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Full catalog/CAL_IIR_L1_COR-Standard-V3-00
CAL_IIR_L1_COR-Standard-V3-00·vV3-00·dataset

Calibration corrections for the CALIPSO infrared imager

CALIPSO IIR Level 1 Calibration Correction data
land NASA LARC_CLOUD Level 1B HDF4
In plain English

What it measures. A set of correction numbers, not pictures, used to fine-tune the readings from CALIPSO's infrared camera so that its measurements of the energy coming off Earth are accurate.

How it's made. These semi-empirical corrections were generated for the Imaging Infrared Radiometer aboard the CALIPSO satellite, a NASA and French space agency mission, as a behind-the-scenes step in producing the calibrated imagery.

How & where you'd use it. This is a low-level technical input most people never touch directly; it exists so the finished infrared cloud and aerosol images from CALIPSO can be trusted.

What's measured

SPECTRAL/ENGINEERING › VISIBLE WAVELENGTHS › VISIBLE RADIANCE

Coverage & cadence

  • Time span2006-06-12 → 2023-06-30
  • Measured byCALIPSO (IIR)
  • Processing levelLevel 1B
  • FormatsHDF4
  • StatusCOMPLETE

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

CAL_IIR_L1_COR-Standard-V3-00 is the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Infrared ImagingRadiometer (IIR) Level 1 Calibration Correction, Version 3-00 data product. The IIR calibration data product contains semi-empirical corrections that were applied to compute the earth view calibrated radiances reported in the Level 1B product. CALIPSO was a partnership between NASA and the French Space Agency, CNES. CALIPSO was launched on April 28, 2006, to study the many roles clouds and aerosols play in Earth’s climate and weather. It flew in the international A-Train constellation for coincident Earth observations from launch until September 13, 2018, when CALIPSO began lowering its orbit from 705 km to 688 km (428 miles) above the Earth to resume formation flying with CloudSat as part of the “C-Train.” The CALIPSO satellite carried three remote sensing instruments: the Cloud-Aerosol Lidar with Orthogonal Polarization(CALIOP), the Imaging Infrared Radiometer (IIR), and the Wide Field-of-View Camera (WFC). By mutual agreement between NASA and CNES, the CALIPSO science mission concluded on August 1, 2023.

Get the data

cal_iir_l1_cor-standard-v3-00_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="CAL_IIR_L1_COR-Standard-V3-00",
    version="V3-00",
    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.