Solar radiation enters the Earth's atmosphere with a portion being scattered by clouds and aerosols.

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Processing, archiving and distributing Earth science data
at the NASA Langley Research Center

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MISR Level 3 Albedo and Cloud Versioning


MISR Level 3 Albedo and Cloud Versioning

Component Global Albedo Product (CGAL) and Component Global Cloud Product (CGCL) - Daily, Monthly, Quarterly, Yearly products

ESDT Product File Name Prefix Current Quality Designations
  • Stage 2: CLOUD - Wind Vectors, Height Histogram
  • Stage 1: ALBEDO - Expansive, Restrictive and Local Albedo (except over snow and ice)
  • Provisional: ALBEDO - over snow and ice


Note: Level 3 is a summary of Level 2. This page covers changes to the Level 3 software itself for each product version, but you should also consult the TOA/Cloud Albedo Versioning statement for changes to the Level 2 data being summarized.


Ver. # Production
Start Date
Software Configuration/
Product Impact
Quality Transition
F06_0024 (albedo)
F02_0024 (cloud)
12/01/2007 The entire mission is being reprocessed at this level.

Data Product Specification Rev Q (PDF).

No user visible changes, other than updates to the underlying Level 2 data that is being summarized (see TOA/Cloud Albedo and TOA/Cloud versioning pages for details).

F06_0022 (albedo)
F02_0022 (cloud)
08/01/2007 Data Product Specification Rev P (PDF).

Now have a time dimension in all fields for netCDF files (even though there is only one time value). This was a change requested by data product users to integrate better with existing tools such as vcdat that expect a time dimension.

F06_0020 (albedo)
F02_0020 (cloud)
10/02/2006 Data Product Specification Rev O (PDF).

Added netCDF version. These products are the same format as the HDF-EOS products except there is one file for each grid resolution. Example file name:

F06_0016 (albedo)
F02_0016 (cloud)
02/15/2006 Data Product Specification Rev N (PDF).

No user visible changes, other than changes in Level 2 data being summarized (see TOA/Cloud Versioning statement).

F06_0014 (albedo)
F02_0014 (cloud)
12/01/2005 Data Product Specification Rev N (PDF).

Initial baseline for Level 3 Component Global Cloud Product (CGCL) public release.

Baseline ancillary files:

  • MISR_AM1_AGP_Pxxx_F01_24.hdf

For Albedo (CGAL) product, this version fixes an error in the "Time of Observation" data, which in the previous version was missing many Level 2 observations. The actual Level 3 averages contained all of these observations, they simply were not being recorded in the "Time of Observation" vdata. The current version does correctly record all the Level 2 observations.

  • Stage 2CLOUD - Height Histogram
  • Stage 1CLOUD - Wind Vectors
  • Stage 1ALBEDO - Expansive and Restrictive Albedos
F06_0012 (albedo) 05/13/2005 Data Product Specification Rev M (PDF).

Initial baseline for Level 3 Component Global Albedo Product (CGAL) public release.

Baseline ancillary files:

  • MISR_AM1_AGP_Pxxx_F01_24.hdf
  • Beta all parameters