Data Documents

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 station search.

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 Steering Committee 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).

Rapid delivery data

For some projects it is of value to offer data to the scientific community with a maximum delay of one month. If these rapid delivery data are of less quality of traditional NDACC certified data, if the data have not yet been quality controlled, or if the data is less complete (e.g. missing uncertainty estimates) then these data must be identified as 'Rapid Delivery (RD)'. These are available separately on the NDACC public website at As soon as the standard verified version is available, the RD data will be removed and the fully verified version will be archived in the NDACC archive.