GDAP Assessments

Guide to Conducting Data Set Quality Assessments

Data Set Quality Assessments: Needs, Benefits, Best Practices and Governance – December 2015

This document addresses the need for systematic assessments of the quality of data sets used in various applications such as climate services and climate science, including their use in the evaluation of climate model performance.

Recent Assessments

Water Vapor Assessment Report – November 2017

Quantifying the state of the art in water vapor products being constructed for climate applications. Find more information at the GEWEX Water Vapor Assessment (GVAP) website.

Chairs: Marc Schröder and Lei Shi


Precipitation Assessment Report – May 2008

Evaluating the reliability of available, global, long-term precipitation data products in depicting the variations of precipitation at larger-than-weather scales with a special emphasis on the GPCP product.

Chairs: Arnold Gruber and Vincenzo Levizzani


Cloud Assessment Report – Nov. 2012

Assessing the reliability of global, long-term cloud data sets. See also the Cloud Assessment website.

Chairs: Claudia Stubenrauch 
(2006 – Present) and 

Stefan Kinne 
(2008 – Present)


Radiative Flux Assessment – Dec. 2012

Providing a forum for consistent analysis of long-term radiative flux products, primarily top-of-atmosphere and surface fluxes, to establish a foundation for better global radiation budget analysis.

Chair: Paul Stackhouse
 (2004 – Present)

Ongoing Assessments

Aerosol Assessment

Assessing the quality and compatibility of global aerosol products with a focus on the Global Aerosol Climatology Project (GACP).

Chairs: Sundar Christopher
 (2008 – Present) and 

Jeffrey Reid
 (2008 – Present)