I'm working on a WorldView 3 image in QGIS and have been told to use Dark Object Subtraction (DOS) to atmospherically correct it to surface reflectance using the raster calculator. I have the Top of Atmosphere (TOA) reflectance and the original Digital Number (DN) image.
I have only been able to find guides and papers (e.g. Song et al 2001 Classification and Change Detection Using Landsat TM Data: When and How to Correct Atmospheric Effects? and Chavez 1988 An improved dark-object subtraction technique for atmospheric scattering correction of multispectral data) using DN values to calculate path radiance. These don't use TOA reflectance.
As I have TOA reflectance if I identify dark objects and subtract the mean TOA reflectance value of these from the image would this be a valid DOS method?