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EO data products (L0, L1, L2, L3, L4) across agencies and companies

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Definition

L0: Reconstructed unprocessed data at full space-time resolution with all available supplemental information to be used in subsequent processing (e.g. ephemeris, health and safety) appended. Reconstructed, unprocessed instrument or payload data at full resolution, with any and all communications artifacts (e.g., synchronization frames, communications headers, duplicate data) removed; 

L1A: Reconstructed unprocessed data at full resolution, time- referenced, and annotated with ancillary information, including radiometric and geometric calibration coefficients and geo-referencing parameters (e.g. ephemeris) computed and appended but not applied to the L0 data.

L1B: Radiometrically corrected and calibrated data in physical units at full instrument resolution as acquired.

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; [NASA-EOSDIS]

Level 1B: Level 1A data that have been processed to sensor units and contains acquisition time pixel location with associated uncertainties. Data processing is performed in a consistent manner for the entire data set; [FIDUCEO] 

Level 1C: Level 1B data that have been georeferenced in a standard grid specific to the instrument (e.g., geostationary projection); [FIDUCEO]

L2: Derived geophysical parameters (e.g. sea surface temperature, leaf area index) at the same resolution and location as L1 source data  

L3: Data or retrieved geophysical parameters which have been spatially and/or temporally re-sampled (i.e. derived from L1 or L2 products), usually with some completeness and consistency. Such re-sampling may include averaging and composting 
L4: model output or results from analysis of lower level data (i.e. parameters that are not directly measured by the instruments, but are derived from these measurements). 
 
Level 3: Variables mapped on uniform space-time grid scales, usually with some completeness and consistency and can include data from multiple satellites; [FIDUCEO]
Level 4: Model output or results from analyses of lower-level data. This includes interpolated data sets and/or data sets gap-filled using external data.
 

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1. Earth Observation system words

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