OMI/Aura TOMS-Like Total Column Ozone L3 (OMTO3e)

OMI/Aura TOMS-Like Total Column Ozone L3, also distributed as OMTO3e, is an open NASA Earthdata product for daily global total ozone mapping from the Aura Ozone Monitoring Instrument ^[1]. It provides a Level-3 gridded product on 0.25 degree grids, making it more directly usable for spatial analysis and map-based workflows than orbit-level retrieval files ^[1]. The product includes total column ozone, radiative cloud fraction, and solar and viewing zenith angles, which helps users screen geometry and cloud effects when comparing ozone fields across days or regions ^[1]. NASA distributes the dataset through GES DISC as an open Earthdata catalogue product for ozone-layer monitoring and global ozone analysis ^[1].