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CALIPSO - Data User’s Guide - Data Quality Statements


CALIPSO HOMECALIPSO User’s Guide HOME → Data Quality Statements

Overall Summary Statement

RELEASE V4.20: View Summary HERE.



RELEASE 4 (V4.10): The fourth release of the CALIPSO data products includes new versions of its standard Level 1 and Level 2 lidar data. The V4.10 CALIOP Level 2 data products are the first major revision to the Level 2 product suite since May 2010. The extensive improvements made in this new release correct numerous artifacts and significantly enhance the content and quality of the science data.

The data processing algorithms and code used to generate the updated V4.10 CALIOP Level 1 data product are unchanged from V4.00. The only differences between the two versions are the essential ancillary data sets. The GTOPO30 Digital Elevation Model (DEM) used in V4.00 has been replaced by a substantially more accurate DEM developed by the CloudSat project. Likewise, the Global Modeling and Assimilation Office (GMAO) Forward Processing for Instrument Team (FP-IT) meteorological forecast product has been replaced with the higher quality Modern Era Retrospective-Analysis for Research (MERRA-2) reanalysis product. Use of the MERRA-2 data has been shown to yield more accurate and reliable CALIOP calibration coefficients.

The version 3.x (3.01, 3.02 and 3.30) CALIOP Level 1 and Level 2 data products will continue to be generated and made publically available, with version 4.10 running in parallel. Unlike version 3.x, which is released continuously following 2-3 day latency from downlink, new releases of the version 4.10 Level 1 and Level 2 product will have a latency of several weeks. This change in latency is a direct response to now using the MERRA-2 meteorological data. Generation and distribution of the standard version 3.x will continue until release of an updated version of the IIR Level 2 product, at which point the standard will no longer be supported. Expedited and quick-look datasets, which continue to rely on the GMAO FP-IT, will remain at version 3.x.



RELEASE V3.40: View Summary HERE.



RELEASE 3 (V3.01, V3.02 and V3.30): The third release of the CALIPSO data products features a comprehensive restructuring and expansion of the Lidar Level 2 cloud and aerosol profile products; significant enhancements to the Lidar Level 2 cloud and aerosol profile products; and the implementation of an improved calibration technique for the Lidar Level 1 532 nm daytime calibration.

The primary contents of the CALIOP Level 1 product are calibrated profiles of 532 nm perpendicular attenuated backscatter and total attenuated backscatter at 532 nm and 1064 nm. The version 3 CALIOP Level 1 data are released with a product maturity classification of Validated Stage 1, indicating that initial validation of the CALIOP attenuated backscatter products has been successful.

The CALIOP Level 2 products consist of the full resolution vertical feature mask, cloud and aerosol layer products reported at several different spatial resolutions, and cloud and aerosol profile products reported at a uniform 5-km horizontal resolution. Validation of the Level 2 products is an on-going process, and some products are better characterized than others. Preliminary validation has been accomplished for the layer detection, cloud-aerosol discrimination, and layer sub-typing algorithms. Data products derived solely from these algorithms are designated as Validated Stage 1. Validation of the optical properties algorithms that generate extinction profiles and layer optical depth estimates is a considerably more challenging task. As a consequence, while all studies to date indicate acceptable performance, the status of those data products derived from this second class of algorithms remains Provisional. All obvious artifacts have been identified and corrected in these data, but only limited comparisons with independent data sets are currently available.

The science algorithms used to produce the V3.30 CALIOP data products are identical to those used to generate the V3.01 and V3.02 products; however, some of the ancillary data used in the V3.30 analyses is different. All CALIOP data products rely on meteorological data provided by NASA’s Global Modeling and Assimilation Office (GMAO). The V3.01 and V3.02 data products were produced using the GMAO’s GEOS 5.2 data products. These products have now been phased out of production. Beginning with V3.30, the CALIOP data products are generated using the new GEOS-5 FP-IT data stream of near-real-time assimilation products that are produced primarily for NASA satellite instrument teams. The snow and ice data set used in the V3.01 and V3.02 products has also been discontinued. The V3.30 CALIOP data products now use a new snow and ice data provided by the Air Force Weather Authority.

Summary statements for older versions may be found here.

