Child pages
  • CDAAC Data Users FAQ

Versions Compared


  • This line was added.
  • This line was removed.
  • Formatting was changed.

Table of Contents


Question: How do I know which mission to use for the date-range I need? 

Answer: If you have a CDAAC Data username and password, go to:

and check which mission has the data range you need. 

i.e: Mission 'cosmic2013' has data for date-range: 2006.112 - 2014.120

Please note: Some days during this date-range might not be available due to data outages. 

Question: How do I use the Data Download Interface

Answer:  If you have a CDAAC Data username and password, go to:

And choose your mission, after that, select the data type you need and the date. 

Then either select a 'list of files', or 'get a tarball'. 

Instructions on how to get data via wget commands are at the bottom of that page. 

Question: How do I know what the file name means for a given data type?

Answer: Go to:

And find and click on the data type you are interested in.

(Example ionPrf will link to this page: )

Question: If I can get data from COSMIC, can I also get data from other missions?

Answer: Yes, once you can get data from mission COSMIC, you will also be able to retrieve data from the other missions. 

Question: Where do I sign up to get data?

Answer: Go to:

And either click on 'COSMIC Sign Up' or 'Other Missions Sign Up'

The 'COSMIC Sign Up' link will route you to a Website in Taiwan, once you submit the form, the approval process takes around 5 business days. 

The 'Other Missions Sign Up' link will direct you to a form, the process is faster; you will not be able to get COSMIC data with this form only, if you want COSMIC data please click on the 'COSMIC Sign Up' link.

Question: Do you have any information wrt BUFR and NetCDF File readers: 

BURF File Reader:
Perl Reader for our BUFR files, packaged for easy installation: RObufr-0.02.tar.gz

NetCDF Readers:
Users are welcome to go to: and install the netCDF library on their machine. In addition to this library, there are netcdf interfaces available for many programming languages and products, some of which are listed at:

Question: Can I get the data via LDM?

Answer:  We now have the capability to distribute our data via LDM -- Local Data Manager -- an event-driven data distribution system. Web Link:
Please contact the COSMIC Systems Administration Team at: if you are interested in receiving our data sets via LDM.

We are currently providing 'ionPrf', 'atmPrf', 'wetPrf' and 'bfrPrf' files via LDM. If resources become available and sufficient interest is noted for additional files we will expand the list. Please contact the COSMIC Systems Administration Team at: to let us know what file types you would like.

Question: I am seeing negative refractivity or other bad values in some atmPrf profiles with COSMIC2013 and new COSMIC profiles, what is going on?

Answer:  Starting with the COSMIC2013 reprocessing we do not exclude profiles that failed the QC from our archives.  You must check the netcdf global attribute  :bad and exclude any atmPrf files where bad = 1 for general research.     

Question: How do I use the wget commands for one day ?

Answer:  Here is an example of how you would use it. Please change the mission name, file type and date (YYYY.DDD) to your needs. 

wget -q --http-user=xxxx --http-passwd=xxxxxx -O cosmic_scnLv1_2013.156.tar

Question: How do I get longer periods of data using the wget commands?

Answer:   For getting data for a long period of time, please use the wget command along with a for loop:

or i in $(seq 151 152); do wget -q --http-user=xxxx --http-passwd=xxxxxxxx$i -O cosmic_scnLv1_2013.$i.tar; done