometric calibration of Sentinel-2 products
How can I calibrate
Sentinel-2products, to extract the
I've downloaded few
Sentinel-2products from https://scihub.copernicus.eu/s2/#/home, and opened them with
SNAPbut its radiometric calibration is dedicated only to
Radiometric calibrationtool is seemingly only capable of extracting the
radiance. What is the difference between the
reflectance? Is the estimation of the
radiancecounted as a radiometric calibration of a product?
Sentinel-2 Level 1C data are expressed in reflectance with a scaling factor, not in radiance. You have to divide by 10000 to get the reflectance. In the preliminary products shown this autumn, you had to divide by 1000.
The scaling factor is given in the xml file at the root of the product directory.
There is no offset and the no_data value is 0.