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Full catalog/TEMPO_RADT_L1
TEMPO_RADT_L1·vV03·dataset

Raw twilight sunlight readings over North America (TEMPO)

TEMPO geolocated Earth radiances twilight V03 (PROVISIONAL)
land NASA LARC_CLOUD Level 1B NetCDF-4
In plain English

What it measures. Raw twilight light readings over North America, capturing city lights and faint dusk illumination in ultraviolet and visible wavelengths, at roughly 10 km resolution.

How it's made. Recorded by NASA's TEMPO instrument and processed into a calibrated, geolocated low-level (Level 1) radiance product; these are provisional, early-validation data.

How & where you'd use it. A raw building-block input that scientists turn into higher-level products; the twilight readings are notable for capturing nighttime city lights.

What's measured

SPECTRAL/ENGINEERING › VISIBLE WAVELENGTHS › VISIBLE RADIANCESPECTRAL/ENGINEERING › ULTRAVIOLET WAVELENGTHS › ULTRAVIOLET RADIANCE

Coverage & cadence

  • Time span2023-09-27 → 2025-11-28
  • Measured byIS-40e (TEMPO)
  • Processing levelLevel 1B
  • FormatsNetCDF-4
  • StatusACTIVE

What you can do with it

  • Track deforestation, fire scars and land-cover change
  • Monitor crop and vegetation health (NDVI/EVI)
  • Map how built-up vs. green an area is over time
Official description

Level 1 twilight radiance files provide radiance measured during twilight hours to capture city lights at TEMPO’s native spatial resolution, ~10 km^2 at the center of the Field of Regard (FOR), for individual granules. Each granule covers the entire North-South TEMPO FOR but only a portion of the East-West FOR. The files are provided in netCDF4 format, and contain information on radiometrically calibrated and geolocated radiances for the UV and visible bands, corresponding noise, geolocation, viewing geometry, quality flags and other ancillary information. The product is produced using the L0-1b processor which includes image processing steps to produce radiometrically calibrated radiances with nominal navigation. These data reached provisional validation on December 9, 2024.

Get the data

tempo_radt_l1_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TEMPO_RADT_L1",
    version="V03",
    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 LARC_CLOUD
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.