Earthdata Forum

Hello everyone,

I try to generate Secchi depth (Zsd_Lee) from Landsat 8 using l2gen. Unfortunately, I received the following error: "Zeu_lee: a 490nm channel is required for this algorithm". I mention that I did not include Zeu_lee on the products list in the *.par file. I tried l2gen on both Seadas GUI and in the command line, the result is the same.

Did some have this issue before or have any idea of how to fix it?

Thank you very much!
Ioan
Bellow, I inserted the content of *.par file :

# SUITE
suite=OC

# PRODUCTS
l2prod=Rrs Rrs_nnn Zsd_lee Zsd_morel Kd_vvv_lee a_vvv_qaa a_865_qaa b_vvv_qaa b_865_qaa

# PROCESSING OPTIONS
absaer_opt=2
aer_opt=-10
maskcloud=0
maskhilt=0

# ANCILLARY INPUTS  Default = climatology (select 'Get Ancillary' to download ancillary files)

# IOP OPTIONS
giop_adg_opt=2
iop_opt=3

# ANCILLARY INPUTS  Default = climatology (select 'Get Ancillary' to download ancillary files)

The Zsd product is a special case of the Zeu product and has the same input wavelength requirements.
Sean

Dear Sean,

Thank you for your answer!
This partially solves my issue. I have not a problem to compute also the Zeu product as long as I get the Zsd.
Do you have any idea on how to solve the "a 490nm channel is required for this algorithm" error?

Thank you!

Ioan

The Lee algorithms requires a 490nm band.  Landasat 8's OLI sensor has a 482nm band.  Close, but not close enough for the code to accept it.
So, without modifying the code and recompiling, you cannot produce any of the Lee photic depth products (Zeu, Zsd, Zp) for OLI.

Sean

Dear Sean,

I clearly undestood, thank a lot for your help!
Best,

Ionut.