2nd European Workshop on Automatic Differentiation

Thursday November 17- Friday November 18, 2005

Whitworth Conference Centre

Cranfield University (Shrivenham Campus)

Defence Academy of the UK

Shrivenham, Swindon

Michael Vossbeck (FastOpt)

Adjoint and Hessian of a Satellite Code Written in C

Abstract:  The radiative transfer model Twostreams by Pinty et al. (2005)  consists of about 300 lines of C code, excluding comments. The inverse model of Twostreams relies on derivative code generated by FastOpt's AD Tool TAC++. The adjoint is provided to a gradient algorithm to retrieve 7 parameters characterising vegetation properties from remotely sensed radiances. The Hessian approximates uncertainties in the estimated parameters. We also briefly report on recent applications of TAF to CFD codes.

Slides: VossbeckNov05.pdf