The value is nan for chlor_a from MODIS

[megasaputra8]

Dear all,
I have run l2gen for MODIS data. I want to extract chlor_a. But the result value is nan. Why ?
While for other date MODIS data, the data is not nan.

The MODIS data is in : https://1drv.ms/u/s!AjXAWS5maHffhyu6DmUAGwxoJaJq?e=eUzkBf
I put the result of chlor in that link.

Thank you.

[OB SeaDAS - dshea]

Looks like this is a night time file.  All pixels PRODFAIL and HISOLZEN.  L2gen flagged it as :day_night_flag = "Night"

can't get chl at night.

don

[gnwiii]

l2gen output includes a summary of flags:

[...]
Flag #13:         HISOLZEN    5524320  86.4407
[...]
Flag #31:         PRODFAIL    6390880 100.0000

The HISOLZEN flag indicates the sun is close to the horizon, so
you should not expect useful results.

You can also see the percentages in the NetCDF metadata:
$ ncdump -h chla
[...]
group: flag_percentages {

    // group attributes:
                :ATMFAIL = 0.f ;
                :LAND = 26.62129f ;
                :PRODWARN = 0.f ;
                :HIGLINT = 0.f ;
                :HILT = 0.f ;
                :HISATZEN = 5.927666f ;
                :COASTZ = 4.799761f ;
                :SPARE = 0.f ;
                :STRAYLIGHT = 0.f ;
                :CLDICE = 0.f ;
                :COCCOLITH = 0.f ;
                :TURBIDW = 0.f ;
                :HISOLZEN = 86.44067f ;
                :LOWLW = 0.f ;
                :CHLFAIL = 0.f ;
                :NAVWARN = 13.34746f ;
                :ABSAER = 0.f ;
                :MAXAERITER = 0.f ;
                :MODGLINT = 0.6738195f ;
                :CHLWARN = 0.f ;
                :ATMWARN = 0.f ;
                :SEAICE = 0.f ;
                :NAVFAIL = 13.55932f ;
                :FILTER = 0.f ;
                :BOWTIEDEL = 0.f ;
                :HIPOL = 0.f ;
                :PRODFAIL = 100.f ;
    } // group flag_percentages


[megasaputra8]

oh I see.
I did't see the time of acquisition.
Thank you for your information