I have downloaded one EO-1 Hyperion image, removed the bad bands, de-stripped the image using THOR De-striping in ENVI and applied the atmospheric correction using FLAASH in ENVI. Now I have the surface reflectance data in my hand. I need to apply some bio-optical algorithm for ocean colour application (IOP and Bathymetry Retrieval). For that I need the Remote Sensing Reflectance as an input. How can I get Remote Sensing Reflectance (Rrs) from Surface Reflectance? What are the procedures?