Search found 17 matches

by hxczjh123
Fri Aug 10, 2018 4:00 am America/New_York
Forum: All Questions/Comments
Question: ask some quesitons about AOT and Angstrom Exponent
Replies: 7

ask some quesitons about AOT and Angstrom Exponent

Dear Sean,
Thank you for your reply! Could you please explain the one-time "best effort" specifically?
Thank you so much!
by hxczjh123
Mon Aug 06, 2018 9:35 pm America/New_York
Forum: All Questions/Comments
Question: some questions about L2GEN
Replies: 1

some questions about L2GEN

Hello everyone,In Seadas L2GEN,Products--Atmospheric correction Intermediates,a parameter 'w0' refers to the aerosol single scattering albedo? and what do 'w0_sma','w0_soa' refer to ,respectively? Because I want to use 'single scattering albedo' provided by various of...
by hxczjh123
Tue Jul 17, 2018 10:14 pm America/New_York
Forum: All Questions/Comments
Question: ask some quesitons about AOT and Angstrom Exponent
Replies: 7

ask some quesitons about AOT and Angstrom Exponent

Dear Sean,
Thank you so much for your help!
So, you mean the NASA GOCI L2 products(GW method with Bailey(2010)) using the same method with using l2gen----aer_opt----choose '-2- Multi-scattering with 2-band,RH-based model selection and iterative NIR correction' ?
Best Regards.
by hxczjh123
Mon Jul 16, 2018 6:47 am America/New_York
Forum: All Questions/Comments
Question: ask some quesitons about AOT and Angstrom Exponent
Replies: 7

ask some quesitons about AOT and Angstrom Exponent

Dear Sean,Thank you for your always reply!1. I haved download GOCI L2 products from this site. But I found there are some negative values for Rrs(660)?Rrs(680) even in open oceans.What's the reason?2. These GOCI L2 products generate using Gordon and Wang method or your method(Bailey,2010)? ...
by hxczjh123
Wed Jul 11, 2018 9:36 pm America/New_York
Forum: All Questions/Comments
Question: ask some quesitons about AOT and Angstrom Exponent
Replies: 7

ask some quesitons about AOT and Angstrom Exponent

Hello everyone?To my understand?when the bands increase?then the AOD decrease.And?the range for Angstrom Exponent is from 0 to 2.But recently?I have used seadas to generate GOCI L2 products using NIR iterative method?Bailey?2010??and match them up with Microtops which measure AOD. But in China yello...
by hxczjh123
Sat Jun 30, 2018 3:25 am America/New_York
Forum: All Questions/Comments
Question: white aerosol ?
Replies: 3

white aerosol ?

Dear Sean,
You means it refers to 'UV-AC' algorithm(atmospheric correction using ultraviolet wavelength) which is provided by Xianqiang He(2012) ?
by hxczjh123
Sat Jun 30, 2018 3:22 am America/New_York
Forum: All Questions/Comments
Question: atmospheric correction algorithms for level 2 products for sensors
Replies: 3

atmospheric correction algorithms for level 2 products for sensors

Dear Sean,Thank you for your help!To my understand, L2 products downloaded from oceancolor  use standard  atmospheric correction(NIR method).Is it right?I have another question:I have downloaded several days of MODIS/Aqua L1B products , and then I'd like to use l2gen to generate L2 pro...
by hxczjh123
Mon Jun 11, 2018 7:21 am America/New_York
Forum: All Questions/Comments
Question: calculate wind direction
Replies: 2

calculate wind direction

Dear Sean,

Thank you so much for your help!
by hxczjh123
Mon Jun 11, 2018 7:20 am America/New_York
Forum: All Questions/Comments
Question: atmospheric correction algorithms for level 2 products for sensors
Replies: 3

atmospheric correction algorithms for level 2 products for sensors

Hello everyone,1. I have downloaded L2 products?including Rrs?. But what's the atmospheric correction algorithms used in SeaDAS to generate L2 products for MODIS/Aqua?GOCI?VIIRS?2. Why GOCI do not have data between Aug.15,2017 to Aug.26,2017 in https://oceancolor.gsfc.nasa.gov/?    Are...
by hxczjh123
Tue Jun 05, 2018 8:09 am America/New_York
Forum: All Questions/Comments
Question: calculate wind direction
Replies: 2

calculate wind direction

Hello everyone,Recently,I have downloaded Aqua L2 products using SeaDAS l2gen.The product 'windangle' can output.I use 'zonal wind' and 'meridional wind' products from the L2 products to calculate wind direction according to the following fomula:        &#...