Search found 10 matches

by imaginaryfish
Fri Sep 30, 2022 12:56 pm America/New_York
Forum: Questions/Comments
Question: Question about OceanColor solar irradiance (F0) and nLw units
Replies: 5

Re: Question about OceanColor solar irradiance (F0) and nLw units

Forgive the naive question, but which values of F0 should be used to convert between RRS and nLw? There are values given in the metadata in the Aqua MODIS L2 netcdf files and then there is the F0 listed on in these tables (https://oceancolor.gsfc.nasa.gov/docs/rsr/rsr_tables/). And they are not the ...
by imaginaryfish
Thu Sep 29, 2022 9:48 am America/New_York
Forum: Questions/Comments
Question: Question about OceanColor solar irradiance (F0) and nLw units
Replies: 5

Re: Question about OceanColor solar irradiance (F0) and nLw units

Thank you Sean! Good to know I am learning and my knowledge is somewhat accurate.
by imaginaryfish
Wed Sep 28, 2022 11:52 am America/New_York
Forum: Questions/Comments
Question: Question about OceanColor solar irradiance (F0) and nLw units
Replies: 5

Question about OceanColor solar irradiance (F0) and nLw units

Hello, I am new to processing ocean color data and I am working on converting RRS to nLw. However, I think either I am not understanding something or there is an error on the OceanColor website where F0 is listed (https://oceancolor.gsfc.nasa.gov/docs/rsr/rsr_tables/). For each sensor/platform the u...
by imaginaryfish
Wed Sep 21, 2022 6:23 pm America/New_York
Forum: Questions/Comments
Question: wget download of order manifest not working
Replies: 5

Re: wget download of order manifest not working

Thank you for the suggestion Sean. I am working on a pipeline to automate the download and processing a large chunk of data, so this is a test run on a small subset. I did get this download to work. I did need the "-i" option in wget. The problem was I was supplying wget the url from the m...
by imaginaryfish
Tue Sep 20, 2022 3:58 pm America/New_York
Forum: Questions/Comments
Question: wget download of order manifest not working
Replies: 5

Re: wget download of order manifest not working

Sorry, correction, the data order is valid until 9/23/2022
by imaginaryfish
Tue Sep 20, 2022 3:57 pm America/New_York
Forum: Questions/Comments
Question: wget download of order manifest not working
Replies: 5

Re: wget download of order manifest not working

Thank you for the instructions. I regenerated the .netrc and .urs_cookies files in my home directory. I am able to download other files from the direct data access with no problem; however, when I try to download the manifest with the following command: wget --load-cookies ~/.urs_cookies --save-cook...
by imaginaryfish
Fri Sep 16, 2022 6:17 pm America/New_York
Forum: Questions/Comments
Question: wget download of order manifest not working
Replies: 5

wget download of order manifest not working

Hello, I ordered a small data request to test download a processing pipeline but the download using wget is not returning what is expected. My code: wget' --load-cookies cookie_path --save-cookies cookie_path --keep-session-cookies --auth-no-challenge=on --no-check-certificate --content-disposition ...
by imaginaryfish
Mon Jul 25, 2022 3:33 pm America/New_York
Forum: Questions/Comments
Question: MODIS Aqua reprocessing status 2022
Replies: 4

MODIS Aqua reprocessing status 2022

Hello, I am relatively new to remote sensing and I was told that the MODIS Aqua ocean color dataset is in the middle of reprocessing. Is there an update on how much has been completed and when it is expected to be done? Also, I am curious about the major changes between this reprocessing and the 201...
by imaginaryfish
Tue Apr 05, 2022 11:54 am America/New_York
Forum: Questions/Comments
Question: Donwload earthdata with R script
Replies: 2

Re: Donwload earthdata with R script

Hi vharvey, The following code will download the file you are interested in. library(ncdf4) url <- 'http://oceandata.sci.gsfc.nasa.gov [/opendap/MODISA/L3SMI/2017/241/A2017241.L3m_DAY_CHL_chl_ocx_4km.nc]' modis <- nc_open(url) chl_ocx <- ncvar_get(modis, 'chl_ocx') lonm <- ncvar_get(modis, 'lon') la...
by imaginaryfish
Fri Jun 04, 2021 4:14 pm America/New_York
Forum: Questions/Comments
Question: What is the definition of the HISATZEN MODIS flag?
Replies: 2

What is the definition of the HISATZEN MODIS flag?

The HISATZEN is the "Sensor view zenith angle exceeds threshold" sure, but what angle is the threshold set at? How can I define my own angle? The Level 2 MODIS data does not contain the sensor angle that I can find. The only angle is the Center Solar Zenith Angle, which is not helpful.