Search found 32 matches

by OB General Science - guoqingw
Fri Oct 21, 2022 9:37 am America/New_York
Forum: Questions/Comments
Question: absorption data due to gelbstoff and detritus at 443nm
Replies: 5

Re: absorption data due to gelbstoff and detritus at 443nm

Hi, We do noticed the issue and is looking for the reason. While waiting for the color bar to show up, you can also download the l3map files and open it in SeaDAS (https://seadas.gsfc.nasa.gov/) to manipulate the images - zoom in to your interested region, see the variation over time, and do further...
by OB General Science - guoqingw
Mon Oct 10, 2022 11:22 am America/New_York
Forum: Questions/Comments
Question: NASA Datasets for the OBSEA CTD calibration and ecological analysis.
Replies: 1

Re: NASA Datasets for the OBSEA CTD calibration and ecological analysis.

Hi Marco, You can use L1/l2 browser (https://oceancolor.gsfc.nasa.gov/cgi/browse.pl) to order and download the data for your study area at a particular period of time. Here is the help page on how to use the l1/l2 browser: https://oceancolor.gsfc.nasa.gov/browse_help/top_level/ Let us know if you st...
by OB General Science - guoqingw
Thu Sep 22, 2022 9:51 am America/New_York
Forum: Questions/Comments
Question: wget download of order manifest not working
Replies: 5

Re: wget download of order manifest not working

I think the problem could be from the bulk downloading you are trying to do. When using wget to download more than one file, you can put all the urls (e.g. https://oceandata.sci.gsfc.nasa.gov/ob/getfile/T2017004001500.L1A_LAC.bz2) into a txt file (such as required_files.txt), then use the following ...
by OB General Science - guoqingw
Tue Sep 20, 2022 2:32 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

You may need to configure your username and password for authentication using a .netrc file following the instructions on the following page:
https://oceancolor.gsfc.nasa.gov/data/download_methods/#netrc
by OB General Science - guoqingw
Thu Sep 08, 2022 11:19 am America/New_York
Forum: Questions/Comments
Question: MODISL2 hdf to tiff and reprojection
Replies: 6

Re: MODISL2 hdf to tiff and reprojection

Hi,

Do you mind providing more information about the MODIS L2 data that you are using? Where did you download the file? What is the original MODIS L2 filename?

Thank you,
Guoqing
by OB General Science - guoqingw
Mon Aug 22, 2022 3:39 pm America/New_York
Forum: Questions/Comments
Question: how to read data from meteorological data in ocean color auxilary file using python
Replies: 1

Re: how to read data from meteorological data in ocean color auxilary file using python

Are you referring to the meteorological climatology data (met_climatology_v2014.hdf from https://oceancolor.gsfc.nasa.gov/docs/ancillary/)? For this file, yes, there are 12 months' data. For all the months from Feb - Dec., the different parameters' name should include "_Month", such as &qu...
by OB General Science - guoqingw
Fri Aug 12, 2022 12:37 pm America/New_York
Forum: Questions/Comments
Question: How can I know the resolution of this dataset
Replies: 2

Re: How can I know the resolution of this dataset

The spatial resolution for L2 JPSS-1/NOAA 20 is 750 m. On this webpage (https://www.nesdis.noaa.gov/current-satellite-missions/currently-flying/joint-polar-satellite-system/jpss-mission-and), it says JPSS covers the entire globe twice a day. You can always find the spatial resolution and much more i...
by OB General Science - guoqingw
Mon Aug 08, 2022 3:04 pm America/New_York
Forum: Questions/Comments
Question: Sentinel-2 with l2gen
Replies: 17

Re: Sentinel-2 with l2gen

Hi, The error happens because Sentinel 2A MSI lacks a band around 412nm, which means QAA (https://www.ioccg.org/groups/software.html) is not applicable to MSI. It requires 5 bands in total (412,443,490,555, and 670 nm) but MSI only has 4 of them. My suggestion is changing the iop_opt=3 to iop_opt=7 ...
by OB General Science - guoqingw
Mon Aug 08, 2022 1:15 pm America/New_York
Forum: Questions/Comments
Question: Extract chlorophyll -a
Replies: 2

Re: Extract chlorophyll -a

Adding on to Bing's answer, you can following the tutorial on this page for Pixel Extraction using SeaDAS:
https://seadas.gsfc.nasa.gov/help-8.2.0/pixelExtraction/PixelExtraction.html

Guoqing