Here are listed brief data quality summaries for the data products from each instrument. Detailed data quality summaries can be found by following the appropriate links on this page. The data products are grouped into the following categories:

Uncertainties for specific parameters are reported in the individual quality statements. Quality designators indicate the maturity of products and individual parameters, and include "Beta", "Provisional", "Validated Stage 1", "Validated Stage 2", and "Validated Stage 3". A data product may contain science data sets (SDSs) at varying quality levels.


Lidar Data - Version 4.x

Level
Data Set Name
Summary
DETAILED Data Product Quality Statement
Data Production Strategy
Level 1 CAL_LID_L1-Standard-V4-10 V4.10 Summary V4.10 Detailed Quality Statement Standard
Level 2 CAL_LID_L2_05kmALay-Standard-V4-20
CAL_LID_L2_05kmALay-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_05kmCLay-Standard-V4-20
CAL_LID_L2_05kmCLay-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_05kmMLay-Standard-V4-20
CAL_LID_L2_05kmMLay-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_01kmCLay-Standard-V4-20
CAL_LID_L2_01kmCLay-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_333mMLay-Standard-V4-20
CAL_LID_L2_333mMLay-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_05kmAPro-Standard-V4-20
CAL_LID_L2_05kmAPro-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_05kmCPro-Standard-V4-20
CAL_LID_L2_05kmCPro-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_VFM-Standard-V4-20
CAL_LID_L2_VFM-Standard-V4-10
V4.20 Summary
V4.10 Summary
V4.20 Detailed Quality Statement
V4.10 Detailed Quality Statement
Standard
CAL_LID_L2_BlowingSnow_Antarctica-Standard-V1-00 Summary V1.00 Detailed Quality Statement Standard
Level 3 CAL_LID_L3_Ice_Cloud-Standard-V1-00 Summary Detailed Quality Statement Standard
CAL_LID_L3_Stratospheric_APro-Standard-V1-00 Summary Detailed Quality Statement Standard

Lidar Data - Version 3.x

Level
Data Set Name
Summary
DETAILED Data Product Quality Statement
Data Maturity Level
Level 1B CAL_LID_L1-ValStage1-V3-40 Summary Level 1B profile data Validated Stage 1
Level 2 CAL_LID_L2_05kmALay-Prov-V3-40 Summary Detailed Quality Statement Provisional
CAL_LID_L2_05kmCLay-Prov-V3-40 Summary Detailed Quality Statement Provisional
CAL_LID_L2_01kmCLay-ValStage1-V3-40 Summary Detailed Quality Statement Validated Stage 1
CAL_LID_L2_333mCLay-ValStage1-V3-40 Summary Detailed Quality Statement Validated Stage 1
CAL_LID_L2_05kmAPro-Prov-V3-40 Summary Detailed Quality Statement Provisional
CAL_LID_L2_05kmCPro-Prov-V3-40 Summary Detailed Quality Statement Provisional
CAL_LID_L2_VFM-ValStage1-V3-40 Summary Detailed Quality Statement Validated Stage 1
CAL_LID_L2_PSCMask-Prov-V1-10 Summary Detailed Quality Statement Provisional
Level 3 CAL_LID_L3_APro_AllSky-Standard-V3-00 &
CAL_LID_L3_APro_AllSky-Standard-V3-10
Summary #1
Summary #2
Detailed Quality Statement Standard
CAL_LID_L3_APro_CloudFree-Standard-V3-00 &
CAL_LID_L3_APro_CloudFree-Standard-V3-10
Summary #1
Summary #2
Detailed Quality Statement Standard
CAL_LID_L3_APro_CloudySkyTransparent-Standard-V3-00 &
CAL_LID_L3_APro_CloudySkyTransparent-Standard-V3-10
Summary #1
Summary #2
Detailed Quality Statement Standard
CAL_LID_L3_APro_CloudySkyOpaque-Standard-V3-00 &
CAL_LID_L3_APro_CloudySkyOpaque-Standard-V3-10
Summary #1
Summary #2
Detailed Quality Statement Standard


IIR Data - Version 2.00

Level
Data Set Name
Summary
DETAILED Data Product Quality Statement
Data Production Strategy
Level 1 CAL_IIR_L1-Standard-V2-00 Summary Detailed Quality Statement Standard


