I'm currently involved in a vicarious calibration and characterization exercise for which I need satellite values of EXACT normalized water leaving radiance (eqn. 4.20, Ocean Optics Protocols, Rev. 4, Vol. III) with units of uW cm-1 nm-1 sr-1. I just want to verify that I've understood what each of the processing levels are in terms of the parameters they calculate. So, are the following statements true?
1. Level 1B radiances are calibrated, top of atmosphere radiances corrected for atmosphere with units of W m-2 um-1 sr-1.
2. Level 2 normalized water leaving radiances with units of mW cm-2 um-1 sr-1 are calculated from eqn. 4.20 (ref. as above) and are EXACT normalized water leaving radiances.
If I've got that right, then I think what I want is L2 nLw? If I've misunderstood, I'd be most grateful for some help!
Thanks.
By ewa
Date 2008-01-05 00:10
Susanne,
1. Level 1B are calibrated and geolocated top-of-the-atmosphere (TOA) radiances. As they are TOA, the are NOT corrected for the atmosphere.
2. If you are using operational normalized water leaving radiances, they are corrected for the bidirectionality of the subsurface light field, thus they are 'exact'.
You have the units correct.
Ewa.
Topic Products and Algorithms / Satellite Data Products & Algorithms / Exact normalized water leaving radiance (554 hits)
