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Full catalog/SNPPCrISL1BNSR
SNPPCrISL1BNSR·v4·dataset

Calibrated raw infrared light spectra (Suomi-NPP CrIS)

Suomi NPP CrIS Level 1B Normal Spectral Resolution V4 (SNPPCrISL1BNSR) at GES DISC
land NASA GES_DISC Level 1B active
In plain English

What it measures. Calibrated readings of infrared light across more than 1,300 narrow color channels, along with spacecraft, instrument, and location details. These are the raw spectra at normal (not the higher full) spectral resolution.

How it's made. Captured by the CrIS infrared sounder on the Suomi-NPP satellite and calibrated; this is an early-stage product before the light is turned into temperature or gas measurements.

How & where you'd use it. A building-block input most people use through higher-level temperature, moisture, and gas products rather than directly.

What's measured

SPECTRAL/ENGINEERING › INFRARED WAVELENGTHS › BRIGHTNESS TEMPERATURESPECTRAL/ENGINEERING › INFRARED WAVELENGTHS › INFRARED RADIANCE

Coverage & cadence

  • Time span2012-01-20 → ongoing
  • Measured bySuomi-NPP (CrIS)
  • Processing levelLevel 1B
  • Spatial extent-180, -90, 180, 90
  • 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

Version 4 is the current version of this dataset and supersedes previous versions (Version 1, 2, 3). Please see Version Description for more information about these changes. The Cross-track Infrared Sounder (CrIS) Level 1B Normal Spectral Resolution (NSR) data files contain radiance measurements along with ancillary spacecraft, instrument, and geolocation data for the CrIS instrument on the Suomi National Polar-orbiting Partnership Project (SNPP) satellite. In December 2014, the spectral resolution of data transmitted to the ground from the SNPP CrIS instrument was increased by a factor of two in the midwave infrared band, and by a factor of four in the shortwave infrared band. In November 2015, additional points were included at the ends of the longwave and shortwave SNPP CrIS interferograms to improve calibration quality. Prior to November 2, 2015 at 16:06 UTC, SNPP CrIS data are only available in NSR. After that time, the SNPP CrIS data are available in both NSR and Full Spectral Resolution (FSR). JPSS-1 and JPSS-2 CrIS data are only provided in FSR. The NSR files have 1,317 channels: 163 shortwave channels from 3.9 to 4.7 microns (2555 to 2150 cm-1), 437 midwave channels from 5.7 to 8.05 microns (1752.5 to 1242.5 cm-1), and 717 longwave channels from 9.1 to 15.41 microns (1096.25 to 648.75 cm-1). Each CrIS field-of-regard (FOR) contains 9 field-of-views (FOVs) arranged in a 3X3 array. The Level 1B files contain 30 FORs in the cross-track direction and 45 in the along-track direction. Data products are constructed on six-minute boundaries. CrIS data are designed to be used with the ATMS (Advanced Technology Microwave Sounder) instrument data. These instruments together are referred to as CrIMSS (Cross-track Infrared and Microwave Sounder Suite).

Get the data

snppcrisl1bnsr_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="SNPPCrISL1BNSR",
    version="4",
    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 GES_DISC
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.