IIR Data - Version 1.x

Level
Data Set Name
Summary
DETAILED Data Product Quality Statement
Data Maturity Level
Level 1 CAL_IIR_L1-Prov-V1-12 Summary Detailed Quality Statement Provisional
Level 2 CAL_IIR_L2_Track-Beta-V3-45
CAL_IIR_L2_Track-Beta-V3-40
V3.45 Summary
V3-40 Summary
Detailed Quality Statement Beta
CAL_IIR_L2_Swath-Beta-V3-45
CAL_IIR_L2_Swath-Beta-V3-40
V3.45 Summary
V3-40 Summary
Detailed Quality Statement Beta


Wide Field Camera (WFC) Data

Level
Data Set Name
Summary
DETAILED Data Product Quality Statement
Data Maturity Level
Level 1 CAL_WFC_L1_125m-ValStage1-V3-02 Summary DETAILED Quality Statement Validated Stage 1
CAL_WFC_L1_1Km-ValStage1-V3-02 Summary DETAILED Quality Statement Validated Stage 1
CAL_WFC_L1_IIR-ValStage1-V3-02 Summary DETAILED Quality Statement Validated Stage 1



Maturity Level Definitions
Beta: Early release products for users to gain familiarity with data formats and parameters. Users are strongly cautioned against
the indiscriminate use of these data products as the basis for research findings, journal publications, and/or presentations.
Provisional: Limited comparisons with independent sources have been made and obvious artifacts fixed.
Validated Stage 1: Uncertainties are estimated from independent measurements at selected locations and times.
Validated Stage 2: Uncertainties are estimated from more widely distributed independent measurements.
Validated Stage 3: Uncertainties are estimated from independent measurements representing global conditions.

CALIPSO Products:

The tables below provide quality summary information for all of the CALIPSO data products. Each table contains links to both (a) an Overall Quality Summary, which provides a file-level quality assessment for each data product; and (b) a much longer Detailed Quality Statement that describes each scientific data set (SDS) found within the product file, and provides quality assessments and usage guidance at the SDS level. Please be aware that earlier generations of the data products may be of different (presumably lower) quality than current products. It is important, therefore, to note that dates on quality statements correspond to the dates when the CALIPSO data products were released, not to the dates when the raw measurements were acquired by the CALIPSO instrument.

 

Product Specific Quality Statements

Lidar Level 1B Profiles
Half orbit (Night and Day) geolocated, calibrated Lidar Profiles and Viewing Geometry Products
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
November 8, 2016 4.10 June 13, 2006 to present 4.10 Summary QS 4.10 Standard
April 2014 4.00 June 13, 2006 to May 31, 2015 4.00 Summary QS 4.00 Standard
December 14, 2016 3.40 December 1, 2016 to present 3.40 QS 3.30 Validated Stage 1
April 2013 3.30 March 1, 2013 to November 30, 2016 3.30 Summary QS 3.30 Validated Stage 1
December 2011 3.02 November 1, 2011 to February 28, 2013 3.02 Summary QS 3.02 Validated Stage 1
November 2009 3.01 June 13, 2006 to February 16, 2009
March 17, 2009 to October 31, 2011
3.01 Summary QS 3.01 Validated Stage 1
June 2009 3.00 June 13, 2006 to December 31, 2006
March 12, 2009 to June 10, 2009
No longer orderable
3.00 Summary QS 3.00 Validated Stage 1
October 2008 2.02 September 14, 2008 to February 16, 2009 2.02 Summary QS 2.01, 2.02 Provisional
December 2007 2.01 June 13, 2006 to September 13, 2008 2.01 Summary Provisional
August 12, 2007 1.22 August 12, 2007 to November 11, 2007 1.22 Summary QS 1.22, 1.20, 1.11, 1.10 Provisional
March 1, 2007 1.20 March 1, 2007 to August 11, 2007 1.20 Summary Provisional
January 6, 2007 1.11 January 6, 2007 to February 28, 2007 1.11 Summary Provisional
December 8, 2006 1.10 June 6, 2006 to January 5, 2007 1.10 Summary Provisional


