Data Policy

Public Data

All NDACC data more than one year old are public data. Additionally some PIs have authorized their data for early release. These data are available as soon as they are cataloged in the database.This public record is available through anonymous ftp at or through a search tools available on the NDACC website.

Proprietary Data

All NDACC data newer than one year from acquisition and not authorized for early release are proprietary data and available only through direct accounts on the NDACC database. Parties interested in general access to this data should prepare a proposal to the NDACC Steering Committee for consideration as NDACC collaborators. For more information contact the NDACC Lidar Working Group co-Chairs. Otherwise, the use of any individual NDACC data set prior to its being made publicly available (i.e., for use associated with field campaigns, satellite validation, etc.) is possible via collaborative arrangement with the appropriate PI(s).

Data Use Agreement:

If the metadata of an NDACC data file contain an explicit Data License and/or explicit DATA_RULES_OF_USE, then the indicated Rules of Use prevail over the following General Rules of Use.  In the absence of a Data License or explicit DATA_RULES_OF_USE associated with the datafile, the following General Rules of Use apply:
All NDACC data users at a minimum must acknowledge both the NDACC Data Handling Center and the NDACC PI in any publication, as follows:
“The data used in this publication were obtained from “NDACC PI name” as part of the Network for the Detection of Atmospheric Composition Change (NDACC) and are available through  the NDACC website”

When it is envisaged to use NDACC data in a publication or communication, the respective NDACC PI(s) or IWG co-chairs must be contacted during the preparation of the publication or communication to discuss possible collaboration with the NDACC PI and co-authorship.

In all cases, NDACC data users are expected to consult the online documentation and reference articles to fully understand the scope and limitations of the NDACC datasets available at the NDACC DHF.  They are strongly encouraged to contact the respective NDACC PI (listed in the data documentation on the web page) to receive any additional information regarding the data product that could be useful in their studies/applications and as such ensure the proper use of specific data sets.

General NDACC Data Access Links:


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