HYGEOS support forum

Posted: **Thu Mar 18, 2021 12:01 pm**

Hello everyone,

I have many problems when using polymer to process modis.

I would like to know how to do atmospheric correction for modis by polymer-v4.13.
How to deal with modis L0 data MODIS00.A2020317.0420_1.PDS? I don't know how to convert MODIS00.A2020317.0420_1.PDS into polymer input format. Can anyone help me

Thank you very much

Posted: **Mon Mar 22, 2021 4:53 pm**

Hello,
You can not use MODIS L0 files ; you need to use MODIS Level1A files, as can be found here : https://oceandata.sci.gsfc.nasa.gov/MODIS-Aqua/L1 , and convert them to Level1C. Guidance is provided in Polymer's readme file, sections, 2.3.3 and 2.4.
Kind regards,
François

Posted: **Tue Mar 23, 2021 8:54 am**

Thank you for your suggestion,
I refer to the readme and enter the code:

Code: Select all

ding@ding-virtual-nachine:~/polyner-v4.13$ l2gen ifile=/home/ding/data/nodis/0323/A2020030091000.L1A_LAC ofile=/home/ding/data/nodis/0323/A2020030091000.L1C gain="1 1 1 1 1 1 1 1" oformat="netcdf4" l2prod="rhot_nnn polcor_nnn sena senz sola solz latitude longitude

But I don’t know why I haven’t received a response

kind regards,
ding

Posted: **Tue Mar 23, 2021 10:38 am**

This is because your last quotation mark is not closed.

HYGEOS support forum

MODIS atmospheric correction.

MODIS atmospheric correction.

Re: MODIS atmospheric correction.

Re: MODIS atmospheric correction.

Re: MODIS atmospheric correction.