Lidar Level 2 Cloud and Aerosol Layer Information
Half orbit (Night and Day) lidar cloud and aerosol layer products describe both column and layer properties
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
October 10, 2018 4.20 June 13, 2006 to present 4.20 Summary QS 4.20 Standard
November 8, 2016 4.10 June 13, 2006 to May 31, 2018 4.10 Summary QS 4.10 Standard
December 14, 2016 3.40 December 1, 2016 to present 3.40 QS 3.30 •1/3 km: Validated Stage 1
•1 km: Validated Stage 1
•5 km: Provisional
April 2013 3.30 March 1, 2013 to November 30, 2016 3.30 QS 3.30 •1/3 km: Validated Stage 1
•1 km: Validated Stage 1
•5 km: Provisional
December 2011 3.02 November 1, 2011 to February 28, 2013 3.02 QS 3.02 •1/3 km: Validated Stage 1
•1 km: Validated Stage 1
•5 km: Provisional
May 2010 3.01 June 13, 2006 to February 16, 2009
March 17, 2009 to October 31, 2011
3.01 QS 3.01 •1/3 km: Validated Stage 1
•1 km: Validated Stage 1
•5 km: Provisional
October 2008 2.02 September 14, 2008 to October 29, 2009 2.02 Summary QS 2.01, 2.02 Provisional
January 2008 2.01 June 13, 2006 to September 13, 2008 2.01 Summary Provisional
December 8, 2006 1.10 June 13, 2006 to November 11, 2007 1.10 Summary QS 1.10 •Layer Heights - Provisional
•Layer Classifications - Beta


Lidar Level 2 Aerosol Profile
Half orbit (Night and Day) averaged aerosol profile data and ancillary data
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
October 10, 2018 4.20 June 13, 2006 to present 4.20 Summary QS 4.20 Standard
November 8, 2016 4.10 June 13, 2006 to May 31, 2018 4.10 Summary QS 4.10 Standard
December 14, 2016 3.40 December 1, 2016 to present 3.40 QS 3.30 Provisional
April 2013 3.30 March 1, 2013 to November 30, 2016 3.30 QS 3.30 Provisional
December 2011 3.02 November 1, 2011 to February 28, 2013 3.02 QS 3.02 Provisional
May 2010 3.01 June 13, 2006 to February 16, 2009
March 17, 2009 to October 31, 2011
3.01 QS 3.01 Provisional
October 2008 2.02 September 14, 2008 to October 29, 2009 2.02 Summary QS 2.01, 2.02 Beta
January 2008 2.01 June 13, 2006 to September 13, 2008 2.01 Summary Beta


Lidar Level 2 Cloud Profile
Half orbit (Night and Day) averaged cloud profile data and ancillary data
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
October 10, 2018 4.20 June 13, 2006 to present 4.20 Summary QS 4.20 Standard
November 8, 2016 4.10 June 13, 2006 to May 31, 2018 4.10 Summary QS 4.10 Standard
December 14, 2016 3.40 December 1, 2016 to present 3.40 QS 3.30 Provisional
April 2013 3.30 March 1, 2013 to November 30, 2016 3.30 QS 3.30 Provisional
December 2011 3.02 November 1, 2011 to February 28, 2013 3.02 QS 3.02 Provisional
May 2010 3.01 June 13, 2006 to February 16, 2009
March 17, 2009 to October 31, 2011
3.01 QS 3.01 Provisional
October 2008 2.02 September 14, 2008 to October 29, 2009 2.02 Summary QS 2.01, 2.02 Beta
January 2008 2.01 June 13, 2006 to September 13, 2008 2.01 Summary Beta


Lidar Level 2 Vertical Feature Mask
Half orbit (Night and Day) scene classification data and lidar lighting and land/water indicators
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
October 10, 2018 4.20 June 13, 2006 to present 4.20 Summary QS 4.20 Standard
November 8, 2016 4.10 June 13, 2006 to May 31, 2018 4.10 Summary QS 4.10 Standard
December 14, 2016 3.40 December 1, 2016 to present 3.40 QS 3.30 Validated Stage 1
April 2013 3.30 March 1, 2013 to November 30, 2016 3.30 QS 3.30 Validated Stage 1
December 2011 3.02 November 1, 2011 to February 28, 2013 3.02 QS 3.02 Validated Stage 1
May 2010 3.01 June 13, 2006 to February 16, 2009
March 17, 2009 to October 31, 2011
3.01 QS 3.01 Validated Stage 1
October 2008 2.02 September 14, 2008 to October 29, 2009 2.02 Summary QS 2.01, 2.02 Provisional
January 2008 2.01 June 13, 2006 to September 13, 2008 2.01 Summary Provisional
December 8, 2006 1.10 June 13, 2006 to November 11, 2007 1.10 Summary QS 1.10 •Layer Heights - Provisional
•Layer Classifications - Beta


