Search found 618 matches

by gnwiii
Tue Oct 26, 2021 6:32 am America/New_York
Forum: All Questions/Comments
Question: MODIS Aqua Chl-a Product
Replies: 5

Re: MODIS Aqua Chl-a Product

Daily products just combine the available granuals, so can't capture the details when there are rapid changes in chlorophyll level. Other products (PAR) that have daily cycles, aren't usable on time scales less than 30 days, but daily products are still generated and then used to produce monthly pro...
by gnwiii
Mon Oct 25, 2021 9:28 pm America/New_York
Forum: All Questions/Comments
Question: PAR L3 product - Unexpected patterns
Replies: 1

Re: PAR L3 product - Unexpected patterns

https://oceancolor.gsfc.nasa.gov/docs/ancillary/ describes the current sea-ice data set under "Ancillary Data/Surface Properties". I'm not sure what was used for the existing MODIS Aqua processing. The patterns you see are probably due to low resolution of the ice data. When doing an annu...
by gnwiii
Mon Oct 25, 2021 5:47 pm America/New_York
Forum: All Questions/Comments
Question: MODIS Aqua Chl-a Product
Replies: 5

Re: MODIS Aqua Chl-a Product

Firstly, the orbital period is 99 minutes means it takes 99 minutes for the Aqua satellite to move from the south pole to the north pole. Am I correct? The orbital period is time for a complete orbit, so south pole to north pole and back around to south pole. Secondly, you mentioned over 24 hours w...
by gnwiii
Mon Oct 25, 2021 8:40 am America/New_York
Forum: All Questions/Comments
Question: Old leapsec.dat file on Ancillary site
Replies: 2

Re: Old leapsec.dat file on Ancillary site

unless there's a leap second to add
or, thanks to global warming, subtract! Adding a second is simpler than subtracting, as you don't get the same time twice when adding, so it will not be surprising to see some problems with subtracting a leap second.
by gnwiii
Mon Oct 25, 2021 8:30 am America/New_York
Forum: All Questions/Comments
Question: How do I know which OCSSW branches and tags are available?
Replies: 1

Re: How do I know which OCSSW branches and tags are available?

See https://seadas.gsfc.nasa.gov/downloads/ : Run the installer: The following will get a list of the available TAGS. Tags starting with "V" are operational versions, "T" are test versions. $ ./install_ocssw --list_tags Note that the Ocean Color Web Site still has links for the o...
by gnwiii
Mon Oct 25, 2021 8:21 am America/New_York
Forum: All Questions/Comments
Question: MODIS Aqua Chl-a Product
Replies: 5

Re: MODIS Aqua Chl-a Product

The MODIS instrument is constantly scanning. Aqua's orbit goes over the poles and takes about 99 minutes: https://en.wikipedia.org/wiki/Aqua_(satellite) , so over 24 hours you get 14.5 orbits. Generally you can download 5 minutes of data as a "granual", see: https://modis-images.gsfc.nasa....
by gnwiii
Fri Oct 22, 2021 12:51 pm America/New_York
Forum: All Questions/Comments
Question: (Log file directory is not accessible to write) Install Seadas 8.1.0, WSL, Windows 10, OCSSW
Replies: 36

Re: (Log file directory is not accessible to write) Install Seadas 8.1.0, WSL, Windows 10, OCSSW

I don't see anything in your post that explains: # WARNING!!! Mission directory 'C:\home\negri\ocssw\share\olci' does not exist Normally, OLCI sensor-specific files are found in $OCDATAROOT/olci . The value of OCDATAROOT should be set in OCSSW_bash.env . Since the benchmark script works, MODIS Aqua ...
by gnwiii
Thu Oct 21, 2021 3:02 pm America/New_York
Forum: All Questions/Comments
Question: (Log file directory is not accessible to write) Install Seadas 8.1.0, WSL, Windows 10, OCSSW
Replies: 36

Re: (Log file directory is not accessible to write) Install Seadas 8.1.0, WSL, Windows 10, OCSSW

Step 7: II. ./install_ocssw --instal_dir $HOME/ocssw –tag V2021.2 --seadas --olcis3a --olcis3b --msis2a --msis2b --oli --benchmark has a small but critical typo -- "--instal_dir" should be "--install_dir" (two "ells"). I'm not sure why there is "ll." at the st...
by gnwiii
Mon Oct 18, 2021 11:43 am America/New_York
Forum: All Questions/Comments
Question: Search and download data files
Replies: 5

Re: Search and download data files

Thanks for your help. Unfortunately I have to stick with cURL now as I am retired and my colleague needs time to develop new scripts in Python - and the present scripts (in bash) are really too long. The best way to go is to fix now what is really needed in the present script (working with cURL) to...
by gnwiii
Sun Oct 17, 2021 7:46 am America/New_York
Forum: All Questions/Comments
Question: Outdated Planetary Ephemeris in OCSSW Distribution
Replies: 1

Re: Outdated Planetary Ephemeris in OCSSW Distribution

-b v7.5 has been replaced by the current version, which is now identified by "tag". There are likely more changes than just the ephemeris data. Using a "tag" means everyone can have the same commits. The "branch" always includes recent commits, so what you have may dep...