Total ozone overhead, fast delivery (Aura, daily, 0.25 degree)
What it measures. A daily global map of total overhead ozone, the cloudy fraction of each grid square, and sun and satellite viewing angles. This is the fast-turnaround version, delivered quickly after the satellite passes.
How it's made. Produced from NASA's OMI instrument on the Aura satellite, picking the best measurements from a day's orbits and laying them on a global grid, but processed for speed rather than final accuracy.
How & where you'd use it. Good for near-real-time ozone monitoring and UV forecasts, where having the data fast matters more than waiting for the fully polished version.
What's measured
Coverage & cadence
- Time span2004-07-15 → ongoing
- Measured byAura (OMI)
- Processing levelLevel Not provided
- StatusNOT PROVIDED
What you can do with it
- Map air pollutants — NO₂, aerosols, ozone
- Track greenhouse gases and Earth's energy budget
- Feed weather and air-quality analysis
Official description
The OMI science team produces this Level-3 Aura/OMI Global TOMS-Like Total Column Ozone gridded product OMTO3e (0.25deg Lat/Lon grids). The OMTO3e product selects the best pixel (shortest path length) data from the good quality filtered level-2 total column ozone data (OMTO3) that fall in the 0.25 x 0.25 degree global grids. Each file contains total column ozone, radiative cloud fraction and solar and viewing zenith angles. OMTO3e files are stored in EOS Hierarchical Data Format (HDF-EOS5). Each file contains daily data from approximately 15 orbits. The maximum file size for the OMTO3e data product is about 2.8 Mbytes. (The shortname for this Level-3 TOMS-Like Total Column Ozone gridded product is OMTO3e) .
Get the data
import earthaccess
earthaccess.login(strategy="netrc") # free Earthdata Login
results = earthaccess.search_data(
short_name="OMTO3e",
version="003",
bounding_box=(-122.5, 37.2, -121.8, 37.9), # your area (W,S,E,N)
temporal=("2024-01-01", "2024-12-31"), # your dates
)
files = earthaccess.open(results) # stream straight from OMINRTBrowsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.