1. a Geography Department , University of Sheffield
2. b Logica Space and Defence Systems , Downside Park, Cobham, Surrey, United Kingdom
3. c Professor of Physical Geography , University College of Swansea , Swansea, SA2 8PP, United Kingdom
4. d Formerly Senior Lecturer in the University of Sheffield
5. e Senior Research Associate at Ames Research Center , NASA , CA
6. f Maître de recherche in the École des Mines de Paris , Centre de Géostatistique , Fontainebleau, 35 rue St. Honoré, 77305, France
7. g Formerly Senior Principal Scientific Officer at Rothamsted Experimental Station , Hertfordshire, United Kingdom