ChristopherN. H. Doll,^* Jan-Peter Muller,^** Christopher D. Elvidge<sup>***


*</sup>Christopher Doll is a research student reading for his doctorate at University College London (UCL). He did his first degree in geography and mathematics at Royal Holloway, University of London, in 1997, before completing a MSc in remote sensing at UCL in 1998. His address: Department of Geomatic Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom. cdoll@ge.ucl.ac.uk
^**Jan-Peter Muller is professor of image understanding and remote sensing at the Department of Geomatic Engineering, UCL. He did his first degree in physics at Sheffield University, before completing his PhD in planetary meteorology at UCL in 1981. He has a wide variety of research interests and is a NASA Science Team member for MODIS and MISR instruments on the forthcoming EOS-Terra mission. His address: Department of Geomatic Engineering, University College London, Gower Street, London, WC1E 6BT, United Kingdom. jpmuller@ge.ucl.ac.uk
^***Christopher Elvidge works at the Department of Solar Terrestrial Physics at NOAA-NDGC in Boulder, Colorado, USA. He is chiefly responsible for the developing the algorithms for creating the night-time imagery dataset used in this paper. His address: Department of Geomatic Engineering, University College London, Gower Street, London WC1E 6BT, United Kingdom. Solar-Terrestrial Physics Division, NOAA National Geophysical Data Center, 325 Broadway, Boulder, Colorado 80303, USA. cde@ngdc.noaa.gov