NOAA CDR GRIDSAT-B1: Geostationary IR Channel Brightness Temperature

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brightness cdr infrared noaa reflectance sr


This dataset provides a high quality Climate Data Record (CDR) of global infrared measurements from geostationary satellites.

The geostationary satellite data (GridSat-B1) provides data from 3 channels: the CDR-quality infrared window (IRWIN) channel (near 11µm), the visible channel (near 0.6µm) and the infrared water vapor (IRWVP) channel (near 6.7µm). The GridSat-B1 data is projected onto a global 0.07 degree latitude equal-angle grid with date coverage spanning from 1980-present. This data is sourced from the 3-hourly International Satellite Cloud Climatology Project (ISCCP) B1 data. The satellites included in this dataset with their longitudinal coverage over time can be seen here. In regions of overlap the CDR methodology merges satellites by selecting the nadir-most observations for each grid point.


  • Mappings from satid to satellite name are contained in the image's properties as satid_number: "satellite_name", e.g. satid_0: GOES-13, satid_1: GOES-15, and satid_2: GOES-16.

  • IRWIN data has been corrected for view zenith angle, but this correction is not perfect. It also treats all satellites the same way, whereas the view zenith angle dependence will vary by satellite. Some VZA residual will be apparent.

  • IRWVP data has no view zenith angle correction and is not CDR quality.

  • VSCHN data has no view zenith angle corrections and is not CDR quality.

  • Removing the View Zenigth Angle correction for the IRWIN channels can be done with the following: Original_temperature_observed = irwin_cdr - irwin_vza_adj


7792 meters


Name Units Min Max Scale Offset Description
irwin_cdr K -2093* 13615* 0.01 200

Brightness temperature near 11µm, nadir-most observation

irwin_2 K -4123* 13579* 0.01 200

Brightness temperature near 11µm, second-best observation (based on view zenith angle)

irwin_3 K -1624* 14240* 0.01 200

Brightness temperature, third-best observation based on view zenith angle

irwvp K -5907* 10219* 0.01 200

Brightness temperature near 6.7µm, nadir-most observation

irwvp_2 K -5081* 10260* 0.01 200

Brightness temperature near 6.7µm, second-best observation based on view zenith angle

vschn -25000* 4275* 4e-05 1

Visible reflectance near 0.6µm, nadir-most observation

vschn_2 -25000* 3800* 4e-05 1

Visible reflectance near 0.6µm, second-best observation based on view zenith angle

irwin_vza_adj K 36* 171* 0.25 -10

Adjustment made to all IRWIN channels. Provided to allow users to reverse the view zenith correction for the irwin_cdr variable.

satid_ir1 0* 5*

satid values for irwin_cdr. For this and other satid bands, the mappings of satid to satellite name are given in the properties for each image

satid_ir2 0* 5*

satid values per pixel for irwin_2

satid_ir3 0* 5*

satid values per pixel for irwin_3

satid_wv1 0* 5*

satid values per pixel for irwvp

satid_wv2 0* 5*

satid values per pixel for irwvp2

satid_vs1 0* 5*

satid values per pixel for vischn

satid_vs2 0* 5*

satid values per pixel for vischn2

* estimated min or max value

Image Properties

Image Properties

Name Type Description
satid_0 STRING

Satellite name (see notes)

satid_1 STRING

Satellite name (see notes)

satid_2 STRING

Satellite name (see notes)

satid_3 STRING

Satellite name (see notes)

satid_4 STRING

Satellite name (see notes)

satid_5 STRING

Satellite name (see notes)

Terms of Use

Terms of Use

The NOAA CDR Program's official distribution point for CDRs is NOAA's National Climatic Data Center which provides sustained, open access and active data management of the CDR packages and related information in keeping with the United States' open data policies and practices as described in the President's Memorandum on "Open Data Policy" and pursuant to the Executive Order of May 9, 2013, "Making Open and Machine Readable the New Default for Government Information". In line with these policies, the CDR data sets are nonproprietary, publicly available, and no restrictions are placed upon their use. For more information, see the Fair Use of NOAA's CDR Data Sets, Algorithms and Documentation pdf.


  • Kenneth R. Knapp, and NOAA CDR Program (2014): NOAA Climate Data Record (CDR) of Gridded Satellite Data from ISCCP B1 (GridSat-B1) 11 micron Brightness Temperature, Version 2. [indicate subset used]. NOAA National Climatic Data Center. doi:10.7289/V59P2ZKR [access date].

  • Knapp, K. R., S. Ansari, C. L. Bain, M. A. Bourassa, M. J. Dickinson, C. Funk, C. N. Helms, C. C. Hennon, C. D. Holmes, G. J. Huffman, J. P. Kossin, H.-T. Lee, A. Loew, and G. Magnusdottir, 2011: Globally gridded satellite (GridSat) observations for climate studies. Bulletin of the American Meteorological Society, 92, 893-907. doi:10.1175/2011BAMS3039.1


Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.ImageCollection('NOAA/CDR/GRIDSAT-B1/V2')
                  .filter('2017-05-01', '2017-05-14'));
var brightnessTemp =['irwin_cdr', 'vschn', 'irwvp']);
var brightnessTempVis = {
  min: 500.0,
  max: 10000.0,
Map.setCenter(7.71, 17.93, 2);
Map.addLayer(brightnessTemp, brightnessTempVis, 'Brightness Temperature');
Open in Code Editor