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Two methods for performing clear-air temperature retrievals from simulated radiances for the Atmospheric Infrared Sounder are investigated. Neural networks are compared with a well-known linear method in which regression is performed after a change of bases. With large channel sets, both methods can rapidly perform clear-air retrievals over a variety of(More)
We present a new technique for the fast computation of near-monochromatic atmospheric trans-mittances in the infrared, utilizing compressed look-up tables, that is well suited for nadir viewing satellite and airplane observations. The algorithm is very simple to use in radiative transfer codes and is easily adapted to provide analytic Jacobians of(More)
An iteration system is a model of parallel computation, in which a state vector is repeatedly updated by a non-deterministically selected set of functions. Such a system converges from an initial state if after some sequence of transitions it thereafter remains in a set of desirable states. We consider both convergence to a xpoint and to a set of values,(More)
Preface This volume is the twelfth annual report describing the scientific accomplishments and status of the Joint Center for Earth Systems Technology (JCET). This Center was established July 1, 1995 to promote close collaboration between scientists at the University of Maryland, Baltimore County (UMBC) and the NASA Goddard Space Flight Center (GSFC) in(More)
The compl exi ty of searchi ng for a mi ni mum cost solution graph of an AND/OR graph i s anal yzed for the cl ass of AND/OR graphs repreaentabl e by a context free grammar with coat functions; finding a mi ni mum coat solution graph i a then equi val ent to fi ndi ng a l owest coat derivation. Several cl asses of search probl ems are defi ned, based on(More)