Data Levels

Data Processing Levels

NASA's Earth Observing System Data and Information System (EOSDIS) data products are processed at various levels ranging from Level 0 to Level 4. Level 0 products are raw data at full instrument resolution. At higher levels, the data are converted into more useful parameters and formats. All Earth Observing System (EOS) instruments must have Level 1 products. Most have products at Levels 2 and 3, and many have products at Level 4.

Data Level Description
Level 0 Reconstructed, unprocessed instrument and payload data at full resolution, with any and all communications artifacts (e.g., synchronization frames, communications headers, duplicate data) removed. (In most cases, NASA's EOS Data and Operations System [EDOS] provides these data to the Distributed Active Archive Centers [DAACs] as production data sets for processing by the Science Data Processing Segment [SDPS] or by one of the Science Investigator-led Processing System [SIPS] to produce higher-level products.)
Level 1A Reconstructed, unprocessed instrument data at full resolution, time-referenced, and annotated with ancillary information, including radiometric and geometric calibration coefficients and georeferencing parameters (e.g., platform ephemeris) computed and appended but not applied to Level 0 data.
Level 1B Level 1A data that have been processed to sensor units (not all instruments have Level 1B source data).
Level 2 Derived geophysical variables at the same resolution and location as Level 1 source data.
Level 3 Variables mapped on uniform space-time grid scales, usually with some completeness and consistency.
Level 4 Model output or results from analyses of lower-level data (e.g., variables derived from multiple measurements).

Last Updated: Jun 4, 2019 at 12:26 PM EDT