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Gravitational Lensing Accuracy Testing 2010 (GREAT10) Challenge handbook.

Kitching, Thomas and Amara, Adam and Gill, Mandeep and Harmeling, Stefan and Heymans, Catherine and Massey, Richard and Rowe, Barnaby and Schrabback, Tim and Voigt, Lisa and Balan, Sreekumar and Bernstein, Gary and Bethge, Matthias and Bridle, Sarah and Courbin, Frederic and Gentile, Marc and Heavens, Alan and Hirsch, Michael and Hosseini, Reshad and Kiessling, Alina and Kirk, Donnacha and Kuijken, Konrad and Mandelbaum, Rachel and Moghaddam, Baback and Nurbaeva, Guldariya and Paulin-Henriksson, Stephane and Rassat, Anais and Rhodes, Jason and Schoelkopf, Bernhard and Shawe-Taylor, John and Shmakova, Marina and Taylor, Andy and Velander, Malin and van Waerbeke, Ludovic and Witherick, Dugan and Wittman, David (2011) 'Gravitational Lensing Accuracy Testing 2010 (GREAT10) Challenge handbook.', Annals of applied statistics., 5 (3). pp. 2231-2263.


GRavitational lEnsing Accuracy Testing 2010 (GREAT10) is a public image analysis challenge aimed at the development of algorithms to analyze astronomical images. Specifically, the challenge is to measure varying image distortions in the presence of a variable convolution kernel, pixelization and noise. This is the second in a series of challenges set to the astronomy, computer science and statistics communities, providing a structured environment in which methods can be improved and tested in preparation for planned astronomical surveys. GREAT10 extends upon previous work by introducing variable fields into the challenge. The “Galaxy Challenge” involves the precise measurement of galaxy shape distortions, quantified locally by two parameters called shear, in the presence of a known convolution kernel. Crucially, the convolution kernel and the simulated gravitational lensing shape distortion both now vary as a function of position within the images, as is the case for real data. In addition, we introduce the “Star Challenge” that concerns the reconstruction of a variable convolution kernel, similar to that in a typical astronomical observation. This document details the GREAT10 Challenge for potential participants. Continually updated information is also available from

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Record Created:30 Apr 2015 16:35
Last Modified:01 Jun 2015 10:21

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