EMIT L3 Aggregated Mineral Spectral Abundance and Uncertainty

EMIT L3 Aggregated Mineral Spectral Abundance and Uncertainty (EMITL3ASA V002) is a static global-scale mineralogy product derived from EMIT L2B per-pixel mineral identifications. Produced by NASA JPL and LP DAAC, it aggregates L2B results to a 0.5-degree grid (approximately 55 km at the equator) and reports fractional spectral abundance for each of 30 mineral classes across the EMIT ISS observation window from 10 August 2022 to 20 January 2024.^[1][2]

This is a static derived product, not a continuously updated operational stream. V002 is the current and final version as of 2025-08-27; no further updates have been announced.^[2] V001 (22 SDS layers, temporal coverage through 2023-07-30) is superseded by V002.^[3]

Spectral abundance is an optical, reflectance-derived fractional measure. It is not equivalent to mass fraction; conversion requires grain-size data not included in the product.^[4][5] V002 contains a minor grain-size transcription error in the uncertainty model that causes deviations typically well below 1%, with calcite reaching approximately 2% in select pixels; iron oxides are virtually unaffected. Deviations fall within the stated uncertainty bounds.^[1]

Geographic coverage is constrained to approximately 52 S to 52 N latitude by ISS inclination. A bare soil mask excludes non-mineral surfaces during aggregation; vegetated and persistently clouded areas may have sparse 0.5-degree cells. NetCDF-4 format requires CF-convention-aware readers. NASA Earthdata account registration is required for download.^[2][5]