Search found 9 matches

by comet0607
Thu May 19, 2022 3:58 am America/New_York
Forum: Questions/Comments
Question: Where can I find the spectral response functions of SeaWiFs
Replies: 1

Where can I find the spectral response functions of SeaWiFs

Hi,The color matching function is involved in my research, which requires the spectral response function of SeaWiFs. May I ask where I can find it?

Thank u very much!
Comet
by comet0607
Thu Dec 23, 2021 2:47 am America/New_York
Forum: Questions/Comments
Question: Why does hicO's Lt(top of atmosphere) data exceed 1?
Replies: 9

Re: Why does hicO's Lt(top of atmosphere) data exceed 1?

I still don't quite understand how this data should be used. After I opened it with Matlab, the value of Lt*0.02 was very small. I want to know how to use HICO's L1b Lt (atmospheric top radiance data). What is the problem that caused the low value of data? Because I see that the program about true c...
by comet0607
Thu Nov 25, 2021 8:54 pm America/New_York
Forum: Questions/Comments
Question: Why does hicO's Lt(top of atmosphere) data exceed 1?
Replies: 9

Re: Why does hicO's Lt(top of atmosphere) data exceed 1?

I am not sure if my reply has been sent, because it is not shown on my side. Here is my reply (Wed Nov 24, 2021 9:32pm America/New_York) : Does HICO's L1b data include (Lt *0.02) as radiance? Are there any other steps needed to process the data? I chose a scene with cloud HICO data (H2010304222425.l...
by comet0607
Wed Nov 24, 2021 9:32 pm America/New_York
Forum: Questions/Comments
Question: Why does hicO's Lt(top of atmosphere) data exceed 1?
Replies: 9

Re: Why does hicO's Lt(top of atmosphere) data exceed 1?

Does HICO's L1b data include (Lt *0.02) as radiance? Are there any other steps needed to process the data?
I chose a scene with cloud HICO data (H2010304222425.l1b_iss.nc), and the maximum value of Lt is only 26.2140. Is it my method of data processing wrong?

Thanks again for your kind help!
Comet
by comet0607
Tue Nov 23, 2021 2:01 am America/New_York
Forum: Questions/Comments
Question: Why does hicO's Lt(top of atmosphere) data exceed 1?
Replies: 9

Re: Why does hicO's Lt(top of atmosphere) data exceed 1?

Hi Alicia, Many thanks for your answer ! I have checked your reply and realized that Lt in HICO's L1b data is not reflectance data but radiance data. I choose one scene with cloud image,the maximum Lt (Top of Atmosphere radiance) of it was 26.2140.Since I need to use HICO and MODIS data in my resear...
by comet0607
Mon Nov 22, 2021 3:53 am America/New_York
Forum: Questions/Comments
Question: Why does hicO's Lt(top of atmosphere) data exceed 1?
Replies: 9

Why does hicO's Lt(top of atmosphere) data exceed 1?

Hello!Recently, I am using HICo to do research on true color image synthesis, which requires 70 channel data between HICO 380-780. The L1 data of HICO is downloaded and Lt (top of atmosphere) data is used. I found that many reflectance data were greater than 1, and even reached 7.96. May I ask what ...
by comet0607
Thu Oct 07, 2021 1:52 am America/New_York
Forum: Questions/Comments
Question: HICO
Replies: 7

Re: HICO

Hi Sean,

I would like to ask again what is the band width of Hico? The use of spectral response functions involves λ1 and λ2 in different band ranges. I checked the website and only said "sampled at 5.7nm". Is 5.7nm the band width or the central wavelength interval?

Thanks,
Comet
by comet0607
Tue Sep 28, 2021 10:04 pm America/New_York
Forum: Questions/Comments
Question: HICO
Replies: 7

Re: HICO

Hi Sean, Many thanks for your detailed answer ! I wonder what is the difference between the 'Relative Spectral Response'(RSR) and 'Spectral response function'(SRF) ?I looked at the MODIS spectral response function,Each band corresponds to a filter response.But I checked HICO's RSR, its size is 9000*...
by comet0607
Tue Sep 28, 2021 4:30 am America/New_York
Forum: Questions/Comments
Question: HICO
Replies: 7

HICO

I wonder where can I find the spectral response function(SRF) of HICO? I've been trying all afternoon but I can't find it.