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Data Level Definitions

(from Earth Sciences Reference Handbook)

Level-0 Reconstructured unprocessed instrument/payload data at full resolution; raw engineering measurements
Level-1 Reconstructured unprocessed instrument data at full resolution, time-referenced, and annotated with ancillary information, computed and appended, but not applied, to the Level 0: processed tracking data
Level-2 Derived geophysical variables at the same resolution and location as the Level 1 source data.
Level-3 Variables mapped on uniform space-time grid scales, usually with some completeness and consistency. It is at this data level we will concentrate: examples include position time series, observation equations and normal equations from a single technology.
Level-4 Model output or results from analyses of lower level data (i.e., variables derived from multiple measurements)