Search found 26 matches

by lwk1542
Mon Nov 22, 2021 10:48 pm America/New_York
Forum: Questions/Comments
Question: How to generate L3M product from L1B data source?
Replies: 3

Re: How to generate L3M product from L1B data source?

OB SeaDAS - xuanyang02 wrote: > l2bin creates a Level 3 bin file (L3b) from one or more Level 2 input > files, and l3mapgen creates a Level 3 mapped image (L3m) from a Level 3 bin > file. > > See > https://seadas.gsfc.nasa.gov/help-8.1.0/processors/ProcessL2bin.html > https://seadas.gsfc.nasa.gov/he...
by lwk1542
Sat Nov 20, 2021 10:26 pm America/New_York
Forum: Questions/Comments
Question: How to generate L3M product from L1B data source?
Replies: 3

How to generate L3M product from L1B data source?

I downloaded MYD021KM and MYD03 data at a fixed location for one year. Then, I used the l2gen tool to obtain Rrs and chlor_a products. Now, I want to obtain annual average products with a resolution of 1 km,no related guidelines, however, to help me finish this (https://seadas.gsfc.nasa.gov/tutorial...
by lwk1542
Wed Nov 10, 2021 11:00 pm America/New_York
Forum: Questions/Comments
Question: HICO
Replies: 7

Re: HICO

Hi Sean,
The website provides RSR of many sensors. However, the RSR of seawifs is different with others.
specifically, the max value of seawifs is over 1 (even 25) and others are lower than 1. How to convert RSR of seawifs?
by lwk1542
Tue Nov 09, 2021 8:09 pm America/New_York
Forum: Questions/Comments
Question: how to generate the look-up-table of rayleigh and aerosol?
Replies: 0

how to generate the look-up-table of rayleigh and aerosol?

In the past few months, I read the seadas OCSSW l2gen code and figure out it. Thanks for this open-source work. Now, I try to figure out the generating of LUT of Rayleigh and aerosol model, but there are few references about tool or code. Please, Are there any more guidelines than the ocean optics w...
by lwk1542
Sun May 16, 2021 2:27 am America/New_York
Forum: Questions/Comments
Question: the confuse about phase function of aerosol model
Replies: 4

Re: the confuse about phase function of aerosol model

THANKS for your help!
by lwk1542
Thu May 13, 2021 10:57 pm America/New_York
Forum: Questions/Comments
Question: the confuse about phase function of aerosol model
Replies: 4

Re: the confuse about phase function of aerosol model

THANKS for your help! I was really anxious before your replying.
But, the big interpolated values exist in some LUTs(for example:aerosol_modist_r30f00v01.hdf, please see attachment). why?
by lwk1542
Thu May 06, 2021 10:00 am America/New_York
Forum: Questions/Comments
Question: the confuse about phase function of aerosol model
Replies: 4

the confuse about phase function of aerosol model

In aerosol.c of l2gen, the model_phase() can return phase. the one part of the code is as follows. I can't find the definition of splint() in all code, so I guess it returns a volume scattering function (phase) of aerosol look-up table according to scatter angle and wavelength. I am very confuse abo...
by lwk1542
Sat Apr 03, 2021 9:50 am America/New_York
Forum: Questions/Comments
Question: rayleigh radiance computing problem
Replies: 1

rayleigh radiance computing problem

Dr. : I computing rayleigh radiance using a code that is similar to "rayrad.pro" (https://oceancolor.gsfc.nasa.gov/cgi/idllibrary.cgi?dir=atmocorr). However, the result is different with seadas product "Lr". the scatter in the following attachment file shows difference at eight b...
by lwk1542
Wed Mar 17, 2021 12:22 pm America/New_York
Forum: Questions/Comments
Question: how to estimate AOT for sunglint radiance calculation?
Replies: 1

how to estimate AOT for sunglint radiance calculation?

According to the code in the “atmocor2.c” and “glint.c” files,the sunglint needs to be computed before aerosol estimating. However, the aerosol optical depth is an input variable for sunglint. In the page (https://oceancolor.gsfc.nasa.gov/docs/ocssw/dir_6ccb91f4c2064ceb88562b4f384b06f5.html), I did ...
by lwk1542
Tue Mar 16, 2021 10:04 pm America/New_York
Forum: Questions/Comments
Question: the link of "HOWTO_Add_a_sensor.txt" file is error
Replies: 3

Re: the link of "HOWTO_Add_a_sensor.txt" file is error

OB.DAAC - SeanBailey wrote: > On which page did you find this link? > > By the way, that file is part of the OCSSW source code distributed as an > optional part of SeaDAS: > https://seadas.gsfc.nasa.gov/downloads/ > (although not as an individually downloadable file) > > Sean this page: https://ocea...