Lidar Level 2 Polar Stratospheric Clouds Mask
Polar stratospheric clouds presents, composition, and optical properties. Night time data only.
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
December 14, 2016 1.10 December 1, 2016 to present 1.10 QS 1.00 Provisional
October 2013 1.00 June 13, 2006 to November 30, 2016 1.00 QS 1.00 Provisional


Lidar Level 3 Aerosol Profile Monthly
Globally gridded and monthly averaged aerosol profile data and ancillary data
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
December 14, 2016 3.10 December 2016 to December 2016 3.10 QS 3.10 Standard
October 2015 3.00 June 2006 to November 2016 3.00 Summary QS 3.00 Standard
April 2013 1.30 March 2013 to September 2015 1.30 Summary QS 1.30 Beta
December 2011 1.00 June 2006 to February 2013 1.00 Summary QS 1.00 Beta


Lidar Level 3 Ice Cloud Monthly
Globally gridded and monthly averaged cloud data
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Production Strategy
May 2018 1.00 June 13, 2006 to December 31, 2016 1.00 Summary QS 1.00 Standard


Lidar Level 3 Stratospheric Aerosol Profile Monthly
Globally gridded & monthly averaged stratospheric aerosol profile data
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Production Strategy
August 2018 1.00 June 13, 2006 to December 31, 2016 1.00 Summary QS 1.00 Standard


IIR Level 1B Radiances
Half orbit (Night and Day) geolocated, calibrated radiances
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
July 12, 2017 2.00 June 13, 2006 to present 2.00 Summary QS V2.00 Standard
December 2011 1.12 November 1, 2011 to present 1.12 Summary   Provisional
November 6, 2008 1.11 August 20, 2008 to October 31, 2011 1.11 Summary   Provisional
December 8, 2006 1.10 June 13, 2006 to August 19, 2008 1.10 Summary   Provisional


IIR Level 2 Track Data
Half orbit (Night and Day) emissivity and cloud particle data related to pixels that have been co-located to the Lidar track
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
October 10, 2018 3.45 September 1, 2018 to present 3.45 QS (V3) Beta
December 14, 2016 3.40 December 1, 2016 to August 31, 2018 3.40 QS (V3) Beta
August 2013 3.30 March 1, 2013 to present 3.30 QS (V3) Beta
December 2011 3.02 November 1, 2011 to February 28, 2013 3.02 Summary QS (V3) Beta
May 2011 3.01 June 13, 2006 to October 31, 2011 3.01 Summary QS (V3) Beta
October 2008 2.02 September 14, 2008 to present 2.02 Summary   Beta
October 2008 2.01 June 13, 2006 to December 31, 2006
February 18, 2008 to September 13, 2008
2.01 Summary   Beta


IIR Level 2 Swath Data
Half orbit (Night and Day) emissivity and cloud particle data assigned to IIR pixels on a 1 km grid centered on the Lidar track
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
October 10, 2018 3.45 September 1, 2018 to present 3.45 QS (V3) Beta
December 14, 2016 3.40 December 1, 2016 to August 31, 2018 3.40 QS (V3) Beta
August 2013 3.30 March 1, 2013 to November 30, 2016 3.30 QS (V3) Beta
December 2011 3.02 November 1, 2011 to February 28, 2013 3.02 Summary QS (V3) Beta
May 2011 3.01 June 13, 2006 to October 31, 2011 3.01 Summary QS (V3) Beta
October 2008 2.02 September 14, 2008 to present 2.02 Summary   Beta
October 2008 2.01 June 13, 2006 to December 31, 2006
February 18, 2008 to September 13, 2008
2.01 Summary   Beta


Wide Field Camera (WFC) Level 1B Scans Information
Half orbit (Day) geolocated data radiances
Release Date Version Data Date Range Overview of
Quality Statement
Detailed
Quality Statement
Maturity Level
December 2011 3.02 November 1, 2011 to present 3.02 Summary QS 3.01 Validated Stage 1
November 2010 3.01 June 13, 2006 to October 31, 2011 3.01 Summary QS 3.01 Validated Stage 1
December 8, 2006 1.10 June 13, 2006 to present 1.10 Summary QS 1.10 Provisional




NASA
Last Updated: November 09, 2018
Curator: Charles R. Trepte
NASA Official: Charles R. Trepte

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