Introduction
The ORNL DAAC is a source for biogeochemical and ecological data useful for studying environmental processes. These data have been collected on the ground, from aircraft, or by satellite or have been generated by computer models. The extent of data ranges from site-specific to global, and durations range from days to years.

For a brief printable description of our projects and archived data holdings, see the Data Set Overview. For a hardcopy of a comprehensive list of archived data holdings, see the Complete Data Set List. Click on the project links on these pages to obtain data.

Data Citation Policy
Please read our Data Citation Policy before using ORNL DAAC data or referencing our Web site. If you cite our data in any publications, please send us a reprint of your publication. Please contact us for instructions about mailing reprints.